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06-23-2024, 09:35 PM
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#1
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New Member
Join Date: Jun 2024
Location: Minneapolis
Posts: 2
M.O.C. #34484
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Adding an inverter
I'm looking to add an inverter to my 2022 3121. I do have the factory inverter prep option.
I guess my key question, will I need to add a separate transfer switch, or is there already a built in one with the factory prep?
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06-24-2024, 11:39 AM
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#2
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Montana Fan
Join Date: Feb 2019
Location: Oklahoma City
Posts: 179
M.O.C. #23433
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Are you talking about an INVERTER or a GENERATOR? Never heard of factory prep for an inverter.
__________________
Troy and Tracy Chaddon
2019 Montana High Country 330RL
2005 Ford F-350 "Bulletproofed"
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06-24-2024, 11:59 AM
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#3
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Established Member
Join Date: May 2024
Location: Out West
Posts: 47
M.O.C. #34383
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You shouldn't need a transfer switch since the 12v circuits will still be running on 12v. The inverter would run in parallel and send power to whatever 110 AC circuits that you connect it to.
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2021 Montana 3120RL. New to us as of May 2024.
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06-24-2024, 02:55 PM
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#4
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New Member
Join Date: Jun 2024
Location: Minneapolis
Posts: 2
M.O.C. #34484
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Adding an inverter
Playhouse
You shouldn't need a transfer switch since the 12v circuits will still be running on 12v. The inverter would run in parallel and send power to whatever 110 AC circuits that you connect it to.
Parallel circuits makes sense.
It would be nice to have the 7 designated inverter outlets live when we’re without shore power.
Thanks.
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06-24-2024, 06:41 PM
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#5
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Montana Master
Join Date: Jan 2022
Location: Shingle Springs
Posts: 2,395
M.O.C. #30417
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If you get the Magnum Dimensions 2K inverter it has a built in TS. Mount the inverter. Connect the prep AC in and AC out, connect inverter to the batteries and install the remote switch. Easy peesy 
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Tony & Donna & the best dog ever, Murphy.
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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06-24-2024, 07:04 PM
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#6
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Montana Master
Join Date: Mar 2021
Location: Western NY
Posts: 528
M.O.C. #28430
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I haven’t heard of an inverter prep package either. A 3121 has a residential fridge, and an inverter to run it. But, I’ve heard of a bunch of anomalies in these trailers. Anything is possible I guess. Generator prep maybe?
__________________
Mark & Karen
2021 3121rl - slide toppers, cottage white, TST 507 TPMS, X-Factors, disc brakes
2021 F-350, 6.7L, SRW CC LB - B&W Companion, Bakflip cover
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06-24-2024, 07:06 PM
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#7
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Montana Master
Join Date: Jan 2022
Location: Shingle Springs
Posts: 2,395
M.O.C. #30417
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Quote:
Originally Posted by MandK
I haven’t heard of an inverter prep package either. A 3121 has a residential fridge, and an inverter to run it. But, I’ve heard of a bunch of anomalies in these trailers. Anything is possible I guess. Generator prep maybe?
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Saw one today, advised my neighbor how to install. 
__________________
Tony & Donna & the best dog ever, Murphy.
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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06-24-2024, 07:13 PM
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#8
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Montana Master
Join Date: Mar 2021
Location: Western NY
Posts: 528
M.O.C. #28430
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Quote:
Originally Posted by Foldbak
Saw one today, advised my neighbor how to install. |
Interesting. Only inverter prep I’ve heard off was to add a second inverter just to power an air conditioner.
__________________
Mark & Karen
2021 3121rl - slide toppers, cottage white, TST 507 TPMS, X-Factors, disc brakes
2021 F-350, 6.7L, SRW CC LB - B&W Companion, Bakflip cover
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06-24-2024, 07:17 PM
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#9
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 4,004
M.O.C. #20477
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Quote:
Originally Posted by MandK
I haven’t heard of an inverter prep package either. A 3121 has a residential fridge, and an inverter to run it. But, I’ve heard of a bunch of anomalies in these trailers. Anything is possible I guess. Generator prep maybe?
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A 2022 3121 does not necessarily have a residential reefer. They dropped the 3120 that year and the 3121 can have either type reefer.
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Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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06-24-2024, 07:20 PM
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#10
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Montana Master
Join Date: Mar 2021
Location: Western NY
Posts: 528
M.O.C. #28430
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Quote:
Originally Posted by AZ Traveler
A 2022 3121 does not necessarily have a residential reefer. They dropped the 3120 that year and the 3121 can have either type reefer.
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Ok, I thought that happened in 2023, thanks.
__________________
Mark & Karen
2021 3121rl - slide toppers, cottage white, TST 507 TPMS, X-Factors, disc brakes
2021 F-350, 6.7L, SRW CC LB - B&W Companion, Bakflip cover
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06-24-2024, 07:20 PM
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#11
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Montana Master
Join Date: Jan 2022
Location: Shingle Springs
Posts: 2,395
M.O.C. #30417
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Quote:
Originally Posted by MandK
Interesting. Only inverter prep I’ve heard off was to add a second inverter just to power an air conditioner.
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I have a second inverter prep for the AC. This unit had a Dometic fridge. No Inverter but a panel labeled inverter prep. I though it was odd also but there it was.
__________________
Tony & Donna & the best dog ever, Murphy.
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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06-25-2024, 05:48 AM
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#12
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Established Member
Join Date: Sep 2022
Location: Medina
Posts: 13
M.O.C. #31722
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I have a 2022 3121RL and upgraded my inverter along with batteries. I have the original Magnum inverter I would sell. If interested PM me.
Thanks
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Greg and Lorna
Medina, OH
22 3121RL
21 Ram 3500 SRW HO Cummins
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06-25-2024, 06:19 AM
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#13
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,799
M.O.C. #24086
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__________________
Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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