On quantum interferometer, I’ve always wondered if you could use it for navigation in space. Say you send a probe to another system. Navigating the uncharted system with precise gravity measurements that also expose its kinematics would be handy.
10kW on the roof and a Sanden heat pump hot water set to only run 9-5. I get credit from the Energy Australia for all the summer months which I spend on on the AC heat pump in winter. 25 year warranty on the panels and 20 on the micro inverters. The economics stack up.