Mastervolt
Mastervolt ChargeMaster Plus 24/40-3
Pickup available at Mercury Yacht Harbour
Usually ready in 2-4 days
Description
The ChargeMaster Plus 24/40-3 is a 24 V multi-charger that integrates several functions into a single device, replacing auxiliary chargers, battery isolators and a VSR to cut system complexity and cost. Built on the 'Battery's Best Friend' architecture, it charges a wide range of battery chemistries, sizes and voltages using the fast and safe 3-step+ method. Smart features include Revival mode for fully depleted batteries, Priority Charge that redirects power to the lowest battery, and a Smart Input that lets all three batteries charge from a single alternator while underway.
An integrated VSR ensures alternator energy is funnelled to the batteries, while the 24 V model can even charge a 12 V starter battery without extra components. Native MasterBus, CZone and NMEA 2000 communication, plus a very wide 80-275 V AC operating range, make it equally suited to standalone use and full system integration in harsh marine and mobile environments.
PRODUCT DETAILS
- Multi-charger with two outputs, one Smart In/Output, current limiter and integrated VSR
- Delivers up to 40 A total at 28.8 V and charges up to three batteries
- Battery's Best Friend architecture charges Lithium Ion, Gel, AGM and flooded via 3-step+
- Revival mode automatically revives even fully depleted batteries
- Priority Charge redirects available power to the lowest battery for faster charging
- Smart Input charges all three batteries from a single alternator while underway
- Multi voltage capability charges a 12 V starter battery in a 24 V system
- Native MasterBus, CZone and NMEA 2000 communication for full system integration
- 20% more output at 28.8 V and 80% charging power at 60 °C
- ChargeMaster Plus battery charger
- Battery temperature sensor
- Mounting bracket and fixing material
- User and installation manual
No exploded diagram available for this product.
No compatible transducers listed for this product.

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Mastervolt MasterBus cable 6 metre

Mastervolt MasterBus cable 10 metre

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Mastervolt MasterBus Serial Interface

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Communication & monitoring
| Communication interfaces | MasterBus, CZone, NMEA |
General specifications
| Nominal output voltage | 24 V |
| Max. output current primary output | 40 A |
| Smart In-/Output output voltage | 12 or 24 V |
| Smart In-/Output output current | 5-10 A at 12 V; 5-20 A at 24 V (adjustable) |
| Smart In-/Output input current | max. 20 A at 24 V |
| Total charge current | 40 A at 28.8 V |
| Max. AC current (230 V / 120 V) | 6.8 A / 13.5 A |
| Number of battery outlets | 3 (max.) |
| Battery bank size | 160-400 Ah |
| Nominal input voltage | 120/230 V (80-275 V) 50/60 Hz |
| AC connection | screw terminals, suitable up to up to 6 mm² |
| Power supply mode | yes |
| Galvanic isolation | yes |
| Display/read-out | LED display |
| Dimensions, hxwxd | 384 x 250 x 127 mm |
| Weight | 5.9 kg |
| Compliance | CE, ABYC, UL1236, SAE J1171, ISO 8846, CEC/DOE, RCM/C-Tick, RMRS, RRR |
Technical specifications
| Charge characteristic | IUoUo, automatic / 3-step+ for Gel/AGM/flooded/Lithium Ion + user defined option |
| Temperature compensation | -60 mV/°C / -76 mV/°F; temperature sensor included |
| DC voltage compensation | through automatic compensation or MasterShunt |
| Power consumption (DC side) | < 2 mA (MasterBus off) |
| Current Control function | yes, through MasterBus or CZone |
| Power factor control | > 0.98 |
| Temperature range (ambient temp.) | -25 °C to 80 °C, derating < 0 °C and > 40 |
| Cooling | vario fan |
| Protection degree | IP23, vertical mounting |
| Protections | over-temperature, overload, short circuit, high/low battery voltage, ignition protection |
| Charger Status Interface (alarm contact) | yes, using a Multipurpose Contact Output (code 77030500) |
- User and Installation manual ChargeMaster Plus 12/75-3, 12/100-3, 24/40-3, 24/60-3 - CZone
- UK DoC Chargemaster Plus 12/75-3, 12/100-3, 24/40-3, 24/60-3
- EU Declaration of Conformity, Chargemaster Plus, Oct 2024
- Ignition Protection certification letter
- RMRS Approval, Mastervolt ChargeMaster series, Sep 2024




