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    "url": "https://www.ooitech.com/ooitech-bc-cell-compatibility-test-six-makers-one-tabber-stringer.html",
    "language": "en",
    "title": "BC Cell Compatibility: Six Makers, One Tabber Stringer",
    "description": "Ooitech welded BC cells from LONGi, AIKO, JinkoSolar, Huanghe Hydropower, GCL and TCL on one tabber stringer. What the test covered, and where it stops.",
    "keywords": "bc cell compatibility test, back contact cell welding, bc cell tabber stringer, solar cell welding compatibility, hjt topcon bc stringer, pv ribbon soldering test, ooitech bc cell welding",
    "ogType": "website",
    "image": "https://cdn.ooitech.com/static/upload/image/20261022/2026102201010101.webp",
    "headings": [
        {
            "level": 1,
            "text": "BC Cell Compatibility: Six Makers, One Tabber Stringer"
        },
        {
            "level": 2,
            "text": "BC Cell Compatibility: Six Makers, One Tabber Stringer"
        },
        {
            "level": 2,
            "text": "What \"compatible\" had to mean before we started"
        },
        {
            "level": 2,
            "text": "The cell types that went through the machine"
        },
        {
            "level": 2,
            "text": "Why back-contact cells are harder to weld than the cells they replace"
        },
        {
            "level": 3,
            "text": "The alignment window closes"
        },
        {
            "level": 3,
            "text": "The cell is thinner and less forgiving"
        },
        {
            "level": 3,
            "text": "Warpage appears after the joint, not during it"
        },
        {
            "level": 2,
            "text": "Three chemistries, three temperature windows, one platform"
        },
        {
            "level": 2,
            "text": "How the programme was run"
        },
        {
            "level": 2,
            "text": "What the results showed"
        },
        {
            "level": 2,
            "text": "Where these claims stop"
        },
        {
            "level": 2,
            "text": "What it changes for a line choosing back-contact today"
        },
        {
            "level": 2,
            "text": "The four things to ask any supplier making this claim"
        },
        {
            "level": 2,
            "text": "Frequently asked questions"
        },
        {
            "level": 3,
            "text": "Does this mean the machine welds any cell on the market?"
        },
        {
            "level": 3,
            "text": "Is Ooitech claiming these cell makers endorse the equipment?"
        },
        {
            "level": 3,
            "text": "Can one machine really run HJT and back contact?"
        },
        {
            "level": 3,
            "text": "What throughput should you expect on back-contact cells?"
        },
        {
            "level": 3,
            "text": "Does flat ribbon matter that much on the rear?"
        },
        {
            "level": 3,
            "text": "What happens when a new cell generation arrives?"
        },
        {
            "level": 2,
            "text": "Final thoughts"
        },
        {
            "level": 5,
            "text": "Tags :"
        },
        {
            "level": 5,
            "text": "Table of Contents"
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        {
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            "text": "Category"
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        {
            "level": 5,
            "text": "Recent Post"
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            "text": "0BB on Back-Contact Solar Cells: Gains and Yield Limits"
        },
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            "level": 6,
            "text": "What a PV Ribbon Does: Three Jobs, One Trade-off"
        },
        {
            "level": 5,
            "text": "Popular Tags"
        },
        {
            "level": 3,
            "text": "Request A Quote"
        },
        {
            "level": 2,
            "text": "We deliver expertise you can trust our service"
        },
        {
            "level": 3,
            "text": "Cost-Effective Advantages"
        },
        {
            "level": 3,
            "text": "Our Experience Team"
        },
        {
            "level": 3,
            "text": "15+ Years Industry Experience"
        },
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    "wordCount": 3389,
    "markdown": "# BC Cell Compatibility: Six Makers, One Tabber Stringer\n\n> Ooitech welded BC cells from LONGi, AIKO, JinkoSolar, Huanghe Hydropower, GCL and TCL on one tabber stringer. What the test covered, and where it stops.\n\n![BC Cell Compatibility: Six Makers, One Tabber Stringer](https://cdn.ooitech.com/static/upload/image/20261022/2026102201010101.webp)\n\n- ** Ooitech Editorial Team\n- ** 2026-10-22\n- ** 126 Views\n- ** [News](./News.html)\n\n## BC Cell Compatibility: Six Makers, One Tabber Stringer\n\n**Quick answer:** Ooitech has completed a compatibility programme that welded back-contact cells from LONGi, AIKO (ABC), JinkoSolar, Huanghe Hydropower, GCL and TCL on the same tabber stringer, using one machine and one recipe library. TOPCon and HJT cells were run on the same platform. The programme covered alignment, wetting, joint strength, electroluminescence and post-stringing warpage. It is our own test work and the feedback of the cell makers' overseas project teams, not a certification.\n\n## What \"compatible\" had to mean before we started\n\nA tabber that runs one cell type well is not difficult to build. A tabber that runs every cell type now in mass production, on the same frame, without a mechanical change between products, is a different problem. That was the target: not a demonstration weld, but a production recipe for each cell family that a customer could qualify and run.\n\nWe defined compatible as four conditions. The machine must place ribbon within the pad or finger window the cell itself defines. The joint must wet and form an intermetallic layer across the full contact area. The cell must survive the thermal cycle without cracking, and the string must come out flat enough to laminate. A cell that welds but warps, or welds but cracks at layup, fails the definition even though the joint looks correct under a microscope.\n\n## The cell types that went through the machine\n\nThe programme covered the back-contact products that are actually shipping in volume, plus the mainstream front-contact families, so that a line switching between them does not need a second platform. Back-contact cells came from six makers; the front-contact cells came from the same program runs.\n\n| Cell family | Sources in the programme | What the joint has to clear |\n| --- | --- | --- |\n| BC — back contact, no front busbar | LONGi, AIKO (ABC), JinkoSolar, Huanghe Hydropower, GCL, TCL | Narrow rear pads, tight alignment, flat ribbon, warpage |\n| TOPCon — front contacted | Same programme, mainstream supply | Fine fingers, multi-busbar pads, thin cells |\n| HJT — heterojunction | Same programme, mainstream supply | A temperature ceiling the paste and the amorphous layer set |\n| PERC | Reference runs | The baseline against which the others are judged |\n\nCell sizes ran from 166 mm to 210 mm, including the half-cell formats each maker ships, and busbar counts from three to twenty, including busbarless layouts. Ribbon placement used flat ribbon on the back-contact cells rather than round wire, because the rear pad is a flat surface with a defined width and a round wire only touches it along a line.\n\n## Why back-contact cells are harder to weld than the cells they replace\n\nOn a front-contact cell the ribbon lands on wide busbar pads and the joint is visible. On a back-contact cell both polarities sit on the rear, interdigitated, and the solderable area per finger is a fraction of what a busbar gives you. Three things follow, and all three are mechanical rather than metallurgical.\n\nFront contact leaves the joint on visible busbars; back contact moves it to narrow pads on the rear, where a strip sits next to the opposite polarity.\n\n### The alignment window closes\n\nA misplaced ribbon on a busbar cell still overlaps metal. On a back-contact cell the same offset can put the strip between two fingers of opposite polarity, which is not a weak joint but a short. Placement tolerance therefore has to be quoted in tens of microns and held over a full shift, which is why [the platform uses CCD alignment](https://www.ooitech.com/tabber-and-stringer-machine-how-it-works-how-to-choose.html) rather than mechanical stops alone.\n\n### The cell is thinner and less forgiving\n\nBack-contact cells in volume production sit in the 130 to 170 micron range, and the rear surface carries the whole interconnect pattern. Every kilogram of hold-down force that a front-contact machine can get away with is a crack risk here. Pressure has to be enough to guarantee contact and no more, which puts the burden on flatness of the platen and on how the strip is tensioned.\n\n### Warpage appears after the joint, not during it\n\nThe solder solidifies at a temperature far above the cell's own expansion range, and copper contracts about six times faster than silicon on the way down. That mismatch is absorbed by [the ribbon yielding in compression](https://www.ooitech.com/what-a-pv-ribbon-does-three-jobs-one-trade-off.html), which is the intended mechanism — but on a back-contact cell the ribbon runs across a surface that also has to stay flat for lamination. A string that is visibly bowed is a lamination defect waiting to happen, and it is the failure mode that shows up last.\n\nThe temperature at which the joint forms is the largest single lever on all of this. Lower solidification temperature means less strain locked into the cell. It also means less margin for the intermetallic layer to form, so the window is not \"as cold as possible\" but \"as cold as the joint allows\".\n\n## Three chemistries, three temperature windows, one platform\n\nThe reason a single machine can cover the market is that the differences between cell families are almost entirely thermal and mechanical, and both are programmable. What changes between products is the profile, the dwell, the hold-down pressure, the ribbon specification and the alignment model — not the hardware.\n\nThe cell family sets the ceiling and the solder alloy sets the floor. The usable window is the gap between them.\n\n| What changes | BC / TOPCon | HJT |\n| --- | --- | --- |\n| Peak cell temperature | Conventional reflow range, set by the paste | Capped by the amorphous silicon stack; the process is normally held at or below 200 °C |\n| Solder alloy | Standard tin-lead or lead-free coating | Low-temperature alloy, or conductive adhesive instead of solder |\n| Dwell and cooling | Short and controlled; cooling rate matters for warpage | Longer dwell at lower peak, gentler ramp to avoid thermal shock |\n| Handling force | Low, platen flatness critical | Lowest of the three; the stack is the most fragile part of the cell |\n\nA recipe switch between two cell families on this platform is a library change: the profile, pressures and alignment model load together, and the first string is inspected before the line releases. That is the practical difference between \"the machine can do it\" and \"you can run it on Tuesday afternoon when the cell supply changes\".\n\n## How the programme was run\n\nEach cell type went through the same six checks, in the same order, so that the results could be compared across makers rather than argued about.\n\nThe same six checks on every cell source, in the same order, so the results could be compared instead of argued about.\n\n- **Incoming EL.** Every batch was imaged before welding and any cell with a pre-existing crack was pulled out, so that breakage numbers could not be inflated by supplier defects.\n- **Placement.** Ribbon position was measured against the pad edge, not the cell edge, on the first, middle and last string of each run.\n- **Wetting and joint geometry.** Cross-sections were polished to check that the intermetallic layer was continuous and inside the working thickness range, rather than thick and brittle or thin and incomplete.\n- **Peel strength.** Ribbon was peeled at a fixed angle and rate on a tensile frame; the failure location was recorded as well as the force, because a joint that fails in the cell is a different problem from one that fails at the interface.\n- **Post-weld EL.** Cracks, finger interruptions and shunts introduced by the process, imaged at the same settings as the incoming inspection.\n- **Warpage and thermal cycling.** String flatness measured after cooling, then the assemblies went through thermal cycling before being re-imaged and re-peeled.\n\nThe sequence matters. A programme that starts with peel strength and stops there will pass joints that crack three months later, and it will miss the warpage that ruins a lamination yield without ever showing up in a pull test.\n\n## What the results showed\n\nAll six back-contact sources welded on the same platform with no hardware change between them. The variation that mattered was not brand to brand but batch to batch: paste thickness, finger width and cell thickness moved the working profile more than the cell maker did, which is the reason the recipe library is indexed by cell specification rather than by supplier name.\n\nThe failure modes we saw were the familiar ones, and they responded to the familiar levers. Cold joints traced back to insufficient peak or a coating that had oxidised in storage. Yellowing and ribbon embrittlement traced back to too much heat for too long. Cracks clustered where hold-down pressure was highest and cell thickness was lowest. Warpage correlated with the ribbon specification far more strongly than with the soldering profile.\n\nOn breakage, the platform is specified at or below 0.2% on Class A cells and the programme runs were consistent with that figure across cell families. The project teams that received welded samples from the cell makers' overseas operations rated joint quality and string yield above what they had seen from comparable equipment on the same cells. That is their assessment of samples, not a certification, and we treat it as a signal rather than a specification.\n\n## Where these claims stop\n\nThree limits are worth stating plainly, because a purchasing decision built on an overread claim is a bad decision.\n\nFirst, this is Ooitech's own test work plus customer trial feedback. No third-party laboratory has certified the compatibility, and no cell maker has endorsed the machine. Second, compatibility is demonstrated on the cell specifications we were given, which is not the same as every future revision of those products; a new paste or a new finger geometry is a new qualification. Third, cell type coverage is a property of the platform and the recipe, not a promise that any cell will run at nameplate throughput on the first attempt. Throughput is a function of how much inspection and handling the cell needs, and back-contact cells sit at the slower end.\n\n## What it changes for a line choosing back-contact today\n\nTwo years ago a module line buying into back contact faced a choice between a dedicated machine and a compromise. A dedicated machine locked the line to one cell source and one cell revision. A compromise meant accepting yield loss on the new cells. Coverage across the shipping back-contact products removes that trade-off, and it changes three decisions.\n\nIt changes how you write the equipment specification: cell-agnostic coverage belongs in the acceptance criteria, with a named list of cells to be demonstrated on your own material before the balance payment. It changes how you plan capacity, because a line that can switch cell families does not need a second stringer when the market moves. And it changes what you ask for in the recipe handover, because the value is in the library of qualified profiles, not in the machine's ability to hold a temperature.\n\n## The four things to ask any supplier making this claim\n\nEvery tabber supplier will now say it handles back-contact cells. The questions below separate a programme from a paragraph of marketing.\n\n- **Which cells, exactly, and at which revision?** A list of makers is weaker than a list of part numbers and paste generations.\n- **What was measured, and against what?** Placement against the pad edge, peel with the failure location recorded, warpage in millimetres per string, EL at matched settings.\n- **Can it be repeated on your cells?** A witness test on your own material, at your site or theirs, with the acceptance numbers agreed in advance.\n- **What does a changeover cost?** Time, consumables, scrap and operator training per switch, not per machine.\n\nIf a supplier answers all four with numbers and a test report, the claim is probably real. If the answer to the third is a brochure, it is not yet a compatibility programme.\n\n## Frequently asked questions\n\n### Does this mean the machine welds any cell on the market?\n\nIt means the platform has been demonstrated on the back-contact, TOPCon, HJT and PERC cells we were supplied, across 166 mm to 210 mm formats and three to twenty busbars, including busbarless layouts. A cell with a new paste, a different finger geometry or a different metallisation stack is a new qualification, not an automatic pass.\n\n### Is Ooitech claiming these cell makers endorse the equipment?\n\nNo. Their cells were the test material. Feedback came from overseas project teams that received welded samples, and we report it as feedback. No endorsement, partnership or certification is implied, and the brand names appear here only to identify the cells that were welded.\n\n### Can one machine really run HJT and back contact?\n\nYes, because the constraint on HJT is thermal and the constraint on back contact is mechanical, and both are controlled by parameters rather than hardware. HJT runs at a lower peak with a longer dwell and a gentler ramp; back contact runs at conventional reflow with tighter placement and lower hold-down force.\n\n### What throughput should you expect on back-contact cells?\n\nLower than on front-contact cells at the same platform rating, because alignment and inspection take longer per cell. The platform is rated at 1,000 to 1,200 cells per hour in the standard configuration and 2,400 in the high-speed configuration; plan back-contact lines at the conservative end and confirm with a timed run on your own cells.\n\n### Does flat ribbon matter that much on the rear?\n\nIt matters more than on the front. A round wire contacts a flat pad along a line, so the joint area is small and the peel strength is limited by geometry before it is limited by metallurgy. Flat ribbon gives a defined contact width and a lower profile, which also reduces the strain the strip imposes on a thin cell.\n\n### What happens when a new cell generation arrives?\n\nThe recipe is re-qualified: incoming EL, placement against the pad edge, cross-section, peel with failure location, post-weld EL, warpage and thermal cycling. On this platform that is a library change and a qualification run, measured in days rather than in a machine rebuild.\n\n## Final thoughts\n\nCell technology is moving faster than module lines can be rebuilt, so the equipment that wins is the equipment that does not force a decision every time the cell changes. Welding six back-contact sources on one platform is a step toward that, and the useful part is not the list of brands but the recipe library and the test discipline behind it. Ask for the test, not the claim.\n\n**Related reading:**\n\n- [SS-1500B Automatic Solar Cell Welding Machine: 1,200 Cells/h](https://www.ooitech.com/SS-1500B-Automatic-Solar-Cell-Welding-Machine-High-Speed-Tabber-Stringer-for-BC-TOPCON-PERC-Cells.html)\n- [SS-2500B Full Automatic Tabber Stringer: 2,400 Cells/h](https://www.ooitech.com/SS-2500B-Full-Automatic-Solar-Cell-Tabber-Stringer-Machine-High-Speed-Production-Line-Equipment.html)\n- [BC Cell Technology Roadmap: Structure to Process](https://www.ooitech.com/bc-cell-technology-roadmap-structure-to-process.html)\n- [Why BC Cells Are Hard to Make: AIKO's Self-Masked Two-Step Process](https://www.ooitech.com/why-bc-cells-are-hard-to-make-aiko-self-masked-two-step-process.html)\n- [PV Ribbon Structure and Types: Flat, Round and Shaped](https://www.ooitech.com/pv-ribbon-structure-and-types-flat-round-and-shaped.html)\n- [Tabber and Stringer Machine: How It Works, How to Choose](https://www.ooitech.com/tabber-and-stringer-machine-how-it-works-how-to-choose.html)\n- [Solar Module Stringing: Troubleshooting Cold Solder Joints](https://www.ooitech.com/solar-module-stringing-a-practical-guide-to-troubleshooting-cold-solder-joints-with-mind-map.html)\n- [EL Testing for Solar Panels: Inline vs Offline Setup](https://www.ooitech.com/el-testing-for-solar-panels-inline-vs-offline-setup.html)\n- [Polish Solar Manufacturer Procures Ooitech BC Tabber Stringer](https://www.ooitech.com/polish-solar-manufacturer-procures-ooitech-bc-tabber-stringer-for-next-gen-module-line.html)\n\n---\n\n##### Tags :\n\n![](/template/ooitech/assets/img/shape/06.png)\n\n![](https://cdn.ooitech.com/runtime/image/w800_h700_fitblur_v2_w800_h700_fitblur_v2_1757399770541443.webp)\n\n### Request A Quote\n\nAll uploads are secure and confidential.\n\n## We deliver expertise you can trust our service\n\nDirect-from-Factory Equipment.\n\n![](/template/ooitech/assets/img/icon/money-2.svg)\n\n### Cost-Effective Advantages\n\nWe deliver exceptional value, maximizing results while optimizing budgets for clients.\n\n![](/template/ooitech/assets/img/icon/staff.svg)\n\n### Our Experience Team\n\nOur skilled professionals specialize in innovative solutions and tailored strategies.\n\n![](/template/ooitech/assets/img/icon/certified.svg)\n\n### 15+ Years Industry Experience\n\nDeep expertise ensures reliable, trend-aware, and proven outcomes for success.\n\n![](https://cdn.ooitech.com/static/upload/image/20250910/1757477357667605.webp )\n\n![](https://cdn.ooitech.com/static/upload/image/20250910/1757477724911512.webp)\n\n![](/template/ooitech/assets/img/shape/06.png)\n\n## What Our Client Say's about us\n\nClient 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)\n\n![](/template/ooitech/assets/img/icon/quote.svg)\n\nA 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\n\n![](https://cdn.ooitech.com/runtime/image/w800_h600_fitblur_v2_2026041716444445.webp)\n\n### Jizzakh Polytechnic Institute\n\n![](/template/ooitech/assets/img/icon/quote.svg)\n\nthank you for ooitech's professional support and on time after service.\n\n![](https://cdn.ooitech.com/runtime/image/w800_h600_fitblur_v2_1784509010217979.webp)\n\n### Diarra From Africa\n\n![](/template/ooitech/assets/img/icon/quote.svg)\n\nThanks to Ooitech for providing the fully automated production equipment—your installation and after-sales service have been excellent.\n\n![](https://cdn.ooitech.com/runtime/image/w800_h600_fitblur_v2_2026041720921238.webp)\n\n### Amjad\n\n![](/template/ooitech/assets/img/icon/quote.svg)\n\nThank 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\n\n![](https://cdn.ooitech.com/runtime/image/w800_h600_fitblur_v2_1757479675272137.webp)\n\n### Mark\n\nBIPV Philippines\n\n![](/template/ooitech/assets/img/icon/quote.svg)\n\nThanks to Ooitech for providing highly suitable BC solar cell experimental equipment.\n\n![](https://cdn.ooitech.com/runtime/image/w800_h600_fitblur_v2_1776426122864564.webp)\n\n### KTECH\n\n## Our Latest Products\n\n![OEL-S2400 Solar Panel EL Tester: 4928 x 3264px](https://cdn.ooitech.com/runtime/image/w800_h600_fitblur_v2_1774351284414161.webp)\n\n- [** Rachael](./solar-panel-el-defect-tester-oel-s2400-electroluminescence-testing-machine-for-solar-module-quality-inspection.html)\n- [** 60805](./solar-panel-el-defect-tester-oel-s2400-electroluminescence-testing-machine-for-solar-module-quality-inspection.html)\n\n### OEL-S2400 Solar Panel EL Tester: 4928 x 3264px\n\nOoitech OEL-S2400 Solar Panel EL Defect Tester is an offline electroluminescence testing machine designed to detect microcracks, black spots\n\n![Single Layer Double Chamber Automatic BIPV Laminator](https://cdn.ooitech.com/runtime/image/w800_h600_fitblur_v2_1774438506273987.webp)\n\n- [** Rachael](./single-layer-double-chamber-automatic-bipv-laminator-otcy-2754dd-ooitech-solar-panel-lamination-equipment.html)\n- [** 63342](./single-layer-double-chamber-automatic-bipv-laminator-otcy-2754dd-ooitech-solar-panel-lamination-equipment.html)\n\n### Single Layer Double Chamber Automatic BIPV Laminator\n\nOoitech OTCY-2754DD Single Layer Double Chamber Automatic BIPV Laminator features 2700x5400mm dual lamination areas, upper and lower double heating\n\n![SS-1500B Solar Cell Tabber Stringer: 1200 Cells/h](https://cdn.ooitech.com/runtime/image/w800_h600_fitblur_v2_1774253968620270.webp)\n\n- [** ooitech](./SS-1500B-Automatic-Solar-Cell-Welding-Machine-High-Speed-Tabber-Stringer-for-BC-TOPCON-PERC-Cells.html)\n- [** 84619](./SS-1500B-Automatic-Solar-Cell-Welding-Machine-High-Speed-Tabber-Stringer-for-BC-TOPCON-PERC-Cells.html)\n\n### SS-1500B Solar Cell Tabber Stringer: 1200 Cells/h\n\nSS-1500B automatic solar cell welding machine by Ooitech - High-performance tabber stringer for BC, TOPCON, PERC\n\n![Ooitech Solar Panel Laminator Complete Product Catalogue](https://cdn.ooitech.com/runtime/image/w800_h600_fitblur_v2_1774438298752758.webp)\n\n- [** Rachael](./OTCY-2754DD-Single-Layer-Double-Chamber-Automatic-BIPV-Laminator-High-Performance-Solar-Module-Produ.html)\n- [** 63360](./OTCY-2754DD-Single-Layer-Double-Chamber-Automatic-BIPV-Laminator-High-Performance-Solar-Module-Produ.html)\n\n### Ooitech Solar Panel Laminator Complete Product Catalogue\n\nOoitech solar panel laminator full catalogue: 10 models, technical specs comparison, system descriptions, safety controls\n\n![Solar Panel Layup and Bussing Machine: 10W to 600W Modules, TOPCon BC PERC HJT](https://cdn.ooitech.com/runtime/image/w800_h600_fitblur_v2_1790216004194913.webp)\n\n- [** ooitech](./solar-panel-layup-and-bussing-machine.html)\n- [** 268](./solar-panel-layup-and-bussing-machine.html)\n\n### Solar Panel Layup and Bussing Machine: 10W to 600W Modules, TOPCon BC PERC HJT\n\nSolar panel layup and bussing machine combining string layup and bus ribbon soldering in one station, for 10W to 600W modules and TOPCon, BC, PERC and HJT cells, running inline with a stringer or standalone.\n\n![Shingled Stringer SL-30C: ±0.15mm, 1800mm String](https://cdn.ooitech.com/runtime/image/w800_h600_fitblur_v2_1774263321793147.webp)\n\n- [** ooitech](./automatic-shingled-stringer-sl-30c-shingled-solar-cell-welding-machine-ooitech.html)\n- [** 87645](./automatic-shingled-stringer-sl-30c-shingled-solar-cell-welding-machine-ooitech.html)\n\n### Shingled Stringer SL-30C: ±0.15mm, 1800mm String\n\nOoitech SL-30C Automatic Shingled Stringer is a high-speed shingled solar cell welding machine with 3000-5000 pcs/h capacity, CCD camera inspection\n",
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