Done it for years
The 23U didn’t come with an inverter, and I added a $40 Candy Store (Harbor Freight Tools) 750 watt inverter and connected it directly to the two FLA house batteries (200 Ah total or about 100 Ah usable) with an 80A fusible link on the positive post. I have a five-cup coffee maker (Wal-Mart) that draws 600 watts. The draw from the batteries is 60 amps for 10 minutes, or so. That, and managing the 12VDC budget, gets us 2-3 days before charging is required. The inverter is wired in-circuit with negligible parasitic draw, as long as, I REMEMBER to switch it off after use.
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