Hello, May be nothing but seeking some expertise on this. I have a multiplus 12/2000/80 in my caravan, i have 2 smart solar 100/30s running separate solar panels and a Orion TR 30 for charging while on the road. I installed a second 300amp battery (same as one in it) and left to sit for 24hrs (did i need to?) before connection back to charge and loads. What i see now is what seems to be a higher voltage that the battery seems to be resting on. The only change made has been the battery addition, no updates have been made to the multiplus or other equipment. like i said it may be nothing but im just looking for someone with the expertise to tell me this. Screenshot is with the multiplus on/solars chargers on also in moderate sun. 2 days after bulk charging the Battery where it was up to 14.35volts before switching to float.
Maybe the float voltage is set to 14.2V. You are still putting amps in. Float should be around 13.5V. Check what the battery supplier states what the float votage should be and adjust the settings.
The inverter is going to be controlling everything do you have a cable to connect to access VE.config or VRM portal and windows PC?
Yeah i do have the cable. I havent changed anything there tho. may have to plug in and check all the same. all other float settings are set to 13.5 so was thinking can only be the multiplus - in saying that when it had just the one battery it never sat that high. Both are identical batterys. one has been used for about a year and is working fine.
See how you go. I run a 12V ESS with inverter charging and solar. Here is a charge curve. The inverter does about 38A, the solar does 12A. I limit the total charge to 50A using DVCC. When the battery voltage rises above 13.6V, I start to reduce the inverter charge current and let the solar do the balancing. I have a 1200VA with over 10kWh of 12V batteries. I take it down to 75% every night, that is about 2.5-3 kWh. It’s more of a backup and storage setup. After it does a 1-hour absorption at 14.2V, the system exports to drop the voltage. You can see the current is quite high, it’s over 50A.
Your system is 600AH, mine is 1140AH, so I would think you may need a load around 25A to take off the surface charge, and that is what you might be seeing. The loads you have are very small, but the charger is still charging, which does not make sense. Maybe try a decent load to drop the voltage and see what happens.
