Re: Solar power battery system for WRT54GS
- From: Jeff Liebermann <jeffl@xxxxxxxxxxxxxxxxxxxxxx>
- Date: Sat, 25 Mar 2006 23:06:36 -0800
miso@xxxxxxxxx hath wroth:
Like I said, I couldn't find a manual. However, it is uses a 12V wall
wart, what current does it draw?
The WRT54G and GS uses a switching regulator down to 3.3VDC. It will
run on anything from about 4VDC to about 18VDC. The regulator will
probably handle a higher voltage, but I'm worried about the input
The current drain is:
for about 4 watts dissipation. The actual current drain varies
somewhat with hardware version. This is for my V3.0 WRT54G.
The WRT54G/GS will run quite nicely directly from a 12V gel cell. For
charging, a small solar controller (i.e. Morningstar) will do just
The problem is that it burns about 4 watts continuously. To run for
24 hours without a charge (required for mid-winter operation), and
keep the battery at 75% charge, the 12v battery would need to be rated
at 30 A-hrs min. I threw together a spreadsheet for the purpose. It
was made for commercial and ham radio repeaters, but should work for
Unfortunately, to recharge a 30 A-hr gel cell in one day or less
requires a 400watt solar array (non-tracking). The WRT54G will burn
94 watt-hrs/day. The solar array would need to equal that in order to
prevent the battery from running down. At 25 watt solar array would
do the job. oh-oh, I think I just found a mistake in the spreadsheet.
Some photos of a solar powered Wi-Fi box (not mine).
Jeff Liebermann jeffl@xxxxxxxxxxxxxxxxxxxxxx
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
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