DC Battery Modules — D-Series

51.2V DC battery modules designed to be paired with any compatible 48V hybrid inverter — including BeSafe's G-series and most third-party brands. Stack 1–15 modules to scale from 5 kWh home installations to 300 kWh commercial systems. Drop-in lithium replacement for legacy VRLA banks — with three to four times the cycle life and one-third the weight.

48V/51.2V DC 5–20 kWh Per Module 15-Module Parallel Wall or Rack Mount IEC 62619 Certified
Why lithium over VRLA for network power? A traditional 48V 100Ah VRLA battery delivers ~500 cycles at 50% DoD, weighs ~60 kg, requires quarterly equalization charging, and loses capacity permanently if left discharged. The BeSafe D-series LiFePO4 equivalent delivers 6,000+ cycles at 80% DoD, weighs ~50 kg, has zero memory effect, and tolerates partial state of charge indefinitely.

Built for Daily-Cycle Storage

Network power batteries are usually in a closet, ignored, and expected to work the one time per year that grid power fails. They also need to support short-duration high-power pulses (radio transmission) and continuous low-rate float operation. BeSafe's D-series is engineered for both ends of that duty cycle.

Standard 48V/51.2V Compatibility

Nominal 51.2 VDC (16S LiFePO4) with 44.8–58.4 VDC operating range — designed as a drop-in replacement for 48V VRLA banks in solar, off-grid, and backup-power systems.

Up to 15-Module Parallel

Connect up to 15 D-series modules in parallel for a 300 kWh battery bank. Internal BMS handles current sharing automatically; no external balancing hardware required.

Multi-Brand Inverter Compatibility

Standard CAN / RS485 communication protocols integrate with major hybrid inverter brands. Tested compatibility with Victron, SMA, Studer, Sol-Ark, Deye, and others.

Wall-Mount or Stackable

Wall-mounting bracket included for space-constrained installations. Modules can also be stacked vertically on the optional rack frame for cabinet deployment.

Smart BMS with Remote Monitoring

Per-cell voltage, current, and temperature monitoring. SOC and SOH displayed on front-panel LED indicator or remote terminal. Supports dry-contact alarm output for NMS integration.

Wide Operating Temperature

Charge: 0 to 45 °C. Discharge: -20 to 55 °C. Storage: -20 to 45 °C. Operates reliably in unheated garages, outdoor cabinets, and conditioned indoor utility rooms alike.

Models in This Series

D5 5 kWh · 5 kW 100 Ah

Entry-level module for small home backup, off-grid cabins, and SOHO solar storage. Single-module systems cover essential-load backup for typical 1-bedroom installations.

Download D5 Brochure

D10 10 kWh · 9.8 kW 200 Ah

Mid-size module for whole-home solar self-consumption and small commercial ESS. 2–4 module parallel supports typical residential and small-shop loads (10–40 kWh total).

Download D10 Brochure

D15 15 kWh · 14.4 kW 300 Ah

Mid-high capacity for large residential properties and small C&I deployments. Common 4-module configuration delivers 60 kWh — enough for several hours of full-load backup.

Download D15 Brochure

D20 20 kWh · 18.8 kW 400 Ah Largest

Highest-capacity 51.2V module. Used in commercial ESS deployments, light industrial peak shaving, and microgrid battery banks. 15-module parallel supports up to 300 kWh banks.

Download D20 Brochure

Technical Specifications

ParameterD5D10D15D20
Nominal Capacity5,120 Wh10,240 Wh15,360 Wh20,480 Wh
Nominal Voltage51.2 VDC51.2 VDC51.2 VDC51.2 VDC
Operating Voltage Range44.8 – 58.4 VDC44.8 – 58.4 VDC44.8 – 58.4 VDC44.8 – 58.4 VDC
Rated Capacity100 Ah200 Ah300 Ah400 Ah
Configuration16S1P16S1P × 216S1P × 316S1P × 4
Rated DC Output Power5 kW9.8 kW14.4 kW18.8 kW
Peak DC Output5 kVA9.8 kVA14.4 kVA18.8 kVA
Motor Load Capacity3.6 HP7.2 HP10.6 HP13.8 HP
Max Continuous Discharge100 A196 A288 A376 A
Max Continuous Charge100 A193 A288 A376 A
Internal Impedance≤ 40 mΩ≤ 20 mΩ≤ 10 mΩ≤ 5 mΩ
Charging Voltage58.4 VDC58.4 VDC58.4 VDC58.4 VDC
Factory Voltage51.0 – 53.0 V (40–60%)51.0 – 53.0 V (40–60%)51.0 – 53.0 V (40–60%)51.0 – 53.0 V (40–60%)
End-of-Discharge Voltage42.4 – 46.4 VDC42.4 – 46.4 VDC42.4 – 46.4 VDC42.4 – 46.4 VDC
Cycle Life (80% DoD)6,0006,0006,0006,000
CoolingIntelligent air coolingIntelligent air coolingIntelligent air coolingIntelligent air cooling
IP RatingIP21IP21IP21IP21
Anti-CorrosionC2C2C2C2
CommunicationCAN / RS485CAN / RS485CAN / RS485CAN / RS485
ConnectorTerminal block / quick-connectTerminal block / quick-connectTerminal block / quick-connectTerminal block / quick-connect
Dimensions (W×T×H, mm)420 × 156 × 630420 × 156 × 630420 × 156 × 630420 × 156 × 630
Weight~53 kg~106 kg~159 kg~212 kg
InstallationWall-mount / StackableWall-mount / StackableWall-mount / StackableWall-mount / Stackable

Typical Applications

Residential ESSWhole-home solar storage
Commercial ESSDaily-cycle peak shaving
Network ClosetsEnterprise switching
Small UPS SystemsOffice / server rooms
Off-grid & MicrogridSolar + storage islands
VRLA ReplacementDirect swap upgrade

Certifications & Standards

IEC 62619 UN38.3 MSDS CE RoHS EN IEC 61000-6-4:2019

Migration Path from VRLA

Most VRLA-to-lithium migrations are straightforward: the existing 48V DC bus, charge controller, and inverter equipment typically work without modification. The main changes are the addition of a CAN/RS485 gateway (if your inverter doesn't speak lithium protocols natively) and updated alarm thresholds. BeSafe engineering can support a site-survey-to-commissioning migration plan, including pilot deployment for one cabinet before site-wide rollout.

Plan a DC battery module deployment?

Send us your existing battery bank specs and load profile. We'll propose a D-series configuration with migration support.

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