Mohtaram Asif Sahib,
Here are the answers:
I suppose you are talking about DC charging Amps. Here is how you adjust them. On a 185 Ampere battery the maximum recharging DC volt adjustment has to be 18.5 amps. For a better performance, you should not go above, say, 12 amps. The lower the amps, the more charge will your battery hold. I've three 165 amps batteries on my 36 volts UPS and by that formula I should adjust my DC amps to 16.5. I've gone as low as 7 to get maximum back-up. It also depends how long is the duration of your power outage (load-shedding). I'll go for 7 amps DC charging if I get a minimum of 4 hours of charging. 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. This is the same as going for a manual car than an automatic one, you know what you are doing.
Go for a good card which does charging in both 1 and 3 steps as like made by Imran Brothers, Hall Road, Lahore. You can get the card mail ordered and the guys are very reliable. I've installed their new IB-9 36 volts card in my 'desi' UPS and it's going like a boom. Lovely is an understatement.
You told me that you had 40 Amps hammering into your poor 185 Amps battery. It must have damaged your battery. When adjusting DC volts, don't go above 10% of the battery Amps. In your case of 185 Amps battery, 10% of 185 would make 18.5 Amps. To give you a longer back-up time, don't go above 12 amps.
About the cut-off voltage, adjust it at 14 volts for a single battery UPS. Anything above will damage your battery again.
Always go for AGS when buying batteries. They are the best. If you don't find them, only then go for Exide. All other brands are a piece of garbage. Volta is the worst, don't even go near that brand.
If you have any other questions, please don't hesitate.
Regards.
