audioguru said:
Some UPS's have a tiny battery (that is why you want a bigger one) that lasts for only a couple of minutes so a computer can shut down. Then it also has tiny heatsinks.
It will smoke if you tried a huge battery and have it operating long enough to get very hot.
Its charging circuit also might croak.
That all makes sense. Oh well, I know I can connect a battery charger
to a car battery and then to an inverter. I can then run the fans off the
inverter full-time. This is hard on all of the equipment involved though.
I would rather not wear the battery charger and inverter out so soon.
Seems like it could even be a safety issue somehow to me.
Anyway, what is a simple switch/relay configuration I can build to solve
this problem?
Can you point me to any articles or threads about it? I'm more than
happy to read so you don't have to type...I'm very new to electronics
and don't quite know what I'm looking for...
Could I use some type of relay with an AC power supply, that just
switches the fan input over to the battery/inverter system on the
other contacts? If so, what type of relay is this?