Solar panel selection - Again




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  1. #1
    Join Date
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    Default Solar panel selection - Again

    I’m busy selecting solar panels and try to make a selection and at the same time not getting too confused with the detail. Have done a bit of learning J

    Details are below. The solar panel specs are just to help with the explanations and not necessarily what I want to buy.

    Equipment
    1 X 40 l Engel that will run of freeze (-4 to-
    1 X laptop to charge every second day
    1 x spotlight to charge every second day
    Daily camera battery charging
    4 strips of LED’s in the evening

    I guess my daily amps required will be about 70 Ah

    Aux battery installed: AGM 105 Ah

    Number of days with our mains/alternator power: 4


    Solar panel Specs

    See Photo


    DC-DC/MPPT (WRND Model: WDB1220B) Specs

    See Photo

    I need some confirmation/correction on the following please:

    1. Both panels can be used with the controller because it is within the 12V to 40V range.
    2. With 70Ah per day is should I rather have 2X105Ah batteries.
    3. Panel A will charge faster (higher max voltage).
    4. The controller can handle a panel with max current up to 20A.
    5. What is the relevance of “Isc” and “Imp”?

    Finally:

    1. 2x100Watt panels will do the trick for me.
    2. Please any suggestions on panels that might be more optimal than panel B above.


    Installation

    The plan is to:

    1. Have 1X100Watt fixed to the roof of the Cruiser and linked to the controller.
    2. Have a 10 meter cord for the second 100Watt that I carry in the car to connect to the 1stone when in camp.

    Does this make sense or are there other ideas.

    I know this topic has been discussed over and over but perhaps someone should help with a simple wiki J
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by lirritma; 2018/08/22 at 10:47 AM.
    Gerrit Laubscher

    Angola sempre

  2. #2
    Join Date
    Oct 2016
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    Polokwane
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    Default Re: Solar panel selection - Again

    Get the extra battery and you'll be ok for 4 days if the sun plays along

    I use 2 x 105ah DC batteries, 2 x 120w panels and the same WRND to power a 60lt fridge, CPAP device and some led light for 7 days. The larger your battery bank the better. (To carry you through cloudy days)

    Your setup will but back about 40 amps per day, give or take, so you are short on about 30 and you don't have the capacity to store extra amps.
    Jeep Grand Cherokee 2002 4.7 V8

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  4. #3
    Join Date
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    Default Re: Solar panel selection - Again

    Your panels will give you (3 amps from the 70w and 5 amps from the 100w) 8 amps x 5 hours (Fluffy's advice) = 40 amps
    Jeep Grand Cherokee 2002 4.7 V8

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  6. #4
    Join Date
    Feb 2008
    Location
    Cape Town
    Age
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    Thanked: 55

    Default Re: Solar panel selection - Again

    Thanks DC. Had some advice from Fluffy and JLK which concur with what you say.
    Gerrit Laubscher

    Angola sempre

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