MG Energy Systems
MG Energy Systems Low Voltage Master BMS. 24-48V. 1000A - M12 and RJ45 CAN Connection
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MGMLV481002
All in one low voltage BMS for 24 V and 48 V MG lithium banks, with a 1000 A safety contactor, integrated DC busbar and CAN-Bus M12 monitoring, for marine and off-grid systems.
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Available for collection or delivery in ~2 days
Pickup available at Mercury Yacht Harbour
Usually ready in 2-4 days
Description
The MG Master LV 24-48V/1000A is the all in one battery management system for low voltage lithium installations, rated for 24 V and 48 V systems with a 1000 A main safety contactor. It is the control and protection heart of an MG lithium bank, continuously monitoring every cell and module over CAN-Bus through each battery's built-in slave BMS. When any parameter moves outside the safe operating window, the internal safety contactor opens automatically and disconnects all chargers and loads, giving reliable second layer protection for demanding marine propulsion, hybrid and house bank duties.
An integrated DC busbar, pre-charge circuit and fuse holders for up to eight MEGA-fuses make for a compact, plug and play install with far fewer external components. Cell and module balancing maximises usable capacity and extends battery life, while CAN-Bus communication (NMEA2000 capable) ties the system to chargers, inverters and third party displays. Bluetooth and the MG Connect app give direct insight from a phone or tablet, and combined mode with a SmartLink MX lets several units build large, redundant banks. This version uses M12 CAN connectors for a rugged industrial connection.
PRODUCT DETAILS
- All in one BMS for 24 V and 48 V low voltage lithium systems (18 to 58 Vdc supply range)
- 1000 A main safety contactor disconnects chargers and loads if a parameter exceeds its safe limit
- Manages up to 48 RS modules or 96 LFP, HE, UHE or HP battery modules
- Integrated pre-charge circuit prevents contactor sparking and welding at start-up
- Built-in DC busbar with fuse holders for up to eight MEGA-fuses
- Cell and module balancing to maximise capacity and extend battery life
- CAN-Bus M12 communication, NMEA2000 capable, plus Bluetooth and MG Connect app
- Compact ABS enclosure, IP22 rated, 8.6 kg, with programmable relay and remote start-stop
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Key specifications
| System voltage | 24 V and 48 V |
| Main safety contactor current | 1000 A |
| Supply voltage range | 18 to 58 Vdc |
| Maximum batteries | 48 RS modules, or 96 LFP / HE / UHE / HP modules |
| Data connection | CAN Bus M12 |
| IP protection class | IP22 |
| Weight | 8.6 kg |
Electrical
| System voltage | 24 V and 48 V |
| Main safety contactor current | 1000 A |
| Supply voltage range | 18 to 58 Vdc |
| Maximum pre-charge capacity | 1 F at 24 V, 250 mF at 48 V |
| Power usage active | 8.7 W |
| Power usage standby | 73 mW at 26.2 V, 138 mW at 52.4 V |
Battery configuration
| Maximum batteries connected | 48 battery modules of type RS, or 96 modules of type LFP, HE, UHE, HP |
| Balancing | Cell and module level |
Communication
| Data connection | CAN Bus M12 |
| Protocol | CAN-Bus, NMEA2000 capable |
| Wireless | Bluetooth with MG Connect app |
Protection & I/O
| Allow-to-charge (relay output) | 0.8 A at 60 Vdc, potential free |
| Allow-to-charge (switched voltage) | 13.5 V / 1 A, overcurrent and short circuit protected |
| Allow-to-discharge (relay output) | 0.8 A at 60 Vdc, potential free |
| Allow-to-discharge (switched voltage) | 13.5 V / 1 A, overcurrent and short circuit protected |
| Auxiliary output | 13.5 V / 1 A, overcurrent and short circuit protected |
| External status signal | 13.5 V / 140 mA, overcurrent and short circuit protected |
| Programmable contact (relay output) | 0.8 A at 60 Vdc, potential free |
| Emergency switch connection | Hardwired shutdown to open the main contactor |
Mechanical
| Enclosure material | ABS |
| Dimensions (L x W x H) | 426 x 225 x 117 mm |
| Weight | 8.6 kg |
| IP protection class | IP22 |
Environmental
| Operating temperature range | -20 to +50 °C |
| Humidity (non-condensing) | <= 95 % |
General
| Manufacturer | MG Energy Systems |
| Country of origin | Netherlands |
| HS code | 8537109199 |
| Shipping weight | 9.2 kg |
| Approvals | IEC-EN62619 (ES-TRIN) |
| EMC emission | EN-IEC 61000-6-3:2007/A1:2011/C11:2012 |
| EMC immunity | EN-IEC 61000-6-1:2007 |
| Low Voltage Directive | EN 60335-1:2012/AC:2014 |
| RoHS | EN 50581:2012 |
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What batteries does the MG Master LV 24-48V work with?
It manages MG lithium banks at 24 V or 48 V, supporting up to 48 RS series modules or up to 96 LFP, HE, UHE or HP modules. Each MG battery carries its own slave BMS, and the Master LV collects that data over CAN-Bus to protect and balance the whole installation.
Do I need extra components to protect the battery bank?
The Master LV is an all in one design with an integrated DC busbar, pre-charge circuit and fuse holders for up to eight MEGA-fuses, so most installs need very few external parts. MG recommends high breaking capacity fuses on the battery side and a MEGA-fuse on each positive charger or load terminal.
Can I combine several Master LV units for a larger or redundant bank?
Yes. Using a SmartLink MX and the software combined mode, two or more Master LV units run as one large, fully scalable bank with built in redundancy, which is common on marine propulsion and large off-grid systems so the battery stays operational even if one string drops out.
