DEKA Duration DD300-12H 300Ah 3.6kWh 12V LiFePO4 Heated Monobloc Battery
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Estimated Delivery:Jul 20 - Jul 24
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DEKA Duration DD300-12H 300Ah 3.6kWh 12V LiFePO4 Heated Monobloc Battery
Why Choose the Deka Duration DD300-12H 12V 300Ah LiFePO4 Heated Battery for Cold-Climate Energy Storage
The Deka Duration DD300-12H is a 12V 300Ah LiFePO4 Heated Monobloc Battery built on Lithium Iron Phosphate chemistry with a fully integrated Battery Management System (BMS) and built-in self-heating capability. Rated at 300Ah with 3.6kWh of usable energy, it is engineered for high-capacity applications in cold climates that demand deep, repeated cycling — including off-grid solar storage, large RV and marine house loads, golf carts, and home backup power systems — all in a sealed, IP67-rated, fire-resistant package that charges reliably down to -4°F (-20°C).
Key Specifications
| Specification | Value |
|---|---|
| Model | DD300-12H |
| Voltage | 12V (12.8V Nominal) |
| Capacity | 300Ah |
| Usable Energy | 3.6kWh (3.84kWh usable) |
| Chemistry | LiFePO4 (Lithium Iron Phosphate) |
| Manufacturer Part # | DD300-12H |
| Dimensions (L×W×H) | 19.69 × 10.43 × 9.2 in (500 × 265 × 232.4 mm) |
| Weight | 82.67 lbs (37.5 kg) |
| IP Rating | IP67 (Waterproof & Dustproof) |
| Cycle Life | 6,000 cycles at 80% DoD |
| Usable DoD | 100% |
| Efficiency | 99% |
| Self-Discharge | 3% per month |
| Internal Resistance | <30mΩ |
| Built-in BMS | Internal with Smart Communication |
| Built-in Low-Temp Heater | Automatic, Activates Below 32°F (0°C) |
| Parallel/Series Config | Up to 16 in Parallel or 4P×4S |
| US Made | Yes |
Built-in Heating for Cold-Climate Charging
Standard LiFePO4 batteries cannot be safely charged below freezing — a critical limitation in cold-weather installations. The DD300-12H solves this with an integrated self-heating system that brings the cells to a safe operating temperature before and during charging, enabling full charge capability down to -4°F (-20°C). Whether installed in a northern off-grid cabin, a winter RV build, or an outdoor backup system, this battery charges reliably where standard lithium batteries would shut down or sustain cell damage.
Charging Specifications
| Parameter | Value |
|---|---|
| Recommended Charge Current | 150A |
| Max Charge Current | 300A |
| Absorption Voltage | 14.2–14.6V |
| Float Voltage | 13.6–13.8V |
| Absorption Time | 60 minutes per 100Ah |
| Charge Temperature Range | -4°F to 140°F (-20°C to 60°C) — with Built-in Heater |
Discharging Specifications
| Parameter | Value |
|---|---|
| Recommended Discharge Current | 150A |
| Max Continuous Discharge | 300A |
| Peak/Surge Current | 1,000A for 5 seconds |
| Discharge Temperature Range | -4°F to 140°F (-20°C to 60°C) |
| Recommended LVD | 11–11.6V |
| BMS Discharge Voltage Cut-Off | 10.6–11V |
| Short Circuit Protection | 1200A / 500µs |
Temperature Specifications
| Parameter | Value |
|---|---|
| Operational Temperature | -4°F to 140°F (-20°C to 60°C) |
| Storage Temperature | 59°F to 95°F (15°C to 35°C) |
| BMS High Temp Cut-Off | 149°F (65°C) |
Certifications
UN38.3, UN3480 Class 9, UL 1973 Recognized Component, IEC62619, UL9540A, UL1642, CE
Key Applications
- Cold-Climate Solar Energy Storage: Off-grid cabin, van build, or residential solar backup — 3.6kWh per unit, scalable up to 16 units in parallel, charges reliably at temperatures where standard lithium batteries cannot.
- Golf Carts: High surge current, 100% usable DoD, and 6,000-cycle life — a direct upgrade over lead-acid in all-season environments.
- RV House Loads: Powers lights, appliances, inverters, and electronics through all four seasons including winter camping.
- Marine Applications: IP67-rated sealed construction handles moisture, vibration, and tilt common in marine environments.
- Home Backup & UPS: Dependable standby power for inverter-based home battery backup systems in cold climates.
BMS Protection Features
- Overcharge protection
- Over-discharge protection
- Short circuit protection (1200A / 500µs)
- High-temperature cutoff at 149°F (65°C)
- Automatic reconnect once safe conditions are restored
- Fire-rated ABS PC casing — IP67 waterproof and dustproof
Warranty
Backed by Deka's manufacturer warranty — 120 months / 6,000 cycles. As an Authorized Deka Distributor, Solar Cellz USA provides genuine products with full manufacturer warranty support.
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We want you to be 100% satisfied with your purchase. Items can be returned or exchanged within 30 days of delivery.
