Sunsynk 20.48kWh HV Battery System
- High-capacity: 20.48kWh storage from 4 modular HV lithium batteries — ideal for homes, business and backup
- Robust, reliable construction with advanced BMS for safety, longevity and seamless integration with Sunsynk inverters
- Scalable, secure battery cabinet system for easy installation — designed for demanding UK and commercial settings
Description
The Sunsynk 20.48kWh High Voltage Battery System provides a complete energy storage solution combining four 5.12kWh HV Battery Modules (G20), a dedicated HV BMS, and a secure battery cabinet. This modular system is optimised for larger residential, SME, public sector, and backup applications in the UK. Featuring advanced lithium ferro-phosphate chemistry for extended cycle life and safety, it delivers reliable power, rapid installation and efficient operation alongside Sunsynk hybrid and off-grid inverters.
Key Features
- Total usable energy: 20.48kWh system (4×5.12kWh HV modules)
- High-voltage design: Max 1C charge/discharge rate (up to 20.48kW), suitable for dynamic loads and fast backup
- Advanced BMS: Full protection, real-time monitoring, compatible with Sunsynk and other leading inverters
- Modular battery rack: Secure cabinet with door, keeping cells safe and installation neat
- Long cycle life and safety with premium LFP cells and full UK certifications
Technical Specifications
| Battery Chemistry | Lithium Ferro-Phosphate (LiFePO4) |
| Number of Modules | 4 × Sunsynk 5.12kWh Battery (G20) |
| Module Rated Energy | 5.12kWh |
| Total System Energy | 20.48kWh |
| Nominal Module Voltage | 204.8V |
| Operating Voltage Range | 164.4-233.6V |
| Module Capacity | 100Ah |
| Nominal Charge/Discharge Rate | 100A |
| Cycle Life | 6000+ cycles at 80% DoD |
| IP Rating | IP20 (cabinet/rack) |
| Warranty | 10 years |
| Certifications | IEC62619, UN38.3, EN/IEC 61000-6 |
| Operating Temperature (Charge) | 0–55°C |
| Operating Temperature (Discharge) | -20–55°C |
| Weight (per module) | Approx. 44kg |
| Cabinet Weight Range | 44–85kg (varies with battery count/type) |
| Total System Weight (4 modules + rack) | Approx. 220kg |
| Dimensions (per module) | TBA — please contact for up-to-date rack/cabinet sizing |
| Relative Humidity Range | 5–85% RH |
| Altitude Limit | ≤2000m |
| Enclosure Type | Floor/rack mount, secure metal cabinet with door |
| Communications | CAN, RS485 |
| Protection Features | Over/under-voltage, short-circuit, thermal, cell/pack balancing (managed by BMS) |
Applications
- Residential and SME energy storage for hybrid, solar and off-grid systems
- Commercial and public sector backup (schools, estates, care facilities)
- Demand management, critical infrastructure and scalable multi-rack deployments
Shipping & Support
Delivery available UK-wide, Ireland, Africa, the Caribbean and worldwide. If shipping rates are not shown at checkout, please ring +44 2080640335 or info@energian.co.uk for a quote.
UK expert support is available – contact us by phone, email, live chat, or visit our London office for advice. We recommend installation by a trusted Sunsynk partner or certified electrician.