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Since you're sort of on the edge of things with your thoughts ... those are tough questions to answer. A purely safety guess would be that you might be "ok" with high quality 18V PVs depending on the length of the 10 gauge wire. Assuming that's the wire gauge in your pre-wire... A 330W PV array is theoretically embarking on quite usable mild RV power generation that nets more like 250W at peak mid day operation.
Swapping to a 2000W inverter for the sake of pure sine is a logical idea if you never pull more than the original 1000W circuit design. Consider a 1000W inverter load to be about 100A draw (consider efficiencies) from your factory 12V battery source. So, the capability will almost certainly be there for unsafe AC operating conditions.
A well designed system can last many years if it factors in efficiencies and safety at all points.
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Axis 24.2 "was" tug'n a JK
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