Technically in this article the guy isn't really "building" a UPS...He is connecting an off-the-shelf inverter to a bank of batteries. I did something similar to this with mixed results. The results definitely vary depending on the quality of the inverter you use. I used inverters from a company called "Dimensions Unlimited". As these setups failed I just replaced them with UPS units from APC. I still get about 30 minutes to an hour of runtime from the APC units. The inverter and battery setups were just way too bulky for the limited space I had available.
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Technically in this article the guy isn't really "building" a UPS...He is connecting an off-the-shelf inverter to a bank of batteries. I did something similar to this with mixed results. The results definitely vary depending on the quality of the inverter you use. I used inverters from a company called "Dimensions Unlimited". As these setups failed I just replaced them with UPS units from APC. I still get about 30 minutes to an hour of runtime from the APC units. The inverter and battery setups were just way too bulky for the limited space I had available.