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Krokkedil

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Everything posted by Krokkedil

  1. Good Morning. Thank you all for your insights. The house we are buying also has a flatlet that is also running of the 8kw inverter. I will remove the flat from the 8kw inverter and use the 5kw with the lithium batteries for the flat, swimming pool and and borehole pump. The flat will be used as an air B&B to bring in extra income. Other option is to use the 5kw to run the 2 geysers ?? The extra panels will still go to the sunsynk because this will help with the offset of the electricity that we use from EKSDOM I was hoping for a quick and easy way but its seems not.
  2. Hi there. I bought a house with a 8kw Sunsynk inverter and 2 Hubble AM2 batteries and 4kw of solar installed we will be moving somewhere end of May or June I have a 5kw inverter and 2 Lithium Battery SA batteries and 3kw of solar panels that I bought and will be moving with me to the new house, it is currently not permanently installed on the rental property, I use it as a very big UPS with extension cords all over the house I want to connect the 4 Batteries in Parallel to increase my battery capacity. I will also add my 3kw panels to the install. I want to know does anybody know how many cells is in a Hubble AM2 battery?? I Know the Lithium Battery SA has 16 cells. I know the BMS comms will not work correctly therefore I just want to connect all 4 of them to a bus bar. I have 2 Lithium battery SA batteries the one is the old type with the simple display and the second I bought in December and it has the smart BMS and smart display that you can connect to the inverter. It is however not connected because my KODAK inverter cant communicate with it. The old battery also did not have comms and the 2 work 100% together. I do however see a difference in the SOC parameters on the 2 displays and there are definitely a difference in the current that is drawn and charged on the 2 batteries. Both of them will charge to 100% around 11-12 during normal sunny days even though If the app say the charging rate is 15A for instance the new battery will be charging at 6 amp and the old battery at 8 amps. When they discharge the new battery will be the one that gives out more amps during discharge and will show a lower SOC than the old battery. The voltages read exactly the same on both displays. I know that if I try to sell these batteries to buy more AM2 batteries I will not be getting close to what I paid for it. Therefore I want to keep using them. Please give me your thoughts.
  3. Hi there My raspberry Pi packed up and currently do not have Money to buy a new one. Does someone maybe have one that he are willing to sponsor or let go for very cheap. I am am in Brackenfell in cape town and will pay the courier cost.
  4. Hi there Ralph. will you please tell me where you purchased the boards from. I have a inverter that needs a new main board. I live in Cape town as well.
  5. Hi there, No such thing as a dumb question, I had to do exactly the same 2 years ago. had 8 Narada 220AH batteries that was donated to me from another persons house they did not last 2 hours. I then Bought 1 x lithium battery from Lithium batteries SA, the Battery I bought was the 1st version that does not have any comms to the inverter it only has a big trip switch and a voltmeter. I cuurently get between 6-8 hours I have been running it for 2 years and saved about the same price I paid for it in the 2 years, I save average R850pm I am planning to add another Battery and more panels this year if God supplies me with the finances for that, I already got confirmation from Lithium Batteries SA that I can add the newer battery with Comms to my system without any problems.
  6. I have just last week build a circuit that you can use for battery protection. You need to add a starter relay that can carry 100A. Search for TL431 Circuits on google. I could not believe how easy it is to build. All the parts including a 10A relay to drive the 100A starter relay was about R100 I used a small multiturn pot and adjusted it to switch off at 12.2v which is about 60% of an AGM if you run a lithium you can adjust it to where you want it to cut off. I know it is not a Victron battery protector but if you have to build 10 of these you will be able to do it cheap. you can Add a contactor that is driven by the incoming AC the moment the contactor gets incoming AC it pulls in supply the plug with AC when the AC fall away the contactor will open and the NC line can be used to switched the Starter relay connecting the battery. I know this is a nasty way to do this but it works.
  7. The sunsynk is a good option if you plan to feed your extra power back into the grid and it has 2 mppt units The axpert 7,2 also has 2 MPPT converters. In my mind if you are not going to feed back into the grid this is the one to choose. The kodak which I have has only one MPPT, this is a problem when you strings pointing in different directions because of roof space. When the one string has shadow it pulls the other string down. If you have 2 MPPT trackers it makes your design more flexible.
  8. You are on the right track. I have never seen my 5kw inverter at 5kw, I dont know why a person will have lets say the tumble dryer and a geyser on at the same time. I used to have a 3kva inverter and that was too small when the maid wanted to Iron With the 5kw i had the tumble dryer on and she irons and i turned on the kettle and it maxed out at 4,7kw for the time while the kettle was boiling. then it shot down again and the iron turns on for small amounts of time less than one minute when it is hot. The thing is we all look at worst case scenario and speck our system according to this but usually under normal conditions the inverter sits at idle at about 300-500w
  9. 1. Are you planning to feed back into the grid? then yes Sunsynk 2. if you do not plan to feed back the luxpower with its 2 MPPT units 3. The pylontechs are good but there are batteries that work very well, i use the Lithium battery SA unit and it works very well 4. like the people said do not use panels that can deliver 18A if your MPPT can use maximum 11 Amp. Hope You have a marvelous time designing and building your system.
  10. Morning All. The speck sheet for these units say max charging is 80 A from solar, My question is what is the maximum ISC that these MPPTs can handle? I want to add another string but dont want to purchase say 590w pammels with an ISC of 18A if the MPPT can only really use 10A The unit can take 5000w of panels i was thinking 5000/450 = 11.11A Please tell me if I am correct.
  11. I have a MECER 3kva 2400w 48V inverter that stopped working, Mecer want to replace the complete main board. I think the MPPT is dead. It is free to somebody who wants it for spares, You pay the courier cost. contact me on ZERO EIGHT 2 Eight 78 3 Eight 39
  12. As per mzezman's post if you get the correct inverter you do not need a battery, If you want to have redundancy when eksdom bombs out batteries must be included. or if you want to save money batteries can be used to reduce your utility bill. Adding a battery does however increase your ROI and it will take longer to recuperate by the time the system is paid you will probably need a new battery. The thing with any solar installation is that you do it to try and safe money but it does not guarantee that you will safe money. there is always maintenance that has to be done,
  13. RGB, it will give you 600w more RGB is probably the worst thing to gave on an inverter because who wants a inverter that is looking like a disco in the middle of the night. I believe that an inverter should be silent and dark and do the job.
  14. 1. what is the VOC of the panels? 2. the 5kw can handle 6500w max , you have more than 8kw of panels if you use a 205 loss you are just within the limits. If you have a cold day you might exceed the max if the panels VOC is 45v then use 2 strings of 10 per MPPT that gives you 6700w and should be save.
  15. Please read the post above, it tells exactly what the problem is. The Diodes are blocking any current flow in reverse that causes the trip. After some research, it was proven that some pannels might be causing this to happen because the of water ingress during rain.
  16. 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.
  17. Hi there, I am using 2 diodes 1000v 25 amp the type you screw onto heatsinks or stud mount as they are called. My panels are 330w with around 9,5A open circuit amps 6 in series the 25A diodes should be big enough. They are placed in series with the panels before the circuit breakers.
  18. When it rains and there is leakage to earth from some types of panels, all sorts of problems can occur, e.g. the DC bus voltage can become too high, resulting in a fault code. There could also be tripping of earth leakage devices. I had this problem and did ask for help with this, but got now reply. I have installed 2x 25A blocking diodes in between the panels and the fuses and the problem is gone. I was wondering if the MOV's are not the same as installing surge protectors on the DC line, I think the surge protectors has MOV's in them.??
  19. Andy on my system the voltage rises and then stay constant with a couple of volts up and down then drops again at night. The amps vary a lot. Like Tariq commented the Vmp is what will be measured by the inverter. The VOC is the maximums that will be achieved with no load, You will get a lower voltage when the panels is connected
  20. Good morning. 1. what Equipment. Inverter DEYE 5kw x 2 Battery Lithium batteries SA 5,1kw X4 Solar panels as big as you can afford. 2. Start off by purchasing 1 inverter and 1 battery total cost around R40k, Install this properly on your essentials, 3. Purchase enough panels to fill up one MPPT on the Deye. 3500watt 4. Purchase enough Panels to fill up the second MPPT on the Deye. 3500watt 5. Save and purchase your second Deye and second battery. 6. follow steps 3 and 4 7. Purchase more batteries. Switch eskom off. If you have a borehole get yourself a tank as well as a proper filter system and pressure pump and reduce your water usage as well.
  21. Good Morning and welcome to the forum. The Deye inverters support 500v max per MPPT. To be save never exceed 450v per MPPT. I am not a guru but looking at your figures you should be fine
  22. Good morning. I have a 5kw Kodak inverter with 12 solar panels 6p2s. The 2 sets are on different parts of the roof. one set of 6 panels is north facing on a tiled roof, second set is west facing on a corrugated metal roof. The reason for having 6 panels facing west is I stay in Cape Town and we have sun until very late in the summer. During summer months we hardly use eskom power. Both sets have individual cables running into the house and have their own breakers on each cable. The set that is on the metallic roof trips the earth leakage when it rains or when we have a lot of moisture in the air. I checked and cant find any place where the wiring is damaged. The strangest thing is it only happens when the inverter has Switched the solar panels off and don't draw power from it at night or when it is heavily overcast. If I isolate that set by turning the breaker off then it does not happen. Yesterday I measured and I have about 400v between the panel wires and the earth while the system is running, my plan was to ground the negative of the solar panels but after measuring this voltage I think that will be a bad idea. Will it help if I install blocking diodes in line with the cables?? Will the gurus please help me with resolving this. there must be some kind of earth loop happening when the mppt switches off but I don't know how to fix this.
  23. Mecer does have a repair center in cape town buy unfortunately they will not do board repairs but replace the full board. This will cost you more than a new inverter. there is a company called setsolar that does repair, i have not tried them yet
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