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I installed 270AH lithium batteries (also left my FLA battery in place as a back up, have a 3 way switch installed). Installed a 2000w pure sine wave inverter. Tested TV, satellite, Nintendo etc. (Light loads, only a few amps).
Then tested furnace 11A. Passed. Then the big test, 1500W microwave. It pulled 164A and the OEM installed 4 gauge battery cable reached 134° in 5 minutes. I stopped the test.
If you plan on running high wattage appliances, you MUST install at least 0 gauge welders cables. Maybe 0/0 cables depending on your load. Welders cables are way more flexible to work with.
Do your homework on this. Safety first.
You also need to install a battery monitor system.
I have a Victron BMV-712. I can monitor my batteries from my phone.
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