I have 25kwh of PylonTech batteries which are charge up on cheap elect overnight via 2 Multiplus IIs. They feed the house most of the time >90% but at times they feed back to the grid up to 5000W. I've looked into the various setting including the float voltage which is set at 51v with the absorption volts at 52v. The system has 2 x 70A multis and runs through a Venux GX, no solar.