COMPONENT
SJB2y · SJB2y module-integrated smart junction box
Zhejiang Minghe New Energy Technology ↗A smart PV junction box in three housings, with the electronics in the long one. Its sheet keeps the 8–60 V DC input and the 1500 V DC system maximum in separate fields, and the shutdown function depends on the signal and system you pair it with.
Covers the SJB2y model as Minghe lists it for module integration, built from its published sheet. Rapid-shutdown approval, test results and the 25-year life figure are items to request from Minghe.
General illustration of module assembly equipment, not a photograph of this model. Ask the manufacturer for current photographs and layout drawings of the configuration offered.
START WITH YOUR PRODUCTION TASK
Match your module's input needs to the exact electronics version, collect transmitter, firmware and current approval papers, then trial mounting and sealing on a traceable sample module.
SOURCE-LINKED DATA
Published specifications
Values below are published by the manufacturer, each with the date its source was checked. Ask for the figures that apply to your configuration and material in the quotation.
The manufacturer has not published a complete specification table for this entry. Request the delivered material specification, drawing where applicable and lot acceptance requirements.
01 · Manufacturer information
SJB2y electrical and environmental ratings
| Field | Listed value | What to settle with Minghe |
|---|---|---|
| Input voltage | 8–60 V DC | Your module values and the allowed operating conditions. |
| Rated current | 25A | Test conditions and the electronics version supplied. |
| Maximum system voltage | 1500 V DC | The array and application scope; the input stays at 8–60 V DC. |
| Ambient range | −40 to +85°C | Heat conditions for the whole assembly. |
| Safety class | II | Current papers for this construction. |
| Protection | IP65/IP68 (1m, 1h) | The sealed assembly and the test condition behind it. |
| Wire size | 4mm² | Full cable build, length and connector pair. |
02 · Manufacturer information
One long electronics housing and two shorter boxes
Long housing
The lid measures 175.1mm and one outer assembly dimension reaches 193.7mm. Widths of 36 and 31.4mm are drawn separately. Ask for the controlled envelope and mounting drawing so the fit check covers every measure.
Shorter boxes
Both short lid views measure 76.8mm, yet their lower drawings show different side projections. Request position labels, datums, tolerances and cable and terminal clearance for each box.
Ribbon and materials
Ribbon width tops out at 8.5mm, the insulation is PPO and the contacts are copper. Specify ribbon thickness and finish, the terminal joint and the exact material grade in your order.
Potting entry
The sheet asks for potting sealant and about 65 mL of silicone gel. Ask Minghe how that splits across the housings, the allowed tolerance, the material name and the cure and release conditions.
03 · PVYard procurement analysis
Get the signal package before choosing an inverter pairing
Minghe's sheet claims SJB2y meets the rapid-shutdown rule in NEC 2017 section 690.12 and also SunSpec. It is silent on the protocol revision, which transmitters and inverters pair with it, the firmware scope, shutdown time and residual voltage. You need those details to build a working system, and figures from a different smart box will not fit this one.
Ask Minghe for the full signalling layout, the approved sender and receiver setup, the firmware revision and its test records. Work out the target system and the current rules that apply with your own technical team. If a particular inverter or transmitter must work with SJB2y, ask Minghe to name it and supply the test that shows it.
Sources: SJB2y technical sheet (full image)Minghe SJB2y product page
04 · PVYard procurement analysis
Bring the electronics and the module assembly up together
Lock the electrical version
State which SJB2y revision, electronics and firmware you are buying and the conditions behind 25 A. Compare the module with the 8–60 V DC input, and treat the maximum system voltage as its own check. Collect the current certificate annexes.
Set the signal and system interfaces
Pick the documented transmitter, wiring and inverter or system combination. Write acceptance criteria for normal running, shutdown and failure and recovery tests based on measured response.
Get controlled mechanical instructions
Obtain drawings covering the three housings, the ribbon joint, where it mounts, where cables exit and how connectors mate. Request the polymer and contact specifications and the electronics handling rules.
Prove mounting and sealing
Confirm the adhesive and potting names, the 65 mL split, mixing where needed, fill inspection and full cure and release criteria. Run the trial on your own module glass or backsheet with production materials.
Record and approve samples
Keep component lots, firmware, drawings, process settings and the normal and shutdown test records together. Require Minghe to seek approval before changing electronics, transmitter, polymer, adhesive, site or process.
Sources: SJB2y technical sheet (full image)Minghe SJB2y product pageDEKRA 2024 company awards
05 · PVYard procurement analysis
What to put in an SJB2y request for quotation
Module electrical profile
Your input and current needs and operating conditions, together with the system voltage and the qualification route you follow.
Signal setup
Transmitter and inverter models, the firmware and protocol papers you need and the shutdown test documents.
Mechanical interfaces
Outline and terminal drawing for all three housings, ribbon shape, the mounting surface, wiring and the exact connector models.
Sealing specification
Potting split and tolerance, material compatibility, the approved process and cure and release instructions.
Commercial terms and change control
Producing site, samples, lot records, packaging and storage, delivery and a written warranty that states what the 25-year catalogue figure means for your contract.
06 · PVYard procurement analysis
Common questions on choosing SJB2y
Can a 1500 V source feed the input?
No. The input range is 8–60 V DC. The 1500 V DC figure is the maximum system voltage, a different rating.
Has Minghe published SunSpec test papers for SJB2y?
The sheet gives no model certificate, protocol version or transmitter pairing. Ask for all three before you accept a system combination.
Is the 25-year life a test result?
It is Minghe's design statement. Request lifetime test data and warranty terms if you plan to rely on it.
Is the 65 mL gel figure a dispensing recipe?
No. It is approximate and leaves out the split between housings, tolerance, sealant type and cure schedule. Ask Minghe for its controlled process.
Does the DEKRA announcement cover SJB2y rapid shutdown?
It names Minghe for 2024 junction-box and connector CB awards. SJB2y and its shutdown setup are not mentioned, so request a model certificate.
Sources: SJB2y technical sheet (full image)DEKRA 2024 company awardsMinghe SJB2y product page
TURN THIS INTO A CLEAR REQUEST
Ask about this product
Include the product-specific questions above and replace every bracket with your actual requirement. Save your edited text to your sourcing brief, then review it before submitting an enquiry. Saving a brief does not send it to a manufacturer.
Sources
Manufacturer information and our buying guidance are labelled section by section above. Each source below shows the date it was checked.
SJB2y technical sheet (full image) ↗
Source check: 2026-10-11 · Input and system voltage fields, materials, ribbon width, potting entry and Minghe's compliance statements.
Minghe SJB2y product page ↗
Source check: 2026-10-11 · The SJB2y smart box itself, separate from SJB2w and RSD-2.
DEKRA 2024 company awards ↗
Source check: 2026-10-11 · CB awards to Minghe as a company; the shutdown model is not listed.
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