# How Big Should My System Be?

**Sizing Your InteliTrack Rail Tracking System**

To determine the best size for your ** InteliTrack System**, you need to know either the amount of energy (kWh) needed, or the size determined for a fixed-rack system.

**Sizing your system based on the energy required**

1. Determine the total amount of kWh required each year.

2. Use PVWatts (www.nrel.gov/rredc/pvwatts/grid.html) or another good database to find the number of kilowatts needed to meet the energy requirement.

3. Find the closest available site on the PVWatts map.

4. Select “2-axis tracking”.

5. Notice that the output is in ac kWh.

6. Subtract 2% from the number of kWh estimated by the database, to account for “back-tracking” early in the morning and late in the day – panels returning to “noon” position to avoid shadowing.

**Sizing your system based on the size of a fixed-rack system**

1. Find your location on PVWatts or another good solar database.

2. First enter “Fixed tilt” to estimate the amount of energy (kWh) produced by a fixed-rack system.

3. Then enter “2-axis tracking” and subtract 2% from the result, to get estimated performance of your **InteliTrack****System.**

4. Adjust the size of the **InteliTrack****System** to match the kWh output of the fixed-rack system.

**Sizing your off-grid system**

1. Size the system as described above.

2. But use December data rather than annual totals; that is, size the system for the lowest-output month.

**For help**

Contact us at 1.928.863.3245 or Info@SedonaSolarTechnology.com.