Hello, I recently picked a MGE Evolution 850 UPS from an abandoned facility, I brought it home, and I left it charging for about 4 hours. However, when I pressed the power button, nothing happened, no

http://rep.mgeups.com/edg/edg/manuals/5users.pdf

I managed to dig up a user manual on a third party site (link below). MGE was actually purchased by Schneider Electric, along with APC, which is the world's largest UPS maker. During the integration they combined all companies under the APC label and all support for MGE now falls to APC. Following that up, I tried finding information about your model on their site, but it seems they are no longer supporting that model. Long story short, the third part link is all I could find, hopefully it provides what you were looking for.

http://www.icsgroup.ru/upload/iblock/eba/PulsarEvolutionRackManual.pdf

Battery has drained and gone.
Get new battery here http://www.battery-direct.com/ups/MGE-Evolution-MGE-EV850R.html

Please rate if this solved your problem.

Eaton Powerware now handles the MGE Evolution product. Standard warranty is 2 years warranty, Standard product exchange, including the battery(return to depot or the seller).
Eaton Powerware should send out a new unit via courier at their cost, if you call the 1-800 number and give them the serial number and describe the problem. You ship the UPS that is not working to them in the box they send out the replacement UPS and they should include a collect waybill to ship it back to them.

Red beeping triangle is a major alarm. It is most likely an internal fault. The inverter section are often the main reason. A technician has to look at the internal problem.

My mge 1500 ups is indicating fault behind with an Problem with the MGE UPS Pulsar Evolution 1500 UPS System my mge 1500 ups is indicating fault behind with an led flashing red and there is no output from the ups with or without ac input

check the inverter ckt.

Flag board and control board not working properly . replace flag board control board to solve the problem.

Buy a CB10 10 ohm ceramic resistor (10%)

Alagator clips on (+) (-) and on the resister. If the battery can not hold the charge after one minute above 12V DC, but drops very quickly that battery is due to be replaced. Very simple test and cost hardly nothing.