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Equipment for a Modern Gaffer
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Batteries
and Charging
Choose the 'Equipment' button to return to the
Equipment
Index.
Why a
section
on batteries?
Well partly because I spent 15 years of
my life working for a battery manufacturer and so a decent
battery installation was a MUST when specifying the boat.
There are many advantages to Nickel
Cadmium batteries on a boat: long life, greater operating temperature
range,
little voltage drop-off with increasing discharge, and the ability to
use
a greater proportion of their rated capacity. They are however
VERY
expensive, even when you work for the manufacturer.
Technically we have two quite different
electrical requirements on our boats: a very high current for a very
short period is
needed for engine starting, whilst a modest discharge current is
required
for as long as possible to power our domestic services.
Ideally
we would use different types for the two functions. But, what
happens
when one fails? A true deep-discharge type will not be able to
provide
the cranking amps needed to start your engine, whilst a small engine
starter
won't provide the discahrge capacity to keep the lights (and the
instruments,
and the fridge) going for too long. Having decided on the type of
batteries
to use, how about keeping them properly charged, and how do you know
just
what state of charge they are in?
This
section
explains the solution we finally decided upon, with some of the
justification
for our choices.
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1. The Batteries |
Sowester "Super Marine" ( 80Ah + 130Ah) |
Sowester
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These lead calcium batteries
are a
hybrid between a deep discharge and engine starting battery. They
were
chosen as the best compromise between price, technology, and the desire
for
an all-purpose power source.
We have a 130Ah model for domestic
services and an 80Ah version for engine starting.
The two batteries are totally isolated
from one another under all normal circumstances. A third battery
switch
allows one battery to supply both functions in an emergency. [Email me
for
a basic circuit diagram.]
These batteries are manufactured by
MBD, whose Technical Department can be contacted on freephone 0800
393674
(in the UK). |
Chione T |
London |
O/N 901053 |
R.T. 6 54/100 |
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2.
Battery Charger (Mains) |
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3. Voltage Regulator |
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4. Battery Monitor |
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© Geoff
& Ann Johnson , February 2008
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