Solar 101 Sessions

Join us for our Solar 101 Sessions! Learn the basics on how solar works and be eligible for Group Buy Discount pricing!

RSVP and see more details on our Events page.


What Makes A Good Solar Site


The ideal site for a solar array in southern Indiana is a south facing roof pitched at about 32˚. The site should have little or no shading and be close to the electric meter for the property. However, roof pitch can vary from flat to 45˚ and panels can be mounted on east or west facing roof. Solar arrays can also be mounted on the ground if roof space is unavailable.

Solar Panels


Whole Sun Designs Inc. has worked on a wide variety of solar power systems including: solar electric (with or without batteries), solar thermal, passive solar home design, and hydronic/radiant flooring heating systems. While we have the ability to work on a wide variety of designs, our focus is on grid-tied solar electric/PV systems for residential and light commercial. By focusing on what we do best, we can provide personal service and fine craftsmanship to ensure maximum production of your system for years to come.

Energy Efficiency


Energy efficiency is the first step in bringing down your utility bills. Simple tasks such as changing light bulbs to LED’s, adding pipe insulation and an insulation blanket to a hot water heater, and caulking windows can be accomplished by anyone with basic handy(wo)man skills. Other tasks such as adding attic or wall insulation, upgrading appliances and HVAC equipment, and replacing windows may need to be contracted out to professional. Either way, these are good investments for energy savings. Task of the Month programs are coming to encourage group efforts in energy efficiency.

Kilowatt Hour


Watts or Kilowatts (W or kW) - Used to measure rate of energy use or production. Light bulbs are rated as 100 watts and solar panels are rated as 250 watts. One 250 watt solar panel can power two and a half 100 watt light bulbs or five 50 watt light bulbs.

Kilowatt Hours (kWh) - Measures total energy used or produced over a certain time period. A 100 watt light bulb on for 10 hours uses 1 kWh, while a 250 watt solar panel in the sun for 4 hours produces a 1 kWh utilities charge based on kWh usage.

Dollars per Watt ($/watt) - A common way to price solar arrays. The total DC wattage of the solar array divided by total system cost compares apples to apples.

Utility Bills


The first step in sizing and pricing your system is to look at your utility bill. Ideally, we would gather the last twelve months’ bills in order to add up annual usage in kilowatt hours (kWh). Many bills also have a graph showing the previous year’s usage. From there, we have a simple formula to size a solar array based on your usage and price it based on system size.

Return On Investment


Generally, solar arrays in southern Indiana are going to pay for themselves in 8-10 years, while panels are warrantied for 25 years. However, every system is different. Sending us a copy of your utility bill is the first step in getting a personalized quote for your home or business.



Online monitoring is standard on all systems. With power optimizers, we can monitor production details at the panel level. This simplifies ongoing operations and maintenance of the system and makes troubleshooting easy. You will have access to system monitoring from any smart phone, computer, or tablet through the manufacturer’s website.



Whole Sun Designs