This thing is incredibly small. The module I received does put out 13.4V@1.5A which is acceptable. It does switch between the battery and AC power without dropping. It does have overcurrent protection that functions properly. It does provide 13.4V to the battery to charge it which is a little low. Its no load draw is too low for my Kilowatt meter to read accurately. With a 1.5A load it draws about 40VA/25W (No Battery) 80% efficiency which is ok. It does get a bit warm which could be the 5 watts lost. My application is to support a USB charger running a Raspberry Pi and a few network components. (I doubt seriously that it's 20 watts.) I bought this units bigger brother if I have issues :-)
