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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
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  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.
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  3. #13

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    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
    Find me on motorhomer.com, a Brexit-Free Zone
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  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)
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  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)
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  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.
    Sent From My Cheap Mobile Using Tapafatfinger.

  9. #19

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    FYI here's the reply to my query from Redarc...

    Thank you for your enquiry.



    There is no limit on how much solar you can input into a BCDC. The only limiting factor is how much charge current the BCDC will produce.

    In your specific case 40 amps is what the charger can produce. The benefit you get from having more than 40 amps of solar charge available is you are able to produce 40amps of charge from earlier in the day untill later in the day.

    So the short answer is add as much as you would like David, just remember that the BCDC will only ever produce 40amps of charge max.



    For any further questions, please donít hesitate to ask either by reply email or contact our technical support line on (08) 8322 4848.



    Best regards,

    Todd Simpson
    Customer Service Technician
    REDARC Electronics

    Address:

    23 Brodie Road (North), Lonsdale, SA, 5160, AUSTRALIA

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