Cotek SK Series User manual

SK Series
Pure Sine Wave Inverter
User’s Manual

Contents
1. Important Safety
Instructions……………………………………………… 1
1-1 General Safety Precautions…………………. 1
1-2 Precautions When Working With Batteries… 1
2. Features…………………………………………………………………... 2
2-1 Application………………………………..…… 2
2-2 Electrical Performance……………..………… 3~7
2-3 Mechanical Drawings………………………… 8~9
3. Introduction……………………………………………………………… 10
3-1 Front Panel Operations……………………… 10~13
3-2 Rear Panel Operations………………….…… 14~15
3-3 Protections Features…………………….…… 15
3-4 Installation……………………………………… 16
3-5 Making DC Wiring Connections ………..….. 17~19
3-6 AC Safety Grounding………………………… 20~21
3-7 Inverter Operation……………………….…… 21
4. Troubleshooting guide……………………………………………… 22
5. Maintenance…………………………………………………………… 23
6. Warranty……………………………………………………………… 23
7. Appendices…………………………………………………………….
7-1 CE (LVD EN60950-1) Declaration of
Conformity……………………………..……
7-2 FCC Declaration of Conformity…………..
7-3 e-mark (e13) Declaration of Conformity…
7-4 UL (UL458) NOTICE OF COMPLETION..

1. Important Safety Instructions
1-1. General Safety Precautions
1-1-1. Do not expose the Inverter to rain, snow, spray, bilge or dust.
To reduce risk of hazard, do not cover or obstruct the ventilation
openings. Do not install the Inverter in a zero-clearance
compartment. Overheating may result.
1-1-2. To avoid a risk of fire and electronic shock. Make sure that
existing wiring is in good electrical condition; and that wire size
is not undersized. Do not operate the inverter with damaged or
substandard Wiring.
1-1-3. This equipment contains components which can produce arcs
or sparks. To prevent fire or explosion do not install in
compartments containing batteries or Flammable materials or in
locations which require ignition protected equipment. This
includes any space containing gasoline-powered machinery,
fuel tanks, or joints, fittings, or other connection between
components of the fuel system.
1-2. Precautions When Working with Batteries
1-2-1. 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 20 minutes and get medical
attention immediately.

1-2-2. Never smoke or allow a spark or flame in vicinity of battery or
engine.
1-2-3. Do not drop a metal tool on the battery. The resulting spark or
short-circuit on the battery of other electrical part may cause an
explosion.
1-2-4. Remove personal metal items such as rings, bracelets,
necklaces, and watches when working with a lead-acid battery,
A lead-acid battery produces a short-circuit current high enough
to weld a ring or the like to metal, causing a severe burn.
1
WARNING!
Before using the Inverter, read and
save the safety instructions.

2. Features
Pure sine wave output (THD < 3%)
Output frequency：50 / 60Hz switch selectable
Input & output fully isolation design
Low power “ Power Saving Mode “ to conserve energy
High efficiency 89~94%
Capable of driving highly reactive & capacitive loads at start moment.
Tri-Color indicators display input voltage & output load level
Loading controlled cooling fan
Advanced microprocessor
Protection：Input low voltage Overload Short circuit
Low battery alarm Input over voltage Over temperature
2-1. Application
2-1-1. Power tools – circular saws, drills, grinders, sanders, buffers,
weed and hedge trimmers, air compressors.
2-1-2. Office equipment – computers, printers, monitors, facsimile
machines, scanner.
2-1-3. Household items – vacuum cleaners, fans, fluorescent and
incandescent lights, shavers, sewing machines.
2-1-4. Kitchen appliances – coffee makers, blenders, ice markers,
toasters.
2-1-5. Industrial equipment – metal halide lamp, high – pressure
sodium lamp.
2-1-6. Home entertainment electronics – television, VCRs, video
games, stereos, musical instruments, satellite equipment.

2-2. Electrical Performance
Specification Model No.
Item SK700-112 SK700-124 SK700-148 SK700-212 SK700-224 SK700-248
Continuous Output Power 700W
Maximum Output Power (3Min.) 800W
Surge Rating 1400W
Input voltage 12V 24V 48V 12V 24V 48V
Output Voltage 100 / 110 / 120V +/- 3% 220 / 230 / 240V +/- 3%
Frequency
(Switch Selectable) 50 / 60Hz +/- 0.05%
Output Waveform Pure Sine Wave ( THD < 3% )
Efficiency (full load) 89.0% 91.0% 92.0% 91.0% 93.0% 94.0%
No Load Current Draw 1.25A 0.64A 0.31A 1.20A 0.60A 0.28A
Stand-By Current Draw 0.25A 0.15A 0.08A 0.25A 0.15A 0.08A
Input Voltage Regulation 10.5-15
VDC
21.0-30
VDC
42-60
VDC
10.5-15
VDC
21.0-30
VDC
42-60
VDC
Input Level Indicator Red / Orange / Green LED
Load Level Indicator
Failure Indicator Red LED
Protection Overload, Short Circuit, Reverse Polarity (Fuse),
Over / Under Input Voltage, Over Temperature.
Remote Control Unit CR-6 / CR-7 / CR-8 Optional
Safety UL458 EN60950-1
EMC FCC Class A
EN55022: 1997
EN55024: 1997
EN61000-3-2: 1998
EN61000-3-3: 1995
e-Mark
Operating Temperature Range 0 - 40 ℃
Storage Temperature Range -30℃to 70℃
Cooling Loading controlled cooling fan
Dimensions 295(L)*180(W)*72(H)mm / 11.61(L)*7.09(W)*2.83(H) Inch
Weight 2.7kg / 5.4 Lbs.
Note: The specifications are subject to change without notice

Specification Model No.
Item SK1000-
112 SK1000- 124 SK1000- 148 SK1000- 212 SK1000- 224 SK1000- 248
Continuous Output Power 1000W
Maximum Output Power
(3Min.) 1150W
Surge Rating 2000W
Input voltage 12V 24V 48V 12V 24V 48V
Output Voltage 100 / 110 / 120V +/- 3% 220 / 230 / 240V +/- 3%
Frequency
(Switch Selectable) 50 / 60Hz +/- 0.05%
Output Waveform Pure Sine Wave ( THD < 3% )
Efficiency (full load) 89.0% 92.0% 93.0% 91.0% 94.0% 95.0%
No Load Current Draw 1.43A 0.75A 0.38A 1.25A 0.65A 0.35A
Stand-By Current Draw 0.25A 0.15A 0.09A 0.25A 0.15A 0.09A
Input Voltage Regulation 10.5-15
VDC
21.0-30
VDC
42-60
VDC
10.5-15
VDC
21.0-30
VDC
42-60
VDC
Input Level Indicator Red / Orange / Green LED
Load Level Indicator
Failure Indicator Red LED
Protection Overload, Short Circuit, Reverse Polarity (Fuse),
Over / Under Input Voltage, Over Temperature.
Remote Control Unit CR-6 / CR-7 / CR-8 Optional
Safety UL458 EN60950-1
EMC FCC Class A
EN55022: 1997
EN55024: 1997
EN61000-3-2: 1998
EN61000-3-3: 1995
e-Mark
Operating Temperature Range 0 - 40 ℃
Storage Temperature Range -30℃to 70℃
Cooling Loading controlled cooling fan
Dimensions 383(L)*182(W)*88(H)mm / 15.08(L)*7.17(W)*3.46(H) Inch
Weight 4 kg / 8.8 Lbs.
Note: The specifications are subject to change without notice.
Specification Model No.

Item SK1500-
112 SK1500- 124 SK1500- 148 SK1500- 212 SK1500- 224 SK1500- 248
Continuous Output Power 1500W
Maximum Output Power
(3Min.) 1725W
Surge Rating 3000W
Input voltage 12V 24V 48V 12V 24V 48V
Output Voltage 100 / 110 / 120V +/- 3% 220 / 230 / 240V +/- 3%
Frequency
(Switch Selectable) 50 / 60Hz +/- 0.05%
Output Waveform Pure Sine Wave ( THD < 3% )
Efficiency (full load) 88.0% 91.0% 92.0% 90.0% 93.0% 94.0%
No Load Current Draw 1.45A 0.75A 0.40A 1.40A 0.70A 0.40A
Stand-By Current Draw 0.28A 0.15A 0.09A 0.28A 0.15A 0.09A
Input Voltage Regulation 10.5-15
VDC
21.0-30
VDC
42-60
VDC
10.5-15
VDC
21.0-30
VDC
42-60
VDC
Input Level Indicator Red / Orange / Green LED
Load Level Indicator
Failure Indicator Red LED
Protection Overload, Short Circuit, Reverse Polarity (Fuse),
Over / Under Input Voltage, Over Temperature.
Remote Control Unit CR-6 / CR-7 / CR-8 Optional
Safety UL458 EN60950-1
EMC FCC Class A
EN55022: 1997
EN55024: 1997
EN61000-3-2: 1998
EN61000-3-3: 1995
e-Mark
Operating Temperature Range 0 - 40 ℃
Storage Temperature Range -30℃to 70℃
Cooling Loading controlled cooling fan
Dimensions 415(L)*191(W)*88(H)mm / 16.34(L)*7.52(W)*3.46(H) Inch
Weight 4.8 kg / 10.56 Lbs.
Note: The specifications are subject to change without notice.

Specification Model No.
Item SK2000-
112 SK2000- 124 SK2000- 148 SK2000- 212 SK2000- 224 SK2000- 248
Continuous Output Power 2000W
Maximum Output Power
(3Min.) 2300W
Surge Rating 4000W
Input voltage 12V 24V 48V 12V 24V 48V
Output Voltage 100 / 110 / 120V +/- 3% 220 / 230 / 240V +/- 3%
Frequency
(Switch Selectable) 50 / 60Hz +/- 0.05%
Output Waveform Pure Sine Wave ( THD < 3% )
Efficiency (full load) 89.0% 92.0% 93.0% 91.0% 94.0% 95.0%
No Load Current Draw 2.8A 1.5A 0.7A 2.64A 1.32A 0.65A
Stand-By Current Draw 0.60A 0.30A 0.15A 0.60A 0.25A 0.15A
Input Voltage Regulation 10.5-15
VDC
21.0-30
VDC
42-60
VDC
10.5-15
VDC
21.0-30
VDC
42-60
VDC
Input Level Indicator Red / Orange / Green LED
Load Level Indicator
Failure Indicator Red LED
Protection Overload, Short Circuit, Reverse Polarity (Fuse),
Over / Under Input Voltage, Over Temperature.
Remote Control Unit CR-6 / CR-7 / CR-8 Optional
Safety UL458 EN60950-1
EMC FCC Class A
EN55022: 1997
EN55024: 1997
EN61000-3-2: 1998
EN61000-3-3: 1995
e-Mark
Operating Temperature Range 0 - 40 ℃
Storage Temperature Range -30℃to 70℃
Cooling Loading controlled cooling fan ( 65℃ON , 45℃OFF)
Dimensions 422(L)*208(W)*166(H)mm / 16.6(L)*8.18(W)*6.53(H) Inch
Weight 9 kg / 19.8 Lbs.
Note: The specifications are subject to change without notice.

Specification Model No.
Item SK3000-
112 SK3000- 124 SK3000- 148 SK3000- 212 SK3000- 224 SK3000- 248
Continuous Output Power 3000W
Maximum Output Power
(3Min.) 3450W
Surge Rating 6000W
Input voltage 12V 24V 48V 12V 24V 48V
Output Voltage 100 / 110 / 120V +/- 3% 220 / 230 / 240V +/- 3%
Frequency
(Switch Selectable) 50 / 60Hz +/- 0.05%
Output Waveform Pure Sine Wave ( THD < 3% )
Efficiency (full load) 88.0% 91.0% 92.0% 90.0% 93.0% 94.0%
No Load Current Draw 2.0A 1.6A 0.8A 2.8A 1.5A 0.7A
Stand-By Current Draw 0.55A 0.35A 0.19A 0.55A 0.35A 0.19A
Input Voltage Regulation 10.5-15
VDC
21.0-30
VDC
42-60
VDC
10.5-15
VDC
21.0-30
VDC
42-60
VDC
Input Level Indicator Red / Orange / Green LED
Load Level Indicator
Failure Indicator Red LED
Protection Overload, Short Circuit, Reverse Polarity (Fuse),
Over / Under Input Voltage, Over Temperature.
Remote Control Unit CR-6 / CR-7 / CR-8 Optional
Safety UL458 EN60950-1
EMC FCC Class A
EN55022: 1997
EN55024: 1997
EN61000-3-2: 1998
EN61000-3-3: 1995
e-Mark
Operating Temperature Range 0 - 40 ℃
Storage Temperature Range -30℃to 70℃
Cooling Loading controlled cooling fan
Dimensions 452(L)*208(W)*166(H)mm / 17.80(L)*8.18(W)*6.53(H) Inch
Weight 9.8 kg / 22 Lbs.
Note: The specifications are subject to change without notice.

2-3. Mechanical Drawings
8

3. Introduction
This power inverter series is a the member of the most advanced line of
mobile AC power systems available.
To get the most out of the power inverter, it must be installed and used
properly. Please read the instructions in this manual before installation and
operation this
model.
3-1. Front Panel Operations：
3-1-1. Front view：

3-1-2. ON / OFF/ REMOTE (Main) switch：
a. Before installing the inverter, make sure the main switch
must
be “OFF”.
b. Before using the remote unit, make sure the main switch
must be “ REMOTE”.
3-1-3. Input Level：Display Input Voltages
LED Status DC 12V DC 24V DC 48V
RED Blink (slow) 10.5~10.9 21.0~21.8 42.0~43.6
RED 10.9~11.3 21.8~22.6 43.6~45.2
ORANGE 11.3~12.0 22.6~24.0 45.2~48.0
GREEN 12.0~14.0 24.0~28.0 48.0~56.0
ORANGE Blink 14.0~14.7 28.0~29.4 56.0~58.8
OVER RED BLINK 14.7 29.4 58.8

3-1-4. Load Level：Display AC Loads (Watts)
LED status DARK GREEN ORANGE RED RED
BLINK
SK700 0 ~ 35W 35 ~
230W 230 ~ 525W 525 ~ 672W Over 672W
SK1000 0 ~ 50W 50 ~
330W 330 ~ 750W 750 ~ 960W Over 960W
SK1500 0 ~ 75W 75 ~
495W 495 ~ 1125W 1125 ~ 1450W Over 1450W
SK2000 0 ~ 100W 100 ~
660W 660 ~ 1500W 1500 ~ 1920W Over 1920W
SK3000 0 ~ 150W 150 ~
990W 990 ~ 2250W 2250 ~ 2880W Over 2880W
3-1-5. AC Frequency：Selected by “S4” Dip Switch
Frequency S4
50 HZ OFF
60 HZ ON

3-1-6. Status：Display Power & Fault Status
Green LED LED Signal Status
Solid Power OK
Blink (Slow) - - - - - - - Power Saving
Red LED LED Signal Status
Blink (Fast) - - - - - - - - - - - - OVP
Blink (Slow) - - - - - - - UVP
Blink
(Intermittently) . . . . . . . . OTP
Solid OLP
3-1-7. Power Saving Mode: Power Saving Mode is adjustable and
set by the Dip Switches, S1, S2 and S3 on front panel.
Example: With the watt setting at 15W, a 15W↑load will
bring the inverter to operate normally, a 15W↓load, the
Power saving mode presents.
SK700 SK1000
SK1500 SK2000 SK3000 S1 S2 S3
DISABLE DISABLE DISABLE OFF OFF OFF
15W 20W 40W ON OFF OFF
30W 40W 80W OFF ON OFF
40W 50W 100W ON ON OFF
56W 60W 120W OFF OFF ON
70W 80W 160W ON OFF ON
84W 90W 180W OFF ON ON
100W 110W 220W ON ON ON

3-1-8. AC outlets (available):

3-2. Rear Panel Operations：
3-2-1. Remote Port:
The SK Series Inverter can be compatible with any of remote
controllers, CR-6, CR-7 or CR-8.
Before using the remote unit, make sure the main switch must
be “ REMOTE”.
3-2-2. Fan Ventilation:
Do not obstruct, allow at least 1 inch for proper air flow.
1
4

3-2-3. DC Input Terminals：
Connect to 12V / 24V / 48V battery or the other power
sources.
【＋】is positive,【－】is negative. Reverse polarity
connection
will blow internal fuse and may damage inverter permanently.
DC Input Voltage
Model Minimum Maximum
12 V 10.5 15.0
24 V 21.0 30.0
48 V 42.0 60.0
3-2-4. Chassis Ground: using # 8 AWG wire to connect vehicle
chassis.

3-3. Protections Features:
DC Input (VDC) Over Temperature Protection
Over Voltage Under Voltage INTERIOR HEAT SINK
Model
Shut-
down Restart Under
Voltage
Alarm Shut-
down Restart Shut- down Restart Shut- down Restart
12V 15.3 14.2 11.0 10.5 12.5
24V 30.6 28.4 22.0 21.0 25.0
48V 61.2 56.8 44.0 42.0 50.0
70
deg C 45 deg C 90 deg C 60 deg C
WARNING!
Operation of the inverter without a
proper ground
connection may result in an
electrical safety hazard.
3-4. Installation：
Where to install. The power inverter should be installed in a location
that meets the following requirements：
3-4-1. Dry – Do not allow water to drip or splash on the inverter.
3-4-2. Cool – Ambient air temperature should be between 0℃and
40℃, the cooler the better.
3-4-3. Safe – Do not install in a battery compartment or other areas
where flammable fumes may exist, such as fuel storage areas
or engine compartments.
3-4-4. Ventilated – Allow at least one inch of clearance around the
inverter for air flow. Ensure the ventilation openings on the
rear and front of the unit are not obstructed.
3-4-5. Dust – Do not install the Inverter in a dusty environments
where are dust, wood particles or other filings/shavings are
present. Dust can be pulled into the unit when the cooling fan is
operating.