Overview
- German rules from the Solarpaket I allow high PV module peak power but cap plug‑and‑play feed to 800 watts, which forces systems to use batteries or internal throttling to avoid exporting more than 800 W to the house grid.
- A six‑month field test published by home&smart recorded 635.04 kWh generated from a ~1.76 kWp setup with a Zendure SolarFlow 800 Pro and about 566.67 kWh used on site, giving roughly 89.2% self‑consumption and an estimated payback of about four years.
- That same test found material real‑world storage losses: 349.44 kWh charged into the battery produced 269.10 kWh discharged, a roughly 77% round‑trip return, with conversion and standby losses reducing net savings.
- Retail offerings in 2026 cover low‑cost 800 W starter sets from about €200 up to complete storage‑equipped kits of €800–€1,500 and many 2,000 W bundles around €480–€645, while vendors also showed larger modular systems such as Anker's SOLIX Max at IFA 2026 whose German availability was not yet confirmed.
- Practical buying advice across tests and roundups is simple: size systems to match evening and night consumption because batteries drive cost and value, and weigh real storage efficiency and projected cycle life when estimating long‑term savings.