[AZ-Observing] Re: Recharging
- From: "Jim Waters" <james.t.waters@xxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Sun, 15 Mar 2015 12:20:56 -0700
A 5 watt solar panel isn't that much. The laptop current draw on the
battery plus the draw of the inverter is likely to be high. I don't think
the solar panel would be able to recharge the 12V battery enough. I am
assuming the inverter is a DC to AC inverter and you use your laptop AC
charger for you laptop. The best way to figure this out would be to try it
out first.
I would recommend getting rid of the DC to AC inverter. They aren't that
efficient. I got a 12VDC to 20VDC inverter for my laptop. This is more
power efficient. I use a Deep Cycle Marine battery and trickle charge it
off my 18 watt solar panel during the day.
Jim
-----Original Message-----
From: az-observing-bounce@xxxxxxxxxxxxx
[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of Stan Gorodenski
Sent: Sunday, March 15, 2015 11:52 AM
To: Az-Observing
Subject: [AZ-Observing] Recharging
A few years ago I had asked a question of how long a 12V battery would last
to power a laptop on a night of observing. I have a related question. The
reason I ask it is because I know nothing about electronics or electricity.
I need to be away from power for days at a time. I have a 5 watt solar panel
I bought years ago. If I run a laptop for about 3-4 hours a night with an
inverter, would this 5 watt solar panel be enough to charge a car battery
(not a battery in my pickup but a separate battery) with the amount that was
used by the laptop? I doubt it and probably need a larger panel for this to
work, but maybe it would have to be too large to be practical.
Alternatively, I would be driving about 80 miles per day. Can one charge a
separate car battery plugged into a cigarette lighter?
Stan
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