As much load as you can shift to daytime, is good. That means you are running directly off sunlight at about 77%, and not recharging batteries, which is only about 50% You get almost 25% more free power load shifting to daytime use.
Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
That's assuming she has batteries to begin with, which isn't indicated in the original question.
Assuming it's a grid tie system, it wouldn't matter WHEN you used the power, UNLESS you have day/night differential rates. If you do have that type rate structure, I'd use as much use in off peak hours, and let the sun run the peak meter back the most.
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