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I ended up with a 24vdc true sine wave inverter and a charger. Now I need ideas on how to use it in the pro master.
 

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_ 12-to-24V charger_

Wow, they've almost doubled in price since I last looked, having a 27' trailer being pulled by a pickup means 40+ feet of wire run to try and charge the trailer house battery while towing, jumping up to 24V in the engine compartment or under the dashboard to feed back to 24V trailer house battery reduces wire losses by at least half if we still invest in heavy copper wiring.

24V is good, maybe you don't need as large as charger as linked if you have shore power & solar then using the engine 12V as source could be emergencies only; driving long distances and long hours might be the only way to get battery state-of-charge up to 99% w/o shore power (depending).
 
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