It looks from the APC runtime graph that you should get 4 hours or close with the internal battery: http://www.apc.com/resource/include/techspec_index.cfm?base_sku=SU2200XL
You should be able to estimate runtime with different batteries from the information on that page or linked from there. From: Josh Luthman Sent: Tuesday, January 20, 2015 3:30 PM To: [email protected] Subject: Re: [AFMUG] Bigger batteries for Smart UPS 70 watt load. I'd like to get 4 hours. 280 watt hours. Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Jan 20, 2015 4:25 PM, "Gino Villarini" <[email protected]> wrote: The 2200 is 48vdc iirc, for a 289 watt load It will be inefficient... Better off with a 750xl Gino A. Villarini @gvillarini On Jan 20, 2015, at 5:17 PM, Ken Hohhof <[email protected]> wrote: APC charger is calibrated for AGM, doesn’t flooded require different voltages? Maybe I’m wrong about that. Certainly take out the internal AGM batteries, you don’t want batteries of different chemistry in parallel. I’ve only done it with external AGM, but as far as how you get to the right voltage (I forget if 2200 VA is still 24V or that’s the point where they started using 48V), I don’t think it matters if you put 2 x 12V or 4 x 6V in series to get 24V. I’m not sure you’ll find 24 or 48V batteries, the choices are usually 2, 6 or 12 volt. Make sure to put a fuse in each series string of batteries. From: Josh Luthman Sent: Tuesday, January 20, 2015 2:50 PM To: [email protected] Subject: Re: [AFMUG] Bigger batteries for Smart UPS Charger but also just an APC with the management. So far I've got two solutions: DC and APC. I'd rather avoid another model or method to monitor. Should I just load up on some decent size wet cell and wire them up? Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Jan 20, 2015 3:32 PM, "Ken Hohhof" <[email protected]> wrote: 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
