BNT-1500AP replace batteries - Powercom (BNT-1500AP) UPS System

L1 is 220uH. It looks like a resistor but it is an inductor.

try removing the fans and remove a sticker at the centre, to find bearings,clean them with a cloth then spray Iso-Propyl alcohol (IP) clean with dry cloth put few drops of low viscosity oil(2T oil will help).tell me if the noise do reduce.

most probably check on your bateries.

does it have a led display for battery charge? if it is very low battery is bad,when you add a/c no output because bad battery will not provide a/c in power failure

If you unplug the unit and it powers your PC for 3 or 4 hours then turns off, it is because the batteries are empty and this is normal. If it is plugged-in with power and shuts itself off after a few hours, then the battery cells may be in need of replacing. You can purcase an inexpensive replacement battery here: http://www.upsforless.com/browseproducts/Powercom-Replacement-Battery-Kit-BNT-500A-BNT-500AP-BNT-600AP-BNT-800AP-KIN-425CSU-KIN-625CS.HTML

first u have Chaque the color coding of resistance and u fine exact value of resistor.

1. Open the UPS housing using a screwdriver.
2. Check the fuse. If is busted, have it replaced.
3. If the fuse is alright, check the battery terminal
for the stored voltage. It must be at least + or -
10% of the rated voltage of the battery. The rated
voltage is located at the battery. (12 volts). If the
voltage is below, 8 volts or only 30% of the rated
voltage. It must be replaced.
4. If the battery

From your description it appears one or more batteries are bad..The circuit breaker on the Power Strip..which more then likely is a 15 Amp..tripped due to over current conditions..check the batteries and reset the circuit breaker..That should take care of it

It need to replace 2 piece of regular 12V.7A SLA battery. It is easy to buy in the market.

If you can find a manual - you probably will not find parts- total board replacement or unit replacement is your only route Do come back to tell me I am wrong - it will be invaluable info for all of us.