Weather Adjusted Power and Energy show you how much energy your system should have produced given the weather it actually experienced, not a fixed, generic expectation. This article explains where to find Weather Adj. values on the Daily and Monthly/Yearly views, how to read the related metrics, and how to use them to tell a real performance issue apart from a simply cloudy day.

Weather Adj. is a physics-based benchmark calculated for your exact system. It takes the irradiance and temperature your site actually experienced, combines it with your system's own hardware, geometry, and configuration, and calculates the energy a healthy version of your system should have produced under those exact conditions.

This is different from the static "Expected" value, which reflects a fixed design-based estimate and does not know whether today was sunny or overcast. Weather Adj. answers a more useful question: given today's actual sky, was today's energy what the sky promised? Comparing your Actual production to Weather Adj., rather than to Expected, tells you whether a dip is a real problem or just the weather.

Follow these steps to view Weather Adjusted Power alongside your system's actual output for a single day.

Step 1: Open the System Analysis page and select System from the left-hand panel.

Step 2: Set Period to Daily and use the date picker to choose the day you want to review.

Step 3: In the metric picker, add AC Power, Irradiance (Main), and Weather Adj. Power so all three plot together.

Note: The shaded area between the AC Power line and the Weather Adj. Power line marks the performance gap for that interval — the wider the shaded area, the larger the shortfall against what the weather actually allowed.

The metric bar above the chart summarizes the day using the values below (example from the 2026-08-10 screenshot above).

Weather Adjusted Energy is the accumulation (sum) of Weather Adj. Power across every interval in the period, so the same comparison works over a month or a year, not just a single day.

Step 4: On the System Analysis page, change Period to Monthly or Yearly and use the date picker to choose the month or year you want to review.

Step 5: In the metric picker, select System Energy and Weather Adj. Energy to compare the two bar-by-bar.

Note: Bars only appear for days that already have data. In this example only August 1 through 10 have measurements, which is why the rest of the month is empty — this is expected for a month still in progress.

Weather Adjusted Production is recalculated for every 15-minute interval using the site's actual weather and its own configuration. The table below summarizes the stages of the calculation.

Because the calculation is grounded in physics, it is only as accurate as the system specification captured when the plant was set up — this is the basis for the Important note above.

Here's how to read a few situations you're likely to see in your own data.

"My production dropped this week — is something wrong?"

Open the Daily or Monthly view and compare your Actual value to Weather Adj. for that period. If the two are close together, your system performed as well as that week's weather allowed — nothing is wrong, you simply had less sun to work with.

"My production looks normal — could something still be wrong?"

On an unusually sunny stretch, your Actual and Expected values can both look healthy while Weather Adj. is noticeably higher than Actual. That gap means the extra sunshine is masking a real issue, such as soiling or a failed string, that's quietly costing you energy. Always check your gap against Weather Adj., not just whether Actual looks "good" on its own.

What the shaded area on the daily chart means.

In the daily example earlier in this article, the shaded area between roughly 10:00 and 13:00 shows Weather Adj. Power running above AC Power. Irradiance was strong during that window, so the system underperformed by about 4.1% against what the weather allowed that day. The ± and cloud-icon metrics in the summary bar quantify exactly this gap for you.

Spotting a trend over time, not just one bad day.

If you're trying to tell a single bad day apart from an ongoing problem, switch to the Monthly or Yearly view. If your System Energy bars fall consistently and increasingly below the Weather Adj. Energy bars across several days, that's a stronger signal of a real, developing issue rather than one cloudy day.

"Why did my production briefly look better than expected?"

Look at the chart below, around 09:00-10:00: AC Power (green) briefly rises above Weather Adj. Power (purple, dashed), highlighted in green instead of the usual shortfall shading. This isn't overperformance — it's a sign that the site's irradiance sensor was partially shaded at that time of day, for example by a nearby structure at a low morning sun angle. Because Weather Adj. Power is calculated from the sensor's measured irradiance, a shaded sensor reads lower irradiance than the panels actually received, which pulls the Weather Adj. expectation down and makes Actual output look artificially high by comparison.

Note: If you notice Actual consistently exceeding Weather Adj. at the same time of day, it's worth checking whether something is casting a shadow on the irradiance sensor at that sun angle, rather than assuming the system is over performing.