Estimate Your Requirements
You need to determine how many kilowatt hours of energy you use in a year to properly size a solar array.
- "View Billing History"
- "Billing History"
- "View Usage"
You should get a two year history of monthly usage.
Use this to determine your average annual usage.
Multiply your annual requirement / usage by 0.9 (90%) to determine the DC size of your system.
Example: If you use 10,000 kwh per year, you will need an 9,000 watt (9 kw DC) system to provide all your electrical needs.
Your monthly printed bill shows historical energy usage.
Be aware that Consumers has an "Energy over 600 kwh" program that raises the energy charge in June-Sept by 5 cents per kwh when your monthly usage exceeds 600 kwh. Look at the bottom of this page
for more details. The rate page is D-9.00
This premium needs to be used when calculating system payback.