Boating New Zealand - May 2018

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LION STANDARDS

AUS/NZS 3004.2:2014 has added requirements for li-on

batteries. Speciically, it is mandatory to have a battery

management safety system (BMS) – either built-in to the

battery case or mounted adjacent externally.

his BMS monitors individual cell temperatures and

voltages and must be able to disconnect all charging

sources if the voltage or temperature exceeds the

manufacturer’s speciied maximums.

Furthermore, to protect the battery from irreversible

damage, the BMS must be able to disconnect the load

if the voltage falls below the manufacturer’s minimum

speciication. An audible and visual alarm is required before

any disconnection occurs.

he standards also require the BMS to automatically

disconnect charging sources if charging voltages exceed

the battery manufacturer’s recommended limits. To

achieve this, care must be taken to ensure that any

elevated voltages from the charging sources do not cause

damage to other connected loads.

his is common when disconnecting a battery being

charged by an engine alternator. If the alternator isn’t

de-energised before the battery contactor is opened, it

can cause a high voltage spike in the vessel’s electrical

system and may damage electronic equipment.

A battery that is compliant with these standards will

almost certainly be immune from the dangerous thermal

runaway conditions that can develop in AGM, GEL or

lead-acid batteries.

Buyers of a Li-on battery should consider the above

standard.

BUYER BEWARE

Some retailers are ofering bare cells without any BMS.

Some ofer BMS systems that only do rudimentary cell

balancing without appropriate battery protection. Many

BMS systems simply disconnect the battery without any

warning, resulting in possible damage to other electronics.

hey don’t comply with NZ standards for

electromagnetic radiation or susceptibility – their BMS

may interfere with other installed electronics.

So how does a buyer diferentiate between Li-on

batteries?

Ask for written proof that the product meets all the

appropriate standards. If it doesn’t, you may end up with

an installation that, at best, returns poor battery life and,

at worst, is dangerous. BNZ

Compared to lead-acid,

they also have some

notable dierences.

BOATINGNZ.CO.NZ

FOR FURTHER INFORMATION VISIT http://www.enertecmarinesystems.com

C800

for boats to 11m

$1243. 15

including switch

C1600

for boats to 14m

$2283. 90

including switch

C400

for boats to 7m

$902. 75

including switch

CH400 Marine

$

1279. 95
      including switch

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A James Nilsson Seawinch gives you fast recovery

with plenty of reserve power and low battery drain.

Auto brake prevents back run for safety and control.

Install or remove in minutes. NEW ZEALAND made.

Lower ratio models are available for slower speed

utility and docking operations. Prices are for 12v DC.

24v option extra. Prices include GST.

V900

Rope/Chain or All Chain Option.

For Effortless Anchor Recovery.

Suitable for boats up to 10 mtrs.

$2043. 55 inclusive

CHS800 Marine davit winch

$

1711. 20
      control system extra

MARINE ELECTRICAL SPECIALISTS

LI-ION BATTERY

• Extremely compact

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09 414 4730

[email protected]

http://www.enertecmarine.com

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