I don’t have specific numbers for you, but I have observed that family gets pretty inefficient if you run it way below rated capacity. You seem to hit a wall as you drop the load, like 200 watts for 4 hours, 100 watts for 4 hours, 50 watts for 4 hours, no watts for 4 hours. Especially if you are trying to push the runtime out to days.
Any reason you are using a 2200 VA unit for only 70W? Instead of, say, a 700 VA unit? Wanting the faster charger? From: Josh Luthman Sent: Tuesday, January 20, 2015 2:14 PM To: [email protected] Subject: [AFMUG] Bigger batteries for Smart UPS I'm getting a bigger unit - SmartUPS XL 2200 - and I'm looking at batteries. I have an Interstate Batteries and Batteries Plus near me so I'd like to go with either of them. This will be indoors. I'm aiming to get 280 watt hours (70 watts, 4 hours) of run time. Is there any idea as to the inefficiency of the whole AC/DC/AC/DC process? What type of battery would be best? Should I look for 12/24/48v batteries or does it matter (besides having to connect them in series)? Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373
