Beta Marine Beta 14 Installation Manual page 19

3. All our engines are supplied with one battery charging
alternator, sometimes two. Our electric starting circuit
is nominal 12 volts and we fit as standard a 40 amp
battery charging alternator up to Beta 25, and a 70
amp alternator from the Beta 30.
Typical starter motor ratings with Kubota engines
Starter Capacity (kW)
Less than 800cc 0.8 - 1.0
800 to 1,900cc 1.0 - 1.4
1,900 to 3,000cc 1.4 - 2.5
Over 3,000cc 2.5 - 3.0
5. If you require a domestic battery bank you will need to
calculate your power requirements, and then multiply
that by the number of hours you will need this power
(before you are able to re-charge the batteries). To
keep the installation simple and reliable we would
recommend a second alternator for a domestic battery
bank.
6. Battery charging alternators must be suitable for
the battery bank size. With 'Lead Acid' batteries it
is recommended that if you wish to achieve a long
battery life of 5 years and more - your alternator
should be charging in Amperes at about 10 to 20
percent of the battery bank in 'Ampere Hours' (20 Hr
rate).
Generally it is very easy to recharge to about 80
percent of battery capacity, but the last 20 percent is
important if you wish to achieve a long battery life,
and this can require an overnight charge. Battery life
and recharging tends to be a compromise and it is
generally recommended that the alternator output 'in
amperes' is not more than 25 percent of the 'Ampere
Hours' rating of the battery bank. The battery charging
system must be a balanced solution; you must have
enough battery capacity but bear in mind the recharge
capability.
4). Battery size depends upon your requirements. For
Suggested Minimum Battery Size
Typical AH
Engines @ 20 hour rate
Beta 10 to 20 35 to 50 AH
Beta 25 to 38 65 to 75 AH
Beta 43 to 70 100 to 120 AH
Beta 75 to 105 150 to 180 AH
7. Batteries must be in good condition and must hold
8. The maximum charging voltage for a Lead Acid battery
9. Battery terminals and connections must always
19
starter motor batteries the battery size should be
based upon the starter motor requirements - table
below, and never be of less capacity than the battery
manufacturers recommendation. (You could oversize
your battery by up to 20% to allow for gradual loss of
capacity due to age and temperature etc.) - If in doubt
- ask.
Typical AH
@ 5 hour rate
28 to 40 AH
53 to 62 AH
80 to 96 AH
120 to 144 AH
Generally it will take as long to recharge a battery as
it does to discharge a battery. I know that this is an
obvious statement but you can only recharge your
batteries when the engines is running, so if you only
use the engine for entering and leaving a marina you
may need an alternative solution for recharging your
batteries. Solar panels can be a good solution for
keeping batteries 'topped up'.
voltage. An idle standing battery would be expected to
be at least 12.6 volts and we would like to see at least
12v on the starter motor terminals. (After a full charge
the terminal voltage drops quickly to 13.2 V and then
slowly to 12.6 Volts).
is about 14.8 volts, above this voltage damage will
occur. We would expect a maximum output voltage
from our battery charging alternators of something like
14.8 volts at no load. At 50 percent load the voltage
drops to 14.3 to 14.4 volts and at full output the
voltage is 13.5.
be kept clean, in good condition and tight. Faulty
connections can lead to poor performance and even
(in extreme conditions) explosion.
Typical CCA
(Cold Cranking Amps)
350 to 400
450 to 540
580 to 670
1050 to 1200