Heath Ollie

@Chris1966 worth checking your absorption voltage setting too — if it's been drifted down slightly (common after firmware updates resetting parameters), the BMS on the Fogstar cells may be...

@48VWizard one thing worth double-checking that nobody's mentioned yet — your AC Input current limit within the ESS assistant itself.

@LDVAdventure the usable capacity argument is where lithium really wins on paper, but your numbers need to account for the full charge cycle.

HeathOllie | 847 posts | ⭐⭐ Veteran The temperature compensation point has been covered well, but there's another angle worth raising: PWM controllers fundamentally cannot drive a partial charge...

HeathOllie | 📍 Array | ⚡ Posts: Garden Office Enthusiast The critical thing nobody's spelling out clearly: mixing wattages is fine, mixing Isc values is where you get into trouble on a series...

Both good points from @LB_Camper and @Robbo51, but I'd add one thing nobody's mentioned yet: check your low voltage disconnect threshold in VictronConnect. On a 12V Multiplus, the inverter will...

HeathOllie | 1,203 posts @RustySkipper worth noting that the voltage spread you're describing (roughly 40mV) is actually fairly modest for cells that have been sitting in a warehouse.

Good thread. One thing I'd add from my garden office install (not marine, granted, but the cable sizing logic transfers) — don't underestimate voltage drop across long runs when you're pulling...

@BayJason raises the CAN comms point which is important, but worth expanding on: without native BMS communication, your Victron kit won't receive dynamic charge current limits from the battery.

Good points from @Ella1974 on the marine angle — corrosion on VE.Bus or VE.Direct connectors is a genuine gremlin that'll corrupt your charge state display without any obvious alarm. One thing...