Equipment for a Modern Gaffer
Choose the 'Equipment' button to return to the
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
little voltage drop-off with increasing discharge, and the ability to
a greater proportion of their rated capacity. They are however
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
for as long as possible to power our domestic services.
we would use different types for the two functions. But, what
when one fails? A true deep-discharge type will not be able to
the cranking amps needed to start your engine, whilst a small engine
won't provide the discahrge capacity to keep the lights (and the
and the fridge) going for too long. Having decided on the type of
to use, how about keeping them properly charged, and how do you know
what state of charge they are in?
explains the solution we finally decided upon, with some of the
for our choices.
|1. The Batteries
|Sowester "Super Marine" ( 80Ah + 130Ah)
| These lead calcium batteries
hybrid between a deep discharge and engine starting battery. They
chosen as the best compromise between price, technology, and the desire
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
allows one battery to supply both functions in an emergency. [Email me
a basic circuit diagram.]
These batteries are manufactured by
MBD, whose Technical Department can be contacted on freephone 0800
(in the UK).
||R.T. 6 54/100
Battery Charger (Mains)
|3. Voltage Regulator
|4. Battery Monitor
Home | Specification | The Builder | Equipment
| Who is Chione? | Picture
| Useful Sailing Links
& Ann Johnson , February 2008