hand powered Linux box

[Brian Densmore]

> -----Original Message-----
> From: Duane Attaway 
> 
> On Wed, 15 Dec 2004, djgoku wrote:
> 
> ...  APC is 
> evil and sets 
> their float voltages too high.  Its a great business model.
> 
> Marine batteries are about $60 for the 125 Ah sizes at 
> Walmart.  Pretty 
> big bang for the buck.  That's about 20 times more power than 
> the original 
> UPS battery.
You should be able to modify the float voltage by adding resistance
to the circuit. I have yet to make my homemade UPS. What do you
recommend for an enclosure? I think it's safe to assume that marine/
motorcycle batteries are to big to fit in the APC battery slot. I was
thinking about using sheet metal cut and bent.
Something like:

      
       +-+      +-+     <-- screw tabs
     +-+-+------+-+-+     | 
     |              |     |
     |              |     v 
 +---+--------------+----+-+
 |   |              |    | |
 |   |    inside    |    | |
 |   |              |    | |
 |   |              |    | |
 +---+-+-+------+-+-+----+-+
       +-+      +-+ 


     +--------------+
     |              |
     |              |
   +-+--------------+
   | |              |
   | |   inside     |
   | |              |
   | |              |
   +-+--------------+
   
    ^
    |______ screw tab