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Shortcircuit

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  1. I agree, a response from Sunsynk would be great. I have emailed them directly and they requested photos of my config. I sent them the ones attached to this post but since then - nothing. I read the comments about the CT coil in your post but I have replaced the CT coil completely (with the spare that I have from the Slave unit) but it did not help. A bit stumped as irrespective of the settings, the unit continues to export power randomly which results in the meter tripping. My problem also first surfaced when the batteries reached 100% charge and I then set the Grid Trickle Feed to 100W (up from 40W) but to no avail. The trickle feed from the grid just varies around between randomly between 128W and -150W as it wishes. It seems that the control is nonexistent. I see that the comments against your post seem to have missed the point of your post and tend to focus on everything else in your settings except the Grid Trickle Feed.
  2. I have two 5,5kVA Synsynks installed in master/slave configuration with SolarMD batteries. The systems have been running for over 170 days and up until mid October ran without a hiccup. In October the firmware was upgraded over the air (by Sunsynk) from e417 to e419 MCU3366. Since the upgrade I have noted that the units will not draw the set minimum power from the grid and this randomly changes from positive to negative and occasionally the prepaid meter (Conlog BEC23) trips. There is nothing connected to the Grid input after the CT coil. All load is connected to the UPS output. Nothing is connected to the Aux/Generator input. The Sunsynk also shows random amounts of power being fed to the Grid input before the CT coil although there is nothing there that can consume power. Does anyone have any suggestions on what could have gone wrong?
  3. Thanks, I've posted the question so I'll see what Keith says
  4. Good day, Looking for help on the attached planned install. I think that I have everything puzzled out except for the comms between the batteries and the Sunsynks. An extract from Sunsynk's Instructions are: (See https://www.sunsynk.org/post/copy-of-paralleling-inverters?postId=60857b09ac8dee0015cf260d for the full post.) 3) You only need one CT coil per master. 4) Only the master can communicate with the battery array. However, suppose you are using more batteries than the number allowable for the inverter. In that case, the other batteries can be connected to the other inverters set to voltage only, and therefore there is no need for communication. This is one statement that confuses me 5) If the inverters are connected to the communication of the same battery array, the master will control the charges in the other inverters. And then the following: In theory, you can connect up to 16 inverters on a single-phase configuration, but be very careful about inrush current when switching on. You may need to add an additional contactor. The single-phase configuration only requires one master, and all the others are slaves. In addition, keep communication cable as short as possible. Check if all inverters have the same operating system and the latest software version and are the same model. On the multi-inverter page, select 'parallel' and choose the master, which is normally the central inverter. Ensure that you have good quality communication cable between the inverters. Set all the other inverters to be slaves. Each inverter needs its own unique MODBUS number. Each inverter needs its own data logger. You only need one CT coil, which is connected to the master. All batteries are wired in parallel. The master is the only one that communicates with the battery BMS. This is another confusing statement as they should all be on one CAN bus with different addresses. After checking and setting all this, you are good to go. As previously mentioned, the most common fault is a communication error between the inverters. Please study the previous Section 7 of this training manual. Can anyone offer advice on the CAN bus interconnection between the Inverters and the V2Logger. Do I simple connect the two CAN buses together or what? Any other comments on the proposal will also be welcome as I am new to Sunsynk but have been using Axperts for years with and without solar. Sunsynk Installation.pdf
  5. OK, so I am leaning towards a Victron MultiPlus 48/3000/35 coupled with a Victron Smart Solar MPPT 150/35. Roughly double the price of an Axpert/Must clone but if it lasts longer than 3 years then I will be scoring anyway. What other Victron kit will I need to be able to install and do basic configuration/management of the system.
  6. Thanks for your suggestion and it is still an option but I have a multifaceted roof and the panels arranged in pairs on different parts of the roof that face true north hence the reluctance to change configuration. Do you know what Sunsynk local support is like?
  7. I'm looking for suggestions/recommendations to replace my Synerji Hybrid. I have considered Victron, Goodwe and SunSynk but can't quite work out whether they can be set up the way that I want. I also do not want to change the solar panel configuration (2 x 72cell panels in series with 3 strings in parallel) giving me 1600W. I have dedicated power sockets to power all my comms, entertainment and fridges as well as feeding all my lighting (LED). The system is set up to run off solar/battery (SBU) but will switch to mains at 20% battery discharge (50V) if mains is available or run until cut-off if mains is not available. I initially had an Axpert but the solar charger failed fairly quickly. I replaced it with the Synerji (Must clone) but the solar charger has now also failed after just 20 months. I was quite impressed with the Synerji (if a bit noisy) and it worked flawlessly until the solar charger didn't startup one morning when the sun rose. I currently have a 5kW 48V unit but a 3kW will be more then adequate as well. I would like to stay with a 48V unit (lead acid batteries) as this gives a lower current drain than a 24V option which is far kinder to the batteries. Any suggestions as to a drop in replacement that is also locally supported for spares/repairs.
  8. I'm looking for suggestions/recommendations to replace my Synerji Hybrid. I have considered Victron, Goodwe and SunSynk but can't quite work out whether they can be set up the way that I want. I also do not want to change the solar panel configuration (2 x 72cell panels in series with 3 strings in parallel) giving me 1600W. I have dedicated power sockets to power all my comms, entertainment and fridges as well as feeding all my lighting (LED). The system is set up to run off solar/battery (SBU) but will switch to mains at 20% battery discharge (50V) if mains is available or run until cut-off if mains is not available. I initially had an Axpert but the solar charger failed fairly quickly. I replaced it with the Synerji (Must clone) but the solar charger has now also failed after just 20 months. I was quite impressed with the Synerji (if a bit noisy) and it worked flawlessly until the solar charger didn't startup one morning when the sun rose. I currently have a 5kW 48V unit but a 3kW will be more then adequate as well. I would like to stay with a 48V unit (lead acid batteries) as this gives a lower current drain than a 24V option which is far kinder to the batteries. Any suggestions as to a drop in replacement that is also locally supported for spares/repairs.
  9. I'm looking for suggestions/recommendations to replace my Synerji Hybrid. I have considered Victron, Goodwe and SunSynk but can't quite work out whether they can be set up the way that I want. I also do not want to change the solar panel configuration (2 x 72cell panels in series with 3 strings in parallel) giving me 1600W. I have dedicated power sockets to power all my comms, entertainment and fridges as well as feeding all my lighting (LED). The system is set up to run off solar/battery (SBU) but will switch to mains at 20% battery discharge (50V) if mains is available or run until cut-off if mains is not available. I initially had an Axpert but the solar charger failed fairly quickly. I replaced it with the Synerji (Must clone) but the solar charger has now also failed after just 20 months. I was quite impressed with the Synerji (if a bit noisy) and it worked flawlessly until the solar charger didn't startup one morning when the sun rose. I currently have a 5kW 48V unit but a 3kW will be more then adequate as well. I would like to stay with a 48V unit (lead acid batteries) as this gives a lower current drain than a 24V option which is far kinder to the batteries. Any suggestions as to a drop in replacement that is also locally supported for spares/repairs.
  10. Thanks for that feedback and very much in line with what I was thinking. I considered the 2.4kW lithium but I don't see it having enough capacity to make it through a rainy day whereas the 200Ah lead acids would manage that as well. As long as it doesn't happen too often I didn't think that it would be too detrimental to their life. I haven't had any Trojans offered as yet and the best batteries I have been offered so far are Omni Power Deep Cycle GEL battery 240Ah/12V (2400 cycles @50% DOD) @ R6500 ea or 240Ah Victron AGM batteries @ R7500 ea. According to the datasheet, the Victron GEL Long life battery has excellent cycle performance but I haven't managed to get a quote on these as yet. If you would like to offer any further comment, it would be appreciated. OmniPower OPR240 Datasheet.pdf Datasheet-GEL-and-AGM-Batteries-EN.pdf
  11. New to the forum and new to solar. I have been running a 48 V 3kVA Axpert in standby mode for some time and all was well. I have 4 royal 1150k (100Ah) deep cycle batteries installed but these are a few years old now. This powers all of my lighting (LED), entertainment, PC and communication requirements. It would easily run the load for 4 to 5 hours during power breaks and I was quite happy with that. I recently decided to add some PV panels and set things up to run from solar first, then battery and only when these were depleted would the system switch over to mains. This meant that the batteries were now been cycled every night and within two weeks the battery capacity has dropped to less than 20Ah where previously I was getting around 50Ah or better (depending on the rate of discharge). Please note I am not complaining about these batteries as I have had very good life out of them and have been waiting for them (expecting them) to take a dive. I have been reading up on replacement batteries and all advice is to go Lithium (even 2nd life lithium) but unfortunately the budget doesn't stretch that far. I therefore need to make a call on the best Lead Acid technology to go for to give me the best cycling performance (Flooded vs. GEL vs. AGM). I plan on increasing the battery capacity to 200Ah so as to reduce the DOD and thereby improve cycle life. Every supplier I have spoken to seems to just seem to push what they have (or what they get the best margins on) and very few seem to have much battery knowledge at all. Some even get quite irritated when you ask questions about the performance in cycling applications and the effect of DOD on cycle life. Comparing data sheets is also very difficult as no two suppliers seem to test the same and go out of their way to focus on their strengths while avoiding the real issues. Hoping some forum experts can give me some sound practical advice.
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