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Would this have enough juice? (Solar-tending)

Discussion in '3rd Gen. Tacomas (2016+)' started by Dirty Harry, Jan 4, 2019.

  1. Jan 4, 2019 at 6:58 PM
    #1
    Dirty Harry

    Dirty Harry [OP] Well-Known Member

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    Hey guys. I recently came upon a solar kit from Harbor Freight as my little bro decided he didn't want it. I'm considering mounting the panel to my tool box and running a battery inside.

    Here's what I mocked up in my head:
    upload_2019-1-4_20-55-56.jpg
    The deep cycle that I picked up is good for 35 amp hours and I'm curious whether or not it would have enough juice to jump my truck if I ran into trouble.

    https://www.harborfreight.com/12-Volt-35-Amp-Hour-Sealed-Lead-Acid-Battery-64102.html

    The plan is to just have this thing as a battery backup and possibly hook up a little baby power inverter or something to use this to power small electronics.

    Thoughts?
     
  2. Jan 4, 2019 at 7:15 PM
    #2
    shane100700

    shane100700 Retired, now a stay at home husband!

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  3. Jan 4, 2019 at 7:17 PM
    #3
    lucky13don

    lucky13don Well-Known Member

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    What size panel, harbor freight's arent real efficient. But hell, free is great. I've toyed with the idea of buying the kit for my pop up camper.
     
  4. Jan 4, 2019 at 7:18 PM
    #4
    Rock Lobster

    Rock Lobster Gon Campin'

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    Deep cycles are tricky, and it all depends on the type of battery you get. Is it a true deep cycle, designed for electric motors and the like? Those are great for driving an inverter, but not for jumping a dead truck.

    The plates are thicker on a deep cycle, meaning great storage capacity but not-so-great for rapid power draws such as turning over a cold engine.

    On the other hand, running a marine/RV battery is a hybrid of sorts. It doesn't store quite the amp hours of a true deep cycle, but contains just enough cranking amps to start an engine. That's likely what you want.

    Check out some threads on RV solar setups to gain knowledge on battery choice, and match one to your needs.

    Cool project idea!
     
    paleh0rse, Dirty Harry [OP] and cwdog like this.
  5. Jan 4, 2019 at 7:29 PM
    #5
    GreenYoda

    GreenYoda Well-Known Member

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    Small solar panels are only good at keeping a charged battery charged. They are not that great at recharging a battery. Your better off charging the second battery from the alternator when the truck is running.
     
    cwdog and hiPSI like this.
  6. Jan 4, 2019 at 7:37 PM
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    Grossomotto

    Grossomotto Complete 3rd Member

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    cwdog likes this.
  7. Jan 4, 2019 at 7:38 PM
    #7
    shane100700

    shane100700 Retired, now a stay at home husband!

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  8. Jan 4, 2019 at 7:39 PM
    #8
    Grossomotto

    Grossomotto Complete 3rd Member

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    Oops didn’t read the whole thread

     
  9. Jan 4, 2019 at 7:40 PM
    #9
    shane100700

    shane100700 Retired, now a stay at home husband!

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    lol no worries, great minds think a like. I’ve had one for years and never failed me or anyone I helped jump.
     
  10. Jan 5, 2019 at 6:05 PM
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    Dirty Harry

    Dirty Harry [OP] Well-Known Member

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    @Grossomotto okay dudes, I get that it probably makes more sense to have a purpose-built jumper charged up, but I could tend one of those with this system right? Is it even worth it to have a small 25watt solar setup?
     
  11. Jan 5, 2019 at 6:10 PM
    #11
    Grossomotto

    Grossomotto Complete 3rd Member

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    Yeah I have a small one like this for an emergency that’ll recharge cell phone and small items. A 25 watt may recharge one of those jump starters, but could take all day or longer.

    https://www.ebay.com/itm/Foldable-2...m=302280002096&_trksid=p2056116.c100935.m2460

    Honestly I think you’ll need quite a lot more than 25 watts to recharge a full size car battery plus you need full sunshine, cloudy and rainy days they really don’t work.

    Solar can be great if done correctly and the right size. But, I like gas generators and rechargeable lith ion batteries.

     
    Last edited: Jan 5, 2019
  12. Jan 5, 2019 at 6:29 PM
    #12
    shane100700

    shane100700 Retired, now a stay at home husband!

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    That’s the thing, I won’t say I have a lot of experience with solar but typically they push really low amps. I looked into it for my wood shop but it’s completely unrealistic. Amps is what is important with starting a car, that’s why you can’t use typical AA or D cell type batteries. I know because it was a physics question last semester. Same is true of solar, the amps are way off.

    Most of the jump starters can be recharged with 12v/ 120v solar, 12v car or 120v house electric.
     

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