Lamar Owen wrote:
If someone would like to donate a midsized 208VAC-capable (single-phase OK, but has to be 208 and not 240, or at least jumperable) UPS to the effort, about a 3000VA unit or so, that would help matters considerably! All my good UPS's are 120VAC at this point (my one good 208VAC unit threw a battery a few weeks ago; 8 12-270 UPS batteries will blow my equipment budget right now...
I've gotten away with running some 208V equipment on a 120V UPS using a step-up transformer which had a 208V tap (and 220V, 240V). Of course, 3000VA is going to require a 120V 30A outlet to power said transformer (and a UPS with 30A output probably needs a 50A circuit to feed it).
what size are those 12-270 batteries? I replaced the 12V 17AH batteries in a SmartUPS 2000 with Panasonic 12V 20AH from www.Digikey.com for relatively cheap. (googles, oh. 12V 75AH monsters, online looks like $125 each).
Another alternative is to get Marine/RV batteries from Costco or similar discount store, 12V 100AH for about $50 each, and string them in series external to the UPS. you need to use VERY heavy gauge wire for this, like automotive jumper cable diameter. I'd put said batteries in a series of battery boxes, and install the whole mess some place like the basement, with ventilation to prevent accumulation of hydrogen fumes.
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