Oct 12, 2014 #1 Disha Karnataki Full Member level 5 Joined Jul 20, 2013 Messages 249 Helped 9 Reputation 18 Reaction score 8 Trophy points 18 Location india Activity points 2,231 i have a SMPS : the ratings are: 250VA capacity. 230vac i/p . battery i/p 12V. now how do i decide battery AH? say i want to use 20W 4 CFL tubes for backup time of 1 hour.
i have a SMPS : the ratings are: 250VA capacity. 230vac i/p . battery i/p 12V. now how do i decide battery AH? say i want to use 20W 4 CFL tubes for backup time of 1 hour.
Oct 12, 2014 #2 barry Advanced Member level 7 Joined Mar 31, 2005 Messages 6,333 Helped 1,194 Reputation 2,400 Reaction score 1,389 Trophy points 1,393 Location California, USA Activity points 34,480 Are you confusing an Uninterruptble Power Supply with a SMPS? Well, by GUESSING at what you are really asking: you need 80 watt-hours. 80/12=6.6 AH. This assumes 100% efficiency.
Are you confusing an Uninterruptble Power Supply with a SMPS? Well, by GUESSING at what you are really asking: you need 80 watt-hours. 80/12=6.6 AH. This assumes 100% efficiency.
Oct 13, 2014 #3 Disha Karnataki Full Member level 5 Joined Jul 20, 2013 Messages 249 Helped 9 Reputation 18 Reaction score 8 Trophy points 18 Location india Activity points 2,231 barry said: 80/12=6.6 AH. This assumes 100% efficiency. Click to expand... charging current is not mentioned on the UPS so i do not know whether 6.6Ah will suit that charging current .
barry said: 80/12=6.6 AH. This assumes 100% efficiency. Click to expand... charging current is not mentioned on the UPS so i do not know whether 6.6Ah will suit that charging current .