Don¡¯t forget the very efficient generator you carry along with you on camping trips: your tow vehicle.? With a DC-DC converter and even the relatively thin OEM wiring in your TV, an idling tow vehicle motor and alternator can recharge your camper battery from 60% to 85% in an hour or two, using about 0.4 gallons of fuel/hour. Of course YMMV.? If you supply robust wiring (awg 8 for example) from your TV battery through a 50amp fuse, then to your 7 pin Bargman receptacle to your DC-DC converter, the charging process will be even more efficient.
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Essentially, you don¡¯t need a separate genset.
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Dave
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If you need more power I recommend that you go buy a cheap 900 or 1000 watt generator. Double check the vendor though.? I just looked and many generators below $299 appear to be scams.? You'll have cloudy days and shaded campgrounds from time to time, and even if you have solar and lithium, you need a generator as a backup.??