Numbers for this period
PR compares what your panels made with what panels their size would make in the sun they got, if nothing were lost. Heat, dust, wiring and the inverter always take some, so real systems sit below 1.00. Healthy is 0.75 or more.
Two low months in a row
Questions to ask: has anything shaded the panels, are they dirty, and what does the inverter's fault log say? A cloudy stretch can do this too, so check the weather first.
We wait for a second low month before raising a flag, because satellite sun data can be off by 5 to 10% for a single month.
Weather or system?
The weather check did not get through, so the PR above is still against a typical year's sun. Check your connection and use "Try again" below your bills.
Not checked yet. Tap "Check the weather" (below your bills) to compare. The PR above is against a typical year's sun, so a cloudy month can read low even when the system is fine.
The weather index is the sun in this period divided by the sun for the same dates in a typical year (the average of 2020 to 2025). 1.00 is typical. Below 1.00 is cloudier than usual.
- Weather index
- PR adjusted for that weather
- Below a typical period by
- Left for the system to explain
You produced at or above a typical period at PR 0.75, so there is no shortfall to split.
How much solar you used yourself
- Used in the house
- Share of your solar
- Whole-house use
What solar saved you
- Your buying rate
- Saved this bill
- Moving 1 kWh from night to noon is worth
Battery
Round-trip efficiency is how much of the energy you put into the battery comes back out. Some is always lost as heat, so it stays below 100% over a long run.
- Round-trip efficiency (out ÷ in)
- Whole-house use, worked out
- Battery earned this bill
Near or above 100% in one bill usually means the battery ended the period less full than it started. Look at a few bills together.
Decode this bill
- Bought from the grid. You bought . The charges that rise with kWh came to , an average of .
- Exported. You exported . The credit is paid at the generation charge only ( per kWh), not at the full price you pay for imports. Your export credit is . Solar you use at home saves more ( per kWh) than solar you export ( per kWh).
- After the credit. The credit covers of the variable charges.
- After the credit. The credit () is larger than the variable charges (), so nothing is left here: ₱0.00. SCND does not model the extra . See the note below.
- Why the bill is not zero. The remaining is fixed charges (such as metering and supply) and other charges outside the variable charges. Exporting more does not lower them. The credit only offsets variable charges, so the bill never reaches zero.
- The total does not match. Your total is below the left after the credit. Fixed charges cannot explain that, so recheck the numbers. See the note below.
- Nothing left for fixed charges. With the numbers you entered, the amount left after the credit equals the total. Bills usually carry fixed charges (such as metering and supply), so they may already be inside the variable charges you entered. If so, the price per kWh shown here reads slightly higher than the real one.
- Total. You paid .