I already touched on the workaround in your other thread.Ordered a Overkill BMS 120A for 12v 4 cells.
The concern is the Inverter, a 1500w Aims with surge will require more amps.
Is there a way around the BMS limits?
Appreciated very much.I already touched on the workaround in your other thread.
Yes that is what you should have done.But if there is a BMS, why not size it to the job
In my world simple is better, not likely to go with a relay unless it is clearly the only option.
That's exactly what I was thinking. A dc-dc charger direct from the lithium batteries. Think of the lead-acid as a way to boost current short term without screwing up your expensive LFP batteries or roasting the BMS.@amaclach, Lead acid batteries, particularly starting batteries, are good for high current, but do not like to be left discharged, even partially. They thus make for poor energy storage devices compared to lithium. But, if loads were connected to the lead batteries and the lithium was used to continuously recharge them, it could work - it would just be more expensive and complicated then a single battery chemistry. Lead acid and lithium have different voltage curves, so you'd need to connect them through a DC to DC converter/charger - again, adding to the complexity. Probably simpler to upgrade the battery bank / BMS (and perhaps the system voltage), then to mix chemistries, but I'm sure it has its place.