[Chaos-l] Fw: 12v battery recommendations

[Michael Hrivnak]

I have a 33Ah AGM battery from Batteries+. AGM is great because they
have very low internal resistance, so they never get hot, and you can
recharge them very fast. Some batteries have longer total lifespans
when you recharge slowly, but with AGM, you can put about as much
power as you have available into them without harm. Also, AGM
batteries have very low self discharge rates, on the order of
1-3%/month, so if you accidentally leave one disconnected from a
trickle charger for a while, you will still have plenty of power
available.

Michael

On Thu, Sep 20, 2012 at 7:33 PM, Mark Montazer <mark at montazer.org> wrote:
> Costco sells a well-reviewed Kirkland deep cycle battery for about $68. It's
> rated at 125AH, though I think it's flooded, not maintenance free,  and not
> an AGM. Costco's batteries are produced by Johnson Controls, which also make
> the Duralast and Diehard batteries, as well as Wal-Mart's too (I believe.)
> If you feel crafty you can put one in a battery box and wire up some
> cigarette lighter receptacles (fused) and probably come in at half the price
> of a Sears Diehard Platinum ($220 @ 68AH).
>
>
>
> I’m going to follow this guy’s tutorial at some point:
>
> http://myastroimages.com/Equipment/Telescope_Field_Battery_DIY/index.php
>
>
>
> Mark
>
>
>
>
>
> From: chaos-l-bounces at rtpnet.org [mailto:chaos-l-bounces at rtpnet.org] On
> Behalf Of matted
> Sent: Thursday, September 20, 2012 7:21 PM
> To: Alexey Toptygin
> Cc: CHAOS Mailing List
> Subject: Re: [Chaos-l] Fw: 12v battery recommendations
>
>
>
> Yes, that is about the only thing I don't have an AC adapter for.
>
> I typically run two things on my dew zapper... One band around my 8" SCT and
> the other around my finder scope.  At full blast the battery only lasts an
> hour or two.  However, I've started putting them both on at about 20% as
> soon as it gets dark and it's never drained the battery, even after ~6 hours
> of continual operation with my mount, camera, and often a laptop also
> drawing power.
>
> The radio built in stinks, but otherwise I highly recommend it.
>
> -Matt
>
> On Thu, Sep 20, 2012 at 7:15 PM, Alexey Toptygin <alexeyt at freeshell.org>
> wrote:
>
> On Thu, 20 Sep 2012, matted wrote:
>
> This is what I bought...
>
> http://www.amazon.com/Duracell-DPP-600HD-Powerpack-Starter-Emergency/dp/B000TKHMWK/ref=sr_1_1?ie=UTF8&qid=1348181969&sr=8-1&keywords=duracell+battery+amp+hour
>
> Very happy with it so far.
>
>
>
> I was looking at that one earlier. Do you run heaters off of it? How much
> time do you get on one charge?
>
>                         Alexey
>
>
>
>
> --
> Matt Lochansky
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>
>
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