Overview

• New guides highlight Nachteinspeisung using add-on batteries that store daytime output for night use, with tested units like Solakon ONE reviewed at 94/100 and expandable from 2.11 to 12.66 kWh.
• Owners can boost yield by adding panels, running additional mini systems on separate phases, or fitting storage, but expansions must respect the 2,000 Wp module and 800 W feed-in caps to retain simplified rules.
• Retailers now market higher-capacity starter packs, including advertised 4,000 W sets with modular storage, which are technically feasible but are treated as full PV systems with standard registration and installation requirements.
• A CHIP.de profile of a DIY build reports roughly 30 kW PV with a 100 kWh LFP battery for under €25,000 in materials, illustrating falling hardware costs and high self-sufficiency claims.
• Larger installations face extra costs and equipment, with systems above 25 kW requiring a load-control receiver estimated at €700–€800 plus potential distribution-board upgrades and compatible smart metering.