Electrical System; Mcv Boosted Charge Function; Batteries; Battery Capacity - Vetus EAIR05024 Installation Manual

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
8 - 10 Nm
(6 - 7 ft.lbf )
Keeps battery cables free from the E-Air housing and sharp
Connect all negative conductors! A floating negative causes
system faults!
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

The battery voltage should be 24 V nominal, with an operating range
between ≥22 V and ≤30 V. With an absolute maximum of 33 V.
The integrated motor controller limits the output as from 22 V and
stops at 19.5 V. This prevents excessive battery discharge.
Starter batteries are not suitable for an electric propulsion system.
Instead, semi-traction or traction batteries should be used.
VETUS can supply various maintenance-free batteries. For example
type AGM (Absorbed Glass Mat), DeepCycle or lithium 4-cell LiFePO4
are suitable for electric propulsion.
Installation manual E-Air electric propulsion
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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
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, maximum deep discharge
of 70%, 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 x 12) x 70%) = 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.
Balance the voltage of batteries connected in series. Check
individual battery blocks and make sure the voltage between
them is equal.
- 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!
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