Overview

• Retailers are promoting a 1,000 W “Duo XL” kit from Kleines Kraftwerk for €339, bundling two 500 W panels with a Hoymiles 800 W inverter and cabling, with optional mounts offered for €99.
• Flexible 225 W TOPCon modules marketed by Kleines Kraftwerk weigh 4.5 kg, measure 0.3 cm thick, carry an IP67 rating, and are advertised to deliver up to 30% more yield in overcast conditions according to the vendor’s claims.
• Product ranges now span starter 450 W sets at €319, larger 900–1,800 W configurations from €529, and AC‑coupled storage bundles from €1,499 featuring an Anker SOLIX Solarbank 2 Pro (1.6 kWh) and a included smart meter.
• Germany counts more than 1,000,000 registered plug‑in balcony PV systems, reflecting the technology’s broad adoption.
• A long‑running installation by Holger Laudeley has operated since 2007, producing roughly 850–1,000 kWh per year despite shading and yielding several thousand euros in cumulative bill savings.