Thread: 300watt inverter, 700va ups and a 90watt powersupply?

Just keep in mind you'll have to wire an on/off switch to the UPS, as it won't turn off automatically when power is cut to it. This means a constant, annoying beeping when power is off, plus it will drain its battery. UPS batteries aren't designed to be drained/recharged more than a few times, and the battery will probably die pretty quickly.

As long as you can extend the UPS's on/off switch to where you can easily reach it and switch it on/off every time you turn off/on your car, I don't see a problem with it. In fact, that would be a good way to make sure your carputer can survive cranks

The UPS I have got I took the beeper out of it to stop the beeping noise and the software that came with it first shuts down the computer, then when the computer is off it turns off the ups But yes I will still need a switch to turn the UPS back on which in turn will turn the computer back on also

And yep it will be great for making the comp work through cranks, I never thought of that acctually!