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Under normal conditions, gel, AGM and Lithium Ion batteries

produce little or no dangerous hydrogen gas. The little gas that

escapes is negligible. However, just like with all other batteries,

heat is generated during charging. To ensure the longest possible

lifespan, it is important for this heat to be removed from the

battery as quickly as possible. The following formula can be

used to calculate the ventilation required for Mastervolt battery


Q = 0.05 x I x f1 x f2 x n

Q = required ventilation in m³/h

I = maximum charge current of the battery charger

f1 = 0.5 reduction for Gel batteries

f2 = 0.5 reduction for closed batteries

n = number of cells used

(a 12-volt battery has six cells of 2 volt each)

Returning to the example of a 12 V/400 Ah battery set and an

80-amp charger, the minimum ventilation necessary will be:

Q = 0.05 x 80 x 0.5 x 0.5 x 6 = 6 m³/h

This air flow is so small that normally natural ventilation will be

sufficient. If the batteries are installed in a closed casing, two

openings will be needed: One on the top and one underneath.

The dimensions of the ventilation opening can be calculated

using the following formula:

A= 28 x Q

A = opening in cm²

Q = ventilation in m³

In our case, this amounts to 28 x 6 = 168 cm²

(around 10 x 17 cm) for each opening.

Lithium Ion batteries do not produce any hydrogen gas and are

therefore safe to use. When batteries are charged quickly there

is some degree of heat production, in which case the above

formula can be used to remove the heat.

Contact your installer for larger systems with multiple battery



Seven good reasons for

installing a Mastervolt

battery monitor:


It will keep you truly informed,

giving both a read-out in

percentages and the relevant

digital data.


It will give you exact information

on the amount of Ampere-hours

used per day/week/month or year.

You can even control your kW/h

consumption, just like at home.


It has a time remaining function,

indicating the exact time, in

minutes and hours, that the

battery can be used.


It doubles as a digital voltmeter for

one or two batteries (depending

on model).


It will indicate the charge/

discharge current of the entire

onboard consumption.


It is ‘intelligent’ and will store

the number of charge/discharge

cycles and the intensity of

the discharging and charging

processes in its memory.


It can also function as an active

warning system if fitted with

a high/low voltage alarm. A

potential-free contactor can give a

signal to an acoustic alarm or even

an automatic start/stop system for

the generator.