Marstek Venus E vs Sessy 2.0 5 kWh
Usable capacity: Marstek Venus E 5.12 kWh, Sessy 2.0 5 kWh 5.2 kWh. The Sessy 2.0 5 kWh is better on 2 of 6 comparable points.
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Both models in detail
Who wins where
- Marstek Venus E
- Sessy 2.0 5 kWh
Biggest differences
| Fact | Venus E | 2.0 5 kWh |
|---|---|---|
| Charge power (continuous) | 2.5 kW | 2.2 kW |
| Nominal capacity | 5.12 kWh | 5.5 kWh |
Score per area = position (0–100) relative to all 140 models in this category; higher is better.
| Technical specifications | MarstekVenus E | Sessy2.0 5 kWh |
|---|---|---|
| General | ||
| Cell chemistry | LFP1 | LFP2 |
| Smart charging on dynamic prices | – | Yes2 |
| Wi-Fi / app | Yes1 | Yes2 |
| Performance | ||
| Usable capacity | 5.12 kWh1 | 5.2 kWh✓2 |
| Nominal capacity | 5.12 kWh1 | 5.5 kWh✓2 |
| Expandable up to | – | 31.2 kWh2 |
| Charge power (continuous) | 2.5 kW✓1 | 2.2 kW2 |
| Discharge power (continuous) | – | 1.7 kW2 |
| Electrical | ||
| Coupling | AC-coupled1 | – |
| Phases | – | 12 |
| Backup power | Yes1 | – |
| Off-grid capable | Yes1 | – |
| Dimensions & weight | ||
| IP rating | IP651 | IP202 |
| Min. operating temperature | -20 °C1 | – |
| Width | 560 mm1 | 410 mm2 |
| Height | 690 mm1 | 670 mm2 |
| Depth | 201 mm1 | 200 mm2 |
| Weight | – | 46 kg2 |
| Warranty & lifespan | ||
| Warranted cycles | 6,0001 | 6,0002 |
| Warranty | 10 years1 | 10 years2 |
Frequently asked questions
Which is better: the Marstek Venus E or the Sessy 2.0 5 kWh?
Usable capacity: Marstek Venus E 5.12 kWh, Sessy 2.0 5 kWh 5.2 kWh. The Sessy 2.0 5 kWh is better on 2 of 6 comparable points.
What is the usable capacity of the Marstek Venus E and the Sessy 2.0 5 kWh?
Marstek Venus E: 5.12 kWh. Sessy 2.0 5 kWh: 5.2 kWh.
Which is better on charge power (continuous): the Marstek Venus E or the Sessy 2.0 5 kWh?
Marstek Venus E: 2.5 kW. Sessy 2.0 5 kWh: 2.2 kW.
Which is better on nominal capacity: the Marstek Venus E or the Sessy 2.0 5 kWh?
Sessy 2.0 5 kWh: 5.5 kWh. Marstek Venus E: 5.12 kWh.
Related comparisons
How we collect and check this data →
Sources
- MARSTEK VENUS C / E AC-Coupled Energy Storage System, 1.0 — Marstek · accessed Oct 16, 2026
- Sessy 2.0 5 kWh – specificaties, 09/2025 (tekst herkend met OCR) — Sessy B.V. · accessed Sep 27, 2026