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Thread: Charge two small motorcycle batteries in my Caravan?

  1. #1
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    Charge two small motorcycle batteries in my Caravan?

    I know this isn't right on track with MP3Car ... but you guys know a lot about this stuff.

    Long story short, I am trying to rig up a temporary "mobile power" solution in my van for when I go camping. I've tried all sorts of things, but the best/cheapest solution seems to be to use this old APC true sine UPS I have now reloaded with two new motorcycle batteries (they fit in the UPS and yes it's very heavy).

    The problem is I have no solution to charging these batteries while on the road. What I aim to do is use the thing to power a computer, etc. when the truck is not running as it seems like it will go for nearly an hour or so depending on what I'm powering. Then, of course I'll have to recharge without access to an AC utility. I have a rather crummy older Vector 750Watt inverter that does not seem to power the UPS at all.

    Could I somehow wire the batteries direct via an available cig lighter for recharge or would that be too much load on my van's electical system? I've already had some "weird" problems years ago which the dealer tried to blame on my little vector inverter. I still don't think it was causing problems though I don't want to push anything beyond the limits. Thanks for any advice!

  2. #2
    FLAC
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    the apc unit in a car sounds interesting, but really simple is best. use a small deep cycle battery thats simultaneously charged with the starter battery via a battery isolator. its automatic, the pc will never kill the starter battery, and if you need a/c power you can still run an inverter off the deep cycle or the starter battery (depending on size of inverter)

  3. #3
    Variable Bitrate dMand's Avatar
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    using an APC with an 750 watt inverter to power a pc is draining your battery, therefore limiting your ability to use the pc.

    I would like to suggest that you use an DC-DC power supply, instead of carrying that extra weight, wondering how to charge the APC.

    Bear in mind, that with the route you are taking, your alternator is working up to 35% harder to keep the PC running by being powered that way.

  4. #4
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    I never said I was powering a PC. I figured out what to do anyway a LONG time ago. I've got a deep cycle marine battery that I use to power the inverter. I charge the battery when it gets low.

    Geesh. What's with this forum? It takes like weeks to get your post online and then the only response is "get a DC/DC power supply". Whatever that is. Stupid.

  5. #5
    Variable Bitrate dMand's Avatar
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    Quote Originally Posted by mcegoon View Post
    I never said I was powering a PC. I figured out what to do anyway a LONG time ago. I've got a deep cycle marine battery that I use to power the inverter. I charge the battery when it gets low.

    Geesh. What's with this forum? It takes like weeks to get your post online and then the only response is "get a DC/DC power supply". Whatever that is. Stupid.
    I went along with trader's post thinking it was part of your agenda, hoping to help you out.


    My bad, Mr. Mc Goon. I see that you're actually here inquiring a remedy to a jury rigged camping apparatus that was intended for the information technology sector.

    While out in the field, are you trying to power an electric range, or a hot water heater?




  6. #6
    FLAC
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    op, were here to help. you dont want it why you come here? this is a place for computers in cars, and a damn good one. what ARE you trying to do?

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