I've run my 5W projector which is pretty heavy on juice thanks to the Dual Green DPSS on a 1500VA Eaton PowerWare for 30mins no problem at all with plenty of juice left. In fact will be doing exactly this again next weekend so can plug the laptop into the UPS & see exactly what its pulling. This is a decent UPS & I trust the output of it a lot more than a cheap genny or inverter.