IDEA...charging house battery(set) underway.

wwest wrote:
It seems that the chassis alternator/VR system will often not fully charge the house battery(set) due to voltage drop between the two, or overcharge, boil the electrolyte away, for a deeply discharged house battery(set), especially dual 6 volt deep cycle batteries where in deep discharge is expected/common use.

Remove the chassis charge connection to the house battery(set) and wire it to the armature of a SPDT relay(***1) AND the input to a ~750W MSW inverter(***2). Then wire shore power 120 VAC supply source to the N.C. contact of the relay, and the 750W MSW inverter output to the N.O. contact. The common relay contact is now wired to supply power to your progressive dynamics converter.

The PD will now PROPERLY charge the house battery(set) under all conditions.

***1 12 volt armature, ~20A 120 VAC rated contacts.

http://www.ebay.com/itm/Lot-5-CIT-Relays-40A-14VDC-20A-120VAC-12VDC-Coil-Circuit-Board-A51AE12VDC1-6-/291165015807?pt=LH_DefaultDomain_0&hash=item43cac98eff

Upgrade to a 1000W(***3) inverter then you can safely parallel in the 120 VAC fridge supply input and not worry about propane use underway (or at all, EVER!).

***2 HF 750W w/"Fixed" on/off switch

http://www.harborfreight.com/750-watt-continuous1500-watt-peak-power-inverter-69660.html

***3 HF 1000W w/"fixed" on/off switch

http://www.harborfreight.com/1000-watt-continuous2000-watt-peak-power-inverter-60704-9815.html

A big problem with this hypothesis is that the system losses have increased substantially due to the increased losses created by the additional power conversion processes and cabling/connections.

So if the charging system was inadequate before, it is now even more undersized...

There are other issues too, but no need to address those since the concept doesn't work.