[AZ-Observing] Re: Recharging
- From: "Bill VanOrden" <beevo1@xxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Sun, 15 Mar 2015 14:37:27 -0700
Ditch the invertor, the conversion just wastes precious Ah's.
Get an adapter to go from 12v directly to the voltage your laptop uses,
Kensington seems to make good ones.
I know little about solar chargers and will not comment on them due to this
reason. Any free advise I give in this area is worth exactly the price
paid.
FWIW, I routinely ran my setup two full long nights on a deep cycle flooded
acid battery. Laptop, lighting to see the books etc and a loaded Atlas EQG
mount slewing around a lot.
You can pick up one of these and it will tell you lots of interesting
things:
http://www.amazon.com/Watts-Meter-Analyzer-WU100-Version/dp/B001B6N2WK
Beevo
-----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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