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Old 03-25-2020, 12:48 PM   #1
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Wayland , Massachusetts
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Magnum Inverter Install Help!!

Hi guys.

I am trying to install a Magnum MS2812 inverter in my '87 34' Excella trailer and need a bit of help from all of you experts out there!

I have shore power coming into a single 120V panel with three breakers. One 30 amp (shore in/main) and then dual 15A and single 20 amp breakers (going to outlets).

The Magnum manual states that the input (shore power) breaker should be electrically isolated from the additional breakers (15Amp ones and 20 amp going to outlets).

Do you guys recommend simply removing the main breaker to a different box so that I can electrically isolate the breakers feeding the outlets or am I missing something? Alternatively I could leave the 30 amp and then create a new sub panel too I guess.

Also, should I do anything else (transfer switch or such) between the converter and the sub panel (outlet side of the converter)

Sorry if these are dumb questions, not very good at this stuff and feedback/advise/direction appreciated! Thanks, John
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Old 03-25-2020, 02:14 PM   #2
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2004 28' Classic
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Hi John,

Here is an installation I did in my Classic 28 a few years ago. I used two separate panels which you can see in the attachment. The only difference is that I installed a Magnum 3012M which is a hybrid inverter. I was thus able to eliminate the transfer switch because I run the shore power through the Magnum. You will need a transfer switch in your system as your model of Magnum is not a hybrid.

Hope this helps a bit.
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Old 03-25-2020, 03:26 PM   #3
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Awesome thanks I will take a look!! Hope all are safe and healthy. JG
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Old 03-26-2020, 07:06 AM   #4
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1987 32' Excella
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When I acquired by 1987 32-ft Excella, it had a Trace converter/charger/inverter that the previous owner had had installed. That wiring was used for a Xantrex Freedom 3000 and now the Magnum 2012.

The shore power goes first from the rear to the Magnum, then is routed back with an additional cable to the 30-amp breaker. Essentially they ran an additional Loomex (or whatever it was) from the charger/converter/inverter to the junction box at the rear roadside where the shore power cable is attached.
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Old 03-26-2020, 07:50 AM   #5
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So, I like things automatic. What I did was install 50 amp panel. Shore is on a 30 (L1) that side has a 20 amp breaker for ac, 15 to converter charger, 20 to water heater and a 30 to the inverter. The other feed (L2) has a 30 from the inverter then everything you want to power via the inverter. Microwave, outlets, fridge, etc. You could do the same thing with your panel with a 30 amp breaker feeding the inverter plus a sub panel from the inverter and simply move what you want the inverter to power over to it
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