Added a winter/cloud cover boost to my solar array

Author	Message
Solar Mike Guru Joined: 08/02/2015 Location: New Zealand Posts: 1252	Posted: 08:27am 22 Jun 2025         analog8484 said   I've wondered how such setup might work.  Assuming you have a BMS on the LFP bank, do you see the lead batteries help with surge power that goes beyond the LFP BMS surge limit? Would you mind sharing the vacuum relay you are using? Thanks Relay: Search on AliExpress for KiloVac EV200, usually around the NZ$40 mark. Yes LFP bank has a DIY BMS, any cell dropping below 2.8v and it turns off the above relay; LFP surge only limited by a ceramic fuse, 250 amps, nothing too fancy here. There was an immediate noticeable improvement on heavy loads, like a 2KW electric jug; the battery volts hardly sag, compared to the Lead Carbon battery on its own. Mike