Hein_d

Thanks I84RiS and Stefan Cornelissen, I feel a bit better knowing the cells wouldn't have been damaged. I did have an OVP issue which now seems fixed. Not sure if that would be due to different settings, or just updated firmware, but after what they did, it seems to have improved. I also recall that for long periods of time the battery would be at 100% SOC, and my inverter still showed lots of power going to the battery. Lots is perhaps subjective, but it looked odd and doesn't happen now. I guess it would also make sense to get them to check the firmware is the same between two batteries when you add one. I assumed if they speak with each other it would be all good. Cheers

I have a Revov R100 battery and and added another R100 about a year ago. I connected their 2 BMSs together and have my Sunsynk communicate with them via a CAN bus. I had a Revov tech on the line to confirm everything was good and they advised me to change a dip switch for the batteries to communicate with each other, but no more. Earlier this year during a prolonged power failure my SOC ran down to 40% and then my system went offline. As a result, my tropical fish died because it was cold and their heater failed, but that's besides the point. When I contacted Revov again, they got a sharp guy to troubleshoot and turns out my first battery had BMS code for a Victron inverter (I have a Sunsynk), and the second one had some other code which had to be upgraded, but after he mentioned that they both need to be upgraded to the same version. Sounds logical, but it would have been good to know the first time I called. The real issue for me is that while Revov's spec sheet that came with the battery indicates that they should have an absorption voltage of 55.5V the BMS was asking for 56V. I could see this from the panel on my Inverter. After the technician reconfigured all the settings on the battery via a console cable, the battery was now set to request the 55.5V. We could also see that the battery stated that it had only 83% life left after 450 cycles. This didn't sound good to me. After the change, my batteries are performing much better. It's still only been a few days, but it feels like when I try to run my battery down, it now lasts significantly longer. For the 1 and 2 years that I've had these batteries respectively, they've been overcharged because the BMS was not set correctly. Bear in mind that this is not something you'd be able to do yourself. I'm not sure how much damage this would have caused, but from what I understand, overcharging causes problems. Just to confirm this wasn't an isolated incident, I checked with someone else with the same battery who also confirmed the BMS requesting the 56V. Since this is not published on their website, I figured it may help someone here. TL;DR - Check whether your Revov R100 is requesting a higher voltage (56V) than it should be (55.5). If it does, call them to rectify this.