Thread Tools Search this Thread Display Modes
Old 03-25-2020, 12:48 PM   #1
1 Rivet Member
Wayland , Massachusetts
Join Date: Oct 2015
Posts: 7
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
Attached Files
File Type: pdf IMG_2287.pdf (71.1 KB, 3 views)

jtgarcia2002 is offline   Reply With Quote
Old 03-25-2020, 02:14 PM   #2
Rivet Master
DaveP's Avatar

2004 28' Classic
Monument , Colorado
Join Date: Nov 2015
Posts: 675
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.
Attached Files
File Type: pdf Electrical Pics Wiring Diagram DP.pdf (825.6 KB, 7 views)

2004 Airstream Classic 28 "Willard"
2014 Ford F150 FX4 Ecoboost
DaveP is offline   Reply With Quote
Old 03-25-2020, 03:26 PM   #3
1 Rivet Member
Wayland , Massachusetts
Join Date: Oct 2015
Posts: 7
Awesome thanks I will take a look!! Hope all are safe and healthy. JG
jtgarcia2002 is offline   Reply With Quote
Old 03-26-2020, 07:06 AM   #4
Rivet Master
blkmagikca's Avatar

1987 32' Excella
Nepean , Ontario
Join Date: Mar 2006
Posts: 1,334
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.
AIR 12148
1987 Excella 32-foot
1999 Dodge Ram 2500HD Diesel
WBCCI 8080
blkmagikca is offline   Reply With Quote
Old 03-26-2020, 07:50 AM   #5
Wolfwhistle's Avatar
Margaritaville , Banana Republic
Join Date: Jul 2018
Posts: 540
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
Ford and 23 FB IS
Wolfwhistle is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Magnum inverter on 2014.5 AI- bad batts?? Help e93pvaz Sprinter and B-van Forum 6 09-05-2016 01:36 PM
Wiring help - magnum inverter jami20 Electrical - Systems, Generators, Batteries & Solar 23 05-16-2016 08:08 PM
Magnum inverter install question? ArtisanAir Electrical - Systems, Generators, Batteries & Solar 16 01-04-2016 02:27 PM
prices of Magnum MS2812 2800W Inverter with 125 Amp Charger carl2591 Batteries, Univolts, Converters & Inverters 42 01-28-2014 03:26 AM
Magnum Energy inverter - chargers Jammer Batteries, Univolts, Converters & Inverters 5 03-22-2011 10:11 PM

Featured Campgrounds

Reviews provided by


This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.

All times are GMT -6. The time now is 04:07 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.