Shadders

The axperts can throw odd errors if the SPS capacitors, in particluar the ones on the -12V rail have failed. It's worth replacing all the SPS capacitors if you can. I have seen the output IGBTs fail when trying to invert under the high voltage however they test fine in circuit and using a multimeter. Maybe there is a similar situation here and they are dragging the battery into protection mode and triggering F03 and the battery protection resets when you measure the battery? Here's a link showing this situation https://powerforum.co.za/topic/14666-repair-of-axpert-inverters-a-journey-started/page/27/#findComment-214451

If it recovers that's all that is required to keep the system going. I'm glad it is ticking along better.

This is the correct pin out to use. Pin 3 on the inverter should go to pin 8 on the battery and likewise pin 5 on the inverter to pin 7. DO NOT connect any other pins on the battery side to any wires. We have found that if the battery side connector has wires connected to pins 1-3, even if they are not connected at the other end the coms will not work.

This is a rebranded UP5000 not the UF5000 so it is a 15 cell 48V battery. With a nomimal cell voltage of 3.3V/cell this works out to 49.5V which is consitent with the displayed graphs and within specification of the battery. The underlying issue I have fairly certain is the BMS going into alarm because of a high cell. To help the battery balance adjusting the inverter settings and using dynamic charge current control will assist with this.

20A should be okay but 30A isn't terrible. it would be better if you could get the communication between the battery and inverter done so that the BMS can dynamically vary the current. Typically it will drop the requested charge current down to 1 or 2A when the battery is almost full Absorption is bulk charge yes. I'd recomment you try float to be 52.7-52.5V and absorption 53.0-52.8V....https://powerforum.co.za/topic/4925-best-charge-settings-for-pylontech/#findComment-197229 might be helpful These are pretty good. Pylontech max should be 3.54V per cell and looking at your values you are close to this, it's probably only 1 cell right as you first reach 100% that is going over the alarm threshold. Dropping the absorption should help.

This is the freeze bug that the axperts are known to have. The kings seem to be particularly problematic. My company has had the factory send us adjusted firmware for the SCC but we were never able to eliminate the issue at some sites and had to change inverter models. As far as we could tell the problem is triggered by the inverter seeing the battery voltage rise quickly over the bulk charge voltage so the solar power is dropped to 0V and the MPPT tries to reset and match solar power with load. If this happens too often it shuts down in an 'error mode' and only resets when the panels are turned off i.e. the MPPT voltage drops to 0. The sharp voltage "knee" of lithium cells when cells are full plays a large part. Often the BMS has gone into a protection mode because of a high cell which means the inverter suddenly has to dump energy. Looking at your data I would guess you have cell balance issues. The triggers seem to most often be: 1) Cell imbalance triggering BMS to go into alarm and disconnect from inverter. Terminal voltage shoots up as a result. 2) A load switching off when the battery is close to the bulk voltage. The SCC doesn't ramp down in time and the voltage rises quickly/BMS goes into alarm 3) A sudden shift in MPPT power caused by a cloud leaving the sunlight and ramp down doesn't happen fast enough. Are you using communications between the Synapse battery and the inverter? The Synapse's are rebranded pylontechs and coms should be possible. The BMS should ramp down charge current when almost full and prevent this happening. Methods that may assist: 1) Reduce battery charge current so the battery has longer time to balance 2) Reduce bulk charge voltage down 0.2V-0.5V so the battery doesn't sit right at the top end of cell voltages, it should still have +/- 95% stored charge

Sunwoda SunESS is IP65

Swollen batteries are pretty much end of life and can become a safety concern. BatteryView can be used to see the history of Pylontech batteries. You can try contact your supplier to see if you can get any warranty and Pylontech support in my experience have been reasonably responsive to help troubleshoot. On Deye custom settings are possible using Batt-V mode. When I set up a system I program the voltage cutoffs using Batt-V and then change to BMS-Li. In the advanced settings page, particularly for pylontech I believe, you should enable BMS-stop in case the communications is interupted (otherwise it will default back to Batt-V settings). Details on recommended charging settings for Pylontech can be seen here: https://powerforum.co.za/topic/2322-youdas-off-grid-lab/page/4/#findComment-64125 Unfortunately I have witnessed many Pylontech installations swell, even when using battery communications to the inverter and as such have avoided using them generally. How many cables are connecting the battery stacks to the inverter? For every 100A max draw you should have a pair of power cables i.e. 2 sets for an 8kW inverter.

Sorry I had a meeting and did not get a chance to complete my post, following on from earlier: - Personally I would drop SOC earlier in the morning so there is battery capacity for the panels to work closer to their maximum capacity rather than just matching load. You will save more electricity and make better use of your investment. It's nearly impossible in most applications to reach the warranty number of cycles so use the batteries more i.e. in the early morning hours before the sun comes up. Typically I go as low as 40% and as high as 60% - time slot 1, 2 (and maybe 3) I would untick grid charge. If you hit the stated % it will hold at that value but not charge from grid. You only really need to charge to 100% in the evening to give backup for the evening

A couple of comments: - I would normally set zero-export power to 20-40W to prevent prepaid meters from tripping. If you haven't had problems don't worry about it

When you installed the 2nd inverter did you do firmware update? What are the settings for: Battery 1 Battery 3 System work mode 1 System work mode 2 Advanced Function 1

Error 32 means the screen cannot communicate with the MCU. This can happen if you have a hardware failure of the SPS circuits or a disconnected/damaged cable. These are most common cause of F32 that I have seen and a firmware update won't help. I suggest checking the main board for faults.

At a guess it appears to be a Voltronics VMIV 4kW. There is firmware on the forum. It might be the VMIII but as I have never seen one and I cannot confirm.

It might be unrelated but I have had issues of late with enabling/disabling the time of use remotely, specifically on the new model Deye 8kWs. Has it been set on the inverters manually?

In addition to @Coulomb 's recommendation at an age of 2 years old it is also worth checking/changing all the electrolytic capacitors on the SPS circuits.