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  1. Version 3.10

    365 downloads

    Reading live data from Goodwe ES Power Inverters from Local Area Network for Windows XP, 7, 8.1 and 10. Shows data sent by UDP packets. Installation instructions inside the .zip file. Please comment on any errors found. Any suggestion is welcome. Version 1.0: November 7, 2020 Version 2.0: January 22, 2021 Version 3.0: May 16, 2021 Youtube short video In Operation: Version 1.0.
    6 points
  2. Leshen

    Sunsynk/Hubble Install

    Two x 8kw Sunsynk Hybrid Inverters with 4 x Hubble AM2 with 36 x 535w JA Solar panels.
    5 points
  3. 5 points
  4. It's a whole can of worms to grid feed at this current point in time. Electricity capacity crisis in SA aside. The costs to feed in far outweigh the money recovered to feed in. Firstly, a new meter that allows such a practice. Yes, that will set you back a monthly fee of R500pm. So let's think about this carefully. You starting on a R500pm deficit. Then after your production has exceeded this threshold you actually start to get credit. In my opinion it hasnt worked in places like the UK or AUS. We are light years away from those peoples rational politics or thought. Don't see it working here anytime soon. Yes, Hansa lots of energy that we could feed in but unfortunately it's not going to be a reality anytime soon. One of the many reasons that I don't like to pay for kit that I will never use, like the Sunsynks & Deye inverters. Honestly, great machines but you are paying for magic tricks that you will never get to practice at the circus. Eskom will not allow it period, unless you have money to burn & your equipment is used at max capacity at your own expense. If only we could make use of the potential The best use of that spare energy is in battery storage. Costs a lot of $$$ but at least it belongs to you & is useful. Also you get off their irregular supply. 87
    3 points
  5. anonbeat

    Presentation

    Hi, Im really new in solar. I have 1 Axpert 7.2kw inverter connected to 2 7x550W Mono Perc panels. Waiting for the batteries to arrive and hoping that everything roons smooth. My next step will be collect all data from the inverter, bms, shunt, etc and dump it into a Influxdb with a ESP32 or if not working fine with a raspberry. I hope I can get it. Just noticed some good stuff in this form and I hope I can learn from all you. Thanks for that.
    3 points
  6. On this forum, people often substitute "hybrid" with "bi-directional" and confuses everyone. Of course, the Growatt is a hybrid inverter! However, it's not a bi-directional as some other brands, therefore it cannot push to the grid side to supplement the non-essential loads or feed to the grid.
    3 points
  7. Each battery keeps it's own cycle count. I have three Pylontechs and they all have different cycle counts as they were installed at different times. There is no issue to adding a new battery to the bank, as long as you make it the master in the bank.
    3 points
  8. Hello everyone, New homeowner here, which inadvertently made me the new owner of a massive solar installation as well (well, massive in my opinion). We really bought our property for the peaceful backyard, and also for all the extra's the omie added over the years because he could This includes, the solar array generation plant! After I have started reading into solar, this whole world quickly blew up into a VERY complicated maze to navigate with so many nuances. So I did what any other person would, started Googling and trying to understand as far as possible. I am not a technical guy, but my job lends me to understand difficult concepts that I am unfamiliar with - so I'm taking this as a challenge. Loadshedding, funny enough, isn't a big deal (during COVID) in our neighbourhood due to us being close to a testing site which means we haven't had any the last year. That being said, with the state of my battery bank, I really don't know how long it would last me until SOC is achieved? I would ensure geyser + all major loads will be pulled from the equation if that ever happens (really just evenings as PV is strong and I operate off-grid in the day). My aim: Stabilisation of settings on inverters Getting the most out of my PV panels Not a lot that can be done here. Just hosed and wiped them down recently for the dirt layer. Removed 2 palms that was causing lots of shade on two major sets of panels 9am in the morning! Not sure why the omie didn't remove them after spending so much money Preventing further deterioration of the bad battery bank (EXPENSIVE to just throw money on it currently) Implementing a way to monitor my installation wirelessly (I like tech, and I like comfort in stead of walking to my garage every couple of hours). From what I can gather, a RsbPi + the ICC software will do the trick? Is this expensive? So what does this little installation have to offer on a 200sqm house? Let me oblige: 3 x RCT (Axpert) MKS-MKS+ 1-5KVA (15 kW) "hybrid" inverters, with two spares! 40 x Shoto 100AH battery bank -- already 3/4 years old and already giving issues (more on this below) 36 x (yes you read right) ILB HELIOS 255W solar panels On current readings, around 12:30 I get from the best placed sets (2 x 12 panels) 2.1kW and 1.9kW respectively. The other set around 1.6kW. So power throughout the day if properly managed, is totally off-grid. My wife, myself and the little guy depending on our wellfare are people that don't consume energy indulgently. Some house background to give context: All lights fitted with LED 3w/5w My dad helped recently install a nifty new CBI Wifi timer on the geyser so that we can shift the load on our very normal 3kw 200L geyser. Heats up fully between 10 and 12 and then a top-up at 14:30....that's it! Working like a charm. Basic fibre, router and access point tech running 24/7. Cooking (oven and ceramic top) only used really from 4-6pm. Kettle throughout the day. Alarm and electric fence running 24/7 Built in fridge and freezer that are 10-15 years old, so they are more power hungry (planning on ripping them out and using my more efficient Defy's) Dishwasher, washing machine and dryer is used throughout the day, preferably not in unison and not while the geyser is on. Load management Borehole + pressure pump that only operates for the garden when irrigation system is on (planning to change this so that the house can use the water as well). Inverter settings rundown - firmware 72.4: 1 SOL 13 54V 2 70A 16 OSO 3 APL 23 byd 4 SdS 25 FdS 5 AGn 26 56,4V 6 Lf(?)E 27 54V 7 tfE 28 PAL 9 50Hz 29 42V 11 30A 30 ONE 12 46V 31 SbE Batteries: Currently no fancy BMS and yes, I do know this is vital to prevent the current situation of how the battery bank looks. Relying solely on manual voltage readings which already have produced worrying results. I did a reading 5am in the morning when they were discharged to their managed SOC % to get an idea of the struggling ones: There are 10 batteries below 11V readings (10.xx V all of them) There are 2 batteries between 11-12V Last battery in the bank is 8.46V! > My dad, with more knowledge than me on anything electrical, suggested we use a battery charger on the struggling batteries first to bring the bank more into unison, voltage wise. Acknowledged that there are definitive bad eggs which is influencing the whole bank which we might need to pull out, 4 at a time. > Will be applying the manual approach for now to identify those which we need to remove. That is the approach currently, which we know isn't the ideal one. Any better ideas? > Acknowledged, the best thing in the future will be to replace this whole bank with Lithium sets that have proper BMS in place. Just no there with finances, unfortunately. In conclusion: My needs are simple and currently being fulfilled by this massive installation, especially throughout the day. That being said, I would really like to preserve and ensure longevity on this due to the fact that so much money has been spent on this. That being said, I do not plan on investing massive amounts of money currently on this system (just bough a house, remember). I tend to type books, so for those that made it to here, thank you and I do appreciate your time and knowledge!
    3 points
  9. Just have a think, ICE cars and power generation Lets have a proper look at the SA scenario for the future, regarding ICE cars and EVs and the outlook for power generation. So why look at this you may ask? Easy answer, this is not. My distinctly charcoal grey Crystal ball is a bit foggy about the future. One thing thou is that the Legal framework and idiotic ideology in SA will not change anytime soon. The fraud, graft and ineptitude of the Cleptocracy will snowball if any of the current proposals for bee and other new legislation (or just look at the Powership story) are anything to go by. Now, I hate being negative, but all the years gone by has proof in and of itself, this is barreling along. I am a realist, just for the record. But back to ICE cars end Escam. Worldwide, many counties enacted new legislation, or are about to, to either ban ICE cars or pivot manufacturing to alternative technologies like BEV’s. Lets unpack. In less than 10 years, the production of ICE cars will plummet by a significant %. When that materialises, SA’s exports will be affected as Japan and Europe will want to keep employing their own people, so guess where factories will be closed first? Also a consequence of less demand for ICE cars will be less development for new models and a reduction of parts produced for maintenance. As electronics are updated, older chips and systems will no longer be available to manufacture the computers for older generation cars. The end game will be for ICE car manufacturing to collapse due to unavailability of parts as well as the cost to build the low volumes, making them very expensive. What will happen to industrial machines and other heavy equipment, maybe they pivot to electricity as well. There are numerous very large (100 tonne and larger) mining trucks that are electric powered or assisted, already. Diesel electric trains can all be converted to electric only. We currently have Gautrain that is electric only. The first electric ships and planes are currently being tested. Here is the rub. When ICE dies, not if, Africa will have a problem. In 2008 there was the joke about what comes after electricity for SA, and its candlepower…. With SA on a downward trend in Eskom and no relief from policy or ideology, there will be no power to support BEV’s, let alone the population at large. We have frequent shortages as it is. In the below picture, Red represents the occurrence of unplanned outages, hint, its a trend… Green trends downwards and is another trend. Over time, less and less generating capacity remains online and available. Not green is NOT good. Percentages of populations with a grid connection as well as how available or reliable that is. If its not available, it translates to loads being shed or no energy been available for those clients, or worse none at all. It looks like there are huge changes coming, with many forms of disruptions to boot. Look at industries like IT, based on silicon (just look what computers did to cars, both as controller and optimisers of combustion as well as to the design and aerodynamics via CFD, to name a few, there are many more). Energy from Solar PV (also based mostly on silicon and benefitting from the IT technology pure silicon gains and developments) now being the least expensive energy generation tech, Transportation and Space travel with the possibility of living elsewhere, however far fetched it is today. Another big technology being disrupted is that of energy storage. We never before a short few years ago, had the means of Utility class energy storage. Now look at the Gigawatt en recently Terawatt hours battery storage systems. 5 years ago, Utility scale battery storage was not a thing, now it is. And it is cheap and getting cheaper at a very fast rate. Studies show that soon if not already, Solar PV and Battery storage systems will be less expensive to build, compared to traditional systems like Coal or Nuclear, and be far less costly to maintain. Think about superconducting materials and the revolution that has happened there and in materials science in general. Now look at the latest materials technology in Carbon Nano materials. Currently the best known heat and electric conductor known. And the Carbon Nano materials are only now coming online for production use. Now, to prove the point of rapid development and disruption, smartphones are barely more than 10 years old, and see what they have done and disrupted and how quickly, just look at Twitter, Facebook and Google…. And remember when the Telephone was invented, how long did that took in comparison, to disrupt the market compared to smartphones that was doing so much faster. Another example is the car itself, it disrupted horse drawn vehicles and replaced then is just more than 10 year during the beginning of the 1900s. A few pointers on the cost reduction of disruption. IT and Moor’s law, a doubling of transistor count every 18 months. Storage increase of about 50% capacity per year or if you like a density increase for same cost or the cost for same storage capacity halves. Look at battery cost reducing by 20% per year and almost the same for Solar PV panels. In total Solar PV costs reduced 400X since the 1970s already, and it keeps on falling. Networking and digital sensors are being transformed nearly as fast or faster with associated cost reductions per unit. Where does this leave us on the African continent? In 20 to 30 years for us, there is a high probability that ICE cars and motorcycles will be utterly unaffordable if not completely unavailable. At the current trend of not properly maintaining the Coal fired generators, there will no longer be cheap or reliable energy available, if the ideology does not change. The prospects of this and the next generation changing their ideological outlook is slim to none, bar a catastrophic intervention. There is talk of Solar and Wind but I hear noting about storage and to boot, there are currently Zero and Nil Utility scale batteries connected to the grid in Africa. Calculations show that with Current technology, we need Solar PV sizing to be 4x larger than demand and just enough battery storage to cater for between 2 and 4 days worth of demand. With these ratios, we can replace base load generating stations. Imagine the efficiency and the astronomical cost savings. Oh wait, I just remembered, its not about cost savings here, its about contracts awarded to bee buddies at max value and max overrun…. Let’s remember that during the early 1900, the World suffered through an influenza pandemic, not unlike the current one. Not even that or a World war cold stop the Car disruption and transformation. Now today, think how much less you are driving due to the pandemic and why? Other technologies referred to above are aiding and abetting that your personal transportation is less of a requirement, yes even in SA, and more of a luxury. You work online, shop online, chat online etc etc. In summary then, this is just scratching the surface. The IT revolution led to the Energy revolution that includes Solar PV and Battery storage. This will cause in short order, the total decline of ICE cars to be replaced by far cheaper BEV cars. The maintenance on tases BEVs are about a 1/4 of that for ICE cars. This will leave us with a transport issue and shortage of cars since we do not have and are not planning for BEVs nor for a proper legal framework for energy generation to support BEVs. What to do, any ideas or comments? How to solve this or just how to deal with this? Let’s remember that everything is devolving from centralised to decentralised, for example the mainframe to mobile devices, banks to online banking services. Travel by car and plane to online meetings, from shopping malls to online purchases and delivery from warehouses. Nobody owns the internet and it’s distributed everywhere. The same is busy happening to transport and energy and soon food, Worldwide. It’s inevitable that these trends will hit us hard…. Sooner rather than later.
    2 points
  10. JAOG

    Hello everyone.

    Unfortunately not yet too broad in SA although we are getting there. Specifically PV solar, storage and integration.
    2 points
  11. I have started a list of solar power scammers: http://www.solarzonersa.co.za http://www.solarenergysuppliers.co.za/ https://solarenergyzone.co.za/ https://suncycle.co.za/
    2 points
  12. I'm not sure how much difference the extra 5% makes on reducing battery life over a 10 year period, go to battery view and read all the info, its really good. Their view is probably based on a purely scientific basis, so it might not be practical to only charge to 95%. Your BMS should prevent stressing etc but who knows, the battery and BMS technology changes so quickly maybe the newer BMS's don't stress the batteries. My BMS takes the battery to 100% but then discharges it to 90% every day so its never kept at 100% for an extended period. If you feel it will make a difference then make it 98% for e.g, just not 100%.
    2 points
  13. Running this way for the last 14 months, the SOH is sitting at 98% ( as shown on the bms )
    2 points
  14. I would say that it is checked out now as compared to a new inverter, so maybe not a bad idea to accept the fixed inverter, just my opinion.
    2 points
  15. i have a 4.8 kWh battery, which I run down to 20-25 % every night, "usually"load shedding is announced, so IF the SOC is low and there is no pv, i charge the batteries from the grid, the only time I got caught flat footed was on a stormy morning, with batteries at 20 % SOC and then we had a power outage, so had to shut down the inverter, so, yes, I don't cater for EVERY situation, but I am getting the most bang for the buck from my batteries. I have a 6.4 kWp array and run all my major loads during the day, only have 250-450 watt loads at night.
    2 points
  16. grant.cpt

    Shoutout!

    Hi All, I just want to give @Sarel Seekat a huge shoutout for his assistance with my current set up. Gotta say, he knows his sh!t. Also, he designed a super sleek app/integration for the Inverter and Battery. And if you're someone who likes data and graphs - it will blow you away!
    2 points
  17. Side note to your side note. V=I x R When referring to losses the typical formula use is P = V x I , replace the V with I x R then you get P = (I x R ) x I P = I2 R The energy is lost in the form of heat due to the resistance of that cable and current flowing trough it. The formula P = V x I for losses does not make that relationship evident. Whereas with P = I2 x R , you can clearly see for an increase in resistance there is an increase in Power losses, but even worse in the increase in current where the relationship is a square. That's why a 48 V system is way more efficient than a 24 V system . Although current of a 48 V is only 1/2 of the current of comparable 24 V system , the losses across the cables is 1/4 less. __________ As for the OP , in a single inverter , single battery bank system the difference in length between the positive and negative cable are irrelevant as is a simple series circuit and Kirschoff`s 2nd Law applies. Obviously when a parallel inverter or parallel battery bank is connected this does not hold true anymore.
    2 points
  18. Effectively the availability as a % of total generating capacity. Over the years the total capacity that can be used to generate power are declining (green). Think of this as units in the fleet that are broken and never repaired, so they are still part of the original capacity but no longer capable of generation. The red line is units down (% of total units) that are down due to being broken and not taken down for maintenance or planned ahead of time.
    2 points
  19. That’s the reason I asked if it’s a COCT regulation. Currently SANS 10142 doesn’t cover Solar. If someone can show me the SANS regs which covers Solar then I stand corrected.
    2 points
  20. That’s very coincidental. My 10KW system also charges the batteries by 12 noon and after that we desperately try to use the excess power washing and drying clothes plus running a split AC in the bedroom all day. I still see that about 33% of the power still goes to waste.
    2 points
  21. On PV wiring and isolation…. For my PC system, I am using Noarc DC 1000V breakers. This is certified for both Isolation and as a circuit breaker (replacing fuses) for DC. Coupled with this there is a Class 1+2 Surge and lightning protector. After that there is a fuse to protect the downstream wiring and equipment, but only in the + side. One thing I dislike is using fuses for disconnecting the PV side. Isolators are designed for that purpose, not fuses. The DC breaker protects from any mishaps upstream. The code is actually bassacwards in my opinion, in that there is “no required fuses at the panels” to protect downstream cable shorts. Two of my 3 strings will have 700V and the 3rd one 150V. This is high voltages and the energy from a spark or short will be something to behold.
    2 points
  22. In all fairness the supplier will have to investigate and make sure the equipment was not abused/installed incorrectly before replacing it. I imagine this takes time but they should have at least communicated the process and timelines involved. One hopes Sunsync has that capability in SA. The process should be published and available to all end-users for following up on issues. I had the same issue with another brand, 3 weeks later I got the replacement, BUT I did chase, follow up, send emails etc....
    2 points
  23. It's not often that one hears about this, but that does not mean that it doesn't happen, it's an electronic device and can happen with any manufacturer, despite quality controls being in place. Key to this is how effectively the installer and supplier manages the replacement / repair. It's a scenario that many of us don't envision, and that's why it is so important to buy from a reputable source, like the Powerforumstore. My own 5K Sunsynk has now been operating without skipping a beat for over 12 months now, day in and day out. @EugeneN I sincerely hope that your situation gets rectified ASAP, please keep us informed on the progress?
    2 points
  24. Lightly patched firmware version 71.97a for Axpert Kings (not Axpert King II), both LFP and non-LFP flavours, have been released. There is also extremely lightly patched display firmware version 20.66a, which displays the DSP firmware version properly (and no other changes or features so far). Beta Version of Patched Firmware 71.97a / 02.66a for PIP-5048MK/Axpert King 5K .
    2 points
  25. @YellowTapemeasure the non essential loads just don't work, the plugs/circuits are dead. And nothing trips. I might have found the problem, it seems that the prepaid meter(Conlog) is 'tripping' for like a minute, no errors on the meter though. I have turned up the 'Zero Export Power' from 20w to 200w and so far no issues. If this works ill incrementally drop this to the minimum(provided this works of course)...
    2 points
  26. Sc00bs

    2kW geyser on 16A Sonoff

    I use these 72A Ewelink Breakers that are Sonoff compatible and run 3kw load through them without any issues. They also measure the current and you can set min/max current, power and voltage cutouts. They integrate with Home Assistant using the Sonoff Lan plugin without any issues. They are not flashable with Tasmota as far as I am aware. You can buy them either at Banggood Link or locally from the Robofactory Link
    2 points
  27. When the bootlaces are unused they are round, just like the wire. Smaller sizes are crimped with a bootlace tool and end up being about square (or 6 sided hexagons depending on the crimping tool dies) after crimping. Larger sizes are normally crimped with a hydraulic or electric tool, they normally end up being hexagon shaped.
    2 points
  28. Yes, for the first week you spend a lot of time monitoring it, 2nd week less so, third week even less as you start to trust the system and gain a better understanding of it. After 1 year, I still check what mine is doing around 3x per day (more or less), using the Solarman web-based app in a browser.
    2 points
  29. I'm glad you are now utilizing your battery. Your understanding of the power column is correct. If you exceed that value, it will pull the remainder from the grid. I don't know what will happen if grid is down though whether it trips or just gives off an alarm.
    2 points
  30. As with beer... or ammunition... you simply can't ever have enough. I have a 'spare' two strings on a separate inverter (on a manual breaker) adding an additional 4Kw into my home system just for those inclement days. Consequently I have never needed to supplement with the standby generator.
    2 points
  31. Hello Jaco, welcome to the Powerforum and congrats on your first post! Running a whole home is a bit of a lofty goal, and 3kVA is generally a bit smallish for a house (not impossible though), but maybe your needs are small too: What is your daily consumption (kWh)? Even if you cannot run the whole home, it's good to understand what you potentially can do, planning for optimising your investment can be fun. So for starters, let's determine the maximum energy that your inverter can generate. For that we will need to understand the Synapse 3k inverter's capabilities. What is the MPPT controller's specs? It's usually in the manual (or sometimes on a sticker on the side or bottom of the inverter)
    2 points
  32. The system mode screen centres around the loads, and uses battery SoC. Thus A timer band set to 50%, AND: If the battery is below 50%,: The inverter will charge the battery to 50% (from solar) AND if there is excess solar power, it will continue to charge the battery (to full if there is enough solar), regardless of SoC AND It will also service loads. Battery charge / Load priority is dependent on the "Priority loads" tickbox If loads exceed solar power, it will draw additional energy from Grid / Gen. If Grid or Gen is ticked, it will use Solar / Grid / Gen or a combination to charge the battery and service loads. Battery charge / Load priority is dependent on the "Priority loads" tickbox. If the battery is above 50%: It ignores Grid / Gen ticks; and The inverter will use battery to service loads, (in preference to Grid / Gen) until 50% is reached, after which then it will use Grid / Gen to service loads.
    2 points
  33. Morning All (again), So here is what I think I am going to start out with MdF
    2 points
  34. The only 'problem' i see here is that the inverter will use the grid between 8am and 3pm as long as the batteries are not fully charged. I prefer supplementing solar with batteries during the day to ensure that i don't pull from the grid during the day.
    2 points
  35. I'm pretty sure the firmware for the TL and ES are very different as they are totally different types. TL can be found here: https://drive.google.com/drive/folders/12ttv9oCoC2rowUPDdsjfs0P4fz9DuSVt
    2 points
  36. Taygs

    My Home setup

    10x 370w ArtSolar panels
    2 points
  37. The reason why I asked is because It depends on how it is set up. If it's servicing load and charging batteries simultaneously, your draw could theoretically exceed 8K, which isn't going to be possible with a 5k genny.
    2 points
  38. What batteries do you have? Different batteries types have different requirements.
    2 points
  39. There is some very poor advise above re batteries, I would also stay well away from Growatt inverters. We have a plus 10% failure rate on the Growatt units. For a 3ph solution I would recommend the Sunsynk or Deye 12kW units.
    2 points
  40. Erastus

    4 Kwatt wind generator

    The inlet out let and vacuum meter with valve control to keep the jar under a negative pressure.
    2 points
  41. @Coulomb I think the product manufacturers should provide some half decent functional schematic block diagrams of their inverters transfer functions. That includes most types, not limited to voltronic. Specifications are also only bare minimum. While I perfectly understand that the machines are consumer grade , the functionality of modern inverter is not trivial. Fortunately , in this regards, we have forums and enthusiasts like you. Cheers.
    2 points
  42. Your title is confusing, because it combines energy and power. But your questions seem to relate to power. It depends on the model, but an Axpert MKS III 5K-48 for example can transfer up to 40 A from AC-in to AC-out. That's about 9 kVA. The headline 5 kW rating is for battery and/or solar to AC-out, the basic inverting process. When power blending in an MKS III, AC-in is connected to AC-out, so the above applies. When utility charging, some of the 40 A input current limit is diverted to charging the battery. So if charging the battery at say 1.5 kW, there would be some 7.5 kVA left over for the loads.
    2 points
  43. Just replaced my Axpert with the Sunsynk 5.5 situated in my garage, It is powered up and everything seems to work first time, still a bit of reading and experimenting to do with settings and WiFi dongle that I need to figure out but “WOW” what a machine. Everything about it feels and look like quality. It was quite easy to fit as most of my wiring was already in place except for the CT coil wiring that was a bit of a mission because my grid main cable is about 20 meters away from the inverter and I had to extend the CT coil wires to reach all that way and than changing my PV panels from parallel strings to series. Than fitting the earth bond relay easily inside the inverter, Also my DB in the house was previously upgraded and split into three sections when I first installed the previous Axpert. I did’nt use the PV string connectors on the bottom of the inverter but rather entered the PV wires through a sprag pipe in bottom of inverter.
    2 points
  44. I have resolved this by installing 2 stud mount diodes of 25A in series with the string before the circuit breakers. I hope this might help someone else.
    2 points
  45. Firstly, a deal with the block next door is going to fall foul of the law. OK, maybe you want to take the position that it's only a problem if you get caught. But also what happens when the occupants of one block decide that it's the guys next door who are using more than their fair share of the juice? Many years ago I lived in a rent controlled flat. The owner of the block used to get a bill for the whole building and split that across all the flats (each flat had their own submeter, but these weren't read). There was unhappiness because it was known that in one flat a lot of baking was going on. In another the occupant left all his lights burning all the time. I was in one of two bachelor flats in the building, why was I paying the same as a person with a 2 bedroom flat with 3 people living it? Etc etc. The landlady soon had a fight on her hands. Muggins here volunteered to read the sub meters. After all, it's not rocket science. I soon had neighbours pounding on my door demanding that their be re-read NOW! They can't possibly be using that much etc etc So I think even doing it for one building, the body corporate is making a stick for their own back. How do they track who got the biggest bonus from the system, because it's a dead cert that not everybody has the same loads. Tenant jharber might be careful with his usage, keeps his geyser under control, and is generally thrifty. Meanwhile tenant bobster keeps tropical fish for a hobby, which means a heated tank. Oh and he has a couple of spotlights trained on that tank so the fish can be seen at their best. And he likes his electric blanket, and his wife is baking all day long because she sells at the tuisnywerheid to make some extra. And boy does that microwave oven ping all day! And then you get loadshedding, and the one or two bobsters in the building soon deplete the battery and then nobody has anything. Sorry to be a bucket of cold water, but I think there are lots of problems looming on the body corporate's horizon. You could put meters on the feed to each flat, but even then what are you going to do? Tenant bobster really likes his tropical fish. Without those fish, life has no meaning. He's not draining the batteries deliberately, but what would you have him do? Poor piranhas... they have a right to a comfortable life, don't they? Heaven forbid that somebody gets an EV and charges it every night.
    2 points
  46. My last limited contribution to this thread before being told by the author I have nothing sensible to say To answer the question: No, lengths don't have to be the same. Deep in the same manual the below is stated about resistance. So horses for courses here gentleman & ladies. I would also add with the tiniest pitch of salt. Nobody here is getting paid to provide your answers to your question. It's on a public forum & it's not a subscription required to answer. Let's all be free on this forum to post & contribute. By telling people: read the question & if they haven't nothing valuable to add is a tad harsh. Because so many times the wrong information can lead you to the correct information, so I for one actually enjoy every person's contribution right or wrong. I learn from either. 87
    2 points
  47. At the same time realized yesterday a simple characteristic of AC , that is , because of alternating current flow , we cannot detect the direction of power flow without calculating the vector relationship between current and voltage. Damn , this solar thing is getting complicated . But to see the sun operating my pool pump , whilst my middle finger is pointing towards Escom HQ , makes all effort worth it !!!
    2 points
  48. ALL 69 PAGES? Agreed that it's good doc, but that's why The Powerforum exists, ain't nobody got no time for that.
    2 points
  49. The goal is for both parallel paths forming the main terminals to have the same series resistance. If they don't, the load won't be distributed evenly between the batteries. The Victron pic is showing this exact fact. The shortest possible wiring to your inverter for sure. Otherwise losses. The losses are your responsibility. How much of it you accept is your problem. Does this affect how the battery will discharge? No, they will discharge in a balanced way. You won't find an official document about this because it's a well taken for granted scientific fact. You set this up & play around with it & the results will be revealed. The same is true about so many things Solar. The proof is in the eating of the pudding. The idea is to ask as many bakers as possible & decide for yourself based on good judgement. 87
    2 points
  50. I have connected my Sunsynk auxilliary ourput to heat up my geyser as soon as the batteries are full and the PVs are generating more than 400W. This helps a great deal with idle time and keeps my geyser nice and hot. The same can be done with aircons on the grid side, if your Inverter can handle it. I have installed an 8KVa which can handle the amps easily.
    2 points
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