Solar panel size and wattage: what one panel measures, weighs and makes here
The three current panels on this page are all 1,134 mm wide and between 1.8 and 2.4 meters long, rated from 480 to 670 watts. At San Fernando one of them makes about 2.0 to 2.9 kilowatt-hours on an average day.
Every figure below is read from three manufacturer datasheets and the Global Solar Atlas, and each one is worked through so you can redo it for the panel on your own quotation. Checked on 23 October 2026.
Solar panel dimensions and watts, from three datasheets
One small-format panel and two large ones, from two makers. They are here because their datasheets are public and current.
LONGi
Hi-MO X10 Scientist LR7-54HVH
- Cells
- 108 (6 × 18)
- Size
- 1,800 × 1,134 × 30 mm
- Panel area
- 2.04 m²
- Weight
- 21.6 kg
- Rated power
- 480 to 505 W
- Efficiency
- 23.52 to 24.74%
- Top rating per m²
- 247 W
JinkoSolar
Tiger Neo JKM580-605N-72HL4-(V)
- Cells
- 144 (72 × 2)
- Size
- 2,278 × 1,134 × 30 mm
- Panel area
- 2.58 m²
- Weight
- 27.0 kg
- Rated power
- 580 to 605 W
- Efficiency
- 22.45 to 23.42%
- Top rating per m²
- 234 W
LONGi
Hi-MO X10 Scientist LR7-72HVH
- Cells
- 144 (6 × 24)
- Size
- 2,382 × 1,134 × 30 mm
- Panel area
- 2.70 m²
- Weight
- 28.5 kg
- Rated power
- 640 to 670 W
- Efficiency
- 23.69 to 24.80%
- Top rating per m²
- 248 W
Drawn to one scale
All three are the same width. What changes from one class to the next is the length, and with the panels standing upright the length decides how many rows fit up a roof slope.
What the watts on the label mean
The rating is measured under standard test conditions, which all three datasheets spell out the same way: sunlight of 1,000 watts on every square meter, the cells held at 25°C, and an air mass of 1.5. Those are laboratory conditions. A panel working in sunshine runs well above that cell temperature, as the next paragraph shows.
Heat is the one to watch. The temperature coefficient tells you how much power a panel loses for every degree its cells run above 25°C: -0.26% per °C on both LONGi sheets and -0.29% on the Jinko. Both LONGi sheets print a nominal operating cell temperature of 45°C, and at that temperature the 108-cell panel gives up about 5.2% of its rating to heat alone. For what a panel makes on an average day at each town, use the atlas’s yearly output in the table below.
Efficiency is the other number on the sheet, and it is simpler than it sounds: the share of the light landing on the whole panel that leaves as electricity. A more efficient panel puts more watts on the same square meter. Across these three the top rating works out between 234 and 248 W per square meter, so on a cramped roof the cell technology matters more than the size class.
What one panel makes in a day, town by town
The Global Solar Atlas gives the long-term average output of a kilowatt of panels at any point on the map. Multiply it by a panel’s rating and you have what that panel makes on an average day there. The five points are the ones the rest of this site measures, read on 23 September 2026.
Kilowatt-hours a day
| Point | Per kW | 505 W | 605 W | 670 W |
|---|---|---|---|---|
| San Fernando Pampanga | 4.26 | 2.15 | 2.58 | 2.85 |
| Malolos Bulacan | 4.13 | 2.09 | 2.50 | 2.77 |
| Balanga Bataan | 4.28 | 2.16 | 2.59 | 2.87 |
| Tarlac City Tarlac | 4.34 | 2.19 | 2.62 | 2.91 |
| Olongapo | 4.16 | 2.10 | 2.52 | 2.79 |
Daily figures in kilowatt-hours, averaged over a year: per kilowatt of panels, then for one panel at the top of each model’s range, 505 W, 605 W and 670 W. A month is about thirty of these days: a 670 W panel at San Fernando comes to roughly 86 kWh. Shade, a roof facing away from the south and dust all pull a real roof below these.
Small panels or big ones
On a big, plain roof the larger class needs fewer panels for the same power, and so fewer clamps and connections. Three 670 W panels come to 2,010 W; it takes four of the 505 W panels, 2,020 W, to match them.
The small class suits roofs that are short from gutter to ridge, broken up by a water tank or a dormer, or reached by a narrow stair. At 21.6 kg and 1.8 meters it is the lighter and shorter panel to carry up and to fit around obstacles. Weight per square meter is about the same for all three, so neither class asks more of the roof per square meter.
The warranty lines matter as much as the size. Both LONGi sheets list 15 years on the product and 30 on performance, with a loss of no more than 1% in the first year and 0.35% a year after that, which leaves at least 88.85% of the rating at year 30. The Jinko sheet lists 12 years on the product and at least 87.4% at year 30. These are datasheet summaries; the warranty document itself is what binds, so ask for it with the quotation. How long panels actually last reads those terms against a field review.
What people ask about panel size and wattage
What is the standard size of a solar panel?
There is no single standard size. The three current panels on this page fall into two classes. The 108-cell LONGi panel measures 1,800 × 1,134 × 30 mm. The two 144-cell panels are longer: the Jinko 144-cell at 2,278 × 1,134 × 30 mm and the LONGi 144-cell at 2,382 × 1,134 × 30 mm. All three are 1,134 mm wide.
How many watts is one solar panel?
The three current panels on this page are rated from 480 to 670 watts. The 108-cell panel runs 480 to 505 W, the Jinko 144-cell 580 to 605 W, and the larger LONGi 640 to 670 W. The rating is measured under standard test conditions, which are laboratory conditions.
How much electricity does one solar panel produce in a day in the Philippines?
At San Fernando, Pampanga, the Global Solar Atlas expects 4.26 kWh a day from every kilowatt of panels on an average day across the year. A 600 W panel is 0.6 of a kilowatt, so about 2.56 kWh a day, or roughly 77 kWh in a 30-day month. That is a yearly average, so some days make less and some more.
Is a higher-wattage panel physically bigger?
Not within one model. Every rating of the Hi-MO X10 Scientist LR7-72HVH, from 640 to 670 W, measures 2,382 × 1,134 × 30 mm, and the higher ratings come with higher efficiency in the same frame: 23.69% at 640 W, 24.80% at 670 W. Between models, read the dimensions line on the datasheet. A cell count does not tell you the size: two other current 670 W panels, the JinkoSolar JKM670N-66QL6 with 264 cells and the JA Solar JAM66D50 GB with 198, are the same 2,382 × 1,134 × 30 mm as the 144-cell LONGi.
How heavy is a solar panel?
From 21.6 kg for the 108-cell panel here to 28.5 kg for the largest, which works out to about 10.6 kg for every square meter of panel. The rails and clamps that hold it come on top of that, and the roof page covers what a survey checks underneath.
Where to read next
From one panel to a whole system, and to the roof it has to sit on.
Tell us the roof and we will tell you which panel fits it
The town, a rough size of the roof and your monthly kilowatt-hours are enough for a written answer with a panel count and the panel class that suits the roof.
Tell us the property and what you are trying to cut, and you will get a written answer with a size and a next step. No visit is booked and nothing is charged for asking.
Sources: LONGi, datasheets for the Hi-MO X10 Scientist LR7-54HVH 480~505M and LR7-72HVH 640~670M, edition dated May 2026; JinkoSolar, datasheet for the Tiger Neo JKM580-605N-72HL4-(V), F8 edition, read 1 October 2026; for the cell-count comparison only, JinkoSolar JKM650-670N-66QL6-BDV, F4 edition, and JA Solar JAM66D50 GB, dated May 2026, both read 23 October 2026; Global Solar Atlas, the World Bank Group and ESMAP, on Solargis data, data version 2.2.68, read 23 September 2026. Datasheets change without notice, so check the one attached to your own quotation. The panels are named because their datasheets are public.