| Published power range | 3 kW |
| Scored benchmark | 3 kW |
| Cell chemistry | LFP (LiFePO4) |
| Usable energy / DoD | 100% DoD |
| Safety certification | Certifications not listed |
| Manufacturing track record | 1-4 years, scaling |
Some values are estimated where independent verification was not available: see the full scorecard and review.solar/terms.
Venus E 4.0 · every criterion scored by the live rubric (Solar Analytica plug-in ESS rubric v1.2.0), with its recorded value, evidence status, and any linked source. Page 1 carries the buying-decision summary; this page is the full record for verification and right of reply.
| Capacity & Usability | |||
| Usable energy / DoD (%) | 100 | stated | No link |
| Modularity & scalability | Fully modular, ≤5 kWh increments, expandable in field | stated | No link |
| Energy density / footprint | Compact high-density (integrated) | stated | No link |
| Output Power | |||
| Grid-injection power (kW) | 3.0 | stated | Source |
| Backup output power (kW) | 3.0 | stated | Source |
| Backup switching speed | <20ms (appliance-safe) | stated | Source |
| Operating temperature range | Wide (-20°C to 55°C+), self-heating confirmed | stated | Source |
| Longevity (verified) | |||
| Cell balancing architecture | Pack-level only / not disclosed | stated | No link |
| Warranty degradation guarantee | Warranty degradation terms not specified | stated | No link |
| Safety & Chemistry | |||
| Cell chemistry | LFP (LiFePO4) | stated | Source |
| Safety certification | Certifications not listed | stated | No link |
| Thermal & fire mitigation | Not specified | stated | No link |
| Self-heating capability | Cold-weather operation not stated | stated | No link |
| Ingress protection (outdoor) | IP65+ outdoor-rated | stated | Source |
| Guarantee & Backbone | |||
| Financial strength & warranty backing | Mid-tier private, no distress signals | stated | No link |
| Manufacturing track record | 1-4 years, scaling | stated | No link |
| Connectivity & Ecosystem | |||
| Open protocol & API maturity | Proprietary / no documented API | stated | No link |
| VPP & grid services readiness | No VPP capability stated | stated | No link |
| Smart home & IoT depth | No documented smart home integration | stated | No link |
review.solar · audit sheet · Solar Analytica plug-in ESS rubric v1.2.0 · https://review.solar/cards/marstek-marstek-venus-e-4-0