Vetus EAIR04024 Manuel D'installation page 15

6 Electrical System
The electrical wiring between the electric motor and the motor con-
troller has already been installed. The installation has an insulated
return.
- 24 V
MCV
Boosted charge
+ 12 V
CAN-bus
+ 24 V
Keeps battery cables free from the E-Air housing and sharp
6.1 MCV boosted charge function
Using the MCV boosted charge function, the 24 Volt E-Air motor can
be used in an (existing) 12 V onboard network.
By connecting a 12 Volt battery bank to the MCV boosted charge
connection, the 24 Volt, E-Air, battery bank is charged. An additional
charging facility is not required. See page 72 for the connection
diagram.
The MCV boosted charge function is only suitable for
lead-acid batteries as standard.
6.2 Batteries
VETUS can provide maintenance-free batteries of the type AGM (Ab-
sorbed Glass Mat), that, with approx. 375 charge cycles to a depth of
discharge of 70%, are excellently suited to electric propulsion.
Starter batteries are not suitable for an electric propulsion system.
Instead, semi-traction or traction batteries should be used.
6.3 Battery capacity
The following points play an important role in determining the bat-
tery capacity:
- Boat characteristics (length of waterline, weight, hull shape)
- Sailing style
- Desired range
- Battery type
Installation manual E-Air electric propulsion
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Table 'Power consumption indication displacement vessel' on page
16 gives an indication of the power consumption (energy con-
sumption) of a displacement vessel at different lengths and speeds.
The power consumption can then be used to calculate the sailing
time. See example below:
1. Determining battery capacity
For a boat with a length of 6 meters and a desired sailing speed of
8.8 km/h (4.7 knots) an indicative power input of 2.1 kW applies.
The desired sailing time is set at a minimum of 6 hours, continuous
sailing. This results in a required battery capacity of 2.1 x 6 = 12.6
kWh.
2. Determine battery pack
A battery pack of eight AGM batteries, C20 value 220 Ah, 12 V
series parallel (2 x 12 V and 4 x 220 Ah) switched to a 24 V battery
pack gives a usable battery capacity of ((220 x 4) x (2 x12) x 0.7) =
14.8 kWh.
3. Sailing time calculation (indication)
Based on the energy consumption of 2.1 kW, this gives a sailing
time of (14.8 / 2.1) more than 7 hours.
6.4 Battery installation
The following points must be taken into account when installing the
batteries:
Always follow the warning and safety instructions as stated
in the battery manual.
- Batteries must be installed in a dry, well-ventilated space.
- Ventilation is important because small quantities of explosive gas
can be produced while charging. If necessary, install a system of
forced ventilation.
- Always install batteries above the bilge water level.
- Batteries must be fixed securely to prevent damage to the casing.
Preferably fit batteries in a tray.
- Ambient temperature may not exceed 60 degrees C (140 de-
grees F). Never place batteries in direct sunlight!
- The batteries must be easily accessible for maintenance.
- Never fit switches or other electrical equipment in the vicinity of
batteries; possible sparks could cause an explosion.
- Prevent metal objects from accidentally coming into contact with
a battery terminal.
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