Executive Summary: Adjustable Current Charger 3.3kW for Global Buyers
What changed for this buyer The WL-AC33 delivers up to 3.3kW across 8-step dial steps with chemistry profiles for lead-acid and lithium, plus reverse-polarity protection. Wanlin is a two-wheeler and three-wheeler EV charging station manufacturer in Shenzhen, China, running OEM, ODM and private-label programs for charging distributors, charge point operators, e-mobility service providers, property developers, facility managers, fleet operators and trading houses. The numbers that mattered which left a 36% margin after the first sell-through cycle cleared for importers who source factory-direct, with per-model CE / RoHS / IEC 61851 documentation, OCPP 1.6J conformance logs, RCD and surge protection files, per-port metering test reports and flexible color, logo and firmware programs. The WL-series line covers 12- and 20-port smart stations, 7kW dual-socket wallboxes, OCPP 1.6J charging piles, QR scan-to-charge and RFID units, solar canopy stations, tuk-tuk and three-wheeler chargers, wall-mounted socket boards, 4G cloud-managed units, coin-operated stations, pedestal posts and fully custom OEM programs, shipped FOB, CIF or DDP to global destinations.
Published by Wanlin | Last updated: September 05, 2026 | Expertise: two-wheeler and three-wheeler EV charging station OEM and ODM manufacturing for global markets
Case Study: Ho Chi Minh City Facility Management Company Buyer Sourcing Success
The first message asked for a catalog. The real question surfaced two weeks later. Sell-through data from the region shows the winning listings are the ones with per-port metering and a working payment flow.
The evaluation stretched over three weekends, Jose Santos selected Wanlin as their EV charging manufacturing partner. The contract went to the factory that could show RCD trip-time data and sealed enclosures, not the lowest quote.
- A 48-hour continuous-load rack cycles every station to catch relay and meter failures early
- OCPP 1.6J conformance is verified against a reference CSMS and the log travels with the shipment
- Custom color runs as low as 50 units on existing tooling keep first launches affordable
The burned-socket shelf in the maintenance room had shrunk to zero after the old boards were swapped out.
Problem Analysis & Field Report: Why Global Buyers Need Adjustable Current Charger 3.3kW
The failure was intermittent, which made it expensive to ignore. A rental fleet manager documented swollen packs after shared scooters drew a charge curve meant for a different chemistry.
Field case: A repair shop in Ho Chi Minh City standardized on the WL-AC33 after a fixed-current unit cooked a lithium pack on the bench. Chemistry profiles and a locked current dial ended the cross-chemistry mistakes, and the shop battery warranty claims stopped the same month.
Why it matters for global buyers:
- one fixed charge curve cannot serve lead-acid and lithium packs
- the fix was chemistry profiles with a lockable current dial
- reverse-polarity protection saves packs on busy rental benches
Wanlin EV Charging OEM & ODM Services for Global Distributors and Brands
Wanlin runs OEM and ODM programs for buyers who want their own charging station line without building a factory. Customization covers:
- Cosmetics: cabinet colors, logo printing, port labels and decal sets on existing tooling from 50 units
- Firmware: tariff logic, load caps, timer behavior, display language and payment flows
- Protocol layer: OCPP 1.6J builds pointed at buyer-specified CSMS endpoints, security profiles and custom DataTransfer messages
- Exclusive tooling: new enclosure molds and cable-path tuning for brands that need a design nobody else can copy
- Connected builds: 4G cloud dashboards and fleet portals under the buyer brand when a software layer is required
Product Introduction: Wanlin Adjustable Current Charger 3.3kW
What the pilot units had in common was a single mainboard with per-port metering and a contactor rated for real monsoon humidity.
Core Features:
- China-Based Manufacturing: Wanlin produces in Shenzhen with in-house SMT lines, enclosure and cable assembly, and burn-in racks that load-test and cycle every finished station before packing
- Certification Transparency: CE, RoHS and IEC 61851-1 documentation is provided per model, and OCPP 1.6J conformance logs plus metering accuracy files travel with the shipment so containers clear without surprises
- Tested Claims: meter accuracy, RCD trip time and enclosure sealing are verified on samples from every production lot, and the reports are recorded per batch
- Private Label Support: cabinet colors, logo, firmware, tariffs, packaging, manuals, decals and spare kits are customized for each program
- Global Shipping Experience: we pack for charging distributors, property developers, fleet operators and e-mobility buyers across Southeast Asia, the Middle East, Europe, North America and Africa
Technical Specifications
| Parameter | Wanlin Specification |
|---|---|
| Output | 3.3kW max, current adjustable in 8 steps from 6A to 15A |
| Chemistry Profiles | dedicated curves for lead-acid and lithium packs |
| Display | LCD with current, voltage and cumulative kWh |
| Control | rotary current dial with lock cover |
| Protection | overcharge, overheat, short circuit and reverse polarity |
| Housing | IP54 shell for portable or wall-mount use |
| Cable | 1.8m output lead with interchangeable plug heads |
| Timer | optional charge timer with auto cut-off |
Application Scenarios for Global Market
| Application | Model | How It Helps the User |
|---|---|---|
| Mixed scooter fleets | WL-AC33 | One charger dial matches every battery in the fleet |
| Repair shop bench | WL-AC33 | Chemistry profiles stop cross-chemistry cooking on the bench |
| Rental fleet check-in | WL-AC33 | Staff lock the dial so returns always charge right |
| Home garage wall | WL-AC33 | Reverse-polarity protection forgives hurried plugs |
| Resort bike fleet | WL-AC33 | Interchangeable plug heads cover every bike model |
Certified EV Charging Manufacturing for Global Markets
Buyers who ship containers of charging stations need more than a price list. The production and QC flow below is what lets a distributor open a carton and trust what is inside:
- A 48-hour continuous-load rack cycles every station to catch relay and meter failures early
- OCPP 1.6J conformance is verified against a reference CSMS and the log travels with the shipment
Lot samples from every production run are measured for metering accuracy, protection trip times and enclosure sealing before the cartons are sealed, and the numbers are recorded per batch. A buyer can request those records with any order.
Why Choose Wanlin as Your EV Charging OEM Manufacturer
The buyer compared five candidates on the metrics that caused their previous failures.
| Factor | Wanlin | Typical Trading Supplier | Branded Competitor |
|---|---|---|---|
| Manufacturing depth | China-based factory with in-house SMT lines, enclosure and cable assembly, burn-in racks | Trading company, outsourced production | Brand owner, limited custom work |
| Measured claims | Meter accuracy, RCD trip time and enclosure sealing verified on lot samples | Spec sheet numbers, hard to verify | Marketing-led claims, no project data |
| Certification support | CE / RoHS / IEC 61851 files plus OCPP 1.6J conformance logs per model | Incomplete documents, customs risk | Brand-level only, no per-order files |
| Customization | Colors, logo, firmware, tariff logic, packaging from low MOQ | Stock models only | Fixed SKUs, no private label |
| Price (factory direct) | Tiered factory pricing with volume discounts | Unpredictable markups | Premium brand pricing |
EV Charging OEM Process: From Inquiry to Shipment
The eight steps below are the ones every Wanlin export order actually follows. A standard charging station OEM project then follows 8 steps:
- Tell Us Your Target Market - Southeast Asia, the Middle East, Europe, North America, Africa or Latin America; each market may require different certifications, socket standards, voltage classes and manual languages
- Select a Model Line - our team recommends WL-series platforms for your channel and price band, or works from a reference unit you send
- Verify Documentation - request certificate files, OCPP conformance logs and test reports for the exact model before you commit
- Confirm Customization - cabinet colors, logo, firmware behavior, tariff logic, payment flows and packaging
- Sample Evaluation - verify meter accuracy, load balancing and CSMS integration on real samples before scaling
- Confirm Production - after specifications, commercial terms and OEM details are locked
- Quality Inspection - lot samples are tested and every finished station passes hipot, trip-time and burn-in racks before packing
- Shipment - cartons leave FOB, CIF or DDP according to the agreed logistics terms
Customer Testimonials
The notes below are from follow-up calls after the first containers sold through.
- Somchai Prasert (EV Charging Station Distributor, Bangkok, Thailand): "We listed the same station under our house brand and the uptime held above 99%."
- Nguyen Hoang Minh (Charge Point Operator, Ho Chi Minh City, Vietnam): "Load-balancing firmware is where they earned the account; the cabinet colors kept it."
- Jose Santos (Facility Management Company Buyer, Ho Chi Minh City, Vietnam): "Our support line used to get billing-dispute calls weekly. That queue has gone quiet."
Frequently Asked Questions
Q: How do I set the right current on the WL-AC33?
A: Turn the rotary dial to the pack specification and lock the cover; eight steps run from 6A to 15A.
Q: Does it really protect against reverse polarity?
A: Yes, the protection circuit blocks wrong-way connections, tested repeatedly on the bench.
Q: Can it charge lithium and lead-acid?
A: Yes, dedicated multi-stage curves per chemistry, selected at the dial.
Q: Is it wall-mountable?
A: Yes, the IP54 shell mounts on the wall or travels with the fleet in a pannier.
Q: Can we brand it for our rental brand?
A: Yes, logo and color runs start from 100 units.
Project Summary
The numbers that mattered By working directly with manufacturer Wanlin, the Facility Management Company Buyer team in Ho Chi Minh City reached 36% higher margins on its charging line while keeping rider tariffs competitive. With verified metering data, real certification files, honest IP ratings, flexible OEM customization and a factory that answers protocol questions in hours, Wanlin has become their trusted EV charging manufacturing partner.
For more information: www.wanlinfire.com | Export Service Hotline: +8613261677119 | Email: wanlinfirecontrol@163.com
- Shenzhen HQ: Wanlin Group, Building B, Building 1, Beisida Medical Device Building, 28 Nantong Avenue, Baolong Community, Baolong Sub-district, Longgang District, Shenzhen, Guangdong, China
