BosVos

Hi All. Just a side note. For situations where the current draw from the battery is much lower than say 0.1C, the low switchover voltage setting of the Axperts is particularly dangerous to rely on routinely, as the battery voltage will remain quite high even if it gets discharged way below 50%. It is a pity that one cannot set the DoD setpoint instead, since from calculations on my system it will do a better job of protecting the batteries against these types of deep slow discharges, even though it is also notoriously inaccurate. The low voltage switchover is not a problem with more significant loads, as the voltage drop is considerably more pronounced even for a full battery and will trigger the switchover conservatively, albeit prematurely. Because of this danger my switchover setting for my 48V system is 49V. AGM Batteries.

I have a Mecer Axpert 4kW/5kW inverter and some batteries and solar panels. I don't intend to feed power into the grid at all. I'm not sure about the internals of the inverter, but I'm pretty sure it operates in two distinct modes: Solar priority supplemented by Grid and/or batteries should the load be insufficient OR Grid Priority where PV only charge the batteries. (And of course Grid-fault mode where it is a PV/UPS setup). PV definitely gets limited by the load under normal operating conditions - i.e. if the load is low, the PV will only match that and not produce exported energy. Does this sort of setup qualify as a SSEG?