Integrated Power Systems > Sizing Your Grid-Tie System

Now that you know the basics, the next decision is:

“How Big Should I Go?”

The following formula will give you an approximate system wattage so that you can get an idea of cost and components needed for your system. Work with our experienced team at IPS to design a system which fits within your budget and can be expanded as needed.

1.  How much electricity do you use each month?
Look at your electric bills from the past year and find the average number of kWh per month then divide by 30 (days in a month).
2. How many peak sun hours do you get per day? Most of Southern BC receives 3.5 hours on an annual average. Outside this area, refer to   Sun Hours chart on page 7.
3. What % of your home/business power usage will be supplied by renewable energy from your system?

This will give you your minimum system size (MSS) in watts.


The MSS is the number of watts per hour your system needs to produce during peak sun hours in order to meet your needs. You can use this number to figure out the appropriate system size.

Note: These figures are approximate and do not take into account variable efficiency ratings of the solar panels or inverters.

Grid-Tie chart

Vernon, BC
Vernon, BC


3.5 hrs is the average annual full sun hours per day

Full sun hours = 1000 watts per meter squared per hour


Please Note: In the following Grid-Tie systems, the solar array wattage is only an approximation as solar panel wattage changes with availability.

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