CTEK D250S DUAL, 1044, 1058, SMARTPASS User Manual

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CONGRATULATIONS

on the purchase of your new CTEK professional battery man­agement unit. This unit is part of a range of professional bat­tery chargers from CTEK SWEDEN AB. It represents the latest
technology in battery charging.
Using the CTEK D250S DUAL and SMARTPASS products, you
can maximize the performance of your 12V DC source.

IMPORTANT SAFETY
INSTRUCTIONS

CALIFORNIA PROPOSITION 65

WARNING: This product contains chemical known to the state
of California to cause cancer or reproductive toxicity.

1.

SAVE THESE INSTRUCTIONS

– This manual contains important safety and operating
instructions for battery charger Models D250S DUAL
(1044) and SMARTPASS (1058).

2. Use of an attachement not recommended or sold by the
CTEK may result in a risk of fire, electric shock, or injury to
persons.

3. When charging, batteries can emit explosive gases,
therefore it is essential to prevent flames and sparks. The
charger is designed for charging 12V lead-acid batteries.
Do not use for any other purpose.

4. Always provide good ventilation when charging.

5. Make sure that cables used have sufficient cable area,
see CABLE DIMENSIONS.

6. Do not operate charger with damaged cord - replace the
cord immediately.

7. Never operate the charger if it has received a sharp blow,
been dropped or otherwise damaged in any way; take it
to a CTEK representative.

8. Do not disassemble charger; take it to the retailer when
service or repair is required. Incorrect reassembly may
result in a risk of electrical shock or fire.

9. Disconnect the products before attempting any mainte­nance or cleaning

10.

WARNING - RISK OF
EXPLOSIVE GASES

a) WORKING IN VICINITY OF

A LEAD-ACID BATTERY IS
DANGEROUS. BATTERIES

MANUAL

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GENERATE EXPLOSIVE GASES
DURING NORMAL BATTERY
OPERATION. FOR THIS
REASON, IT IS OF UTMOST
IMPORTANCE THAT, YOU
FOLLOW THE INSTRUCTIONS
EACH TIME YOU INSTALL THE
CHARGER.

b) To reduce risk of battery explosion, follow these instruc-

tions and those published by the battery manufacturer
and the manufacturer of any equipment you intend to use
in vicinity of battery. Review cautionary marking on these

products and on engine.
c) Disconnect battery poles before installation
d) D250S DUAL is not reverse polarity protected.

11.

PERSONAL PRECAUTIONS

a) Consider having someone close enough by to come to

your aid when you work near a lead-acid battery.
b) Have plenty of fresh water and soap nearby in case bat-

tery acid contacts skin, clothing or eyes.

c) Wear complete eye protection and clothing protection.

Avoid touching eyes while working near battery.

d) If battery acid contacts skin or clothing, wash immediately

with soap and water. If acid enters eye, immediately flood
eye with running cold water for at least 10 minutes and
get medical attention immediately.

e) NEVER smoke or allow a spark or flame in vicinity of bat-

tery or engine.

f) Be extra cautious to reduce risk of dropping a metal tool

onto battery. It might spark or short-circuit battery or other
electrical part that may cause explosion.

g) Remove personal metal items such as rings, bracelets,

necklaces, and watches when working with lead-acid
battery. A lead-acid battery can produce a short-circuit
current high enough to weld a ring or the like to metal,
causing a severe burn.

h) Use charger for charging a LEAD-ACID battery only. Do

not use battery charger for charging dry-cell batteries that
are commonly used with home appliances. These batter­ies may burst and cause injury to persons and damage to
property.

i) Never charge a frozen battery.

12. PREPARING TO CHARGE

a) If necessary to remove battery from vehicle to charge,

always remove grounded terminal from battery first. Make
sure all accessories in the vehicle are off, so as not to
cause an arc.

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b) Be sure area around battery is well ventilated while bat-

tery is being charged.

c) Clean battery terminals. Be careful to keep corrosion from

coming in contact with eyes.

d) Add distilled water in each cell until battery acid reaches

level specified by battery manufacturer. Do not overfill.
For a battery without removable cell caps, such as valve
regulated lead acid batteries, carefully follow manufac­turer’s recharging instruction.

e) Study all battery manufacturer’s specific precautions while

charging and recommended rates of charge.

f) Determine voltage of battery by referring to vehicles

manual.

13.

CHARGER LOCATION

a) Never place charger directly above battery being

charged; gases from battery will corrode and damage
charger.

b) Never allow battery acid to drip on charger when read-

ing electrolyte specific gravity or filling battery.

c) Do not set a battery on top of charger.

14. FOLLOW THESE STEPS WHEN

BATTERY IS INSTALLED IN
VEHICLE. A SPARK NEAR

BATTERY MAY CAUSE BATTERY
EXPLOSION. TO REDUCE RISK
OF A SPARK NEAR BATTERY:

a) Position cords to reduce risk of damage by hood, door or

moving engine part.

b) Stay clear of fan blades, belts, pulleys, and other parts

that can cause injury to persons.

c) Check polarity of battery posts. POSITIVE (POS, P, +)

battery post usually has larger diameter than NEGATIVE
(NEG, N, -) post.

d) Determine which post of battery is grounded (connected)

to the chassis. If negative post is grounded to the chassis
(as in most vehicles) see (e). The battery charger can

not be used with positive-grounded batteries.

e) For Negative-grounded vehicle, connect POSITIVE con-

nector from battery charger to POSITIVE (POS, P, +)
ungrounded post of battery. Connect NEGATIVE connec­tor from battery charger to vehicle chassis or engine block
away from battery. Do not connect to carburetor, fuel
lines, or sheet-metal body parts. Connect to a heavy gage
metal part of the frame or engine block.

f) When disconnecting charger, always do so in reverse

sequence of connecting procedure and break first connec­tion while as far away from battery as practical.

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15. FOLLOW THESE STEPS WHEN

BATTERY IS OUTSIDE VEHICLE.

A SPARK NEAR BATTERY MAY

CAUSE BATTERY EXPLOSION.

TO REDUCE RISK OF

A SPARK NEAR BATTERY:

a) Check polarity of battery terminals. POSITIVE (POS,

P, +) battery post usually has a larger diameter than

NEGATIVE (NEG, N, -) post.
b) Attach at least a 24-inch-long 6-gauge (AWG) insulated

battery cable to NEGATIVE (NEG, N, —) battery post.
c) Connect POSITIVE charger connector to POSITIVE (POS,

P, +) post of battery.
d) Position yourself and free end of cable as far away from

battery as possible – then connect NEGATIVE charger

connector to NEGATIVE (NEG, N, -) post of battery.
e) Do not face battery when making the final connection.
f) When disconnecting charger, always do so in reverse

sequence of connecting procedure and break first connec-

tion while as far away from battery as practical.

SAFETY

•D250S Dual and SMARTPASS is designed for 12V lead­acid batteries. Do not use the unit for any other batteries.

•Disconnect battery poles before installation

•D250S Dual is not sprak proof.

•The installation must include a fuse according to recommen-

dations in table “CABLE DIMENSIONS”.

All installations on boats must follow
ISO 10133. Please note!

1. Connections from the battery must be fused close to the
battery.

2. Batteries must be permanently mounted in ventilated areas.

3. Cables must be placed in tubes, separated from cables for
110/230V (shore power), or be attach to the surface every
300mm.

4. Cables in the engine room must be rated to withstand
70°C/158°F

5. For a permanently connencet battery charger:
GROUNDING INSTRUCTIONS— This battery charger
should be connected to a grounded, metal, permanent

WARNING!

D250S DUAL and SMARTPASS is not

reverse polarity protected.

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wiring system; or an equipment-grounded conductor should
be run with circuit conductors and connected to equipment­grounded terminal or lead on battery charger. Connections
to battery charger should comply with all local codes and
ordinances.

D250S DUAL

The D250S Dual has 2 inputs. The Service battery will be
charged from the alternator, solar panel, or both in combina­tion. The solar panel adjusts itself to the Starter battery voltage.
The Starter battery will be charged and maintained directly by
the solar panel if the Service battery is fully charged.

D250S DUAL

FEATURES:

•Multi-step 20A temperature compensated battery charging
and battery maintenance.

•Battery separation of Starter and Service batteries.

•Maximum power point tracking for solar panels charging

the Service battery.

•Two power source inputs (alternator, solar, wind, Supply
battery and other).

•Coordination of the two inputs, allowing parallel operation.

•The solar input will also maintain the Alternator battery.

•Built in battery guard for the Alternator battery.

D250S DUAL

12V

+OUT

+IN

+IN

Temperature sensor
L:2m/6,5 feet

Service

battery +

Alternator

battery +

Solar panel +

Vehicle ground/

Solar panel –

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DEFINITIONS SOLAR PANEL

Depending on the application, it could also be referred to as

- PV panel

- Photovoltaic panel

CONNECTIONS

- Solar panel

- Wind power

DEFINITIONS SERVICE BATTERY

Depending on the application, it could also be referred to as

- House battery

- Domestic battery

- Consumer battery

CONNECTIONS

- Electrical equipment

- Battery bank

- SMARTPASS service battery +

DEFINITIONS ALTERNATOR BATTERY

Depending on the application, it could also be referred to as

- Starter battery

CONNECTIONS

- Trailer coupling

- Alternator

- SMARTPASS Alternator +

D250S DUAL LAMPS

Error lamp

Power lamp

Solar power
lamp

Alternator
battery lamp

Service
battery lamp

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D250S DUAL LAMP ERROR INDICATION

EXPLANATION RECOMMENDATION

High temperature detected at either unit or ser­vice battery

Consider relocationg unit and/or service battery

Service battery connection problem detected Check Service battery connection and fuse

Service battery connection problem detected Check Service battery connection and fuse

Service battery connection problem detected Check Service battery connection and fuse

Steady lamp Flashing lamp

D250S DUAL LAMP FUNCTION

LAMP FUNCTION

Power lamp

D250S DUAL connected
correctly, ready to use

Alternator battery lamp Alternator running

Service battery lamp

Charging of Service
battery

Solar panel lamp Solar panel in operation

D250S DUAL LAMP INDICATION
DURING NORMAL OPERATION

LIT WITH A STEADY GLOW

Service battery charged by the
alternator

Service battery charged by the solar
panel

Service battery charged by both the
alternator and solar panel

Service battery fully charged.
Alternator battery maintained by the
solar panel

When the Power lamp flickers, the unit
is in power saving mode

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SMARTPASS

SMARTPASS can operate as a stand-alone unit, but works best
in combination with D250S Dual. The SMARTPASS creates
a priority path for charging the Service battery to recharge
it more quickly and efficiently. Attached energy sources like
solar, wind or shore power will charge both the Service and
the Starter batteries through the SMARTPASS. Service batteries
that are overheated due to age, high ambient temperature or
other battery problems will be protected from high alternator
current.

SMARTPASS

FEATURES:

The CTEK SMARTPASS adds additional functionality for higher
output alternators, larger battery banks and/or high parallel
loads.

•Separation of consumers and Service batteries during
charging, which improves the charging capacity signifi­cantly, and lowers the consumer voltage, which increases
expected service life of lights and other electronics.

•Service battery watch, which avoids harmful deep dis­charges that otherwise would shorten battery life. The bat­tery watch also protects navigation, radio and emergency
light from being out of electricity.

•Over-temperature protection of Service battery. High bat­tery temperature could significantly reduce battery life.

•Maintenance charge of Starter battery, which simplifies
installation with fewer components.

•Simplified installation of AC/DC chargers (shore power).
Only one output from the AC/DC charger needed.

The CTEK SMARTPASS is designed to work together with
1-2 CTEK D250S DUAL, but can also be used alone.

+IN +OUT

+OUT

SMARTPASS12V

Temperature sensor

L: 2m/6.5 feet

Negative cable

connection M8

L: 0.3m/12 inches

Consumers +

Alternator

battery +

Service

battery +

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DEFINITIONS ALTERNATOR BATTERY

Depending on the application, it could also be referred to
as

- Starter battery

CONNECTIONS

- Trailer coupling

- Solar panel

- Wind power

- Alternator

- D250S DUAL Alternator battery +

DEFINITIONS SERVICE BATTERY

Depending on the application, it could also be referred to
as

- House battery

- Domestic battery

- Consumer battery

CONNECTIONS

- Electrical equipment

- Battery bank

- D250S DUAL Service battery +

DEFINITIONS CONSUMERS

Depending on the application, it could also be referred to
as

- Electrical equipment +

CONNECTIONS

- Electrical equipment

SMARTPASS LAMPS

+OUT

2

3

1

4

Error lamp
Power lamp

1. Service battery
charging lamp

2. Alternator battery con­sumption lamp

3. Alternator battery
charging lamp

4. Service battery
consumption lamp

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SMARTPASS LAMP FUNCTION

LAMP STEADY FLASHING

Power lamp Unit ready to use

2

Alternator battery
consumption lamp

Engine running Too high current through relay

1

Service battery
charging lamp

Charging Service battery

4

Service battery
consumption lamp

Consumers powered by Service battery Too high current through relay

3

Alternator battery
charging lamp

Alternator battery maintained by Service battery Too high current through relay

Error lamp

Indicates that an error has occurred. See the
table to the right.

SMARTPASS LAMP INDICATION DURING NORMAL OPERATION

EXPLANATION

High current from alternator to service battery. Consumer powered by alternator
Reduced current from alternator to service battery. Consumer powered by alternator
Consumer powered by alternator. Battery charged by D250S DUAL charger
Pulse maintenance of starter battery

2

1 4 3

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SMARTPASS LAMP ERROR INDICATION

2 1 4 3

EXPLANATION RECOMMENDATION

Service battery overheated Check condition and/or installation

Too high current through or temperature
at internal relay. Too high Service bat­tery charge current.

Check service battery. Reduce alternator size or
add one more D250S DUAL in parallel. Service bat­tery bank too deeply discharged.

Too high current through or temperature
at internal relay. Too many consumers
connected at the same time.

Consider relocation of unit. Reduce power usage.

Too high current through or temperature
at internal relay. Too high current to
starter battery.

Starter battery problems, check battery.

Too high current through or temperature
at internal relay. Too many consumers
connected.

Relocate unit or reduce concurrent use of consumers.

Battery watch activated. Service battery
too low

Recharge Service battery

Steady lamp Flashing lamp

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INSTALLATION OF UNIT

1. Attach the temperature sensor holder on a flat surface on
one Service battery. Position it as close as possible to a
positive post.

2. Use the included drill template. Wiring is simplified if the
units are installed according to the drill template, but other
setups are possible.

3. Install the unit(s) on a surface where it can be properly
fixed and where the unit is not exposed to fuels, oils or
splashes of dirt.

4. Mount the unit with screws intended for the surface and
attach it with one screw in each of the four holes in the
corners of the unit. See picture 1. Mount the unit with M4
or ST4.2 screws. The required torque depends on the sur­face for mounting. Fig. 1 shows a CTEK D250S. The same
procedure is used for all devices.

5. Attach the cables and mount the cable screws with a
torque of 7 Nm/62 Lb-In. Use tool – hand power without
tools is not enough.

6. The ground cable of the SMARTPASS should be connect­ed to the ground screw of the DUAL or to any convinient
ground connection point.

INSTALLATION OF CABLES

Figure 1

Figure 2

2Nm/18 Lb-In

7Nm/62 Lb- In

Allen key

WARNING!

D250S DUAL and

SMARTPASS is not reverse

polarity protected.

Disconnect battery poles

before installation.

WARNING!

D250S DUAL is not spark

proof. Provide for good

ventilation.

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DRILL TEMPLATE

90,6mm/3,57 inches

120mm/4,72 inches

210,6mm/8,29 inches

Ø4,9 mm

0,19 inches

168mm/6⅝ inches

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SITUATION

Solar panel.

PROBLEM

A solar panel with 36 cells produces
maximum power at about 17V. Many
regulator reduce the voltage by “burning
off” energy.

SOLUTION

The D250S DUAL searches for the
Maximum Power Point and charges
the battery perfectly with very high
efficiency.

TIP 1

Mount the temperature sensor on the
Service battery.

Boat: All installation should be done in
accordance with ISO10133.

INSTALLATION SHEET 1

WARNING!

•Max23Vinput

•Donotconnecttwosolarpanelsinseries

WARNING!

D250S DUAL is not reverse

polarity protected

SOLAR PANEL

D250S DUAL

12V

+OUT

+IN

+IN

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WARNING!

Max 23V input

WARNING!

D250S DUAL is not reverse

polarity protected

SITUATION

One alternator feeding a Starter battery
and a small Service battery.

PROBLEM

The Service battery will take a very long
time to recharge due to low alternator
voltage. Due to this, the battery will
underperform and die prematurely.

SOLUTION

The D250S DUAL charges the Service
battery quickly and very efficiently. The
battery will be fully charged, produce
more and last significantly longer.

TIP 2

Refer to Tip 1.

Alternators with voltage sensor cables
should connect this on the Starter battery

Caravan/trailer: For 13-pole contact,
connect D250S DUAL alternator battery
+ to pin #9. Connect pin #13 to D250S
DUAL vehicle ground –.

INSTALLATION SHEET 2

SMALL SERVICE BATTERY

D250S DUAL

12V

+OUT

+IN

+IN

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18 • EN

SITUATION

One alternator feeding a Starter battery
and a large Service battery bank.

PROBLEM

The Starter battery will not be fully
charged and might not always be able
to start the engine.

SOLUTION

The D250S DUAL recharges the Starter
battery quickly to 100%, which guaran­tees trouble-free engine starts.

TIP 3

Mount the temperature sensor on the
Starter battery.

INSTALLATION SHEET 3

LARGE BATTERY BANK

WARNING!

Max 23V input

WARNING!

D250S DUAL is not reverse

polarity protected

D250S DUAL

12V

+OUT

+IN

+IN

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SITUATION

One alternator and a Solar panel feed­ing a Starter battery and a small Service
battery.

PROBLEM

The Service battery will take a very long
time to recharge due to low alternator
voltage. The Solar panel is difficult to
synchronize with the alternator. Due to
these issues, the battery will underper­form and die prematurely.

SOLUTION

The D250S Dual charges the Service
battery quickly and very efficiently
from both the Alternator and the Solar
panel. The Solar panel produces at its
maximum power point when the engine
is off. When both the Solar panel and
the Alternator are on, the Solar panel
adjusts to the Alternator. The battery will
be fully charged, produce more and last
significantly longer.

TIP 4

See Tip 1 and Tip 2.

INSTALLATION SHEET 4

SOLAR PANEL

WARNING!

D250S DUAL is not reverse

polarity protected

WARNING!

•Max23Vinput

•Donotconnecttwosolarpanelsinseries

D250S DUAL

12V

+OUT

+IN

+IN

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LARGE SERVICE BATTERY

INSTALLATION SHEET 5

D250S DUAL

12V

+OUT

+IN

+IN

+IN +OUT

+OUT

SMARTPASS12V

SITUATION

One alternator feeding a Starter battery
and a large Service battery.

PROBLEM

The Service battery will take a very long
time to recharge due to low alternator
voltage and restrictions in how the alter­nator current is used. The Solar panel is
difficult to synchronize with the alterna­tor. Due to these issues, the battery will
underperform and die prematurely.

SOLUTION

The SMARTPASS separates the two bat­tery banks when the engine is off. With
the engine on, the alternator charges
the service battery with its maximum
current until it has tapered off to the
D250S Dual max level. Then the D250S
DUAL charger finalizes the charge. The
recharge time is minimized. Solar panels
are easily integrated and synchronized if
a D250S Dual is used together with the
SMARTPASS.

TIP 5

See Tip 1, Tip 2 and Tip 4

Wires that are connected to both
SMARTPASS and D250S DUAL should
be connected to SMARTPASS.

WARNING!

•Max23Vinput

•Donotconnecttwosolarpanelsinseries

WARNING!

D250S DUAL and SMARTPASS is not

reverse polarity protected

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SITUATION

230/110V charger for the Service and
Starter battery.

PROBLEM

The 230/110V charger should charge
both the Service and the Starter bat­tery, and be synchronized with all other
energy sources.

SOLUTION

The single output 230/110V charger is
connected directly to the Service battery.
The Starter battery is pulse charged
through SMARTPASS.
The solar panel will also maintaince
charge the Starter battery through
SMARTPASS.

TIP 6

See Tip 1, Tip 2, Tip 4 and Tip 5

The battery cables of the 230/110V
charger are connected directly to the
Service battery.

INSTALLATION SHEET 6

CONNECTING AC/DC CHARGERS

WARNING!

•Max23Vinput

•Donotconnecttwosolarpanelsinseries

WARNING!

D250S DUAL and SMARTPASS is not

reverse polarity protected

12V

RECOND

RECOND

NIGHT

NORMAL

MODE

D250S DUAL

12V

+OUT

+IN

+IN

+IN +OUT

+OUT

SMARTPASS12V

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22 • EN

CONNECTING CONSUMERS

SITUATION

Connection of consumers to the system.

PROBLEM

Many batteries die prematurely if they
are discharged too much. Too little
power might be delivered to critical
consumers, like navigation, radio and
emergency lights.

SOLUTION

Critical consumers are connected
directly to the battery. Others, such as
refrigerator, main light and heating are
connected to the SMARTPASS. When
the Service battery is down to a critical
level, then the SMARTPASS disconnects
these noncritical consumers.

TIP 7

See Tip 1, Tip 2, Tip 4, Tip 5 and Tip 6.

High current consumers (>80A) should
be connected directly to the Service or
Starter battery.

WARNING!

•Max23Vinput

•Donotconnecttwosolarpanelsinseries

WARNING!

D250S DUAL and SMARTPASS is not

reverse polarity protected

12V

RECOND

RECOND

NIGHT

NORMAL

MODE

D250S DUAL

12V

+OUT

+IN

+IN

+IN +OUT

+OUT

SMARTPASS12V

INSTALLATION SHEET 7

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STEP 1 DESULFATION

Detects sulfated batteries. Pulsing current and voltage, removes
sulfate from the lead plates of the battery restoring battery
capacity.

STEP 2 BULK

Charging with maximum current until approximately 80% bat­tery capacity.

STEP 3 ABSORPTION

Charging with declining current to maximize up to 100% bat­tery capacity.

STEP 4 FLOAT

Maintaining the battery voltage at maximum level by providing
a constant voltage charge.

STEP 5 PULSE

Maintaining the battery at 95–100% capacity. The charger
monitors the battery voltage and gives a pulse when necessary
to keep the battery fully charged.

1

PULSE

DESULPHATION BULK ABSORPTION

1

4

2 3

FLOAT

5

VOLTAGE (V)CURRENT (A)

CHARGING PROGRAM D250S DUAL

The charger starts charging the target battery when the supply voltage exceeds 13.1V for 5 sec (engine on).
The charger stops charging the target battery when the supply voltage drops below 12.8V for 10 sec (engine off).

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24 • EN

CABLE DIMENSIONS

Recommended minimum cable dimensions in mm²

MIN CABLE DIMENSIONS

FUSE RECOM-

MENDATIONS

UNIT

CABLE

0.5m/2 ft. 1m /3 ft. 2m /6 ft. 5m /15 ft. 10m /30 ft.

+IN

4mm2/AWG12 4mm2/AWG12 4mm2/AWG12 6mm2/AWG10 10mm2/AWG8 30A

+OUT

4mm2/AWG12 6mm2 /AWG10 10mm2/AWG8 30A

Lead to ground

1.5mm2/AWG16 1.5mm2/AWG16 1.5mm2/AWG16 1.5mm2/AWG16 1.5mm2/AWG16

Connection Unit*

4mm2/AWG12 6mm2/AWG10 10mm2/AWG8 10mm2/AWG8 10mm2/AWG8

+IN

16mm2/AWG8 16mm2/AWG6 16mm2/AWG6 25mm2/AWG4 25mm2/AWG4 150A

+OUT

16mm2/AWG8 16mm2/AWG6 16mm2/AWG6 150A

*Use included connectors if possible. Consider above recommendation if the units are mounted at different locations.

D250S/D250S DUAL

SMARTPASS

20020400A D250S Dual SMARTPASS manual EU_US, print file, Print file 001.indd 24 2013-12-02 13:47:10

EN

 EN • 25

TECHNICAL SPECIFICATIONS

Charger model

D250S DUAL SMARTPASS

Model number

D250S Dual, 1044 SMARTPASS, 1058

Max input voltage

23V 23V

Charging voltage

14.4V at 25°C/77°F temperature compensated –

Charging current

20A 80A

Back current drain

Less than 1Ah/month Less than 1Ah/month

Ri ppl e*

Less than 4% –

Ambient temperature

-20°C to +50°C (-4°F to -122°F),

output power is reduced automatically at high temperatures

Charger type

5-step fully automatic charging –

Battery types

All types of 12V lead-acid batteries (WET, MF, Ca/Ca, AGM and GEL)

Battery capacity

40–300Ah 28–800Ah

Dimensions

197 x 93 x 49mm (7¾ x 3⅝ x 2 inches) L x W x H

Insulation class

IP65 (splash and dust proof)

Weight

0.73kg/1,6 lbs 0.74kg/1,6 lbs

MPP T**

Yes –

*) The quality of the charging voltage and charging current are very important. High current ripple heats the battery and ages
the positive electrode. High voltage ripple can damage other equipment connected to batteries. The battery chargers from CTEK
produce very high-quality voltage and current with low ripple
**) MPPT (Maximum Power Point Tracking) finds the best combination of supply current and voltage to maximize the power out­put. This is especially important for Photovoltaic (Solar) Panels and trailer campers with wiring constraints.

20020400A D250S Dual SMARTPASS manual EU_US, print file, Print file 001.indd 25 2013-12-02 13:47:10