[Soekris] Sanity check a solar/battery setup
zac at zacwolf.com
Fri Oct 14 18:02:10 UTC 2005
I'm wondering if folks on this list might be willing to sanity check a
power configuration for me:
I've built a Stompbox, using a 4521.
I'm using a CarNetrix DC/DC power regulator to power the 4521(12v) and a
GPS module (5v).
The CarNetrix has three power inputs:
12v CONSTANT wired directly to the battery.
12v IGNITION that controls the on/off state (powered=unit-on
12v "PULSE" (off/on/off) that override the IGNITION state to toggle
When "on" and the power on CONSTANT drops below 11v the unit is turned
off, and requires a "pulse" to reset.
I've got an 18w Solar Array, that's hooked to the vehicle's battery via
a Solar Regulator to prevent over charging AND it has a day/night
switch(hard switching logic, NOT photo-resistive "flicker") that
output's 12v during the "Night".
I have the Solar Regulator's day/nite output powering a relay. Thus I
have two 12v power outlets from the relay. One for "day"(relay not
powered) and one for "night" (relay powered).
I have the "day" output wired into the "IGNITION" input of the
CarNetrix, thus it turns on the CarNetrix during the "Day" and then
turns it off during the "Night"; this is regardless of the vehicle being
I work from home so most of the time, the vehicle is parked. I usually
only drive it on the weekends.
So the question is:
Is the 18w solar panel (it's mounted on top of the vehicle and sits in a
full sun area) going to be enough to power the CarNetrix, the GPS
module, and the 4521-receiving EVDO and pumping WiFi, without dropping
the main battery below 11V figuring avg 10 hours "on" for five days at a
Any guesses on how long it can ran in this day/night cycle without
drawing the main battery down to cutoff point? I know there's a LOT of
variables in that question but is it likely to get me through the five days?
THANKS for any info anyone is willing to give
WiFi card: http://metrix.net/metrix/products/radios/minipci/NL-2511MP.html
CarNetrix 1290: http://www.carnetix.com/CNX_1290.htm
GPS Module: http://www.allsurplus.net/Axiom/
Solar Panel: http://www.campingworld.com/browse/skus/index.cfm?skunum=28098
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