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Thread: B2B Charger...Adding Solar

  1. #11

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    Ducato CI Meridian motorhome


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    hi probly no help but the alternator puts out 14.5 volts of charge .
    any good solar mppt box can be set at what volts u want the solar to switch off on lcd screen.
    normally solar panels only put out 80% of what they are rated at .
    with all that in mind
    I have 2x100w solar panels on roof to a 40w mppt witch will not charge batterys over 14.5v
    Likes Asterix liked this post

  2. #12

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    The Redarc b2b controllers can (and do) handle slightly more than the spec suggests. Mine is a 40 amp one and regularly hits 44 amps output, which must be near 50 amps input.

    If we assume that you stick to 40 amps at 14.5v, that's 580 watts. Few motorhomes have space on the roof for that many panels.
    Likes Asterix liked this post

  3. #13

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    VW LT 2.8TDi Self-Build Camperbus
    Quote Originally Posted by hairydog View Post
    The Redarc b2b controllers can (and do) handle slightly more than the spec suggests. Mine is a 40 amp one and regularly hits 44 amps output, which must be near 50 amps input.

    If we assume that you stick to 40 amps at 14.5v, that's 580 watts. Few motorhomes have space on the roof for that many panels.
    Asterix has a 7.5t Ex-Horsebox
    Camperbus Blog and Website - www.wildebus.com
    Electrical Bits - stores.ebay.co.uk/Camper-Van-Kit
    Thanks Asterix thanked for this post

  4. #14

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    Quote Originally Posted by wildebus View Post
    Asterix has a 7.5t Ex-Horsebox
    You need about 3.25 square metres of panel for 580 watts. With frames, assume 3.5 square metres. A horsebox would easily have that much roof area, as long as there are no skylights or other obstructions, but it is an unusually large wattage to install.

  5. #15

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    I have 400W but could have easily installed 500 if I didn't have a Rear Rack, while still keeping the Light bar and Roof Fan. 600W would have been easily doable as well BUT would have meant loosing the fan, which is too important to loose.
    If I had the roof space of a 7.5t van, I reckon I would be running an array of around 800W (panels nowadays are very cheap)
    Camperbus Blog and Website - www.wildebus.com
    Electrical Bits - stores.ebay.co.uk/Camper-Van-Kit

  6. #16

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    Can't see the point.

  7. #17

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    Quote Originally Posted by hairydog View Post
    Can't see the point.
    well, you wouldn't as you love your Gas setup (but that is a different conversation that has been done to death and no point in rehashing here)
    Camperbus Blog and Website - www.wildebus.com
    Electrical Bits - stores.ebay.co.uk/Camper-Van-Kit
    Likes Obanboy666, mistericeman liked this post

  8. #18

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    Quote Originally Posted by hairydog View Post
    Can't see the point.
    I work on the principle that too much of a good thing is always better than not enough


    Thanks all for the replies,not had signal for a few days so just caught up with this thread.
    668,the neighbour of the beast.

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