I just joined the race for m0n0wall uptime :)

 

Inspired from this build, I built my own ALIX "UPS"

Please send pictures and text if you make replicas/modifications of this, I will post them here. E-mail is at the bottom of this page.

 

Parts:
Plastic box
4x Banana connectors (2 red, 2 black)
1 Green LED with mountingbracket
1 Red LED with mountingbracket
Part of experimental circuitboard
3x 3A Diodes (BY255)
3x 1,5kOhm
13V Zener diode (BZX55/C13)
1 Diode (unknown, just to raise the zener voltage by about 0.6Volts)
1 Fuseholder
2A Fuse (slow)
12V 7.2Ah Battery


 

Circuit V 1.0 DO NOT USE THIS , I HAVE MADE CHANGES TO THIS CIRCUIT DURING THE BUILD.

Circuit for experimental boards (THIS IS THE CIRCUIT AS I'M USING IT):

Some component values are not correct, due to simulation bugs/features...

Circuit description:

As long as it has power in the battery will have a constant charge of about 13.3Volts, The batterys restvoltage is 13.0Volts.
The maximum charge current for the battery is 4mA usning my setup. This will give a from empty to full chargetime of about 3 months(!).
( No problem for me since the utility power here in Norway is VERY stable )
When input power dissappears the red LED will glow. The green will still glow too from the power passing through the red.
As I was testing the components before building the circuit i found that the 13V zener diode actually chocked the voltage down to 12.65 volts,
so i had to add another diode to get the desired voltage to the battery. ( Important to test your components! Preferably build the circuit on a trainer. )
IMPORTANT: DO HAVE A FUSE FOR THE BATTERY! This battery is capable of outputting 300 AMPS (over 3000 watts!).
The battery i have used is a standard 12V 7.2Ah. It will probably give me about 25 hours on my alixbox from a fully charged state.
In theory you should be OK using the 1N4001 diodes which is rated for 1 Amp, but as I tend to follow the better safe than sorry and Murphys laws
i switched them with BY255's rated for 3 Amps.

 

Bought some parts online.

Had a little accident cutting the circuit baord, but it works.

Back of circuit board.

This is the box cover with the battery in it.All the electronics are mounted in the cover.

FROM LEFT: input power - and +, output power - and +, Power LED, Utility power offline LED, Fuse.

Installed in the basement with the rest of the stuff.

 

 

- Non-ICE

 

 

please direct feedback and questions to non-ice@non-ice.com