Tab 320 S - AC on lithium battery

Hello all,

The previous owner of our new-to-us 2021 Tab 320S installed two 100Ah batteries and a 2000W inverter. With this set up, microwave did not run at all, but if I recall correctly, the AC ran with compressor - sorry we only had it for a month. The batteries also were not holding much charge now, so we decided to upgrade to WattCycle 314Ah Mini Super (200A BMS) lithium and replace the inverter with Renogy 2000W (4000W surge).

I mistakenly assumed that this setup would be capable of running both the Microwave and the Air8 air conditioner - not at the same time, of course.

Microwave runs fine now, but although the Air8 fans start, as soon as the compressor kicks on, the inverter goes into a fault mode. The battery is in the front storage box, via 1/0 cable, and the inverter is under the driver-side cushion. (about 8-10’?) Suspecting voltage loss being the cause, I brought the battery inside and connected via 3’ 1/0 cable, but still no go.

For those of you with lithium system capable of running AC, could you please share your set up? Inverter you are using, etc.? Once I find the working setup, I also plan on bringing the battery inside to reduce the length of the battery cable a bit.

Thanks!