I am being a smarty here, It depends on how low the battery charge got. For real I do not have any guide. I have been using gennys since around 1970 during dry camping and what we did when I was a kid I still do. Just run it in the morning for 1-2 hours and again at night or evening, everyday. Those run times the coffee ,tv, micro etc get used. On those real hot days running the a/c and genny helps charge them too.
Edit: Buzz you beat me to it and with a better answer.
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2013 24RKSWE (27ft TT) Cougar 1/2 ton series SOLD 10-2021
2013 Ford F350 4x4 CC 6.7 engine, 8 ft bed, 3.55 rear end, lariat package
Retired from Oregon State Police in 2011 than worked another 9.5 years as a small town traffic cop:
As of 05-2020, I am all done with 39 years total police work. No more uniforms for me.
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