An array is sized on the roof, and the facility's load keeps its own hours. We read a year of your 15-minute interval data against the inverter's output and say how much of the array you use, how much leaves at midday, and what you buy back after the sun goes.
148,908 kWh a year, 37% of the array, at midday and on closed weekends. 74 kW of load could run in the solar hours.
The array follows the sun and the facility follows its shifts. Wherever the two do not line up, the meter runs both ways in the same day.
Kestrel Park Distribution, the specimen warehouse in the scrolled story: a 250 kWp array on the roof, open 5 am to 10 pm on weekdays.
At noon the warehouse's roof makes 188 kW and the facility uses 96 kW. The other 92 kW leaves through the meter, and over the June weekday that is 470 kWh.
From 4:15 pm the array falls away just as the evening loads start. The facility buys 683 kWh back and sets its peak of 139 kW at 8:15 pm, with the sun already down.
One day shows the shape. The year shows the size, and the utility's own record carries it on a separate export channel.
The specimen warehouse's array, each month, as made and as exported.
Closed weekends export 68% of what the roof makes, because nothing is running to use it. Summer weekdays export at midday, and winter months export the least.
Over the year the warehouse uses 63% of its array on site and exports 148,908 kWh. Each kWh exported earns the export credit on your tariff, and each kWh bought back in the evening is charged at the evening rate.
Chargers, water heaters, chilled stores and pre-cooling, run in the solar hours on fixed rules. See Solar Load Shifting.
Sized in kWh and kW on the export that remains once the loads have moved. See Battery Sizing.
Where the export credit is close to the evening rate, exporting costs little. The study reads it off your own bill.
We take a year of your utility's interval data and put a meter on every board for a month.
We lay the array's output over the facility's load and read what leaves at midday.
We split the year into what was made, used on site, exported and bought back.
We name the loads that could run in the sun and what would be left for a battery.
Made, used on site, exported and bought back, month by month, in kWh.
From the utility's recordEach one with its kW, the hours it runs today and the hours it could run instead.
Reviewed by an engineerThe export that remains once the loads have moved, in kWh and kW, checked against the export register.
Read on the panelThe next step is usually Solar Load Shifting.
12 months of your utility's 15-minute interval data with its export channel, and the inverter's own production log. A meter on each board for a month says which loads draw when, and the meters come off again at the end of it.
Nothing on the array or the service is changed during the study. What a kWh exported is worth against a kWh bought back is read off your own tariff, so nothing here prices it for you.
