CA Traveler
Good question!
I had the Contactor in my parts bin while I looked at a $75.00 latching relay on the web. My Cheap self came through, why not use the one I have and live with the 1 amp coil draw after all it's only active when the inverter is powered up drawing 100 plus amps
That "saved" $75 quickly went away when I purchased a couple of factory scan tools GM Tech 2 and a Chrysler WiTech w/micro pod II
Otherwise YES the latching relays that offer a high enough continuous current rating are the way to go - they can even can be remote controlled - and as you state ZERO coil current draw after the switch