[Soekris] solar power
phk at phk.freebsd.dk
Sun Mar 28 17:38:58 UTC 2004
In message <8A1DA40786CE4741850C0AF80F2D5256CA4511 at idealab.printperpage.com>, "
Robert Woodcock" writes:
>The battery can't reach a float voltage higher than the open-circuit
>voltage of the solar cells. As long as this voltage is lower than that
>at which the battery starts to vent, it'll be ok. As I said, if he
>winds up getting an array with an open-circuit voltage above what the
>battery can safely float at, he can get a controller.
You can't get any panels of the necessary size with an open-circuit
voltage of 13.8V.
>> 2. You vastly overestimate the geometric efficiency of the solar cels.
>You wrote, "At my lattitude, 56N, to produce 100W in best case
>illumination you need about one square meter of solar panel."
>My estimate was actually a fair bit more conservative.
>From the same panel you may get 4W in clear sun in December. Your
estimate was far more optimistic :-)
>> Solar panel ----+----|>| ----------------+-------- Soekris
>> | |
>> charge controller ---|>|----+
>> ----+--------------------------------- GND
>You're implying that there's a ground connection for the solar
>panel, Soekris, and charge controller, right?
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
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