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Old 04-01-2015, 04:54 PM   #1
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Join Date: Jul 2011
Posts: 19
Generator controller and hybrid inverter?

I wonder if this can be done in a Sunseeker 2290s:

1: Replace the converter with a Magnum Energy MSH3012-M inverter, and move all house power circuits to it. This guarantees that all power coming in is at 120 volts. If there is a brownout at a campground, the inverter will sense it and draw from the batteries to make up for the lost voltage.

2: Add a generator controller. This is used so that if the batteries fall below 60% charge, the generator will fire up and run until they are at 90% charge.

3: Add a Progressive Industries 30 amp EMS (HW-30C model) hardwired in, as protection against miswires, and 240 volt dryer outlets.

Magnum Energy seems to have the best system, with a control panel, generator controller, battery monitor and temperature sensor, and the inverter. However, the inverter by itself coupled with an Onan Energy Command EC-30W would do almost as well.

The advantage of this setup is threefold. The batteries will not be drained dry (assuming no quiet hours and the genset has fuel), one can use electrical appliances without worry about turning on and off the generator, and there isn't a worry about over or under voltage destroying appliances. Finally, the EMS keeps the dryer outlets from destroying the vehicle's electrical system.

Has anyone done this as a mod?

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Old 04-02-2015, 08:13 PM   #2
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Join Date: May 2011
Location: Elkhart, IN
Posts: 5,059
sounds expensive.

PLEASE do not send questions via Private Message, my inbox fills up too quickly. Post questions in the forum as a new thread so that other users can benefit from the answers. Use Private Messages for sensitive information only (VIN, Contact info or things you do not want the public to see).
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Old 04-10-2015, 12:32 PM   #3
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Join Date: Jul 2011
Posts: 19
It is not cheap, around $3000. However, I'm looking at doing this setup because part of what I may be buying is some rural land with an off-grid cabin on it. In the summer, there is a 7500 or so BTU A/C, which is easily powered by a 15 amp connection. I can just plug that into the motorhome. When the batteries hit their low water mark, the genset comes on, and when the A/C is not needed for the night, the genset charges the batteries and shuts off automatically.

I might do a subset of this. At the minimum, an Onan EC-30W controller which is about $524 from PPL. This way, I have protection from the batteries getting drawn too low, as well as the ability to store the rig and have the generator exercise itself every so often.
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Old 04-10-2015, 03:43 PM   #4
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Join Date: Jun 2013
Posts: 186
My only comment is their is energy loss for each step and its not the most efficient.

120 volt AC -> 12 v DC-> battery bank absorption-> 12 volt DC -> 120 volt AC appliances.

For off the grid, go solar and try to keep everything DC.
2011 Sunseeker 3170DS - 30,000 miles explored
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controller, generator, hybrid, inverter

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