Energy Storage Connectors for BESS: 70A–500A, 1500V DC
CN series push-in connectors cover 70A to 500A at 1500V DC with IP67 protection, plus stackable options for residential battery stacks. Match a model to your current rating, cable size, and cabinet layout.These energy storage connectors help BESS manufacturers build safe, reliable high-voltage DC connections.
What is an energy storage connector?
An energy storage connector is the high-voltage link between battery cells, modules, racks, and inverters in a battery energy storage system (BESS). It carries DC current between battery packs and power conversion equipment, and it has to hold up under heat, vibration, moisture, and repeated plugging.
Voltage Rating
1500V DC
Current Classes
70A–500A
Housing Safety
PA66 UL94 V-0
Dielectric Strength
4000V AC
The CN series from PVLINKTECH is a push-in connector family built specifically for storage applications. It covers five current classes — 70A–120A, 150A–200A, 250A–300A, 250A–350A, and 400A–500A — all rated up to 1500V DC. Contacts are silver-plated copper alloy, the housing is PA66 with UL94 V-0 flame retardance, and every model comes in straight and right-angle versions. A one-key release latch and 360° cable rotation keep field wiring simple.
DC Arc Suppression & Mechanical Reliability
DC arc behavior is the reason storage connectors are designed differently from ordinary power connectors. At 1500V DC, an arc can sustain far longer than at the same AC voltage, so the plug must disconnect cleanly and lock positively. The CN series uses a self-locking latch with one-key release, a finger-spring high-current contact that increases the contact area, and a thermoplastic housing with high dielectric strength (4000V AC on most models). These are the mechanical details that separate a connector rated for storage duty from one that only looks similar.
Where do energy storage connectors sit in a BESS?
A battery energy storage system (BESS) has several connection points, and BESS connectors at each point carry different current levels. Inside a battery pack, cells are welded or bolted together. Between the pack and the rack, cables run through connectors — this is where a push-in connector like the CN series does its job. Between racks and the DC bus, or between the cabinet and the inverter, the current is higher and the cable heavier.
In practice, the CN series covers pack-to-rack and rack-to-cabinet connections from 70A to 500A. The stackable connectors handle module-to-module interconnection inside stacked residential systems. If the connection point terminates on a busbar instead of a cable, a bolt or copper bar connector is the right tool — a separate family we cover on the battery busbar connector page .
Engineering Tip
Map the current at each connection point before you choose. A connector only has to carry the current of its own segment, not the full system current, which is why a 120A connector and a 500A connector can both be correct in the same installation.
Technical Datasheet
DC 1500V Ready
ESS Standard
Energy Storage Connectors: CN Series Ratings at a Glance
Key electrical performance thresholds, wire termination dimensions, and withstand insulation parameters across the entire CN connector portfolio.Our energy storage connectors cover multiple current ratings, cable sizes, and 1500V DC requirements.
| Model | Current Rating | Voltage Rating | Cable Size | Contact Resistance | Dielectric Strength |
|---|---|---|---|---|---|
|
06
CN06
|
70A / 100A / 120A | 1000V / 1500V DC | 10 / 16 / 25 mm² | ≤0.2 mΩ | 3000 / 4000V AC |
|
08
CN08
|
150A / 200A / 250A | 1500V DC | 35 / 50 / 70 mm² | ≤0.2 mΩ | 4000V AC |
|
10
CN10
|
200A / 250A / 300A | 1500V DC | 50 / 70 / 95 mm² | ≤0.5 mΩ | 4000V AC |
|
12
CN12
|
250A / 300A / 350A | 1500V DC | 70 / 95 / 120 mm² | ≤0.5 mΩ | 4000V AC |
|
14
CN14
|
400A / 450A / 500A | 1500V DC | 150 / 185 mm² | ≤0.5 mΩ | 4000V AC |
Common Specs Across the Series.
Single core, IP67, UL94 V-0 flame retardant rating, durable PA66 housing, silver-plated copper alloy contacts, insertion force ≤75N , insulation resistance >500MΩ , ≥500 mating cycles, operating temperature -40°C to +125°C .
Certifications:
CE
UL (certificate scope per model)
RoHS
Engineering Deep Dive:
Contact Resistance & Thermal Reliability
Contact resistance is the number to watch on paper. The CN06 and CN08 hold it at ≤0.2 mΩ , the larger models at ≤0.5 mΩ (measured at 100mA). Lower contact resistance means less heat generated at the junction, which is what keeps temperature rise low when a pack runs at full current for hours. The silver plating on the copper alloy contacts also resists oxidation, so the resistance does not creep up over the service life the way unplated contacts can.
Engineering & Technical Specs
1000V vs 1500V DC — Why the Voltage Class Matters
Utility-Scale 1500V Transition
The storage industry has been moving toward 1500V DC for utility-scale systems. At equivalent power, higher DC bus voltage delivers higher efficiency with lower current throughput.
Key Trade-off: Connectors, cabling, and insulation must reliably withstand significantly higher potential while maintaining verified engineering safety margins.
- Thinner Cables: Reduced copper material cost and weight
- System Simplicity: Fewer parallel strings to balance & manage
CN Series High-Voltage Engineering
The CN series is purpose-engineered for high-potential demands: every model is rated 1500V DC, offering up to 4000V AC dielectric strength on CN08 through CN14 (CN06 rated 3000V/4000V AC).
Housing materials and creepage distances are sized for long-term 1500V DC continuous service. If your system still operates on a 1000V DC bus, CN06 seamlessly covers both classes.
- Anti-Disconnect Latch: Stops plug release under electrical load
- Engineered Creepage: Extended insulation distance for safety
Critical Safety Requirement:
Do not mix voltage classes on a single string.
If the system is designed for 1500V DC,
use connectors rated for 1500V DC end to end.
Quick Guide
How to Choose the Right Energy Storage Connectors
-
1
Define the working current.
Selecting energy storage connectors starts with matching the electrical and mechanical requirements of each connection point.Take the nominal current of the circuit and leave headroom for temperature rise. A 200A continuous circuit belongs in the CN10 or CN12 range, not CN08.
-
2
Match the cable.
Each model pairs with a cable range: 10–25 mm² (CN06), 35–70 mm² (CN08), 50–95 mm² (CN10), 70–120 mm² (CN12), 150–185 mm² (CN14). Use the cable the system already specifies, then pick the model that fits both it and the current.
-
3
Check the voltage class.
All CN models are rated 1500V DC; CN06 additionally covers 1000V DC systems.
-
4
Pick the form factor.
Straight for in-line cable runs, right-angle for tight spaces and low-profile routing.
-
5
Confirm the terminal and panel.
Choose the terminal style (M / LD / LM / T) and confirm the panel opening and mounting hole pattern (M4 for CN06–CN12, M5 for CN14).
For a fuller walkthrough of sizing and application cases,
see our
1500V BESS connector selection guide
Technical Assembly Guide
Installation & Wiring Notes
Mechanical mounting dimensions, mating integrity, and terminal wire assembly specifications.Correct installation helps energy storage connectors maintain electrical reliability, sealing performance, and service life.
Panel Openings & Mounting Dimensions
| Model | Cutout Diameter | Mounting Holes |
|---|---|---|
| CN06 | 18 ± 0.1 mm | 4 × M4 |
| CN08 | 21 ± 0.1 mm | 4 × M4 |
| CN10 | 25 ± 0.1 mm | 4 × M4 |
| CN12 | 27 ± 0.1 mm | 4 × M4 |
| CN14 | 30 ± 0.1 mm | 4 × M5 |
Pre-Production Inspection:
Confirm panel thickness and surface plating of the mounting
area before production; cutout dimensional tolerance directly
affects seal performance.
Mechanical Specs & Field Check
≤ 75 N
Insertion Force
≥ 500
Mating Cycles
Insertion force is rated at ≤75N across the entire series. The durability rating of ≥500 cycles ensures full coverage for standard equipment maintenance intervals.
Field Inspection Guideline
Consistent plugging force serves as a reliable field indicator.
If a connector feels noticeably harder or looser to mate,
stop and inspect contacts and locking latch before proceeding.
Terminal & Cable Assembly Workflow
1
Cable Stripping
Strip cable jacket and conductor insulation strictly according to the specified lengths in the datasheet.
2
Precision Crimping
Crimp conductor terminals using the manufacturer-specified, matching crimp die tooling.
3
Pull-Out Force Check
Perform and verify crimp pull-out retention force requirements prior to final shell assembly.
CN06 or CN08 – Which one fits your battery pack?
The quickest way to narrow the family is by application size:Both models are energy storage connectors designed for different battery current and cable-size ranges.
| Application | Typical Current | Recommended Model |
|---|---|---|
| Residential battery / small home storage | up to ~120A | CN06 (70A / 100A / 120A) |
| Commercial & industrial storage, rack-level | ~150A–250A | CN08 (150A / 200A / 250A) |
| Utility / larger racks | ~200A–350A | CN10 or CN12 |
| High-power containers, 500A-class | 400A–500A | CN14 (150–185 mm² cable) |
REQUEST AN ENERGY STORAGE CONNECTOR SAMPLE
PVLinkTech provides product samples so you can evaluate quality, fit, and performance before placing an order.
Free Sample Request
Tell us about your project and our team will help you select the right waterproof connector sample.
24H Express Dispatch
7-Day Global Delivery
Connector Orientation Comparison
Straight or Right-Angle Energy Storage Connector?
Both straight and right-angle versions are available across the CN series, allowing the connector layout to match the available cabinet space and cable routing requirements.
180° In-Line
Straight Connector
Keeps the cable aligned with the mating direction, making it suitable for vertical cable runs, open layouts, and installations where rear cabinet clearance is not limited.
Best Suited For:
- Vertical Cable Runs: Direct routing with minimal cable deflection
- Open Layouts: Battery racks and containerized BESS with sufficient rear clearance
- Deep Cabinets: Installations where connector depth is not a limiting factor
90° Low-Profile
Right-Angle Connector
Routes the cable at 90°, helping reduce the space required behind the connection point. It is particularly useful where cabinet depth or cable bend radius is restricted.
Best Suited For:
- Shallow Cabinets: Reduced rear clearance requirements
- High-Density Racks: Compact battery and energy storage layouts
- Restricted Bend Radius: Helps reduce unnecessary cable bending close to the termination
Shared Engineering Features Across Both Configurations
Same Platform
Housing Material
PA66
Ingress Protection
IP67
Cable Outlet
360° Rotation
Disconnect Design
One-Key Release
Push–in or busbar connection?
Not every connection point in a storage system is a cable-to-connector joint. Some battery packs and distribution panels terminate on busbars, and for those points a bolt or copper bar connector is the right tool rather than a push-in connector. A push-in energy storage connector is ideal when a battery system needs a serviceable cable connection and fast field installation.
CN Push–in Series
Designed for flexible field assembly and rapid maintenance cycles without specialized torque tools.
- Fast mating: Tool-less push-to-click engagement reduces field installation time.
- Field serviceable: Cable connections can be disconnected for system inspection, maintenance and replacement.
- Ideal placement: Cable-to-connector joints throughout battery racks and modular enclosures.
Bolt & Copper Bar Connectors
Optimized for permanent, continuous high-current power transfer directly onto heavy copper rails.
- Ultra-high current: Designed for high-current applications with ratings up to 600A, depending on connector configuration and operating conditions.
- Direct busbar interface: Secure mechanical connection directly to distribution panels and battery busbars.
- Permanent integrity: Suitable for fixed high-current joints where mechanical stability and long-term reliability are required.
Technical Validation
IP67 Verified
Are these connectors waterproof enough for outdoor cabinets?
Our IP67 storage connectors are dust-tight and protected against temporary immersion in water.
Ingress Rating
IP67 Sealed
Dust-tight and protected against rain and temporary immersion
Operating Temperature
–40°C to +125°C
CN Series industrial thermal range
Contact Resistance
≤ 0.2–0.5 mΩ
Silver-plated contacts for low heat rise
Flammability Standard
UL94 V-0
High-grade PA66 engineered housing
Temperature is an essential separate validation criterion. The CN series is engineered to operate across –40°C to +125°C. Silver-plated contacts maintain contact resistance at ≤ 0.2–0.5 mΩ, helping minimize heat rise under sustained load. The robust PA66 housing meets the UL94 V-0 flammability rating.
Application Advisory: If your cabinet installation involves standing water or continuous submersion, please notify our engineering team before specification. We review application conditions before quotation to help ensure the selected connector is appropriate for the intended operating environment.
Stackable Connectors for Battery Stacks
For modular battery stacks, PVLinkTech offers two stackable connector solutions. They are mechanically different from the CN series and are designed for pack-level interconnection rather than rack-level cabling.
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| Model | Current Rating | Voltage Rating | Contact Material | Protection | Mounting |
|---|---|---|---|---|---|
|
70A Stackable (Floating)
|
50A–70A | 220V DC | Gold-plated brass | UL94 V-0 | Floating, panel T=3.0mm |
|
240A Stackable (Stationary)
|
120A–240A | 1500V DC | Silver-plated copper | IP67 UL94 V-0 | Stationary, M4 |
Floating Version (Residential Stacks)
Tolerates alignment errors between stacked modules, helping speed up on-site assembly for residential battery installations.
Stationary Version (Commercial Packs)
Designed for heavy-duty commercial battery packs, supporting power connections up to 240A at 1500V DC.
Terminal options and customization
Every CN connector is available with four terminal styles:
M — threaded hole type
LD — screw type
LM — nut type
T — through-hole type
Certifications & Quality Assurance
Rigorous testing standards and complete in-house manufacturing control for tier-1 renewable & BESS reliability.
Full In-House Manufacturing Control.This manufacturing control helps ensure consistent quality across every energy storage connector supplied for BESS projects.
PVLINKTECH runs CNC machining, mold making, injection molding, and assembly in-house across an 6,800 m² facility founded in 2015. With connector bodies, tooling, and final assembly under one roof, we eliminate third-party delays, shorten sample lead times, and enforce rigorous quality gates at every single step.
6,800 m²
Modern Plant
> 99%
Pass Rate
100%
Batch Traceability
Advanced Test Capabilities
The CN series carries CE and RoHS certification, with UL certification available per model. Every batch ships with certified inspection reports and material certificates on request.
Our specialized testing facilities feature:
Utility-Scale Proven: 120MW PV Plant Deployment
PVLINKTECH’s connection products have shipped into large-scale renewable projects, including a 120MW PV plant in Indonesia (Tier-1 EPC) where the connectors have operated continuously for 18 months without a single field failure. Our dedicated BESS energy storage connector line comes off the exact same production floor under the same zero-defect quality system. * Detailed references available under NDA for serious buyers.
Field Track Record
18 Months
Zero Field Failures
FAQ
CN06 covers 70A–120A with cables from 10 to 25 mm² and is available at 1000V or 1500V DC. CN08 covers 150A–250A with cables from 35 to 70 mm² and is rated 1500V DC. Choose by working current first, then cable size.
Yes. The CN12 is rated 250A–350A at 1500V DC with cables from 70 to 120 mm². Confirm the cable matches the terminal and the circuit stays within the rated current with headroom for temperature rise.
The CN series is rated IP67 — dust-tight and protected against temporary immersion. The 240A stackable connector is also IP67. The 70A floating stackable connector is rated UL94 V-0 without an IP code.
Yes. Every CN model is available in straight and right-angle versions. The cable outlet rotates 360°, and the latch releases with one key press.
The CN14 accepts 150 mm² or 185 mm² cable and is rated 400A–500A at 1500V DC. It uses M5 panel mounting holes.
Yes. Four terminal styles are standard: threaded hole (M), screw (LD), nut (LM), and through-hole (T). Terminal types, cable assemblies, colors, and panel designs can be customized. Contact us with your application details.
CN06 uses 18±0.1 mm, CN08 21±0.1 mm, CN10 25±0.1 mm, CN12 27±0.1 mm, and CN14 30±0.1 mm. Mounting holes are 4×M4 (CN06–CN12) or 4×M5 (CN14).
The 70A floating version tolerates alignment error between stacked modules and is rated 220V DC. The 240A stationary version carries 120A–240A at 1500V DC for higher-current commercial packs.