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I’m a newb and this is my first thread, so…..go easy on me… I have a Winnebago View that has the T1N Sprinter engine. It’s my understanding that it can be modified to fit an additional alternator/generator. I’m interested in adding a 24 volt alternator so I could charge a 24 volt battery...

They are made/sold by a company on FB for $130 which seems like an inexpensive option for 550 watts but for a roof array built 4-6” above a galvanized metal roof, what would be a reasonable expectation of watt production under perfect conditions? TIA