Solar system estimated output using RETScreen.net

RETScreen.net was used to estimate the amount of radiation received on the solar panels to estimate the yield we could expect for our systems. Here are the main input parameters:

• 4.9 kW of panels [20 panels that are 245 Solarworld panels
• 135 deg azimuth
• 40 deg slope on panels
• Guelph
•  5.0 kW inverter

The revenue would be the total annual 6.140 MWhrs at $802. Using 3.5% interest rate and a 10 year loan the system has a calculated simple payback of 6.9 years. Net revenue after 10 years is $9,000 and after 20 years is $55,000.

Month	Daily solar radiation - horizontal	Daily solar radiation - tilted	Electricity export rate	Electricity exported to grid
	kWh/m²/d	kWh/m²/d	$/MWh	MWh
January	1.67	2.74	802.0	0.375
February	2.84	4.13	802.0	0.505
March	3.70	4.40	802.0	0.584
April	4.53	4.64	802.0	0.580
May	5.63	5.30	802.0	0.667
June	6.31	5.74	802.0	0.682
July	6.13	5.66	802.0	0.687
August	5.28	5.24	802.0	0.637
September	3.88	4.24	802.0	0.509
October	2.59	3.24	802.0	0.415
November	1.36	1.81	802.0	0.234
December	1.25	1.94	802.0	0.264
Annual	3.77	4.09	802.00	6.140

I shall be comparing this with PVWatts in the coming days.