introverter

@plonkster .. thank you. I assume when battery SOC is 100% this will be whatever is set as "bulk voltage" +0.4V. e.g bulk set @ 14.4V, the MPPT will try to push to 14.8V as opposed to "Float" (13.5V + 0.4V)? After barely passing high school science it is this kind of distinction that had me spend my time on the Humanities side of varsity...

Good day all, noob looking for info (probably mostly reflecting my lacking understanding of electricity flow in a circuit – the water in a pipe analogy and google not withstanding). Short version: in an ESS setup what happens to a battery @100% SOC while the MPPT is providing electricity on the DC side to power loads on the AC side? Long version: In a very basic ESS setup connected to grid intended mainly for backup (i.e. keep battery charged unless grid fails) but use PV to power loads when (2.1) battery SOC is 100% and (2.2) PV is available/sufficient “dumb” LiFEPO4 battery (i.e.internal BMS protection for overcurrent etc. but no CANBUS comms etc.) no other smart battery disconnect contactor/relay (no BMV etc.) loads connected on multi AC out PV + MPPT on DC side of the Multi Multi + MPPT connected & controlled by a Rasberry running Venus no feedback to grid While the battery is at 100% SOC, what happens to the battery while the MPPT is providing voltage on the DC side of the multi to power loads? Is the battery constantly “exposed to”/kept at whatever voltage is coming from the MPPT? From my understanding keeping batteries at ”higher that float” voltage for a prolonged time will shorten the lifespan of the batteries. Is there some explanation based on potential difference/resistance/magical electron unicorns that will make electricity not take the off-ramp towards the battery but only keep on going towards the multi? Maybe the ESS limits the voltage coming from the MPPT to Float voltage, with subsequent increased current to maximum available to power loads and technically reduced power available compared to if no battery was used?