Here's my Renogy 1000W Pure Sine Wave Power Inverter. I have only had it a few months before upgrading my electrical system in my van to run a 2000W inverter. It only ever had light use - only using about 200w max in the van. It's practically as good as new with all original packaging and the instruction manual. It works fine with a decent 100aH Lithium phosphate battery. It has overload, overvoltage, short circuit, and under voltage protection and also can function as a mains UPS too. It also comes with some 100A rated 20mm2 cables ready for you to connect up to your van electrical system. You'll need a 150A fuse for the DC side on the inverter. I can post or offer local collection on this.
eBay