From: Don Stauffer
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Subject: Re: Simple Starter DIY Photovoltaic?
Date: Tue, 31 Dec 2002 10:08:15 -0600
NNTP-Posting-Date: Tue, 31 Dec 2002 10:05:28 CST
If you size the system right you do not need fancy controller
electronics. What is the battery trickle charge current (say, the C/100
current, actually almost anything less than C/10)? If the system is
current limited (cells naturally have a fairly high internal impedence
for charging current) all you need is a reverse current diode to prevent
panel from discharging batteries in dark from reverse current flow. You
just need to make sure the max current the panel can supply is less than
current that will hurt battery. Also, cell needs a volt or two above
the nominal battery voltage, 0.6 for the diode and a little bit to flow
through internal impedence of battery and panel in series.
John Vernier Simon wrote:
> I came across a couple cheap solar panels (55 watt, single crystal)
> and figured I would try my hand at setting up a simple DC power system
> (maybe some lighting for my shed and a couple other small DC powered
> items (802.11b wireless node). My question is does anyone have plans
> for something small? I can read a wiring diagram? Any suggestions on
> where to start, links? people who have set small systems up?
Don Stauffer in Minnesota