Earn money exporting surplus energy with SEG
Store your solar and earn from every surplus unit.
Home battery storage
Your Home. Your Grid. Your Profit.
Buy cheap. Store smart. Sell high.
Smart tariff integration
Active Energy Arbitrage automates your wealth.
Your system purchases grid electricity during overnight off-peak windows — as low as 7p/kWh on time-of-use tariffs — and discharges during expensive evening peak hours when the grid rate exceeds 35p/kWh. Automatically, every night.
*Illustrative; varies by tariff and usage.
See what overnight-to-peak arbitrage could earn against your own tariff and usage.
See My Battery PaybackThe app experience
Absolute control at your fingertips.
Monitor your battery's state of charge, programme your tariff arbitrage schedule, track your daily export earnings, and review your monthly savings in real time — via the Duracell Energy App, Tesla App, Growatt ShinePhone, or Fox Cloud App, depending on your chosen hardware ecosystem.
Battery Ecosystem Comparison
Every battery First Choice Solar installs is specified to match your property's consumption profile, phase configuration, and inverter ecosystem. Verified manufacturer figures:
| Product | Capacity | Best for | Monitoring app |
|---|---|---|---|
 Duracell Dura5 Our pickDownload Spec Sheet (PDF) | 5.12kWh nominal · 4.6kWh usable | Standard residential — LiFePO4, 8,000 cycles, scalable to 32 units |  Duracell Energy App |
 Duracell Dura5 HVDownload Spec Sheet (PDF) | 5.12kWh nominal · 4.6kWh usable | Three-phase homes & commercial — 1–16 batteries per inverter | Duracell Energy App |
 Tesla Powerwall 3 | 13.5kWh + integrated inverter | Premium residential — brand recognition |  Tesla App |
 Fox ESS EP5Download Spec Sheet (PDF) | 5.18kWh nominal · 90% DoD | Entry residential — Fox ecosystem, scalable to 20.8kWh |  Fox Cloud App |
 Fox ESS EP6Download Spec Sheet (PDF) | 5.76kWh nominal · 90% DoD | Mid-tier residential — scalable to 23.04kWh | Fox Cloud App |
 Fox ESS EP11Download Spec Sheet (PDF) | 10.36kWh nominal · 90% DoD | High self-sufficiency residential — scalable to 41.6kWh | Fox Cloud App |
 Fox ESS EP12Download Spec Sheet (PDF) | 11.52kWh nominal · 90% DoD | Maximum residential self-sufficiency — scalable to 46.08kWh | Fox Cloud App |
 Growatt ALP LVDownload Spec Sheet (PDF) | 5kWh to 400kWh modular | High-capacity & commercial — cobalt-free LiFePO4, IP66 |  Growatt ShinePhone |
Full Technical Specifications
Every figure sourced directly from manufacturer datasheets.
Duracell Dura5
Standard residential storage — safe LiFePO4, modular to 32 systems.
5.12kWh
Module energy
4.6kWh
Useable energy
8,000
Cycles
10yr
Warranty
IP65
Ingress rating
| Electrical | |
|---|---|
| Battery module energy | 5.12 kWh |
| Useable energy | 4.6 kWh |
| Nominal voltage | 51.2 V DC |
| Operating voltage | 43.2 V – 56.8 V |
| Max output current | 100 A (peak 110 A) |
| Cell technology | LiFePO4 |
| Physical | |
| Dimensions (W×D×H) | 490 × 110 × 688 mm |
| Weight | 51.5 kg ±1 kg |
| IP rating | IP65 |
| Cooling method | Natural convection |
| Installation | Stackable or wall-mount |
| Scalability | Max 32 systems in parallel |
| Performance | |
| Cycle life | 8,000 cycles |
| Operating temperature | Charge/discharge −10°C to +55°C |
| Operating altitude | 0 – 3000 m (derating above 2000 m) |
| Humidity range | 5% – 95% |
| Connectivity | |
| Communication | CAN / RS485 |
| Display | LED indicator |
| Monitoring app | Duracell Energy App |
| Warranty | |
| Warranty period | 10 years |
| Model | PD-5KWH-50V-2G |
Not sure which battery fits your consumption, phase and inverter? We'll match it for you.
Match a Battery to My HomeFuture-Proof Architecture That Grows With You
Start with 5kWh. Scale to 10kWh, 15kWh, or 20kWh as your family's energy demands grow. The Duracell Dura5 and Growatt ALP5.0L-E1 are both fully modular — additional units stack without replacing existing hardware.
5kWh
1 unit
~55% self-sufficient
10kWh
2 units
~75% self-sufficient
15kWh
3 units
~88% self-sufficient
20kWh
4 units
~95% self-sufficient
Self-sufficiency figures are illustrative for a typical UK household and vary by consumption profile.
Export and Earn During Peak SEG Windows
Intelligent battery discharging means you can export your stored energy to the grid during the highest-value SEG tariff windows — earning up to 25p/kWh with premium providers such as Good Energy. Your battery does not just save you money. It makes you money.
Learn how the Smart Export Guarantee worksGet a free storage design sized to your home — and start earning from every surplus unit.
Calculate My Battery SavingsTechnical Documentation
Download the full manufacturer datasheets for our home and commercial battery range.
Calculate Your Battery Savings
Match the right battery to your consumption profile, phase configuration, and inverter ecosystem.
£0 deposit. No obligation. Free forensic report. HIES-protected from day one.