How to hook up the battery to Best Power UPS Model
You are correct the Positive (+) is the fuse and the other two (orange in my unit) wires both go to the negative (-). Also your battery should be at least 12V 75AH dry cell with a holding voltage of 14V when charged, a standard battery will not work, the unit will boil it dry. This will give a 5 min run time at 75% load (115V 9A continuous).
I changed the units configuration to use a 12V 750AH wet cell by changing its holding voltage to 13V, adjustable on the charging board (the outer most board when the cover is off that is). By doing this the battery costs about $75 not $140 and I get a run time of 4 hours 30 min. at 75% load. My entire office is floating on this unit. Also this unit will require a house current voltage of 105V-125V on a 15A breaker. Yes house current varies all the time by +-10 volts. and unit will use about 10A when running at 75% and charging. The normal output at full load for this unit: 115V 11A. continuous, ( the computers in my office pull 7A to 9A when they are in use, idling at 4A when not in use. So when the power fails I just keep working.
Another thing to note with the new configuration for a wet cell battery, monitoring software will initially show a low run time of 3 to 5 min., but after the unit runs for about a minute on battery the software will adjust to the real run time. So set low battery shutdown for about 2min and the software will work fine.
Ok a little background about the 1.4KVA Battery Backup from Best Power Tech. When I purchased this unit some time ago, it carried a double lifetime warranty good up to $250,000. Not bad for a $2,000 unit. What that meant was not only would the equipment protected by the unit survive a hit, but the unit will also. So far this unit has handled 17 blackouts, over 40,000 line spikes (Voltage greater than 125) and over 3,000 brownouts (Voltage less than 105) and maintained a constant 115 Volt output. (Sub note here the unit beeps while a brownout is in progress, because the battery is being used to help maintain Voltage.) Also this is the same model used at the Kitt Peak Observatory in Arizona. I was encouraged to call and talk to them about the unit, very impressive track record!
No Budget Productions
on Oct 06, 2011