FNM HPEP 225 Installation Manual page 20

Electrical connection of the batteries in case of twin installation
Here below you will find the scheme for the electrical connection of the batteries in case of twin installation.
If you look further below, you will find another scheme which is referred to the case when another battery
(for onboard services such as TV, refrigerator, etc.) is used (suggested scheme). Such connections use
selection switches, which you can easily find on the market.
Alternator
engine 1
Engine starter
engine 1
Electronical connection for batteries
Here below you will find a detailed description of the electrical connection of the batteriesin the case that it
is necessary to use an auxiliary battery. As you will be able to see, this scheme uses a device that makes
sure that the alternator charges also the auxiliary battery without having the auxiliary battery getting
discharged by transferring power to the engine battery. This device is an automatic selection switch.
Obviously in case there is a twin installation with two engines on the same boat, this scheme refers to the
auxiliary battery and to the battery and alternator of one of the two engines:
TWO ENGINES – TWO BATTERIES
Selection switch
Battery 1
TWO ENGINES – TWO STARTING BATTERIES –
ONE DOMESTIC BATTERY – TWO SELECTION SWITCHES
Selection switch
Alternatore
motore 2
Engine starter
Battery 2
Engine 2
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