Hi Keith, I have a $80 PowerTeck inverter its 400watt continues and 1200watt surge it ran my Makita 25 minute battery charger easy till the ants built in it and it shorted out, I replaced it with another but it takes an hour to charge the same 3 hour battery, but the inverter runs it as well, used the inverter to charge the batteries a fair bit up the Cape last Year, Craig