01-18-2022, 04:42 PM
(01-18-2022, 03:41 PM)danbrotherston Wrote:(01-18-2022, 03:03 PM)tomh009 Wrote: How much power do snowblower batteries put out? A short search showed that an electric lawnmower might use something like 800W under load.
800W would be very low for a snowblower (just over 1 HP). See below for information on wattage of battery units.
(01-18-2022, 02:26 PM)Bytor Wrote: 1,800W to be precise. Or 1,875W if your mains, like mine, test out at 125V. ;-)
Actually, the NEC and I believe our Canadian code matches it, limits the maximum continuous wattage of equipment on a 15A circuit to only 80% of the breakers capacity, so 1440W is the typical figure I hear.
But yeah, about 2 HP, rather anemic even from a low end gas blower.
Where as a high end battery unit could have 2 * 60 volt batteries * 7.5 amp hours * 5C discharge rate could easily draw up to 4500 Watts... or almost 6 HP which would be typical for a small engine in a snow blower. That being said, I couldn't find any figures on actual wattage for these units, so I have no idea how much of that capacity they are using.
Not sure you can compare power (gas) to power electric. Gas will provide consistent power regardless of load, while electric will suck more energy the harder it works.
I have a PHEV vehicle, and the battery is 8.9 kilowatts, and the electric motor itself is 60 hp. That nets you about 41 km on electric driving, give or take. Because it's a PHEV, the battery is only run down to 20%, then the car snaps into HEV mode. In the end, it works out to 173 watts to travel 1 km in EV mode, or 1.7 KW per 10 km in town. A gas car would likely take 1 litre to drive 10 km, in town, assuming no traffic. 1 litre of gas has 8.9 kilowatts of energy. My math: 4 litres gives you 40 km, and is 35.6 kilowatts of energy, while a typical EV would use 6.8 kilowatts for 40 km, making it over 5x as efficient.
Same rule applies to mowers, blowers, throwers, etc.