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Take a look at your engine alternator, its set up for a 12 volt system and it will put out around 14.5 volts depending on the type of battery you have for the engine battery, that alternator will probably be rated at 100 amps or more to take care of all the stuff the coach might be using going down the road, your 84 volt solar system putting out around 10 amps will take forever to recharge 7 batteries, you will be good for a few days with 700 amp hours but the solar panels will never get a chance to charge them back up, you have a very high dollar trickle charger with the panels in series
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