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  1. #1
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    Improper Battery Gauge Wire

    Just picked up my 349m-r that has factory solar and gen set. I'm replacing the lead acid battery with 2 LiPo batteries (300Ah each) and while doing so noticed that the pos/neg battery cables are only #4 wire. The inventor is the factory 2000W CSW2012 which appears to have either #4 /0 or #2/0 cables (to fuse, disconnect switch and block). However the battery gauge is much smaller.

    Shouldn't the battery cables also be #4 /0 or #2/0 (I need to confirm which it is)?

    Click image for larger version. 

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    2021 Grand Design Momentum 349m-r
    - 8k axles, toppers, 3rd ac, Onan, Solar, Outside Entertainment, King Bed, Heat Pump, 3 Season Doors, Dual Pane Windows, Happi-Jac, Rear Al Deck
    2021 Ford F-450 Limited

  2. #2
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    What size breaker?

    Iíd think 1/0 would be fine for the inverter at full power.
    Last edited by jkwilson; 06-14-2021 at 10:41 AM.
    John & Kathy
    2014 F250 Lariat FX4 6.2L SBCC
    2014 Reflection 303RLS
    SW Indiana

  3. #3
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    Quote Originally Posted by jkwilson View Post
    What size breaker?
    Invertor supplies power via a single 20a outlet which powers a dedicated breaker panel box with 3 15a breakers (frig, bunch of GFCI outlets, vacuum). Is this what you are asking?

    Doesn't really matter as the most the inventor can put out is 2000w continuous (4000w peak) which at >90% efficiency means a max of about 185a DC input thus the battery wire gauge concern.
    Last edited by NDanecker; 06-14-2021 at 11:08 AM.
    2021 Grand Design Momentum 349m-r
    - 8k axles, toppers, 3rd ac, Onan, Solar, Outside Entertainment, King Bed, Heat Pump, 3 Season Doors, Dual Pane Windows, Happi-Jac, Rear Al Deck
    2021 Ford F-450 Limited

  4. #4
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    Quote Originally Posted by NDanecker View Post
    Invertor supplies power via a single 20a outlet which powers a dedicated breaker panel box with 3 15a breakers (frig, bunch of GFCI outlets, vacuum). Is this what you are asking?

    Doesn't really matter as the most the inventor can put out is 2000w continuous (4000w peak) which at >90% efficiency means a max of about 185a DC input thus the battery wire gauge concern.
    The inverter output is limited by the weakest link, meaning the lowest rated current limiting device. The breaker in the battery lead is probably the limiting factor since it should be sized so that the wire is protected. If the breaker is properly sized for the wire, you donít have a safety issue, but you canít use all of the capacity of your inverter without upgrading battery wire size and and breaker size.
    John & Kathy
    2014 F250 Lariat FX4 6.2L SBCC
    2014 Reflection 303RLS
    SW Indiana

  5. #5
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    Quote Originally Posted by jkwilson View Post
    The inverter output is limited by the weakest link, meaning the lowest rated current limiting device. The breaker in the battery lead is probably the limiting factor since it should be sized so that the wire is protected. If the breaker is properly sized for the wire, you don’t have a safety issue, but you can’t use all of the capacity of your inverter without upgrading battery wire size and and breaker size.
    Understood and agree. However, I can't imagine why they would size it such that it would trip the breaker before meeting the demand of the inventor, but I've seen crazier stuff from manufacturers. Its also false advertising as they market it as a 2000W system. Will look for breaker and report back.
    2021 Grand Design Momentum 349m-r
    - 8k axles, toppers, 3rd ac, Onan, Solar, Outside Entertainment, King Bed, Heat Pump, 3 Season Doors, Dual Pane Windows, Happi-Jac, Rear Al Deck
    2021 Ford F-450 Limited

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