Solar panel and inverter compatibility checker
Before you buy panels for an inverter, check that they fit. Enter the numbers from the two datasheets and your coldest morning, and we test the same limits an installer checks: cold voltage, working voltage, current and power. The values shown are only examples, so replace them with your own.
Results
Fits within the limits6 panels, 3,270 W. With these datasheets, 4 to 9 panels in series stay inside both voltage limits.
Cold open-circuit voltage
305 V · at most 500 V
Panel voltage rises when it is cold, and is highest at sunrise with no load. Above the inverter's absolute maximum it can be destroyed, so this is the check that matters most. Fewer panels in series lowers it.
Hot working voltage
220.5 V · at least 125 V
Hot panels produce a lower voltage. If the string falls below the tracking window the inverter cannot harvest it, usually in the afternoon heat. More panels in series raises it.
Cold working voltage
253.9 V · at most 425 V
Above the tracking window the inverter cannot follow the maximum power point, so you lose some output on cool mornings. It is not dangerous.
Working current
13.2 A · at most 22 A per input
Parallel strings add their current. Too much current is clipped, which wastes panels, and sustained overload can overheat the input.
Short-circuit current (with 25% margin)
17.4 A · at most 30 A per input
The inverter must survive the panels' worst-case current, which is the datasheet short-circuit current with a margin for strong sun.
Array power against input limit
3,270 W · up to 6,500 W
A little oversizing is common and loses only a few hours of peak output. Far beyond the input limit is mostly wasted money.
Temperature scaling uses the Voc coefficient for all voltages, which is slightly conservative for working voltage. This tool does not check cable size, protection devices, earthing or mounting.
What next?
Not sure how much you need? Try the solar and inverter size calculator. When you are ready, browse the free directory of installers and ask one to confirm your design in writing.
This guide is general information, not engineering, electrical or financial advice. Have a qualified, experienced installer assess your home or business, and follow local safety rules and the supplier's instructions.
Frequently asked questions
How many solar panels can I connect in series?
As many as keep the string's open-circuit voltage, measured at the coldest morning, below the inverter's absolute maximum PV voltage, while keeping the hot working voltage above the bottom of the inverter's tracking window. This checker works out both limits from the datasheet numbers.
Why does cold weather matter in Nigeria?
Panel voltage rises as the panel gets colder, and it is highest in the first light of a cool morning before any load is connected. Harmattan and highland areas such as Jos can be cool enough to push a long string over the limit, so the checker lets you set your coldest morning temperature.
Where do I find the numbers?
On the datasheets. For a panel look for Voc, Isc, Vmp, Imp and the temperature coefficient of Voc. For an inverter or charge controller look for maximum PV input voltage, the MPPT voltage range, maximum input current and maximum PV power. The sample values shown are only examples.
Is a pass a guarantee that my system is safe?
No. This tool checks the main electrical limits but not cable sizing, protection devices, earthing, mounting or the rest of the design. Have a qualified installer confirm the design before you buy or connect anything.