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Old 03-07-2017, 10:05 PM   #1
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Default Rv inverter

I was in a friends rv over the weekend and I noticed he was running all sorts of electronics and no generator. I asked him about it and he has a large inverter that powers just about everything, even the ac! He had a xantrex I think control panel. It was a really nice setup and I think he has a bank of 6 house batteries. I would like to upgrade my converter to this type of setup, I don't care about running the ac that much but it would be cool to be able to use all the outlets and such. He was driving about a 2008 Alfa see ya motorhome.

Any ideas? I'm just thinking out loud. Lol.
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Old 03-08-2017, 09:07 AM   #2
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Probably have one of the Freedom 458s or Freedom SW.
need a minimum of 4kw just to keep all that stuff running and even more for surge.

the Freedom SW's can be STACKED either in parallel (doubling the wattage) or run in series (for phased voltage).

the SW 3012 is 3kw (6kw surged) is about $2000, plus controller/remote

RV Inverter Charger | Recreational Vehicles | Xantrex
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Old 03-08-2017, 11:44 AM   #3
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I've got a 2k Xantrex running just my refrigerator. I also have a 600 watt one running my two flat screens, dvd player, surround sound, and phone/laptop chargers. I run them on my 4 golf cart (6 volt) batteries. I can run everything for quite awhile before needing to charge up.
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Old 03-08-2017, 06:29 PM   #4
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I have a small 500w cobra running my 32 inch tv, satellite, and surround sound. I just think it would be nice to be able to use the factory outlets without the generator running. I would like to run all the outlets off the inverter and leave the ac and fridge off. I would like to upgrade to 4 house batteries instead of the two I have now, just to make it more convenient. I wonder what would be a good way to charge house batteries from the main engine when driving down the road. Has anyone ever added another alternator to the mbe 4000?
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Old 03-09-2017, 01:05 AM   #5
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Our coach (mbe4000 w/ single alternator) charges the house batteries when the engine is running.

If yours doesn't I would be surprised.
Further the factory alternated is sufficient to keep up and charge our (3) house batteries.

Does your choach have an emergency gen start (battery combine) switch ? If so then your house and chassis / engine batteries are already wired together via an isolation relay.
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Old 03-09-2017, 05:11 AM   #6
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I do have the emergency gen start button, however I could not get it to work. My house batteries are about 3 years old and are going bad. Over the last weekend I had to jump off the generator/house batteries about 3 times due to running them down too low. I have a digital battery readout and when the emergency start button on it would show no change in voltage. My batteries dipped into the 10.5 volt range when dead.
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Old 03-09-2017, 05:16 AM   #7
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I wonder if the isolation relay is bad? Wonder where it's located?
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Old 03-09-2017, 08:05 AM   #8
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One way to check, put a meter on some 12v circuit of the house....measure the voltage, then start the chassis / engine - if the voltage increases then you know the engine/alternator is charging the house batteries.

chase the house batteries positive cables and see if you have one running to an isolation relay (mine is mounted on the frame rail near the house or engine batteries (I can't remember precisely).
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Old 03-09-2017, 04:30 PM   #9
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I will try that, when I tried the emergency start the voltage did not change, but the engine was off. I will try it with the engine running.
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Old 03-13-2017, 03:21 PM   #10
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With the engine running there is no change in voltage when the emergency start is pushed on. I think something is disconnected or a fuse is blown, when I bought the toter they were having issues keeping the generator running. I done a full service and have not had a single problem with it. I believe the fuel filter was the problem before. Maybe they used the emergency start and blew a fuse or something?
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