MG Energy Systems
MG Energy Systems Low Voltage Master BMS. 24-48V. 400A - M12 and RJ45 CAN Connection
£1,245.60
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MGMLV482400
An all-in-one 24 and 48 Vdc battery management system with an integrated 400 A safety contactor, M12 and RJ45 CAN-Bus and a hardwired emergency-stop input.
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Collection or delivery in 1-2 weeks
Pickup available at Mercury Yacht Harbour
Usually ready in 2-4 days
Description
The MG Master LV 24-48V/400A is an all-in-one battery management system for 24 V and 48 V lithium installations on leisure and commercial vessels. It continuously monitors every connected MG battery module over CAN-Bus, balances the cells and keeps voltage, current and temperature inside a safe operating window. If a parameter is exceeded, the integrated safety contactor opens automatically to disconnect chargers and loads, and a hardwired emergency-switch input lets the crew trip the contactor for an external emergency stop.
An internal DC busbar sits at the heart of the unit: batteries land on one side and chargers, inverters and electric drives on the other, which cuts cabling and speeds installation. The main contactor is rated for 400 A continuous, and a single Master LV can manage up to 48 RS modules or 96 LFP, HE, UHE or HP modules. M12 and RJ45 CAN-Bus ports carry NMEA 2000 and other selectable protocols, and combined mode lets several units run in parallel for larger, redundant banks.
PRODUCT DETAILS
- All-in-one 24 and 48 Vdc BMS with an internal DC busbar that cuts cabling and speeds installation
- Integrated safety contactor rated 400 A continuous, opening automatically to disconnect chargers and loads on a fault
- Hardwired emergency-switch input opens the main contactor for an external emergency stop
- Manages up to 48 RS modules or 96 LFP, HE, UHE or HP modules from a single Master LV
- M12 and RJ45 CAN-Bus ports with NMEA 2000 and other software-selectable protocols
- Active cell and module balancing to preserve capacity and extend battery life
- Bluetooth monitoring and control through the free MG Connect app
- Rugged ABS enclosure, IP22 rated, 4.9 kg, operating from -20 to +50 C
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Key specifications
| System voltage | 24 V and 48 V |
| Max continuous current | 400 A (main safety contactor) |
| Battery modules supported | Up to 48 RS or 96 LFP/HE/UHE/HP modules |
| Data connection | CAN Bus M12 and RJ45 |
| Safety contactor | Integrated, opens automatically on fault |
| IP protection | IP22 |
| Weight | 4.9 kg |
Electrical
| System voltage | 24 V and 48 V |
| Supply voltage range | 18 to 58 Vdc |
| Main safety contactor current | 400 A |
| 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 |
| Cell balancing | Active balancing on cell and module level |
Communication
| Data connection | CAN Bus M12 |
| CAN-Bus ports | RJ45 and M12 connectors included |
| Communication protocols | NMEA 2000 and other CAN-Bus protocols, software selectable |
| Bluetooth | Built-in, via the MG Connect app |
Protection & I/O
| Safety contactor | Integrated main contactor, opens automatically when a parameter exceeds the safe window |
| Emergency switch connection | Hardwired input, emergency shutdown opens the main contactor |
| Pre-charge circuit | Built-in, limits inrush current at start-up |
| 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 |
Mechanical
| Dimensions (L x W x H) | 426 x 225 x 117 mm |
| Enclosure material | ABS |
| IP protection class | IP22 |
| Weight | 4.9 kg |
| Operating temperature range | -20 to +50 C |
| Humidity | Up to 95 % (non-condensing) |
General
| Manufacturer | MG Energy Systems |
| Country of origin | Netherlands |
| 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 |
| HS code | 8537109199 |
| Shipping weight | 5.5 kg |
| Classified as dangerous goods | No |
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Which batteries does the Master LV 24-48V/400A support?
It suits 24 V and 48 V MG lithium systems, managing up to 48 RS modules or 96 LFP, HE, UHE or HP modules from one Master LV. Each module has its own slave BMS reporting cell data over CAN-Bus.
What connectors and protocols does this variant use?
It uses M12 CAN-Bus connectors alongside RJ45 ports, so it fits NMEA 2000 networks and other CAN-Bus protocols that are selectable in the BMS software.
Does it provide an emergency shutdown?
Yes. Besides the contactor that opens automatically on a fault, the 24-48V Master LV adds a hardwired emergency-switch connection to open the main contactor for an external emergency stop.
