Frequently Asked Questions: Pre-Installation

My roof faces east, can I still install solar?
To maximize output, the panels should be facing magnetic south.  If you live in California, magnetic south is actually SE.  So if you live in California, and your roof faces SE, you can put panels on that portion of your roof.  In New York, magnetic south is SW so an eastern-facing roof would not be optimal and a ground-mounted system would be better.  Please contact NPCP to determine if your roof is suitable for solar.

I can’t put solar on my roof.  What do I need to do to install a ground-mounted system?  Is there an additional cost?
The additional cost for a ground mounted system is the structure needed for the ground-mount (basically, what your roof provides as a structure).  Please visit our page on the John O'Conner Installation to see photos of ground mounted systems and possible design ideas for the ground mount structure.

Can I angle the panels to face south to maximize my output?
No.  The SRS mounting system must be mounted flush to the roof portrait style (meaning the longest edge of the panel is vertical). 

How should I string the panels?
Each system is different.  Please visit the SMA website to determine what the maximum and minimum number of panels are needed for each inverter.

What materials do I need to buy that are not included in the kit?
AC/DC Disconnect switch, wiring back to the electrical service, electrical permits, flashings (flashings can be added to the kit).  Approximate cost of items not in kit is $200 to $800 depending on the size of the system.

How much space do I need to install a system?
Rule of thumb, 100 sq. feet (conservative – 120 sq. feet) of usable roof space can facilitate 1kw of solar.

Are roof flashings required for my system?
Some state, cities and Utility companies require that flashings are installed with the system, however most do not.

Will flashing increase my output?
By creating more space between the solar module and the roof and allowing more airflow, flashings can increase total output up to 3%.

How much solar electric power do I need to power my home?
Each home is different, and the amount of electricity that you use is dependant on where you live, your lifestyle and your appliances etc. To gain a better idea of what size system would work best for you, please send your utility bill to: Chris Knight or Samara Levine.

What happens to panels when they are shaded?
Even the smallest amounts of shading on the solar modules can significantly reduce the output. Shading can be reduced by trimming nearby trees or shrubs.

Why should I install solar?
It’s simple. Electrical rates are increasing at an average rate of 5% per year. By installing a solar electric system you are fixing in your electrical rate for the next 25 years. Why rent electricity from the utility company when you can own it!

Do I need a combiner box?
If you are using the SMA 1800, 3000, 4000, 5000 or 6000, you do not need a combiner box. Above the 6000 W inverter, a combiner box is optional.

What type of electrical service do I need to install a system?
In the United States, most residential and small commercial service are 120/240 and 120/208 respectively. The spec sheet for each inverter identifies the different voltages relating to each service. Therefore, any service in the United States is compatible with this type of system as long as you are grid connected.

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