Neil Smith

Worth adding that ambient temperature makes a massive difference that people often underestimate. @WattEd and @BatteryAlan have covered the capacity maths well, but I've seen setups that work fine...

Really interesting thread this. Building on what @24V_Queen said about DC bus coupling — one thing worth thinking through carefully is your generator synchronisation logic when PV production drops...

NeilSmith | 1,204 posts @Kingy72 One thing nobody's mentioned yet — have you checked whether your cells are actually getting cold, or just the BMS itself?

NeilSmith | 156 posts Worth adding something nobody's touched on yet — at this time of year your battery itself is a significant part of the problem.

Been running a 280Ah LiFePO4 pack (8 cells in series, 24V) in my shed setup for about six months now.

NeilSmith | Posts: 312 | Location: Pembrokeshire @SolarGeorge one thing nobody's mentioned yet — have a look at your battery cable sizing and connections.

NeilSmith | Member @KenCross One thing worth adding to what @DaleSeeker said about timing — have a look at your Victron's scheduled charging feature alongside a Zappi or similar EVSE that can...

Picked up a 16s 280Ah LiFePO4 pack back in spring and it's been brilliant all summer. Running a JK BMS (the 200A active balancer version) and everything looked spot on — cells staying within 5mV...

Hey @Tommo55, just to add to what @LiFePO4Fan was getting at — the other issue with a plain voltage-sensing relay is that your alternator has no idea it's talking to a LiFePO4.