SantoMP Posted May 17, 2022 Posted May 17, 2022 Hi everyone, I was wondering if anyone has experienced the following: I have 2xGrowatt inverters hooked up which is connected to 2x3.8 kWh strings of solar panels and they are feeding into 3x Pylontech UP5000 batteries Everything seems fine, the BMS communicating with the inverters properly the only issue that I can't seem to fix is that the inverters seem to be only charging the batteries to 50V and shows 100% on the inverters and the SOC on the batteries are showing 100% In the pylontech booklet it shows a max voltage of 53.5V and the settings on the inverter automatic got set to floating charge and charging point of 53.2V but the voltage keeps staying balanced on 50V on the inverter, if the voltage goes above 50V it starts discharging rapidly back to 50V so the capacity is really bad, for reference if the voltage drops to 49.3V the capacity on the inverter goes down to almost 60% and this seems unlikely as this should be at least 14.4 kWh with a max discharge of 95% Does anyone have any insights on what could be causing this? Quote
Buyeye Posted May 17, 2022 Posted May 17, 2022 (edited) Hi @SantoMP I believe the voltage range and behavior you are seeing is because the batteries are 15S which means fifteen 3,2volt cells in series. I'm open to corrections on this but lithium batteries do not 'float' it just settles at 49,9-50 volts which is still 99-100% same as 52.5. They best way to see how much capacity you are getting is to look at discharge on your usage stats like this screenshot otherwise your system seems to have bms communication with the inverter and working normally unless you can show that your battery discharge is significantly lower than expected. Remember to add the 17h00 to 00h00 to 00h00 to 08h00 as the inverter separates them from midnight. Edited May 17, 2022 by Buyeye SantoMP 1 Quote
Buyeye Posted May 17, 2022 Posted May 17, 2022 I forgot to say that you probably miss it when it gets to 52,5 volts. I've seen it because I know when the batteries get full and I go look at the inverter. Otherwise you will never see it. SantoMP 1 Quote
SantoMP Posted May 18, 2022 Author Posted May 18, 2022 Hi @Buyeye Thank you, I'm going to have look tonight to get a better idea, had a cloudy day yesterday so I will have a better idea hopefully by tomorrow, appreciate your input! Buyeye 1 Quote
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