[Energy] Spec-ing solar panel donation?
Douglas Breault
GenKreton at gmail.com
Wed Nov 30 12:06:09 EST 2011
A 12 V panel is not ideal for charging a 12 V battery. Peak voltage is only
obtained in good sunlight (a fraction of the hours available) and ideally
you want more than 12 V to charge a 12 V battery anyways. Say you snag an
18 V panel, then you're only at 18 V during noon sun and you may actually
be at 12 V during the first hours of day light. Also, keep in mind, a 400 W
(440 W?) panel is working very well for us so if they are willing to get us
larger ones maybe we should just take larger ones.
- Doug
On Tue, Nov 29, 2011 at 13:04, Sage Radachowsky
<sage.radachowsky at gmail.com>wrote:
> I would say 100 to 200 watts is a decent power though whatever is
> available. 12v nominal is best though 24v works too. Higher voltage makes
> it hard to find a good MPPT charge controller.
>
> Sage
> On Nov 29, 2011 12:59 PM, "Dana Moser" <dana at occupyboston.org> wrote:
>
>> Greetings.
>> Can anyone give specifications for a solar panel? I'd like
>> to answer this message from Eric Broadbent (ebroadbent at me.com)
>> -D
>>
>> ==============================**=========================
>> Hi Dana - this is a response to my request for panels from
>> a person who runs a solar firm.
>> I should have known to be more specific. Let me know
>> if you can get any specs - and I'll relay them back to him
>> Thanks,
>>
>> -Eric
>>
>> Begin forwarded message:
>>
>> > How many do they want / need? What power? What operating voltage?
>> > As you may know the vast majority of PV modules out there are set up
>> for grid connected systems – not battery charging and thus, run at ~35
>> volts Vmp.
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