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
I've not heard of them. Amazon only has a few reviews, but highly rated.
I've just ordered a new inverter for a in-law hut, with 5w idle . 24v/800va
http://www.victronenergy.com/inverters/inverter-12v-24v-48v-800va-3kva/
The cotek is 18w idle, which would be a lot over the course of a day 432whours vs 120wh Vectron Phoenix 800
I was thinking about one for an inverting generator with a very small engine sized for average load and a battery for surge capacity. Priced like that, they are almost getting into my experimentation budget range:)