Articles

Which solar panel shops print prices with VAT and which without, market by market, and how to turn any shop price into a figure you can compare.

Length, width, weight, watts per square metre and per kilogram for every module in our catalogue, and what the common formats mean for roofs and lifting.

Yearly kWh, your site's yield in kWh/kWp and one module's power give the module count. Worked for Warsaw, Munich and Seville, with the catalogue spread.

A field by field guide to the solar module datasheet, with typical values from our catalogue and three arithmetic checks that catch a figure that is wrong.

When the back of a bifacial module pays off, ground mount or roof, how bifaciality factors are spread in our catalogue and what bifacial modules cost per watt.

How much cheaper per watt is a pallet or multipack of solar panels than a single module? Live shop offers, same shop and same module, with counts.

Temperature coefficient or NOCT in the hottest hour of the day, with a worked example, catalogue spreads and what a better coefficient costs in shops.

On a small roof or balcony, module size sets how many whole modules fit. A worked example with catalogue formats, efficiency bands and Polish shop prices.

How long solar module product and performance warranties run across our catalogue, how they differ by cell technology and maker, and what each one covers.

How far apart shop prices sit for the exact same solar module, measured on live offers before VAT, and what stock status and shop habits add to the gap.

What a rooftop solar module costs per watt before tax in each market, from live shop offers, with the spread inside each country and what it means for a buyer.

Why a solar panel rarely delivers its rated power, and how much heat, weaker light and power tolerance take away, from catalogue figures and PVGIS.

TOPCon or PERC? Efficiency, heat losses, warranted ageing and price per watt compared across our module catalogue and live Polish shop offers.

Where Voc and Isc sit on a datasheet, how far cold raises the voltage and heat the current, and which inverter limits they are checked against.

Which manufacturers state the longest product and performance warranties in our catalogue, counted per company with a minimum number of datasheets each.

Does a watt cost less on a bigger solar module? Live shop offers split into five power classes, in Poland and across markets, with spreads and shop counts.

Datasheet temperature coefficients grouped by cell technology across our catalogue, with medians, spreads and what the gap is worth on a hot roof.