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NWLady's avatar
NWLady
Explorer
Oct 23, 2013

need help with install of inverter in Class B

Currently have one flooded trojan house battery in my 1999 Coachman Class B that also has a onan 2800 genny. Almost impossible for me to get to the existing battery for maintance and I want more battery power. I know I could use my generator for 120v power but HATE the noise but don't want to take genny out as is useful sometimes.

The plan is to do a stepped upgrade.

1st stage: put in four AGM 6v lifeline batteries, a trimetric 2025 rv monitor with 500 amp shunt and upgrading my magnetek 7345 controller with maybe powermax boondocker. (which controller isn't 100% decided.)

I know I don't know everything about this 1st step but I think that there isn't too much modification necessary.

2nd stage: when budget can afford, I want to incorporate a 2000 - 3000 pure sine inverter. I know there are different ways to accomplish this but at present I am favoring the installing a 30 amp receptacle from the inverter on the outside of the van and plugging the shore power plug into this when I want to run 120v off batteries.

I know I have to not have the converter charging the batteries when the inverter is running. ...which I think would be happening if the shore power is plugged into the inverter 30 amp receptacle.

Question: would it work to just use the "disconnect" switch that currently exists when I use the inverter?

I am sorry if this is explained somewhere. I have spent a lot of time looking at the info here and other places. It probably has been answered but I either missed it or didn't clearly understand what was being said.

Thank you very much for any help, Mary my email is: dancermm@comcast.net

11 Replies

  • The battery disconnect switch would not work for that, since the converter would still get its 120v from the inverter. You need to switch off the converter.

    The 7300 is a decent converter for when on shore power. We kept ours for that, and got the PowerMax deck mount as an additional charger, mounted close to the batts, for use when fast charging is needed on generator, to reduce gen time.

    You can mount the new converter right beside the new big inverter and they can share the same short, fat wires to the battery so you don't need two sets of those. Just go across between the inverter and charger then on to the battery bank.

    We also do the whole house by plugging the shore power cord into the inverter and can run the microwave, TV, etc. Works great.

    To isolate the 7300, which usually is on the same breaker as the receptacles you still want to work, you have to find the black wire coming up from below to the breaker and snip that, insert a switch, and then you can leave the breaker on so the receptacles work while the converter is switched off.

    The new deck-mount converter can just be unplugged from the 120, unlike the hard-wired 7300.

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