[AZ-Observing] Re: Recharging
- From: "Jim Waters" <james.t.waters@xxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Sun, 15 Mar 2015 12:29:48 -0700
I have never had an issue with the Deep Cycle Marine that I use. I have it
in a carrying case. Yes - you need to be careful when transporting it. The
out gassing issue has never been a concern for me. Not sure what you mean
by 'overloading the cigarette lighter circuit'.
Jim
-----Original Message-----
From: az-observing-bounce@xxxxxxxxxxxxx
[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of Dan Heim
Sent: Sunday, March 15, 2015 12:05 PM
To: az-observing@xxxxxxxxxxxxx
Subject: [AZ-Observing] Re: Recharging
Stan,
Figuring on a good day you'll get 6 hours of solar charging (in an unshaded
area on a clear day), that would provide 30 watt-hours ignoring conversion
efficiency losses. Your typical car battery holds about 1000 watt-hours, so
you wouldn't be able to give it much of a charge.
I'd be a little wary of having an acid filled car battery sitting on the
floor in my car and charging from the cigarette lighter, although that could
add some more capacity. I'd be worried about the charging current
overloading the cigarette lighter circuit, not to mention out-gassing (if
it's a non-sealed battery).
But a small UPS of the correct capacity, with a built-in charge controller
might do the trick. They are totally sealed. But you'd still have to check
the capacity and charging current so it doesn't blow fuses in your car.
Haven't searched online, but I'm pretty sure you could find with with a
cigarette lighter adapter. The standard UPSs usually charge from 120 VAC.
Dan Heim
On 3/15/2015 11:51 AM, Stan Gorodenski wrote:
> 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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