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EstorilM's avatar
EstorilM
Explorer
Mar 02, 2018

Power outage, moving into TT - tractor to charge 12v?

Power is probably going to be out for a few days. Generator is at my parents a few hundred miles away (yeah, not convenient) so I'm on my own with 12v.

I have a second marine deep cycle, but that's only going to get me so far with the propane furnace blower, etc.

Two questions - one, I have an 800w inverter but I'm not sure how to hook this up in this case. I would just plug the RV into it and keep my power usage down, but I would need some way of bypassing and disconnecting the power supply/battery charger.

I'm guessing the most efficient way to do this would be to run large gauge 12v wires inside the TT and run the inverter off of batt directly/separately, then only plug in the few 120v things I need (ie not use any of the TT's 120v systems).

As far as keeping the battery charged, I have a diesel tractor - do you think the alternator generates enough current at idle to charge up the batteries? I'm thinking I'd just run the two deep cycles in parallel then run the tractor every now and then to charge them back up. I should be fine at night as it's just the furnace blower that would be running.

I could always use the LR3 as it has a 160A alternator and a huge battery, but nowhere near as efficient. I could run the diesel deere on a couple gallons forever (and it's obviously made for idling anyways).
  • I would guess that the tractor alternator is quite small, basically only sufficient to keep its starting battery up. Depending on the size of the tractor, it could be in the 15-30A range. (It also has little need of working very well at idle speed since a tractor is generally operated at full rated RPM.)

    I second the suggestion of getting an inexpensive generator. Even one of the little two stroke 900W units would probably serve you okay for this situation; they should be able to power the converter to charge up your 12V batteries, though you might have to force the fridge to run on propane during that time.

    If you're feeling rich, there are nice PTO-mounted and powered generators available for tractors that would do a fine job here, too, and might prove useful in other circumstances.
  • You can pick up one of the Champion 3500 watt generators for around $300. I have one that I have used frequently for the past 4 years and it has held up great, no complaints. And it will run everything. Might be something you would want to look into.

    As far as running the propane furnace over night, you battery will most likely need a recharge every morning.
  • Lynnmor wrote:
    Might be the time to buy a small and cheap generator.


    MUCH preferred to his other ideas.....which all are pretty much BAD.

    P.S. How is it that you know ahead of time that this is going to happen ??

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