Hi all
Newbee here
I have a small home office and after 5 or 6 years, found the UPS lasting only a 2-3 minutes when the power died this afternoon. Previously it used to run 2 PCs for about 15 minutes. Last had to use it about 2 years ago, so I am assuming that the batteries have passed their prime.
I am looking to replace the batteries, but was thinking about 'upsizing' the existing batteries to something a lot larger, as I would like to add on the CCTV DVR and some emergency lighting to the system.
The existing specs are :
Model ME-1400-BK
Capacity 1400VA / 840W
Voltage 230VAC
Modified Sinewave
Batteries : 12V9Ah x 2
Now I understand that the circuitry in the UPS is probably not designed to charge a 105Ah deep cell battery, but what if I was to externally charge to 105Ah ( say, with an automotive battery charger ) and then connect it to the UPS to keep it topped up. A monthly exercise would be to remove the UPS mains power, use the batteries, connect to the charger and re-charge, reconnect to the UPS.
Can you foresee any drawbacks with this approach ?
My thinking is that, the 1400VA system can run 2 PCs ( 200W each = 400W ) for around 19 minutes ?
My understanding is :
12V9Ah x 2 batteries = 12V x 18Ah = 216W / 400W ( 2 PCs ) = 0.54hr x 60% pf = 0.324 hr ( 19 minutes )
If the calculation is correct, with the larger battery, I could run :
2 x PC @ 200W each = 400W
Router 20W ( guesstimate )
Hub 10W ( guesstimate )
Cordless Phone 10W ( guesstimate )
Backup Lighting 15W x 5 = 75W
Total required = 515W
Therefore, usage time should be :
12V105Ah = 12V x 105Ah = 1260W / 515W = 2.54hr x 60% pf = 1.47 hr ( 88 minutes )
comments please ..
Newbee here
I have a small home office and after 5 or 6 years, found the UPS lasting only a 2-3 minutes when the power died this afternoon. Previously it used to run 2 PCs for about 15 minutes. Last had to use it about 2 years ago, so I am assuming that the batteries have passed their prime.
I am looking to replace the batteries, but was thinking about 'upsizing' the existing batteries to something a lot larger, as I would like to add on the CCTV DVR and some emergency lighting to the system.
The existing specs are :
Model ME-1400-BK
Capacity 1400VA / 840W
Voltage 230VAC
Modified Sinewave
Batteries : 12V9Ah x 2
Now I understand that the circuitry in the UPS is probably not designed to charge a 105Ah deep cell battery, but what if I was to externally charge to 105Ah ( say, with an automotive battery charger ) and then connect it to the UPS to keep it topped up. A monthly exercise would be to remove the UPS mains power, use the batteries, connect to the charger and re-charge, reconnect to the UPS.
Can you foresee any drawbacks with this approach ?
My thinking is that, the 1400VA system can run 2 PCs ( 200W each = 400W ) for around 19 minutes ?
My understanding is :
12V9Ah x 2 batteries = 12V x 18Ah = 216W / 400W ( 2 PCs ) = 0.54hr x 60% pf = 0.324 hr ( 19 minutes )
If the calculation is correct, with the larger battery, I could run :
2 x PC @ 200W each = 400W
Router 20W ( guesstimate )
Hub 10W ( guesstimate )
Cordless Phone 10W ( guesstimate )
Backup Lighting 15W x 5 = 75W
Total required = 515W
Therefore, usage time should be :
12V105Ah = 12V x 105Ah = 1260W / 515W = 2.54hr x 60% pf = 1.47 hr ( 88 minutes )
comments please ..