Deep Cycle Battery + Charging & Discharging

Discussion in 'The Projects Forum' started by sanforce, Nov 7, 2013.

  1. sanforce

    Thread Starter New Member

    Nov 4, 2013
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    I want to setup a stand alone system for charging / running electronics off of a battery bank while camping. I plan to select Deep Cycle batteries, charge the batteries via 1) Solar Panels, 2) AC Charger (when available), 3) Possibly a stand alone generator later down the line. My expected load looks like:

    • Laptop #1, 90w / 12v = 7.5 amps * 12 hrs = 90 amp hours
    • Laptop #2 (wheen needed), 90w / 12v = 7.5 amps * 12 hrs = 90 amp hours
    • CPAP Portable Breathing Machine, 150w / 12v = 12.5 amps * 8 hrs = 100 amp hours
    • 6 LEDs, 20w / 12v = 1.67 amps * 4 hrs = 6.68 amp hours
    • Phone, 10w / 12v = .83 amps * 12 hrs = 10 amp hours

    90 + 90 + 100 + 6.68 + 10 = 296.68 amp hours = ~300 amp hours per day (@ 20 hr discharge rate) or: 300 / .9 = 333.33 amp hours (@10 hr discharge rate)

    If everything is connected/running at once, I will have a load of 360 watts, or approximately 36 amps on a 12v DC battery. I will probably select a 350 amp hour battery and a 500 watt inverter.

    ---

    I know how to charge this setup via an AC to DC Battery Charger. What are my options for supplementing this charge with solar panels? Thanks!
     
    Last edited: Nov 7, 2013
  2. Brownout

    Well-Known Member

    Jan 10, 2012
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    Taking a wild stab, 100W is about the maximum PV cell you want to transport to the camp site. If you get good 6 hours of sunlight, and half-power early and late, you still won't have enough to run all your stuff. Does the breathing maching need to run constantly? If you can run it for a couple hours, and leave the computers at home and use the phone only for emergency, then you might stand a change.

    Also, you don't want to run the battery any more than about half of it's rated A-H capacity
     
    Last edited: Nov 7, 2013
  3. MikeML

    AAC Fanatic!

    Oct 2, 2009
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  4. Brownout

    Well-Known Member

    Jan 10, 2012
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    I use the 2kw version in my camp.
     
  5. wayneh

    Expert

    Sep 9, 2010
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    Where I camp, there's no cell service or internet, so I don't need to worry about phones or computers. We get up with the sun and collapse in exhaustion at sunset, so a gas lantern is all we need to clean the dishes by. There's almost no air to breath, though, so I could probably use a CPAP. ;)

    By far my biggest electrical concern is starting the van at the end of the week. It's a 10 mile walk if it doesn't, albeit downhill.
     
  6. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    It's it's all downhill why is getting the van to start an issue?
     
  7. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    I've always found my Mr. Fusion to be handy when camping.


    [​IMG]
     
  8. wayneh

    Expert

    Sep 9, 2010
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    Haha, well it drops a few thousand feet over the first 5 miles but it's not exactly a steady incline. Not having power brakes and power steering would add to the fun.
     
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