September 5, 20232 yr When loadshedding starts the system switches off for a minute and then switches back on. 2 x 12kW Deye Inverters
September 5, 20232 yr 55 minutes ago, Fouche Wiid said: When loadshedding starts the system switches off for a minute and then switches back on. 2 x 12kW Deye Inverters Could be an earth leakage issue or as @madness_za noted high load on the inverters that causes the batteries to switch off. In any case we need more info in terms of your setup and the error conditions
September 5, 20232 yr High load at the time of grid disconnect or a load that the battery and/or PV cannot sustain independently without grid would cause the BMS protection to kick in and the inverter in turn to error out and not turn itself off surely? Then wait for a determined timeout period and attempt to "reinitialize" so to speak. Do the 2 inverters actually power off entirely as your title suggests?
September 5, 20232 yr 22 minutes ago, LumexClipsal said: High load at the time of grid disconnect or a load that the battery and/or PV cannot sustain independently without grid would cause the BMS protection to kick in and the inverter in turn to error out and not turn itself off surely? Then wait for a determined timeout period and attempt to "reinitialize" so to speak. Do the 2 inverters actually power off entirely as your title suggests? Actually you make a good distinction there - when there is an overload like that the batteries would disconnect from inverter VS inverter actually switching off. That clarity is key
September 5, 20232 yr 22 minutes ago, LumexClipsal said: High load at the time of grid disconnect or a load that the battery and/or PV cannot sustain independently without grid would cause the BMS protection to kick in and the inverter in turn to error out and not turn itself off surely? Then wait for a determined timeout period and attempt to "reinitialize" so to speak. Do the 2 inverters actually power off entirely as your title suggests? Actually you make a good distinction there - when there is an overload like that the batteries would disconnect from inverter VS inverter actually switching off. That clarity is key
September 5, 20232 yr Good afternoon. I have the same issue running parallel 5KvA Victron MPII's with 2x 10KwH (SSS) batteries (issue since September 2021). From reading Victron forums it appears to relate to the discharge current at loadshedding. Small brownouts can occur resulting in a large draw from the batteries that can cause the BMS to disconnect. I have installed a voltage monitoring relay with contactor to cut off at say 210V, but this has not solved the problem. Apparently this is usually solved with additional capacity (which would also increase discharge current limit). Perhaps your system is undersized in terms of battery power? With 2x 12KwH inverters there can be a significant current draw upon grid failure. Others have used ESP's API and use Home Automation to automate disconnecting from the grid before loadshedding and reconnect shortly after... Unfortunately I haven't found anyone able to doing the MQTT / Modbus programming for this unfortunately. Happy to be corrected on my comments...
September 6, 20232 yr Author On 2023/09/05 at 11:56 AM, LumexClipsal said: High load at the time of grid disconnect or a load that the battery and/or PV cannot sustain independently without grid would cause the BMS protection to kick in and the inverter in turn to error out and not turn itself off surely? Then wait for a determined timeout period and attempt to "reinitialize" so to speak. Do the 2 inverters actually power off entirely as your title suggests? At the time of disconnect the inverter would run on only batteries and solar, the grid would just be on standby. There are no errors, the inverter output only switches off for a minute and then switch back on.
September 6, 20232 yr Author On 2023/09/05 at 11:56 AM, LumexClipsal said: High load at the time of grid disconnect or a load that the battery and/or PV cannot sustain independently without grid would cause the BMS protection to kick in and the inverter in turn to error out and not turn itself off surely? Then wait for a determined timeout period and attempt to "reinitialize" so to speak. Do the 2 inverters actually power off entirely as your title suggests? No high loads, no errors, just switches off for a minute and then back on.
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