Practical knowledge about photovoltaics, self-consumption, storage and profitability.
Planning a PV system in 2026: Current EEG feed-in tariff rates, the planned phase-out of solar subsidies from 2027, rising electricity prices due to the Iran conflict — all the facts for your decision.
Calculating solar PV profitability: all factors, a sample calculation & tips on recouping your investment in 2026. Get informed and start planning now!
Optimise PV self-consumption: with these 7 proven tips you can raise your energy self-sufficiency to up to 80%. Load shifting, battery storage, heat pumps and more.
Calculate battery storage size: how to determine the optimal storage capacity in kWh for your PV system -- with rules of thumb and a worked example.
Solar PV return on investment calculator: Calculate your ROI with our step-by-step guide. ROI formula, key factors & worked example for 2026.
Commercial solar PV: Find out when photovoltaics pays off for businesses, what tax advantages are available, and how to permanently reduce your electricity costs.