Hi,
the 50KWH per day is realistic measurement.
I have 2 Hayward pool pumps 1HP (1600W) and 1.5HP (2200W) and run them occacionally on inverter (one at a time as inverter is max 3500W).
My 6,7KW solar plus 6KW Windturbine system is still falling 400-500KWH a month short to power the entire house (Fridges, Aircon, waterpumps, poolpums etc..).
Rating Watt of PV modules is a laboratory value at 20C temp, working temperature is more 70C with much lower Voltage output... so my 80W peak rated module (4.4 Amp * 18V) delivers more 4.4A * 15V = 66W.
So yearly average for Boston area I would more set to 3hour/day of rated Watts.
Using alternative energy for 50KWH would mean 16.6KW PV array. There are several modules in 165W to 167W range for around 700$ and you would need 100pc of them = 70k$ !!
Plus some grid intertie inverters (6 Sunnyboy 2500W or 4 Trace SW5500GTI) another 12k$, plus mounting frames, breakers, wires etc... ending up with 90,000$ investment to knock out the poolpump consumption from your electric bill.
This is yearly average so in summer you produce more than you need (does the utiliy comp buy this back ?) in winter you buy some power from them.
The utility companies charge on average 8cent/KWH = 1500$ a year.
Amortisation of 90k would take 60 years then.
Optimistic scenario with 4h rated Watt per day is still a 70k$ system.
When you are in a remote area and want to use an island solution with large battery bank the system will cost you above 110k$ - so amortisation against an Diesel generator looks similar bad.
