January 26, 20242 yr Hi All, UK based person here. I have noticed today the SOC on my 3*SunSynk 5.32kWh batteries have jumped from 79% to 99% in the space of 25 minutes. I have no charge timer on and solar is only delivering 1.5kWh of power (Winter in the UK, actually winter pretty much all year round compared to SA 😆). Now I highly suspect they are out of balance as the charge indicator one of the batteries at 30% is 4 indicators and the other 2 are are 3 indicators. So whats the optimum way to balance all the batteries? Force charge to 100% then dicharge to 20% then force charge to 100% again? First picture is the SunSynk app and the 2nd is Home Assistant with direct comms to the inverter.. Regards Ivan Edited January 26, 20242 yr by Ivan Endicott Additional explaination.
January 26, 20242 yr What is the maximum voltage it showed at 100%? If the cells are scattered and the BMS cannot align them, then it is optimal to disassemble the battery and charge each cell separately to the voltage according to the instructions. Then wait a few hours and measure the voltage on each. If the difference is no more than 0.02, then everything is fine, you can assemble and use it.
January 27, 20242 yr 22 hours ago, Ivan Endicott said: Hi All, UK based person here. I have noticed today the SOC on my 3*SunSynk 5.32kWh batteries have jumped from 79% to 99% in the space of 25 minutes. I have no charge timer on and solar is only delivering 1.5kWh of power (Winter in the UK, actually winter pretty much all year round compared to SA 😆). Now I highly suspect they are out of balance as the charge indicator one of the batteries at 30% is 4 indicators and the other 2 are are 3 indicators. So whats the optimum way to balance all the batteries? Force charge to 100% then dicharge to 20% then force charge to 100% again? First picture is the SunSynk app and the 2nd is Home Assistant with direct comms to the inverter.. Regards Ivan Yes it's called top balancing, I had a powerbox with 4 x 2,4kwh batteries when the solar irradiation is poor(in winter) it would trigger a charge from the grid at inopportune times so I learned to charge to 100% from the grid atleast once a week in winter. I guess you could use the lower tariffs in the night to do that in your perpetual winter. Edited January 27, 20242 yr by Buyeye
January 27, 20242 yr Author Thanks Buyeye, I did indeed kick off a 100% charge last night so let's see if the drain is fairly linear. Thanks
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