Balcony Solar Kits — Side-by-Side

How to read the table

$/Wp is the price-per-watt-peak ratio — how many cents you pay for each watt of DC panel capacity. Below $0.60/Wp is excellent value (highlighted green); $0.60-1.00 is the typical range for kits with a real inverter and a sane mount; above $1.00 you're usually paying for either a battery or a premium brand. We sort by this column by default because it's the most useful single comparison number.

Peak W is the DC peak rating of the panel(s). Real-world AC output is capped by the inverter — so a kit with 900 W panels and an 800 W inverter delivers 800 W peak (the panels briefly exceed the inverter clip during cold-and-clear conditions). That clipping is fine and intentional; oversized panels improve shoulder-season yield.

Inverter is the AC output rating in watts. EU balcony rules (Germany, France, Italy, Austria, Netherlands, Belgium, Spain, Poland) cap this at 800 W; Switzerland sits at 600 W cantonal. Anything above 800 W AC will need a full grid-tied PV permit in those markets — see the country guides for the simplified vs full procedures.

Battery indicates whether the kit ships with integrated DC storage. Most plug-in kits don't — adding storage roughly doubles the kit price and reframes the regulatory regime (in many countries a kit with storage falls back to the full permit procedure even if AC output stays below 800 W). The economics rarely justify the added cost at these capacity levels; we recommend a no-battery kit for typical urban households.

Legal in reflects the brand's declared market list. An empty cell doesn't mean the kit is illegal in your country — it usually means the brand only ships from one warehouse. Many German-brand kits work fine in Austria or the Netherlands but the brand hasn't set up logistics for those markets.

When to pick what

For a renter on a single south-facing balcony, the cheapest 1-panel kit at the top of the value-sort list is the right answer. You get ~700 kWh/year out of an 800 W setup at central-EU latitudes, payback runs 2-3 years against current tariffs, and the railing- clamp mount comes off without a trace at end of tenancy.

For an owner with a large balcony or terrace, two-panel kits at 900-960 Wp DC pay back almost as fast as the cheapest 1-panel kits per-kit, but produce nearly twice the kWh — better absolute return on the same hours-of-installation. Cap remains at 800 W AC inverter, which clips the panels in midday peak summer (a ~5-8% annual yield loss; not a deal-breaker).

Battery kits make sense in only two scenarios: (a) you have a time-of-use tariff with a wide peak/off-peak gap (rare in most-EU markets currently), or (b) you have a grid-tariff structure where surplus is paid at zero or near-zero (post-2021 Vlaanderen, post-2027 NL). For everyone else the battery is a premium feature paid for in years of payback.

Going deeper

• Cross-country compare — same data but reorganised: ranks countries by payback time for the cheapest available kit.
• City directory — per-city PVGIS yield, useful when picking the right kit wattage for your latitude.