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Frequently asked questions

about batteries



How long will it take before

my battery is discharged?

This depends on its capacity and the

amount of power consumed by the

connected equipment. As a rule, the

faster a battery is discharged, the less

power it supplies. This also works the

other way around: The longer it takes

before a battery discharges, the more

energy you can get from it. A 100 Ah

lead-acid battery supplies a current of

5 amps for 20 hours, during which time

the voltage does not drop below 10.5

volt. This amounts to 100 Ah. If a load

of 100 amps is connected to the same

battery, the battery will be able to power

it for only 45 minutes. After this time the

battery voltage will fall to 10.5 volt and

the battery will be empty, having supplied

no more than 75 Ah. In contradiction

to the lead-acid batteries, the capacity

of Lithium Ion batteries will not be

effected by the load connected. A Li-ion

battery will always supply 100 % capacity,

independent of the connected load.


How long will my battery last?

The lifespan of a battery is related to how

often and to what extent it is discharged.

Proper charging with the right charger is

also crucial. At a normal use for holidays

and weekends, a lifespan of between

five and seven years is quite common for

Gel and AGM batteries. When batteries

are frequently discharged you will need

to adjust the capacity. There is also an

option to use 2 volt cells. A lifespan of

15 years is not exceptional for this type

of battery as long as they have the right

capacity and are properly charged.

Lithium Ion batteries are top of the bill.

You can discharge and recharge them

super-fast and they last up to three

times as many cycles than other types

of batteries.


For more information, see chapter

‘Determining lifespan’.


What is series connection and parallel connection?

Series connection

A series connection is used to increase voltage, while keeping capacity at the same

level. Two serially connected 12 V/120 Ah batteries make a combined battery set of

24 V/120 Ah. In a series connection, the positive pole of one battery is connected

to the negative pole of the other, with the poles that remain at the ends being

connected to the system. Batteries with different capacities should never be linked

in series.


Mastervolt also supplies 2 V, 6 V and 24 V

batteries; the principle of series and parallel

connecting remains the same.

Series connection 24 V/200 Ah.

Series connection 48 V/200 Ah.

Parallel connection

12 V/400 Ah.

Series/parallel connection

24 V/400 Ah.

Series/parallel connection

If you need a 24 V battery set with a higher capacity,

you can combine series and parallel connections.

The cables from the battery to the system must be

crossed: Positive from battery 1 and negative from

battery 2 (or the last in the parallel connection).

Parallel connection

Parallel connection is used when you need to

increase your capacity. The positive leads are

connected together, as are the negative leads.

The cabling from the battery to the system should

be: Positive from battery 1 and negative from

battery 2 (or the last in the parallel connection).

Make sure there is sufficient space between the batteries

when installing multiple batteries: There should be a ‘finger’

of space between them to allow the heat to be diverted.