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What factors should I consider

when choosing a battery



How many battery banks will you be

charging? Take into account service

battery, starter, bowthruster, etc. Also

consider any possible future extension

of your system

(= sufficient battery

charger outputs)



The battery charger must have the

same voltage as the battery, i.e. 12 V

battery voltage = 12 V battery charger.

And 24 V battery voltage requires a

24 V battery charger.


Charging the batteries safely and

quickly requires sufficient charge


(measured in amps). See the

battery charger specifications in this

Powerbook for the recommended



For the simple and often cheaper battery

chargers, the charge current is specified

for the nominal battery voltage (= 12

or 24 V). Charging a battery requires a

higher charge voltage, namely 14.4 or

28.8 V. If the charge current drops at this

(higher) charge voltage, it will take much

longer for the battery to be charged. This

results in a shorter lifespan of the battery

or a longer generator time (if the battery

charger is powered by a generator).

Battery chargers from Mastervolt

provide a full charge current, even at

a high charge voltage and high

ambient temperatures. This ensures

short charging times and an optimal

lifespan for your batteries.


What type of battery can I charge?

Mastervolt battery chargers are suitable

for all types of batteries. Full details can

be found in the battery charger specifi­

cations under ‘Charge characteristic’.

Mastervolt recommends choosing a

battery charger with sufficient capacity

and, if possible, connecting it to a battery

temperature sensor and battery voltage

sense. Always connect Lithium Ion bat-

teries in accordance with the supplied

instructions and follow the installation

guidelines carefully (temperature com-

pensated charge is not needed).


Can I charge different types

of Lithium Ion batteries?

Most Mastervolt battery chargers can

charge Lithium Ion batteries. When

using the modern Mastervolt Lithium

Ion batteries (MLI and MLS series), free

downloadable configuration software

(MasterAdjust) allows you to simply

adjust the battery charger. Other charge

characteristics can also be easily installed.

Do note that all Lithium Ion batteries

should be installed in accordance with

the manufacturer’s instructions.


Can a Mastervolt battery

charger remain connected

throughout the winter?

Yes, that’s not a problem. Mastervolt

battery chargers are safe to use and it is

even better for the batteries themselves.

The charge voltage is regulated in accor­

dance with the battery temperature to

ensure the batteries remain in optimum

condition, increasing their lifespan.

The 3-step+ charging method ensures a

monthly absorption cycle so the battery

stays active.


I sometimes have a limited fuse

rating via the AC grid. Can I still

use a large battery charger?

Yes, you can


All Mastervolt battery

chargers and Combis are fitted with the

latest electronics, reducing their power

consumption by about 40 % compared

to conventional battery chargers. For

example, the power intake of Mastervolt

12-volt battery chargers is summarised

below for 230 V models. The levels of

current specified are relevant to maximum

capacity operation, i.e. at the moment the

battery charger supplies its full capacity.

In addition, each battery charger with

a charge current higher than 15 A (12

V) can be equipped with a remote

control panel. This is not useful for

smaller battery chargers as the current

consumption will be minimal. Using

a remote control panel allows you to

further reduce the outgoing charge

current, as a result of which the battery

charger uses even less power from the

grid. This prevents fuses from blowing,

but will slightly increase the charge time.

Frequently asked

questions about

battery chargers

ChargeMaster 12/10

0.9 amperes

ChargeMaster 12/15

1.2 amperes

ChargeMaster 12/25

1.9 amperes

ChargeMaster 12/35

2.5 amperes

ChargeMaster 12/50

3.8 amperes

ChargeMaster 12/70

5.2 amperes

ChargeMaster 12/100

7.4 amperes

EasyCharge Portable 1.1A

0.3 amperes

EasyCharge Portable 4.3A

0.8 amperes

EasyCharge 6A

0.5 amperes

EasyCharge 10A

0.8 amperes


A 200 Ah Gel battery requires a battery

charger of at least 25 amp. When

multiple loads are connected during the

charging process (e.g., heaters, refri­

gerator, lighting) a battery charger of

50 amp is needed. If the battery charger

is powered via a generator instead of

the grid, a battery of 100 amp would be

recommended. A larger battery charger

shortens the charge times and allows

the generator to operate for shorter

periods. This enhances comfort levels

and is better for the environment.