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audioguru said:UPS. United parcel Service.
Uninterruptible Power Supply.
I spelled it wrong on the other website.
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.
weegee said:because the batteries in UPS are so expensive to buy, you can find ENORMOUS UPS (6u x 19" x 3' or 4' deep) on ebay. These are designed for server farms ect, where they are required to keep LOTS of servers alive for reasonabley long periods.
I would have thought you could hack one of these.
What sort of current are we talking about?
That is exactly my setup. People toss a working UPS in the trash because it costs little more to buy a new one than it does to replace the battery. So I just take it and connect an externel battery. I use an old car battery whi is no longer good for cranking but still has plenty of life left in it and is also free.mikek said:I get the ups for free, toss the gel-cells and run a wire out to the battery. The ups keeps the battery up, and I've only had one drop dead.
The OP is looking for about 200 W which can easily be handled indefinitely by almost any UPS. The problem is getting the battery to last for 4 hours. I would say you need about 200 Ah which is about 4 car batteries. A 200 Ah deep cycle battery would be best.mikek said:Audioguru is right about heat sinks and overloading the unit. I now look for units with fans. I have a Powerware Personal 1000 I'm trying to revive, but can't find schematics. It's blowing the internal 30 amp fuses on the 30 volt side.