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auxiliary battery for 110v inverter for my camper

Thread in 'Electrical - General' started by Edgardo, Mar 23, 2020.

  1. Edgardo

    Edgardo Member 2nd Gen Owner

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    Puerto Rico
    I need some info and guidance for the following project.

    PROJECT:

    1. I plan to install an auxiliary battery in the cargo bed of the truck, from which I’d be running a 12v to 110v inverter (1000watts). The idea is to hook up the 110v shore power line of my camper (which draws a max of 750w) to the inverter.

    Inverter specs state:

    Input power (max at full load) 1200 VA
    Input current (max at full load) 93 A

    2. The power source to charge the aux battery would be:

    A - Solar panels during the day, and

    B - the truck’s alternator during a few hrs at night, via a DC-DC charger to be connected to the main starting battery.

    3. To hook up the aux battery to the vehicle’s 12v system (2B, above) I’m considering one of three wiring options:

    A - the 12v power at the factory installed towing hitch, coming from a 30amp fuse at the front’s Fuse Box.

    B - the 12v power at the factory installed outlet in the bed of the truck, coming from a 20AMP fuse at the front’s Fuse Box. (Specs state: max load 20AMP)

    C - New wiring running from the main battery to the bed of the truck. (Protected with an 80 amp fuse)

    4. INFO NEEDED:

    A - How thick should the cables be to handle the inverter load?

    B - what would be the best alternative in choosing the source for the connection in #3, above? (Alternatives A, B and C were listed in the order of my preference, based on ease of installation.)

    C - With alt.4C, above, at which end should I put the 80 amp fuse?
     
  2. EddieS'04

    EddieS'04 Well-Known Member 1st Gen Owner 2 Wheel Drive V6 Engine

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    Not sure but. I think heard one time, to run 2 batteries off of your altenator. You need some sort of electronic balancing switch between the batteries.
     
  3. Edgardo

    Edgardo Member 2nd Gen Owner

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    Yes. I think you are right. I’m under the impression that the DC-DC charger does that. It’s a pretty complex (and expensive) gadget. I’m considering:

    Renogy DCC50S 12V 50A DC On-Board Charger with MPPT for Flooded, Gel, AGM, and Lithium Batteries Using Multi-Stage Charging https://www.amazon.com/dp/B07W84SS41/ref=cm_sw_r_cp_tai_5AvFEb5BCRVS5
     
  4. Thelgord

    Thelgord Member 1st Gen Owner 4 Wheel Drive V6 Engine

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    Wire gauge from inverter to battery can change based on length. Longer lines need to be thicker. Your inverter should have come with some, or at least state the size/length requirements in the manual.

    also make sure your inverter can handle 750w continually. Most inverters are marketed for peak/surge power, which should only last a few seconds.
     

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