concept Cor Meedendorp of
HOW DO LITHIUM POLYMER HOW ARE THEY MORE
and this contributes to the batteries’
here with Diederick Stam.
gives the batteries high efficiency with
this to a 80 per cent discharge in order to provide reserve power for peak
it possible to realise an extremely high number (over 5,000) of charge/
is demanded and keeps the ‘reservoir’
the battery will last at least 10 years if
some ‘spare’ energy left or it is able to
74 THE SUPERYACHT REPORT | ISSUE 132
ENGINEERS FOCUS | LITHIUM POLYMER BATTERIES
Q&A FROM THE AUDIENCE AT THE 2011 GLOBAL SUPERYACHT FORUM
between cells at all levels of charge, and
WHAT ARE THE COST IMPLICATIONS?
a cell differs by more than 5 millivolts,
lower, but the efficiency is less. If you
highest to the lowest cell and no energy
discharge it, try a lithium battery pack
is wasted. This balancing is always active
packs is enormously high. With lead-acid
least 14 kilowatts have to be put in. Four
kilowatts every cycle is just disappearing.
lifespan and efficiency of the batteries
battery pack there is as little as a three
The charging efficiency of the batteries
WHAT’S THE LIFE CYCLE, EITHER IN CYCLE MODES, CYCLE DISCHARGE MODES OR TIME SPAN, ESTIMATE ON A YACHT?
fuel into electrical energy is not a very
installed as per the clients’ requests. For
lead-acid batteries it will be nearly 1.5
example, if they want full silent periods
lost, resulting in a considerable saving
package will be different. Cycle lives of
batteries vary from 1,500 to 5,000 cycles
load. However, on board yachts electrical
for a battery pack. The life span varies and
depends on the installation, temperature
and where the battery is positioned, but it
in the evening heated. Large generators are installed that handle the peak loads
ARE THERE ANY LIMITATIONS WITH
that occur for just 5 per cent of the day.
LITHIUM POLYMER BATTERIES?
is controlled then it doesn’t matter if
it is discharged quickly or slowly. This
also applies to charging; as long as the
temperature is within limits, in theory, a
response of the energy storage system is
CAN THERE BE A SITUATION WHERE ONCE A LITHIUM POLYMER BATTERY HAS BEEN DISCHARGED IT WILL NEED TO BE REPLACED?
at a certain level. That’s why, in a good
behind the peak shaving system is that in
many cases the design of a ship is based
battery. However, this is the same with a
lead-acid battery; if it goes too low then
it never regains the power that is lost.
(air-con cycling, for example). So three
76 THE SUPERYACHT REPORT | ISSUE 132
ENGINEERS FOCUS | LITHIUM POLYMER BATTERIES
to charge the battery system, resulting in one generator to run constantly at the preferred 80 per cent of full load capacity. • Genset off at night.
Using lithium polymer batteries on superyachts will result in fewer generator noise variations, reduce cold starts and save fuel and also reduce the need for maintenance.
polymer batteries is that they give more freedom in the design and layout of a yacht. For example, the best location
FUEL EFFICIENCY BY PEAK SHAVING WITH BATTERIES
for accommodation on a sailing yacht is where the main engines are installed.
BACKGROUND &
time. That is 63kW each. This is not the
space can be used for an owner’s cabin
FUTURE PLANS
on top of a compact and silent electrical
in the bilge. Relocate the generators in
fi rst lithium polymer battery that has a
the front or the rear and the result will
Lloyd’s Certifi cate. This battery is specially
and guest can enjoy extra interior space
overcome load stress (peak loads). It is
and are being tested at the facilities of
systems, fuel and cooling water systems,
will install their lithium polymer batteries
In the diagram above, fuel effi ciency by
is the 33m yacht Inoui, a composite
Briand and being built by Vitters Shipyard
BV. Inoui is scheduled for delivery in May
• The green line represents the optimal
be partly electrical, which will result in
• The straight red line represents the
• The curved red line represents the shared load when a second generator is
*In this situation, the charge capacity of batteries can be 1C/peak up to 2C, where
generators running in ineffi cient load
1C = 1 x nominal capacity = 100A or
• The green peaks represent power now supplied by the EST battery peak
To comment on this article, email issue132@superyachtreport.com with subject: Lithium polymer batteries 78 THE SUPERYACHT REPORT | ISSUE 132
TERRA TREATMENT - the treatment you can trust! The Significance of Sutherlandia - PRO Sutherlandia has application in the treatment of all conditions that are associated with impaired immune function, stress or general debility of the body. It strengthens the body's natural immune response, supports the healing system and accelerates the recovery process. The full botanical name of Suther
Herkennen en hanteren van hersenschade in de werksituatie M a rc o Ve rs te g e n , J a n L a n s e r, H e i lw i n e B a k ke r Medewerkers van tweede- en derdelijnszorgin-van hersenschade tijdig te onderkennen, takenstellingen, zoals Balans & Impuls en de Geheu-en werksituatie aan te kunnen passen aan de ver-genpoli van het Rijnlandziekenhuis, worden dik-minderde mogelijkheden, en
ENGINEERS FOCUS | LITHIUM POLYMER BATTERIES
to charge the battery system, resulting in one generator to run constantly at the preferred 80 per cent of full load capacity. • Genset off at night.