A friend of mine gave me a old UPS of his. The batteries had run out and he just went out and bought a new one. It sat in my closet till my brother built his own. Then the gears started turning and I decided build my very own.
Now keep in mind that this will void your warranty and is not for the meek.
- UPS (free)
- Eight feet of No.10 Gage wire ($4)
- Terminal Clamps ($1.99)
- 'Big Fat Wire' between batteries (optional) ($3)
- Marine deep Cycle batteries (approx $50) (you may need two, wired in series)
- Two wire nuts
- Take the old battery from the UPS and return it to a Battery recycling center
- No. really, you should! It will not cost you anything!
- Cut the eight foot wire in half.
- Attach them to the terminal clamps (not to the battery yet!)
- Clip the ends of the wire that are in the UPS (strip about an inch)
- Twist the eight foot wires (now four feet) to the ends in the UPS
- Screw the wire nuts on TIGHT (there will be many AMPS flowing here)
- Attach the red (positive) to the plus on the battery
- Attach the black (negative) to the minus on the battery
- (if you need 24v, like me, use the plus on one battery and the minus on the other, on two different 12v batteries, then attach the 'big fat one' between the other plus and other minus, don't short it!)
- Charge overnight
If you did everything right you should have many many hours of runtime (depending on your load)
Marine Deep Cycle Battery
The Red (Positive) Terminal
The Big Fat Wire