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High DC Ripple Multi 12/3000/120 when using appliance

Setup is 1260AH Lithionics (2x630AH) External BMS 400amp Contactor. Victron Multi 12/3000/120. When Using a coffee maker, A/C (has a soft start installed) or microwave the DC Ripple exceeds 1.6v and inverter trips a low battery warning. There is 20ft 2 runs of 4/0 cable between the Distribution and the inverter. I did try moving the inverter 8ft closer and it only dropped the DC ripple by .2 but would still eventually overload and give a low battery warning. Inverter is fused properly all connections are torqued to spec. Im at a loss at the momenth for what it could be. I have been reading the DC Ripple in wiring unlimited

MultiPlus Quattro Inverter Charger
2 |3000
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reuter answered ·

You should try measure real voltage drop from battery terminal to inverter terminal with multimeter. Use some heavy active load for this test. Some heater is perfect for this. To 2 separate measuring for positive and negative trace.

It can be crimping issue, dirty cable terminals or most likely relay contacts

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