10-19-2017, 12:56 PM
Nice, I use one of those converters on my 24v solar setup at home to run a 12v water pump and some LED lighting.
A box fan typically uses 60-100 watts. A small Ryobi battery is 1.5Ah @ 18v, so 17 Watt hours * 0.80 (efficiency of your buck converter and inverter probably) = 13.6 Wh. So your fan should run on low a little over 4 minutes on a full charge. Maybe less, not sure if lithium-ion has the Peukert effect like lead-acid.
A box fan typically uses 60-100 watts. A small Ryobi battery is 1.5Ah @ 18v, so 17 Watt hours * 0.80 (efficiency of your buck converter and inverter probably) = 13.6 Wh. So your fan should run on low a little over 4 minutes on a full charge. Maybe less, not sure if lithium-ion has the Peukert effect like lead-acid.