[Madlug] If using car batteries in an apartment was not meant as humor.

Thomas Landmann n9udl at verizon.net
Thu Sep 30 10:49:12 CDT 2004


You could build a very high capacity and safe UPS using Optima 
deep-cycle batteries, a smart charger, and a high-capacity inverter.

You'd have to brew your own auto-shutdown circuit though, not a big deal 
for the do-it-yourself types.. ;-)

Tom

William Lorman wrote:
> I would not advise home made. The batteries the UPS units use are safer 
> than car batteries - a gel type instead of the liquid acid I believe. 
> You can buy old UPS models that only need a batter easily bought on 
> either side of Madison at Batteries Plus.
> 
> I managed a fleet and industrial facilities in a previous career, and 
> learned first hand how exploded batteries are an ugly thing. Driving one 
> who is full of acid to the hospital is not pleasant as are pain and 
> loosing your vision. Then you have cleaning up the mess. I've also done 
> cable and computer related in labs where we had to study rules placed by 
> insurance companies and building code and I recall rules about 
> automotive and batteries with liquid acid. All not worth it when every 
> Sunday paper seems to have a fine UPS for $40-100.
> 
> At 10:15 AM 9/30/2004, you wrote:
> 
>> A small UPS would be perfect for that. In case you didn't know (and 
>> this is
>> meant to be helpful not insulting) when a computer is plugged into a 
>> UPS is
>> it always drawing its power from the battery, while the battery is always
>> getting recharged. That way, the power flow is "uninterruptible" because
>> even if there is  brown out, that won't effect the battery so the 
>> computer
>> keeps running.
>>
>> The main question for your situation is price. Most of them are 
>> expensive.
>> Normally I would suggest you check Google to see if you can find a 
>> design to
>> make your own with a car battery or something (there was an article on
>> Slashdot about that a wile ago), but I don't want anyone to think I'm 
>> trying
>> to insult your intelligence.
>>
>> --Orien
>>
>>
>> -----Original Message-----
>> From: madlug-bounces at madisonlinux.org
>> [mailto:madlug-bounces at madisonlinux.org] On Behalf Of matt freymiller
>> Sent: Thursday, September 30, 2004 9:32 AM
>> To: madlug at madisonlinux.org
>> Subject: [Madlug] OT Battery backup suggestions.
>>
>>
>> Ok, So I've moved into an apartment that is wired like
>> ass. I think the whole apartment is on one circuit.
>> ugh. So every time I turn something on there is a
>> little power dip. I'm looking for some cheap power
>> conditioning solution. I've been looking at the little
>> ups boxes at best buy like stores and they seem like
>> they would be fine. I'm not worried about saving a
>> system from dropping out, if I loose power that's
>> fine. I'm more concerned with saving the hardware from
>> all the little power anomalies. Does anyone have any
>> input on if these will work well for this or not. None
>> of them really say they do much for brown outs, and
>> that is my only concern.
>>
>> Thanks
>> Matt
>>
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> 
> 
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