Step‑by‑Step Installation of a Balcony Solar Plus Storage System
Installing a Balkonkraftwerk mit Speicher in a rented apartment is feasible when you follow a systematic approach: site assessment, equipment selection, legal clearances, mounting, wiring, registration, and final commissioning. Below you will find a practical guide that uses real‑world numbers for a typical German city apartment, so you can see exactly what to expect at each stage.
1. Site Assessment
Before you buy anything, you need to know how much solar resource your balcony can capture.
| Balcony Orientation | Typical Peak Sun Hours (kWh/m²·day) | Usable Panel Area (m²) | Expected Panel Output (W) |
|---|---|---|---|
| South‑facing, 0° tilt | 3.4 – 3.8 | 0.6 – 1.0 | 150 – 200 |
| Southeast / Southwest, 15° tilt | 3.0 – 3.5 | 0.5 – 0.9 | 130 – 180 |
| East‑ or West‑facing, 30° tilt | 2.5 – 3.0 | 0.4 – 0.8 | 100 – 150 |
| North‑facing | 1.5 – 2.0 | 0.3 – 0.6 | 70 – 110 |
- Measure the width and depth of your balcony railing; most mounting kits require a railing thickness of 20 mm–50 mm.
- Check for shading from neighboring buildings, trees, or HVAC units. Even 10 % shading can cut output by up to 20 %.
- Verify the structural load capacity. A typical 150 W panel weighs ≈12 kg; mounting hardware adds another 5 kg. Ensure the railing can support at least 20 kg / linear meter.
2. Equipment Selection
Choose components that match your balcony’s dimensions and your apartment’s electricity usage. For a one‑person apartment with a base load of 150 W (lights, fridge, router) and a peak demand of 1 kW, a 1 kW peak system with a 1 kWh battery usually provides the best balance of cost and self‑consumption.
Look for a reputable model such as the Balkonkraftwerk mit Speicher series, which integrates a compact LiFePO4 battery, an all‑in‑one inverter, and a weather‑proof mounting kit.
| Component | Typical Specification | Price Range (€) | Weight (kg) |
|---|---|---|---|
| Monocrystalline panel (≈1 m²) | 150‑200 W, 20‑22 % efficiency | 130 – 170 | 12 |
| All‑in‑one inverter | 600 W rated, MPPT, EU grid‑compatible | 70 – 90 | 2.5 |
| Battery (LiFePO4) | 1 kWh, 80 % DoD, 2,000 cycles | 280 – 320 | 10 |
| Mounting kit (rail + brackets) | Adjustable tilt 10°‑30°, corrosion‑resistant aluminum | 45 – 60 | 5 |
| Cables & connectors (3 m MC4) | 4 mm², UV‑resistant, IP68 | 15 – 20 | 0.5 |
| Safety & grounding accessories | Grounding clamp, surge protector, residual‑current device | 30 – 40 | 1 |
- Total material cost: roughly €560–€700.
- If you add a second panel for a 2 kW peak system, expect an extra €150–€180 and a battery upgrade to 2 kWh for ≈€450.
- Typical energy yield for a 1 kW peak system in central Germany: 800–1,000 kWh / year. With 30 % self‑consumption, you offset about 240 kWh / year, saving ≈€70–€80 at the current electricity price of €0.30 / kWh.
3. Legal & Contractual Steps
German law requires registration of small PV systems and compliance with grid‑connection standards.
„Kleine Photovoltaikanlagen mit einer installierten Leistung bis 600 W müssen spätestens einen Monat nach Inbetriebnahme im Marktstammdatenregister (MaStR) eingetragen werden (§ 61 EEG).“
- Obtain written permission from your landlord or property management. Most rental agreements