Mark,

If you look at Dessalator specs you'll see that it does operate much more efficiently at 24v vs 220v.

https://www.dessalator.fr/en/products/price-list/

For my Duo100, operating at 220v uses nearly 60% more wattage than operating at 24v. Moreover, inverters aren't 100% efficient so I try to go 24v whenever possible.

BTW does your 160l/h actually produce 160l/h? The gauge on mine will show 100+ but measuring via the floating dipstick shows the tank is only getting 80l
--
Scott 
2007 A54 #69
SV Tengah
http://www.svtengah.com