Mastervolt ChargeMaster Plus Battery Charger (12V / 100A) M44311005 44311005


Recommended Retail Price
£1,439.06 Inc. VAT

Online Price (inc. VAT)

Part Number: AQ M44311005

  • COVID 19 Disruption
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Due to the ongoing and evolving "LOCKDOWN" situation in place since early 2020, we are anticipating a small delay in processing of orders and subsequent shipping due to a reduced workforce, in both our warehouses, and those of our suppliers.

Whilst we are trying our best to continue in a business as usual, we must again close our retail showroom doors temporarily to support the Governments COVID19 Strategy. Throughout this temporary closure we will still be shipping items from our warehouses and those of our suppliers, but it may at times be subject to a small delay.

The quickest way to get an answer to any questions you may have is to email us on Alternatively should you wish to actually speak to a member of our team, please call us on 02087884587 and Choose Option 1.





The Mastervolt ChargeMaster Plus battery charger is designed to help batteries perform better and last longer, providing fast and complete charging wherever you are. It also performs the job of a battery isolator, prioritising charge to the battery that needs it most. The energy from the alternator is fed through to the batteries with the integrated VSR, meaning all your charging needs are provided by the ChargeMaster Plus. The charger is compact and the robust connections are ergonomic, making the unit very quick and easy to install.

The 3-STEP+ charging memory ensures more power and a longer life for your batteries, and will even charge depleted batteries. The ChargeMaster is suitable for all types of battery, and also has a wide input voltage range, which ensures perfect automatic operation anywhere in the world.

ChargeMaster Plus is MasterBus compatible, meaning they can be connected easily to a MasterBus system where you can operate and monitor all Mastervolt devices in one panel. In addition, they can also be linked via CZone and NMEA 2000 integrations without additional equipment, meaning it can link up with displays, shunts and power systems. Other communication standards like ModBus, CANopen, LinBus, etc. are supported via additional interfaces.

Communication & monitoring

Communication interfaces: MasterBus, CZone, NMEA

General specifications

Nominal output voltage : 12 V

Max. output current primary output: 100 A

Smart In-/Output voltage: 12 V

Smart In-/Output current: 5-40 A (adjustable)

Smart In-/Output input current: max. 40 A

Total charge current: 100 A at 14.4 V

Max. AC current (230 V / 120 V): 8.5 A / 17 A

Number of battery outlets: 3 (max.)

Battery bank size: 400-1000 Ah

Nominal input voltage: 120/230 V (80-275 V) 50/60 Hz

AC connection: screw terminals, suitable up to up to 6mm²

Power supply mode: yes

Galvanisedanic isolation: yes

Display/read-out: LED display

Dimensions, hxwxd: 384 x 250 x 127mm (15.1 x 9.8 x 5.0 inch)

Weight: 5.9 kg (13.0 lb)

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: -30 mV/°C / -17 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 °C (-13 °F to 176 °F)

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 M77030500)


Brand Mastervolt
Height 384mm (15.1")
Width 250mm (9.8")
Depth 127mm (5.0")
Weight 5.9 kg (13.0 lb)
Temperature Range Ambient Temperature: -25 °C to 80 °C, derating < 0 °C and > 40 °C (-13 °F to 176 °F)
Protection Rating IP23

Key Features

Multicharger with two outputs, one in/output, DC-DC converter, current limiter and VSR.

Combine Lithium Ion, Gel or AGM.

Charges multiple batteries while being underway.

Handles worldwide AC voltages and frequencies.

Offers 20 % more output at 14.4 V and 80 % charging power at 60 °C.

Safe Charge: quickly recognize the State of Charge for extended battery life.

Wide operating range of 80-275 V AC, 35-70 Hz.

Revival mode: automatically revives even fully depleted batteries.

Priority Charge: redirect available power to the lowest battery, for faster charging.

Smart Input: charge all three batteries from one single alternator for continuous charging on the go.

Downloads - Click the links below

Customer Questions & Answers

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Our Mail Order team ship chandlery, yacht parts and sailing clothing around the world. We try to use the best value couriers available, and we will endeavour to get your products to you as quickly and as cost effectively as possible. 

As with everything automatic, sometimes it might not present you with the best value price, please feel free to contact our helpful team who will endeavour to provide you with our best price for shipping to your address.

UK Standard Delivery

Please use the checkout process to get an accurate shipping quote for your cart, all of our rates are automatically calculated based upon your selections.

As with everything automatic, sometimes it might not present you with the best value price, please feel free to contact our helpful team who will endeavour to provide you with our best price for shipping to your address.

International Delivery

International Delivery is calculated based on a series of complex formulae at checkout and includes options such as UPS International. If you cannot see a rate at checkout, please contact us.

Delivery further information

The delivery charge is automatically added to your order and you will see the total amount you have to pay before you confirm the order. Unfortunately we have to charge carriage but we do attempt to keep it to a minimum where possible

All orders leaving us require a signature, and the delivery could take place any time between 8am and 6pm depending on the courier used. If you are liable to be out, please give an alternative delivery address or type instructions into the notes section as you place your order.

Standard Service; We will aim to dispatch goods within 3 working days. Delivery on the standard service is via courier, will require a signature and we aim to deliver within 5 working days. This service will only arrive on working days.

Courier delivery; The majority of our parcels will be sent via a courier, the bulk of which are with APC Streetwise. Please be aware that they advertise their delivery times as anywhere between 8am - 6pm Monday to Friday. We are not able to dictate to them a time slot. And in most cases a signature will be required.

New! For 2020 – Putney EmbankmentClick & Collect service; New for 2020 finds our first ever collection point on the Putney Embankment. Please select Pick Up at checkout to activate the service

NB; For orders to mainland Europe and Rest of World, the cost for carriage is calculated on order package weight and final destination. The price given at checkout is a guide only and an accurate postage cost will be calculated and invoiced to you if a supplement is required. If you would like to know this figure before despatch please feel free to contact us for a quote. Please be advised that if your order is sent via courier outside of the EU you may need to pay for import/custom taxes after the order has been delivered to you. This is standard procedure by the courier to ensure that your order is delivered to you as soon as possible and not delayed in customs. These charges are solely dependent on your local customs office and the courier, we have no control over these charges. We would kindly suggest contacting your local customs office for more information and advice. Additional charges for customs clearance must be borne by you; unfortunately, we have no control over these charges and cannot predict what they may be. We are unable to reimburse any costs incurred regardless of the circumstances.

ANTIFOUL & PAINT ORDERS; Please be aware that we can only send antifoul & Paint products within GB Mainland. We CANNOT send antifoul & paint outside of GB Mainland. If you have any questions regarding this please feel free to contact our Mail order department.

LIFEJACKETS & CO2 CANNISTERS; Please be aware that we cannot currently send lifejackets with CO2 cannisters included outside of GB Mainland

LIQUIDS & CHEMICALS; Please note we are unable to deliver liquids or chemicals overseas or to highlands and island addresses. We will also have to use a courier service within GB Mainland for liquids or chemicals.

SALE OF KNIVES; In accordance with UK Law (The Offensive Weapons Act 1996), we are unable to sell knives to anyone under 18 years of age. We are unable to send knives to overseas destinations. You must upload a copy of a valid identity document to your order at time of ordering or your order will be cancelled. Knives must be sent on a signature courier service. Valid forms of ID are EU Passports, EU Photocard Driving Licence, MOD Form 90 ID Card, EU Member State National Identity Card, “PASS” ID Cards.


Last Updated 2nd September 2020

Our returns policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange.

To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

To complete your return, we require a receipt or proof of purchase.

Please do not send your purchase back to the manufacturer.

To read our full returns and exchanges policy, please click here.


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