مقارنة الألواح الشمسية بقدرة 400–500 واط

Panels in this output class usually have 108 or 120 half-cells and measure around 1.7 to 1.95 metres long and just over 1.1 metres wide. Two of them fit on many balconies and together deliver the 800 to 1,000 Wp that make good use of an 800 W inverter. If you have more space, you can combine four panels up to the 2,000 Wp limit.

When choosing, look at dimensions and weight first. A glass-glass panel often weighs over 20 kilograms; the mount and railing must support that plus the wind load. Also check that the panel's open-circuit voltage and short-circuit current match your inverter's inputs.

The same buzzwords keep cropping up in product titles. Here's what they mean:

Large panels are often delivered by freight carrier or on a pallet. Check the shipping costs and whether delivery is to the kerb or into your home. Inspect the glass for cracks on delivery and document any damage immediately. Many offers are priced per panel, some as a twin pack – so always compare the price per Wp.

Many owners of older 600 Wp balcony power plants are upgrading today. If your inverter has free inputs or you swap it for an 800 W model, you can add more panels up to the 2,000 Wp limit. Where possible, buy panels with similar electrical values to your existing ones if they're going on the same input. Afterwards, update the panel output in the Market Master Data Register.