car amp for solar system and rv questions

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  • k1m0e
    Junior Member
    • Apr 2014
    • 2

    car amp for solar system and rv questions

    hello, new to solar, just purchased a 240 watt solar panel and a 30 amp mppt provista programmable controller, I will be using this system to power my rv, but I don't want to mount the panel on my roof of my rv, I have built a electrical shed for this purpose, and will be housing as well a 1000xantrex pure sine inverter, and all the components for the system, my panels will be located about 50 feet away, still have to figure out the wiring for this. In the process looking to purchase batteries as well, have it narrowed down to either Trojan 6volt 225 amp hours, or the usbattery 6 volt 232 amp hour battery, will be needing 4 batteries making 2 12volt banks for an 460 amp hour total est... because I purchased the panels in another town, I am getting flak from a dealer saying that the panel I purchased is crap, he says it is designed for grid tie purpose only, does this make sense??
    also does the 30amp controller able to charge these 4 batteries, will only be using the system from Friday night to sunday morning, giving the rest of the week to charge the batteries. another question, the xantrex pure sine inverter is going to be used for only running a movie projector drawing 3.2 amps ac and will be running the projector for about 3 hours tops a night unless the neighbors call the police, I had an idea about purchasing a car amp to power the music for evening events as we watch music videos, and the laptop is good for 3 hours without plugging in, I figure I will charge the laptop and iphone during the day, anyone ever tried a car amp tied into there solar system, think its a good idea since its dc powered?? and last question, I am trying to figure how to wire the leads from the controller to my rv, I am thinking about drilling a hole thru the side of the trailer and putting some kind of plug so I can unplug when I take the rv on a trip, I am not sure as well where to hook up the controller, but was told to tie it to the rv transformer. lots of questions any comments greatly appreciated thankyou.
  • Sunking
    Solar Fanatic
    • Feb 2010
    • 23301

    #2
    Originally posted by k1m0e
    hello, new to solar, just purchased a 240 watt solar panel and a 30 amp mppt provista programmable controller,
    and will be housing as well a 1000xantrex pure sine inverter, and all the components for the system, my panels will be located about 50 feet away, still have to figure out the wiring for this. In the process looking to purchase batteries as well, have it narrowed down to either Trojan 6volt 225 amp hours, or the usbattery 6 volt 232 amp hour battery, will be needing 4 batteries making 2 12volt banks for an 460 amp hour total est...
    You do not have enough panel wattage to support a 12 volt 460 AH battery. Only enough to support around 200 to 250 AH battery. Not to mention your inverter is to large for your needs and you do not have enough battery capacity to use 1000 watts.

    Originally posted by k1m0e
    because I purchased the panels in another town, I am getting flak from a dealer saying that the panel I purchased is crap, he says it is designed for grid tie purpose only, does this make sense??
    Stay away from that dealer as he is clueless. If you have a MPPT controller, you can use grid tied panels. If you have a PWM controller you must use more expensive battery panels.
    MSEE, PE

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    • mapmaker
      Solar Fanatic
      • Aug 2012
      • 353

      #3
      Originally posted by Sunking
      You do not have enough panel wattage to support a 12 volt 460 AH battery. Only enough to support around 200 to 250 AH battery. Not to mention your inverter is to large for your needs and you do not have enough battery capacity to use 1000 watts.
      And if you did have enough panels to support a 460 ah battery, I'm not sure whether they could support your loads.

      I guess that your daily energy consumption will be nearly 2 kwh. That's not a problem for that sized battery, except that you're going to be drawing that over 3 hours... which is a problem.

      The 460 ah rating of your battery bank is based on the assumption that you are drawing it down over 20 hours (that would be a 23 amp draw). You will be asking that battery to put out at least 55 amps for 3 hours.

      There will be voltage sag... maybe when the batteries are fully charged and still fairly new they will go the full 3 hours.

      --mapmaker
      ob 3524, FM60, ePanel, 4 L16, 4 x 235 watt panels

      Comment

      • k1m0e
        Junior Member
        • Apr 2014
        • 2

        #4
        thankyou for your input, I am going to only purchase 2 Trojan batteries at 230 amp hours total, just going to use the system I have to run the trailer for the time being, going out to invest in a good Yamaha 1000 watt generator for running movie night and larger loads at night. maybe in the future I will invest in a larger system.

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