To give you a longer back-up time, don't go above 12 amps.Ībout the cut-off voltage, adjust it at 14 volts for a single battery UPS. In your case of 185 Amps battery, 10% of 185 would make 18.5 Amps. When adjusting DC volts, don't go above 10% of the battery Amps. You told me that you had 40 Amps hammering into your poor 185 Amps battery. I've installed their new IB-9 36 volts card in my 'desi' UPS and it's going like a boom. You can mail order the card and the guys are very reliable. Go for a good card which does charging in both 1 and 3 steps as like made by Imran Brothers, Hall Road, Lahore. This is the same as going for a manual car than an automatic one, you know what you are doing. If the load-shedding is say, after every 2 hours, then I'll readjust to 16.5 amps to go into a rapid charging mode. I'll go for 7 amps DC charging if I get a minimum of 4 hours of charging. It also depends how long is the duration of your power outage (load-shedding). I've gone as low as 7 to get maximum back-up. I've three 165 amps batteries on my 36 volts UPS and by that formula I should adjust my DC amps to 16.5. The lower the amps, the more charge will your battery hold. For a better performance, you should not go above, say, 12 amps. On a 185 Ampere battery the maximum recharging DC volt adjustment has to be 18.5 amps. I suppose you are talking about DC charging Amps.
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