Found these 24V 1500W pure sine inverters on Surplus Center. It dosn't seem like an unreasonable price for 1.5KW pure sine, but I know nothing about the manufacturer...
http://www.surpluscenter.com/Electrical/Power-Supplies/Inverters/24-VDC-1500-WATT-COTEK-POWER-INVERTER-6-1022.axd
http://www.surpluscenter.com/Electrical/Power-Supplies/Inverters/24-VDC-1500-WATT-COTEK-POWER-INVERTER-6-1022.axd