LOL! Lawnmower Missiles.. That never entered my mind..
Sounds like you have a pretty good setup going.. 1.77 kW?
I'm still toying with the idea of putting my 48v battery backup system to use..
It's a shame it's just sitting there, waiting for a grid fail..
I saw a neat little inverter that I might want to hook up to my 48v bank
and plug into the A7 hotwater ASHP..
Waterproof Grid Tie Inverter IP65 300W Pure Sine Wave Inverter 22V 50VDC 110VAC | eBay
Looks like a clone of an Ephase product, but at 120vac..
At 300w it's not much, but it will be a good assist to the A7 and not kill the 48v bank too badly..
At night or on overcast days, the A7 turns on and runs like a 6,000 BTUh AC, sucking up a few KWh..