Hi there. I have a installation where the grid impedance is very bad. With no loads on the grid (inverting) the grid-voltage is 243V when the loads come on and the inverter goes in pass thru the grid voltage goes below 220v. The problem is when the inverter switches between inverting/pass-thru the lights in the house are flickering (voltage drop?). Does anyone have a suggestion what setup I should use. Setup now is. 1phase 15amps grid connection. 2xMultiplus 2 5000 parallel, 250/100mppt, 16kWh lifepo4. ESS mode.