# SL-1000 Back Contact Cell Welder: 600 Cells/h

> SUNPOWER Back Contact Cell Welding Machine SL-1000 by Ooitech features electromagnetic welding, CCD+SCARA robot positioning, dual cell loading

![SL-1000 Back Contact Cell Welder: 600 Cells/h](https://cdn.ooitech.com/runtime/image/w800_h600_fitblur_v2_1774263750726273.webp)

#### SL-1000 Back Contact Cell Welder: 600 Cells/h

SUNPOWER Back Contact Cell Welding Machine SL-1000 by Ooitech features electromagnetic welding, CCD+SCARA robot positioning, dual cell loading

##### Stock: Available | 30~60 days manufacturing time

##### Category: Product

##### Tags:

---

---

**Quick answer:** The SL-1000 is a SUNPOWER back contact cell welding machine, built for the back-contact cell family that SUNPOWER popularised. It is a fully automatic stringer specified for cells with both polarity contacts on the rear face. Because there is no front busbar, the whole front surface of the cell stays available for light, and the stringing step has to reach the electrodes from behind. That means different tooling, a different ribbon route, and a soldering head that works in a narrower space than on a conventional front-contact line. The SL-1000 is the stringer counterpart to a back-contact cell line, and it is normally specified together with a back-contact laser cutting station and a matching layup system.

PV Module Manufacturing · by Jerry, Ooitech

## SUNPOWER Back Contact Cell Welding Machine SL-1000 Overview

![Watch product video](https://img.youtube.com/vi/MOyyhnECZJg/hqdefault.jpg)

The **SL-1000 SUNPOWER Back Contact Cell Welding Machine** is a fully automatic stringer engineered specifically for welding back contact (IBC/SUNPOWER) solar cell strings. Unlike conventional [tabber stringer](https://www.ooitech.com/SS-1500B-Automatic-Solar-Cell-Welding-Machine-High-Speed-Tabber-Stringer-for-BC-TOPCON-PERC-Cells.html)s designed for front-busbar cells, the SL-1000 addresses the unique interconnection challenge of back contact cells where both positive and negative electrodes are located on the rear surface. This machine integrates advanced electromagnetic welding, high-precision CCD vision inspection, and SCARA four-axis robotic positioning to deliver reliable, high-throughput back contact cell string production.

The complete system includes A/B dual cell loading boxes, a loading translational mechanical arm, a cell transmission table, a CCD + four-axis robot detection and positioning system, a welding transmission table, an electromagnetic welding module, welding ribbon material boxes, a welding ribbon transport mechanism, a welding ribbon positioning table, double welding ribbon gluing tables, a welding ribbon placement module, and a fully automatic unloading mechanism with conveyor belt, cell string sucker, clean paper sucker, cell string box, and clean paper box.

**Working Principle:**The loading translational mechanical arm picks solar cells from the dual cell boxes and places them onto the cell transfer station, while simultaneously collecting interleaving paper into the paper collection box. The transfer station conveys cells to the CCD detection and positioning station. The CCD camera captures coordinate information and sends it to the SCARA four-axis robot, which corrects cell orientation and places each cell precisely onto the welding transfer station. The welding transfer station features multiple independently controlled temperature zones for optimal thermal management during string welding.

Meanwhile, the welding ribbon transport mechanism picks pre-cut [solder ribbon](https://www.ooitech.com/Solar-Panel-Soldering-Ribbon-and-Flux-Essential-Components-for-PV-Module-Manufacturing.html)s from the ribbon material box and delivers them to the positioning table, then transfers them to the ribbon placement table. The ribbon laying mechanism and four-axis robot alternate operations to complete ribbon placement and cell stacking. The assembled ribbon-and-cell array travels from the welding transfer station to the electromagnetic welding station, where the electromagnetic welding module completes soldering. Finished cell strings are transported to the unloading station via conveyor belt, and the unloading mechanism loads strings into the cell string box with clean paper interleaving to prevent scratching.

## Technical Parameters

| Parameter | Specification |
| --- | --- |
| Model | SL-1000 |
| Capacity | >=600 PCS/H (when welding 1/3 cut cells) |
| Positioning Accuracy | +/-0.10 mm |
| Maximum Operating Speed | 1000 mm/s (adjustable) |
| Applicable Cell Sizes | 125x125 mm, 125x62.5 mm, 125x41.67 mm, 166x166 mm, 166x41.5 mm |
| Maximum String Length | 1600 mm |
| Welding Method | Electromagnetic welding |
| Number of Welding Heads | 2 |
| Cell Detection | CCD camera detection (missing corner, misplacement) |
| Placing Accuracy | +/-0.2 mm |
| Welding Tape Materials | Solder ribbon pad tinned or solder paste |
| Number of Cell Boxes | 2 (250 pieces/box) |
| Number of Ribbon Boxes | 2 (200 pieces/box) |
| Cell Fragmentation Rate | <=0.2% (Class A cells) |
| Equipment Failure Rate | <=3% |
| Cell Positioning Method | CCD camera + SCARA robot |
| Ribbon Positioning Method | Mechanical positioning |
| Loading/Unloading | Fully automatic |
| Electrical System | PLC + touchscreen + servo + module |
| HMI | Touchscreen, user-friendly interface |
| Error Alarm | Real-time fault alarm |
| Equipment Dimensions (LxWxH) | 5390 x 2200 x 1800 mm |
| Equipment Weight | 1650 kg |
| Power Supply | Three-phase five-wire, 380V/50Hz, 5 kW |
| Compressed Air Pressure | 6-8 Bar |
| Compressed Air Flow Rate | >=400 L/min |
| Air Dust Particles | <=0.5 um |
| Air Pipe Diameter | 12 mm |
| Operating Temperature | 20-25 degrees C |
| Relative Humidity | Less than 85% (non-condensation) |
| Air Cleanliness | Not less than 300,000 levels (ISO Class 8) |
| Device Color | Main traffic white + sky blue |

### Key Components and Suppliers

| Component | Brand / Origin | Specification | Function |
| --- | --- | --- | --- |
| Steel Frame | China | Q235 | Machine frame |
| PLC | INOVANCE / China | QT550 | Whole machine control system |
| Proximity Switch | OMRON | Series products | Robot arm positioning control |
| Pneumatic Components | AirTAC / SMC | Series products | Pneumatic actuation |
| Air Switch | Chint | Series products | Electrical protection |
| AC Contactor | Schneider | Series products | Electrical control |
| Control Card | China | Series products | Motion control |
| Servo Motor | Delta | Series products | X/Y module drive |
| Touchscreen | Kunlun Tongtai | 10 inch | HMI control interface |
| Guide Rail and Screw Rod | WON | 1620 | X/Y module linear motion |
| Four-Axis Robot | China | 600SR | Cell grabbing and positioning |
| Camera | Hikvision / China | 800W pixel industrial camera | CCD detection and positioning |
| Electromagnetic Welding Head | China | Custom made | Cell and ribbon welding |

## Technical Advantages

### Electromagnetic Welding Technology

- Non-contact electromagnetic heating provides uniform heat distribution across all solder joints, minimizing thermal stress on delicate back contact cells
- Welding power is fully adjustable to accommodate different ribbon thicknesses and solder paste types
- Dual welding heads increase throughput while maintaining consistent weld quality
- Air cooling and compressed air assisted cooling ensure rapid cycle times and prevent cell overheating

### High-Precision CCD + SCARA Robot Positioning

- 800W pixel industrial camera accurately detects cell position, missing corners, and incorrect placement before welding
- SCARA four-axis robot individually corrects up to 4 cells at a time with +/-0.10 mm positioning accuracy
- Closed-loop feedback between CCD vision and robot ensures every cell is placed within +/-0.2 mm tolerance
- Significantly reduces cell breakage rate to 0.2% or less with Class A cells

### Flexible Multi-Size Cell Compatibility

- Supports five cell specifications: 125x125 mm, 125x62.5 mm, 125x41.67 mm, 166x166 mm, and 166x41.5 mm
- Adjustable material box accommodates different cell dimensions with simple mechanical adjustment
- Tooling fixture changeover for 166 mm series cells is straightforward and quick
- Maximum string length of 1600 mm covers a wide range of back contact module designs

### Fully Automatic Material Handling

- A/B dual cell loading boxes with up to 4 small boxes per station allow continuous production with minimal downtime
- Automatic paper picking and interleaving prevents cell and string surface damage
- Servo-driven loading mechanical arm with high vacuum traceless suction cups ensures gentle, reliable cell handling
- Fully automatic unloading with clean paper insertion protects finished cell strings from scratching

### Intelligent Temperature and Process Control

- Multiple independently controlled temperature zones on the welding transfer station enable optimized thermal profiles
- Real-time temperature monitoring with PID control and adjustment maintains stable welding conditions
- Zoned vacuum adsorption system secures cells and ribbons during transport and welding
- Teflon belt conveyor prevents ribbon adhesion and ensures smooth material flow

### User-Friendly Software and Operation

- Dedicated software with friendly HMI touchscreen interface for easy parameter editing and process modification
- Centralized numerical control allows all key parameters to be set and saved through the software interface
- Hierarchical password protection separates operation mode and setting mode for safety
- Real-time fault alarm system enables quick diagnosis and minimal production interruption

## Applications

### Back Contact (IBC / SUNPOWER) Solar Module Production

The SL-1000 is purpose-built for manufacturing solar modules using SUNPOWER-type back contact cells. It is the core stringing equipment in any IBC or back contact solar panel production line, handling the critical step of interconnecting cells where all busbars are on the rear surface.

### 1/3 Cut and Full-Size Back Contact Cell Stringing

With support for both full-size (125x125 mm, 166x166 mm) and cut cells (125x62.5 mm, 125x41.67 mm, 166x41.5 mm), the SL-1000 serves production lines making standard back contact modules as well as advanced shingled or high-density back contact module designs.

### High-Efficiency Premium Solar Panel Manufacturing

Back contact cells deliver higher efficiency and superior aesthetics due to the absence of front-side busbars. The SL-1000 enables manufacturers to produce premium, all-black solar panels targeting residential rooftop, commercial, and BIPV (Building Integrated Photovoltaic) markets.

### Pilot Lines and R&D Facilities

With its adjustable welding parameters, flexible cell size compatibility, and detailed process monitoring, the SL-1000 is also well suited for research institutions and pilot production lines developing next-generation back contact cell technologies.

### Solar Module Production Line Integration

The SL-1000 integrates seamlessly with upstream and downstream equipment in a complete solar panel production line, including cell [laser cutting](https://www.ooitech.com/SC-20P-Automatic-Solar-Cell-Laser-Cutting-Machine-High-Precision-BC-Cell-Processing-Equipment.html) machines, [layup machine](https://www.ooitech.com/automatic-solar-cell-layup-machine-ws-cl80d-high-speed-mbb-half-cell-string-laying-equipment-for-solar-panel-production-line.html)s, laminators, [framing machine](https://www.ooitech.com/solar-panel-framing-machine-with-punching-function-and-otzk-a-full-automatic-framing-machine-with-auto-dispensing-glue-ooitech.html)s, EL testers, IV testers, and sun simulators supplied by Ooitech.

## Site Preparation Requirements

### Facility Requirements

- Flat ground surface, low-dust environment, away from vibration sources and strong electromagnetic interference
- Equipment footprint: 5390 x 2200 x 1800 mm (L x W x H)
- Equipment weight: 1650 kg
- Transport tools required: forklift and hydraulic tow truck

### Environmental Conditions

- Ambient temperature: 20-25 degrees C
- Relative humidity: less than 85% (non-condensation)
- Air cleanliness: not less than 300,000 levels (ISO Class 8)

### Power Supply

- Single machine independent power supply, three-phase five-wire (380V/50Hz), capacity 5 kW
- Purified regulated power supply recommended if grid voltage is unstable
- Earth protection terminal connection required
- Leakage protection switch installation required

### Compressed Air Supply

- Freeze-dried compressed air, pressure 6-8 Bar, flow rate >=400 L/min
- Dust particles <=0.5 um
- High-pressure air source pipe diameter: 12 mm

### Materials to Prepare

- Acetone, alcohol, absorbent cotton, dust-free cloth
- Sample finished and semi-finished back contact battery cells
- Matching special welding ribbons
- Designated full-time equipment operators

## Warranty and After-Sales Service

- One year warranty after successful installation or 16 months from Bill of Lading date, whichever comes first
- During warranty period, Ooitech provides timely maintenance services and necessary spare parts free of charge (excluding consumables); spare parts courier cost is the responsibility of the buyer
- If buyer's engineers cannot resolve an issue during the warranty period, Ooitech will dispatch engineers to the buyer's facility; round-trip tickets, local transportation, hotel, and food costs in the buyer's city are paid by the buyer
- Warranty does not cover damage from misuse, abuse, unauthorized modification, or operation inconsistent with the operation manual
- After warranty period, Ooitech continues to provide free online technical support and guidance, with spare parts supplied at favorable prices; on-site service visits after warranty require buyer to cover travel, visa, accommodation, food, and labor costs per Ooitech standards
- Consumable parts are available for purchase at any time

## Contact Ooitech for Back Contact Cell Welding Machine

Ooitech, founded in 2013, is a professional turnkey solar energy solution provider with more than 10 years of experience in the PV industry. Our solar panel production line equipment has been exported to Poland, Hungary, Korea, Mexico, Egypt, Algeria, India, Saudi Arabia, Syria, Kazakhstan, and many other countries worldwide.

Our turnkey solutions include:

- 5MW to 1GW solar module production line design, delivery, and commissioning
- Upgrade traditional PV lines to the newest MBB, PERC, TOPCon, IBC, HJT, and back contact production lines
- Factory construction planning and facility layout design
- Raw material sourcing guidance
- Production procedure training and solar power station installation assistance

If you are looking for a reliable **SUNPOWER back contact cell welding machine** or a complete back contact solar panel production line, contact Ooitech today for professional consultation and a competitive quotation.

**Email:** [info@ooitech.com](mailto:info@ooitech.com)**Phone:** +8618571646990**WhatsApp:** +8615961592660**Head Office:** Wuhan Yangtze River Center, Wuhan, China**Website:** [www.ooitech.com](https://www.ooitech.com)**YouTube Channel:** [www.youtube.com/ooitech](https://www.youtube.com/ooitech)**MBB Full Automatic Solar Panel Production Line Video:** [Watch on YouTube](https://www.youtube.com/watch?v=uRS9sn94sIQ)**Download Ooitech Catalogue:** [Click Here](https://drive.google.com/file/d/1EWA3TV6hJb_cAUH6w0UENpRglAgq_Kzv/view?usp=sharing)**Download Ooitech Company Profile:** [Click Here](https://drive.google.com/file/d/1yg9NLXzLOmPWriYScQZeM6ZfSZ8gcQ88/view?usp=sharing)

Subscribe to the Ooitech YouTube channel and stay updated with the latest solar panel manufacturing technology, equipment demonstrations, and factory setup guides.

## Related Items

![CHT9951A Hipot Insulation Tester: 0.1-10kV DC](https://cdn.ooitech.com/static/upload/image/20260327/1774601338282260.webp)

#### CHT9951A Hipot Insulation Tester: 0.1-10kV DC

![Solar Cell Laser Cutting Machine — OLS-20E Dual Laser](https://cdn.ooitech.com/static/upload/image/20260318/2026031858869524.webp)

#### Solar Cell Laser Cutting Machine — OLS-20E Dual Laser

![Wire Drawing Machine for Solar Ribbon Production Line](https://cdn.ooitech.com/static/upload/image/20260511/2026051187922761.webp)

#### Wire Drawing Machine for Solar Ribbon Production Line

![Portable EL Tester: 24MP, Detects 0.2mm Cracks](https://cdn.ooitech.com/static/upload/image/20260512/2026051214015103.webp)

#### Portable EL Tester: 24MP, Detects 0.2mm Cracks

![ST-TLD3A+ IV Tester – PV Module Flash & Performance](https://cdn.ooitech.com/static/upload/image/20260326/1774514799764615.webp)

#### ST-TLD3A+ IV Tester – PV Module Flash & Performance

![C350-CQC EVA & TPT Strip Cutting Machine: 30-80mm](https://cdn.ooitech.com/static/upload/image/20260327/2026032714363679.webp)

#### C350-CQC EVA & TPT Strip Cutting Machine: 30-80mm

![SC-10C Full Automatic Silicon Wafer Laser Cutting](https://cdn.ooitech.com/static/upload/image/20260324/1774340166130021.webp)

#### SC-10C Full Automatic Silicon Wafer Laser Cutting

![PV Ribbon Machine — Wire Drawing and Tinning Line](https://cdn.ooitech.com/static/upload/image/20260511/2026051111285937.webp)

#### PV Ribbon Machine — Wire Drawing and Tinning Line

![](/template/ooitech/assets/img/shape/06.png)

![](https://cdn.ooitech.com/runtime/image/w800_h700_fitblur_v2_w800_h700_fitblur_v2_1757399770541443.webp)

### Request A Quote

All uploads are secure and confidential.

## We deliver expertise you can trust our service

Direct-from-Factory Equipment.

![](/template/ooitech/assets/img/icon/money-2.svg)

### Cost-Effective Advantages

We deliver exceptional value, maximizing results while optimizing budgets for clients.

![](/template/ooitech/assets/img/icon/staff.svg)

### Our Experience Team

Our skilled professionals specialize in innovative solutions and tailored strategies.

![](/template/ooitech/assets/img/icon/certified.svg)

### 15+ Years Industry Experience

Deep expertise ensures reliable, trend-aware, and proven outcomes for success.

![](https://cdn.ooitech.com/static/upload/image/20250910/1757477357667605.webp)

![](https://cdn.ooitech.com/static/upload/image/20250910/1757477724911512.webp)

![](/template/ooitech/assets/img/shape/06.png)

## What Our Client Say's about us

Client testimonials praise our deep understanding of their challenges, which leads to innovative solutions and strong ROI. Long-term collaborations—some over a decade—demonstrate their trust and satisfaction. Their success stories drive us to continually exceed expectations. [Know More **](#quote-form)

![](/template/ooitech/assets/img/icon/quote.svg)

Thanks to Ooitech for providing the fully automated production equipment—your installation and after-sales service have been excellent.

![Amjad](https://cdn.ooitech.com/runtime/image/w160_h160_fitblur_v2_2026041720921238.webp)

### Amjad

![](/template/ooitech/assets/img/icon/quote.svg)

thank you for ooitech's professional support and on time after service.

![Diarra From Africa](https://cdn.ooitech.com/runtime/image/w160_h160_fitblur_v2_1784509010217979.webp)

### Diarra From Africa

![](/template/ooitech/assets/img/icon/quote.svg)

Thanks to Ooitech for providing highly suitable BC solar cell experimental equipment.

![KTECH](https://cdn.ooitech.com/runtime/image/w160_h160_fitblur_v2_1776426122864564.webp)

### KTECH

![](/template/ooitech/assets/img/icon/quote.svg)

A man with a big soul. Thank you very much for your visit Mr Wu. Thank you very much for the services provided in installing equipment and training my students. The kindest person and professional in his field

![Jizzakh Polytechnic Institute](https://cdn.ooitech.com/runtime/image/w160_h160_fitblur_v2_2026041716444445.webp)

### Jizzakh Polytechnic Institute

![](/template/ooitech/assets/img/icon/quote.svg)

Thank you again so much again for the very big big help for improving and fixing the factory and also teaching the workers how to use the machines

![Mark](https://cdn.ooitech.com/runtime/image/w160_h160_fitblur_v2_1757479675272137.webp)

### Mark

BIPV Philippines

## Our Latest News & Blog

![TOPCon Solar Cell Manufacturing Process: Step-by-Step](https://cdn.ooitech.com/runtime/image/w320_h200_fitblur_v2_3fffaa885dcfbafc7d41439c979f3e14.webp)

- [** ooitech](./topcon-solar-cell-manufacturing-process-a-complete-step-by-step-guide.html)
- [** 3053](./topcon-solar-cell-manufacturing-process-a-complete-step-by-step-guide.html)

### TOPCon Solar Cell Manufacturing Process: Step-by-Step

TOPCon stands for Tunnel Oxide Passivated Contact. This guide covers the full TOPCon solar cell manufacturing process step by step: texturing, boron diffusion, tunnel oxide and polysilicon deposition, metallisation and testing.

![Cosmic Solar Purchases 5MW Semi-Automatic Solar Panel](https://cdn.ooitech.com/runtime/image/w320_h200_fitblur_v2_2026041511844574.webp)

- [** ooitech](./cosmic-solar-purchases-5mw-semi-automatic-solar-panel-production-line-from-ooitech-in-2014.html)
- [** 1874](./cosmic-solar-purchases-5mw-semi-automatic-solar-panel-production-line-from-ooitech-in-2014.html)

### Cosmic Solar Purchases 5MW Semi-Automatic Solar Panel

In 2014, Indian company Cosmic Solar purchased a 5MW semi-automatic solar panel production line from Ooitech, marking an important milestone in Ooitech

![30MW BIPV Solar Panel Production Line](https://cdn.ooitech.com/runtime/image/w320_h200_fitblur_v2_2026041451376657.webp)

- [** ooitech](./30mw-bipv-solar-panel-production-line-in-philippines-powered-by-ooitech.html)
- [** 1834](./30mw-bipv-solar-panel-production-line-in-philippines-powered-by-ooitech.html)

### 30MW BIPV Solar Panel Production Line

Ooitech delivers a complete 30MW BIPV solar panel production line to the Philippines, enabling local manufacturing of building-integrated photovoltaic

![Tabber Stringer Machine Manufacturer: How to Vet One](https://cdn.ooitech.com/runtime/image/w320_h200_fitblur_v2_2026061020186378.webp)

- [** ooitech](./how-a-tabber-and-stringer-works-and-how-to-choose-one-in-2026.html)
- [** 1708](./how-a-tabber-and-stringer-works-and-how-to-choose-one-in-2026.html)

### Tabber Stringer Machine Manufacturer: How to Vet One

How to tell a real tabber stringer machine manufacturer from a trading company, what an acceptance test must prove, and quotation red flags.

![Solar Panel Production Line in Egypt: 4 Projects](https://cdn.ooitech.com/runtime/image/w320_h200_fitblur_v2_2026041439202098.webp)

- [** ooitech](./egypt-first-full-automatic-solar-panel-production-line-from-china-ooitech-success-story.html)
- [** 1645](./egypt-first-full-automatic-solar-panel-production-line-from-china-ooitech-success-story.html)

### Solar Panel Production Line in Egypt: 4 Projects

Ooitech has delivered four solar panel production lines in Egypt since 2014. What Egyptian buyers ask, and how much space each capacity needs.

![Triple-Junction GaAs Solar Cell — Structure and Gains](https://cdn.ooitech.com/runtime/image/w320_h200_fitblur_v2_ooitech-triple-junction-gaas-structure-cover.webp)

- [** ooitech](./triple-junction-gaas-solar-cells-a-detailed-look-at-the-mainstream-space-photovoltaic-structure.html)
- [** 1575](./triple-junction-gaas-solar-cells-a-detailed-look-at-the-mainstream-space-photovoltaic-structure.html)

### Triple-Junction GaAs Solar Cell — Structure and Gains

Triple-junction GaAs solar cell: how three stacked junctions split the spectrum, why efficiency passes 30%, and where cost limits concentrator use.

![American Green Energy Company Purchases Ooitech](https://cdn.ooitech.com/runtime/image/w320_h200_fitblur_v2_2026032780265832.webp)

- [** ooitech](./american-green-energy-company-purchases-ooitech-automatic-ribbon-cutting-machine-in-2014.html)
- [** 1516](./american-green-energy-company-purchases-ooitech-automatic-ribbon-cutting-machine-in-2014.html)

### American Green Energy Company Purchases Ooitech

In 2014, a green energy company from the United States purchased the Ooitech automatic ribbon cutting and bending machine for their solar panel production

![SUNUSA Orders 5MW Semi-Automatic Solar Panel Production](https://cdn.ooitech.com/runtime/image/w320_h200_fitblur_v2_2026041512063502.webp)

- [** ooitech](./sunusa-orders-5mw-semi-automatic-solar-panel-production-line-from-ooitech-in-2014.html)
- [** 1379](./sunusa-orders-5mw-semi-automatic-solar-panel-production-line-from-ooitech-in-2014.html)

### SUNUSA Orders 5MW Semi-Automatic Solar Panel Production

In 2014, Indian solar manufacturer SUNUSA purchased a 5MW semi-automatic solar panel production line from Ooitech to expand domestic solar module