Unfortunately UPS modules are designed for linear loads (constant load, I.e. Servers, etc...) and not motor type loads. The AC unit, a vacuum, electric heat all will cause the system to transfer to bypass and not support load. 30A, 3kVA 120/208/240 UPS modules are available for around $1,200.00 for a basic unit with minimum battery runtime, you just may have issues depending on what is operating in your RV.
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