Solar charging Canon batteries

Discussion in 'Canon' started by Hils, Mar 10, 2006.

  1. Hils

    Hils Guest

    Does anyone have any comments on using solar power to charge Canon NiMH
    batteries? I'm wondering (in the interests of economy of both cash and
    mass) whether it's possible to modify the NC-E2 charger so that I can
    connect portable solar panels (or any other low-voltage source) to its
    existing charging circuit. My NC-E2 uses about 30W mains power while
    charging, so I guess it should run from 15-20W low-voltage input, which
    is manageable.
    Hils, Mar 10, 2006
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  2. Rather than hack into your charger (which might not be so easy), why not use
    an inverter?
    Charles Schuler, Mar 10, 2006
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  3. Hils

    Prometheus Guest

    I am a little surprised that the charger takes 30W as that is a lot of
    power for, presumably, AA cells. Perhaps it is a fast charger. You will
    need quite a large solar area to deliver that, a better solution, and
    one which saves hacking your charger, would be to purchase a solar
    charger designed for AA cells. You could build one if you have the
    skills, but then you wouldn't need to ask the question.
    Prometheus, Mar 10, 2006
  4. Hils

    Hils Guest

    Charles Schuler wrote
    Energy efficiency. The inverter would probably need 50-80W in to get the
    30W for the charger, for the 12W or so which actually charges the
    battery. That's 3-4x what I'd prefer to carry around (or pay for). A
    bigger problem may be that the NC-E2 claims to output 14.5V, which
    suggests that the charging circuit needs an input somewhat higher, which
    standard portable PV panels would struggle to supply.

    I may open and explore the NC-E3 anyway, it's long out of warranty. :)
    Hils, Mar 10, 2006
  5. Hils

    Hils Guest

    G8ILZ wrote
    The battery is an NP-E3, 12V 1650mAH.
    I've built a number of power supplies, but not for NiMH batteries and
    their special requirements. I now see that the NC-E2 charger costs about
    200ukp in the UK. It looks as though one of these

    would be a better bet. It's smaller than the NC-E2 and already has a low
    voltage input, though it will need 24V in to charge the NP-E3. (And I
    couldn't build anything like it for the price.) Worth trying, I think!
    Hils, Mar 11, 2006
  6. Hils

    rcyoung Guest

    rcyoung, Mar 11, 2006
  7. Hils

    rcyoung Guest

    rcyoung, Mar 11, 2006
  8. Hils

    Hils Guest

    Hils, Mar 12, 2006
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