Had 2 weeks, bought from US Distributor on Amazon. Got it in 3-4 days. I have a Sub-Panel with a fail-over Contacter in my home that feeds all the 120V Circuits. This 24v/120v 3500W Inverters runs everything. Is Pure sine Wave, Mine seems to be 90% eff. Will easily start a 15,000 BTU Roof AC Unit in RV. . Replaced my 2000 Watt Inverter. Cables that come with Unit seem to be for low amp testing. Bought 2/0 3ft cables from HF to carry the load. Now I need some more batteries.