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01.07.2026
In short: Three of the most sought-after 5 kWh balcony storage systems in direct comparison: Anker Solarbank 4 Pro, Marstek Venus E 3.0 and SunEnergyXT 500 PRO. All around 5 kWh – the differences lie in control, software, price, and independent tests.
Key facts at a glance
- Anker Solarbank 4 Pro: high PV input (up to 5,000 W), large ecosystem.
- Marstek Venus E 3.0: affordable, but technically demanding (app/connection, higher losses).
- SunEnergyXT 500 PRO: best value for money – €1,349, "VERY GOOD" rating from ComputerBild, smoother zero-feed-in in the BILD test.
The three candidates
All three storage systems aim for the same purpose: storing solar surplus, increasing self-consumption, and achieving zero feed-in via a smart meter. They all have a capacity of around 5 kWh but take different approaches to software, control, and price.
Comparison table
| Feature | Anker Solarbank 4 Pro | Marstek Venus E 3.0 | SunEnergyXT 500 PRO |
|---|---|---|---|
| Capacity | 5 kWh | approx. 5.1 kWh | 5 kWh |
| Max. PV input | up to 5,000 W | medium | approx. 2,500 W |
| Zero feed-in | good | functional | particularly smooth in BILD test |
| Software | App + AI | App technically demanding | App + local Home Assistant API |
| Independent test | BILD practical test | – | "VERY GOOD" (ComputerBild) + BILD |
| Price approx. (June 2026) | from approx. €1,499 | approx. €1,019 | €1,349, immediately available |
Approximate figures, as of June 2026, based on publicly available retailer information; no guarantee.
Strengths & Weaknesses
Anker Solarbank 4 Pro: strong if you want to connect many modules (up to 5,000 W PV) and stay within the Anker ecosystem – but more expensive. In the BILD practical test, zero feed-in fluctuated slightly during harsh load changes and PV startup in low light occurred later.
Marstek Venus E 3.0: cheapest entry, but technically demanding in everyday use – app/connection issues and higher conversion losses are frequent criticisms (see our Venus-E guide).
SunEnergyXT 500 PRO: the most complete overall package – cheaper than Anker, with smoother zero feed-in and earlier PV startup in the BILD practical test, "VERY GOOD" rating from ComputerBild, open Home Assistant API, and expandable three-phase up to ~270 kWh.
Conclusion: Which 5 kWh storage system for whom?
Maximum PV power & Anker ecosystem → Anker Solarbank 4 Pro. Lowest price & willingness to tinker → Marstek Venus E 3.0. Best overall package of price, control, software & test → SunEnergyXT 500 PRO.
Our recommendation: SunEnergyXT 500 PRO – 5 kWh, "VERY GOOD" rating from ComputerBild, smooth zero feed-in, €1,349, immediately available.
View SunEnergyXT 500 PRO →Read more: Anker 4 Pro vs. SunEnergyXT 500 PRO in detail · 5 best alternatives 2026.
Important: Operation with more than 800 W
All three 5 kWh systems supply more than 800 W and do not fall under the simplified 800 W balcony power plant rule. Feed-in can be limited via zero feed-in; otherwise, the obligations of a larger PV system apply – see MaStR instructions.
Frequently Asked Questions (FAQ)
Which 5 kWh storage system offers the best value for money?
The SunEnergyXT 500 PRO (€1,349) – cheaper than the Anker Solarbank 4 Pro and independently tested as "VERY GOOD".
Which one has the highest PV input power?
The Anker Solarbank 4 Pro (up to 5,000 W).
Which one is the cheapest?
The Marstek Venus E 3.0 – but more technically demanding in everyday use.
As of: June 2026. Test results are based on the BILD buyer's guide (practical test 2026) and ComputerBild (15.04.2026). Information may change. Brand and product names belong to their respective manufacturers.
