COTEK SD Series Pure Sine Wave Inverter

COTEK SD Series Pure Sine Wave Inverter

The COTEK SD series (SD1500/2500/3500) pure sine wave inverter is a multifunctional power conversion device that supports N+1 parallel redundancy and three-phase output. The input voltage covers 12/24/48VDC, and the output is 100-240VAC pure sine wave (THD<3%), with a rated power of 1500-3500VA. It has ATS automatic switching (optional STS module, switching time<4ms), multiple protections (overvoltage/undervoltage/short circuit/overload, etc.), remote control (RS-232/CAN bus), and energy-saving mode. It is suitable for scenarios such as RVs, ships, emergency equipment, industrial machinery, etc. The installation must follow strict safety regulations and support multiple parallel expansion power or forming a three-phase system.

Product basic parameters

Specification item SD1500 SD2500 SD3500 Remarks

Rated power: 1500VA, 2500VA, 3500VA, capacity reduction after 40 ℃ (refer to the capacity reduction curve)

Peak power (0.2 seconds)>2400VA>4000VA>6000VA-

Input voltage 12/24/48VDC 12/24/48VDC 12/24/48VDC Voltage range 10.0-16.0/20.0-32.0/40.0-64.0VDC

Output voltage 100-120/200-240VAC ± 3% 100-120/200-240VAC ± 3% 100-120/200-240VAC ± 3% DIP switch optional

Output frequency 50/60Hz ± 0.1% 50/60Hz ± 0.1% 50/60Hz ± 0.1% DIP switch switching

Total Harmonic Distortion (THD)<3% (linear load)<3% (linear load)<3% (linear load) When the input voltage is greater than 1.15 times the rated value

Maximum efficiency 88% -90% 88% -90% 90% -91% varies with model and input voltage

Working temperature -20~60 ℃ -20~60 ℃ -20~60 ℃ Storage temperature -40~70 ℃

Dimensions (W × H × D) 283 × 128 × 351mm 283 × 128 × 436mm 283 × 128 × 496mm Weight 5.5/8/10kg

Detailed explanation of core functions

Parallel expansion function

Supports up to 5 inverters in parallel, achieving N+1 redundancy or power expansion

Supported topologies: 1 Φ 2W (maximum 16 units), 1 Φ 3W (maximum 2 units), 3 Φ 4W (maximum 3 units)

Automatic master-slave mechanism: Only one master device needs to be configured, and the slave devices automatically synchronize parameters

Parallel communication: via CAN1/CAN2 ports (RJ-45 cable connection), a green terminal parallel jumper needs to be set up

Switching and control functions

Automatic Switching (ATS): Switching time between inverter and mains power is 8-10ms (inverter → mains power), 16-50ms (mains power → inverter)

Quick switching (STS, optional): Single unit<4ms, N+1/three-phase system<6ms

Control mode: local switch (ON/OFF/EMOTE), DIP switch (voltage/frequency/energy-saving mode), remote control (CR-6/8/10 panel)

Energy saving mode: triggered when the load is below 4% -8% of the rated power for 10 seconds, and restored when the load exceeds the threshold by 2-3 times

Communication and Monitoring

RS-232 interface: supports power on/off, parameter query (voltage/current/frequency), function configuration (OVP/UVP/language, etc.)

CAN bus: only used for communication between master and slave devices in parallel mode

LED indication: green (power supply normal/energy-saving/bypass), orange (overvoltage/undervoltage alarm), red (over temperature/overload/fault)

Fault record: supports short circuit, overload, overheating and other fault prompts and self recovery

Installation and wiring specifications

Installation requirements

Environmental conditions: dry, ventilated (with a reserved space of ≥ 1 foot around), dust-free, away from batteries (avoiding corrosive gases)

Safe distance: The distance between the exhaust outlet of the cooling fan and obstacles should be ≥ 1 foot to avoid covering the ventilation opening

Grounding requirement: Use 8AWG cable to connect the equipment casing to the vehicle/hull chassis

Wiring parameters | Model | Input voltage | Recommended wire diameter (AWG) | Series fuse specification | Maximum cable length|

|SD1500-112/212 | 12VDC | 0 | 250A | 1.8 meters|

|SD1500-124/224 | 24VDC | 1 | 125A | 1.8 meters|

|SD1500-148/248 | 48VDC | 4 | 90A | 1.8 meters|

|SD2500-112/212 | 12VDC | 3/0 | 350A | 1.8 meters|

|SD2500-124/224 | 24VDC | 1 | 175A | 1.8 meters|

|SD3500-112/212 | 12VDC | 4/0 | 500A | 1.8 meters|

|SD3500-124/224 | 24VDC | 0 | 250A | 1.8 meters|

Parallel wiring steps

Step 1: Set the main switches of all devices to OFF, and set the green terminal parallel jumper (the first and last devices are ON, and the middle is OFF)

Step 2: Unify the output voltage and frequency parameters of all devices through DIP switches

Step 3: Connect the CAN1/CAN2 ports with an RJ-45 cable, connect the positive and negative terminals of the DC end correspondingly, and connect the phase/neutral wires of the AC end correspondingly

Step 4: Set the DIP switches (S4-S7) for the master and slave devices, and automatically synchronize their operation after startup

Protection mechanism and security standards

Core protection function | Protection type | Trigger condition (12VDC as an example) | Action mode|

|Under Voltage Protection (UVP) | Input ≤ 10.0VDC | Shutdown, voltage restored to 12.5VDC, automatic restart|

|Overvoltage protection (OVP) | Input ≥ 16.0VDC | Shutdown, voltage drops to 15.0VDC and automatically restarts|

|Overload protection (OLP) | Output power>110% rated value | Shutdown, manual reset required|

|Over temperature protection (OTP) | Device temperature ≥ 60 ℃ | Shutdown, automatic restart after temperature drops|

|Short circuit protection | Output terminal short circuit | Stop immediately, reset after troubleshooting|

|Reverse polarity protection | Positive and negative polarity reversed | Internal fuse blown, fuse needs to be replaced|

Safety operation standards

Battery operation: Avoid contact with acid, prohibit smoking/open flames, remove metal jewelry

Electrical safety: Wait for 5 minutes after power failure to discharge, ensure reliable grounding, and use qualified copper cables

Mechanical safety: protection of rotating parts, zero load verification of motor direction, avoidance of covering ventilation openings

Certification standards: Complies with UL 458, EN 62368-1 safety standards, FCC Class B, EN 55032 EMC standards

Application scenarios

Mobile power bank: RV, yacht, camping equipment (compatible with 12/24VDC battery)

Emergency power supply: Home and office emergency equipment (computers, printers, lighting)

Industrial scenarios: metal halide lamps, high-pressure sodium lamps, small industrial machinery

Special scenarios: Off grid solar energy systems, ship equipment, remote area power supply