SUNEx Solar



Will a solar array produce electricity during a power outage?

Yes, an Automatic Transfer Switch (ATF) will be installed with your solar system allowing itself to isolate from the grid and directly power your facility while the sun is shining.

What About Shading and Shadows?

We evaluate each site using the Solar Pathfinder system. This allows us to determine any losses in production due to shadows.

How much space do I need for a large Solar System?

In general 4-5 acres is required per megawatt.

How big is a solar array?

For every 1000 DC watts, there are about 75 square feet of panels. So a 10 kw array will be about 750 square ft (20 x 38 ft) 

What about snow in the winter?

It depends on the panel tilt and local conditions. Areas exposed to wind with tilt angles 45 degrees or greater will shed most snow. Other systems will require an occasional brush-off for maximum output.  Only about 15% of annual solar production is during the snow periods and snow will only cover panels for a fraction of those days.  A tracking array "dumps" snow every morning before beginning its tracking routine.

How long do Solar PV Systems last?

The panels last at least 25 years, probably over 35 years. The inverters last from 10-20 years. Then they can be refurbished or replaced. Replacement cost is $0.20 to $0.25 per watt for inverters.  Solar panel output deteriorates about 1/2 percent per year in northern climates. Racking components are aluminum, stainless steel, and galvanized steel. Some ground array structural components may be pressure treated wood.

How do I get paid for electricity with Net Metering?

Net metering credits your account the difference between what the system returns to the grid vs what you use from the grid. In most cases, energy is charged and credited at the same retail rate for both.  If you return more that you use you are credited with Net Excess Generation (NEG). NEG credits do not have an expiration date.  Current retail rate is about 12 cents per kwh. A sample netmetering bill from Cherryland is here.

Frequently Asked Questions