Davo79

Davo79 | 1,203 posts @Graham1995 Worth adding to what the lads have said — the effect is more pronounced when the battery is actually cold at the time of use rather than just stored somewhere...

Just to add to what @BarryWood is saying — cold temperatures genuinely hammer lithium iron phosphate chemistry in terms of voltage response, so the BMS can lose its reference points.

Davo79 | 412 posts | 🔧 DIY Off-Grid @MarineKaren that clockwork timing is interesting — 11:30 sounds like it could be temperature-related rather than a fault as such.

Just to add a small clarification to what @OakSpirit said — worth noting that the panels themselves don't suffer either.