Input Voltage 800V-1000V Onboard Power Supply For Drone WF-1000S60-4K Kitefiy

Product Overview

The Kitefly WF-1000S60-4K (WF4) is a regulated DC-DC onboard power module engineered for tethered UAV systems operating on higher-voltage ground power infrastructure. Converting high-voltage DC input (800–1000Vdc) to a fixed 60Vdc output at up to 4000W, it is designed for 14S drone platforms and applications where stable, precision-controlled output voltage at higher potential is required — including tethered lighting systems, heavy-payload surveillance drones, and high-power industrial UAV configurations.

The WF4 is a voltage-regulated module: output is held at 60 ±0.6Vdc regardless of input voltage variation within the 800–1000Vdc range, with voltage regulation accuracy of ±1% and output ripple ≤±2%Vo. The aluminum enclosure houses an integrated forced-air cooling fan achieving ≥97% conversion efficiency, with three-proof PCB coating (moisture, mildew, salt fog) for sustained outdoor field operation. Up to 8 units can be paralleled via active current-sharing bus for high-power or redundant configurations.

Key Specifications

Why Choose the WF4 for Your Tethered Drone System?

The WF-1000S60-4K addresses a specific engineering requirement that step-ratio converter modules cannot meet: precise, stable output voltage independent of input variation across a high-voltage 800–1000Vdc input range. Output is actively regulated to 60 ±0.6Vdc, making the WF4 the correct choice for 14S drone platforms (nominal 51.8V battery architecture) and payloads sensitive to voltage fluctuation — including LED lighting arrays, motor controllers with narrow input tolerance, and sensor systems where power quality affects measurement accuracy.

The higher input voltage range (800–1000Vdc vs. WF4's 680–800Vdc) makes the WF4 compatible with ground stations operating at elevated DC bus voltages, reducing transmission line current for the same power level — a practical advantage in longer cable deployments. With 4000W rated output and support for up to 8 units in parallel via active current-sharing bus (imbalance ≤5% at >50% load), the WF4 scales cleanly to demanding platform requirements. Three-proof PCB coating ensures reliable operation in humid, salt fog, and coastal field environments.

Protection & Safety Features

• Input undervoltage protection: 620–640Vdc (auto-recovery ≤650Vdc; hysteresis >10V)

• Input overvoltage protection: 810–830Vdc (auto-recovery ≥800Vdc; hysteresis >10V)

• Input reverse connection protection: no damage on 800Vdc reverse input

• Output overvoltage protection: 65–69Vdc (auto-recovery)

• Output overcurrent protection: 74–80A (auto-recovery)

• Output short-circuit protection (auto-recovery)

• Over-temperature protection (auto-recovery)

• Parallel current sharing: active current-sharing bus; imbalance ≤5% at >50% load; up to 8 units

• Insulation: Input to output 2500Vdc withstand voltage / 2mA / 1min; no arcing or breakdown

• PCB flame retardant grade: V-0 per GB4943.1-2011

• System noise: ≤55dB(A)

• EMC: EN55022, EN55024; IEC 61000-4 series (ESD, radiated immunity, EFT, surge, conducted immunity)

Frequently Asked Questions

Q: How is the WF4 different from the WF4 and A-series modules?

The WF4 (WF-1000S60-4K) operates on a higher input voltage range of 800–1000Vdc versus the WF4's 680–800Vdc, and delivers a regulated 60Vdc output versus the WF4's 50Vdc — making it the correct choice for 14S drone platforms and ground stations operating at elevated DC bus voltages. Both WF-series modules are voltage-regulated: output is held constant regardless of input variation, which distinguishes them from A-series step-ratio converter modules where output voltage tracks input proportionally. For applications requiring precision output voltage stability, either WF model is preferred over A-series.

Q: Which ground stations are compatible with the WF4?

The WF4 accepts 800–1000Vdc input and requires a ground station capable of delivering ≥4000W at that voltage range. The higher input voltage range means the WF4 is suited to ground stations with elevated DC bus output — contact our team with your ground station model and output specifications to confirm compatibility and optimize system matching.

Q: Is the WF4 suitable for 14S drone platforms?

Yes. The WF4 outputs a regulated 60Vdc, which is compatible with 14S battery architectures (nominal 51.8V, max charge 58.8V). Its regulated output ensures stable voltage delivery regardless of input variation — important for 14S platforms where motor controllers and ESCs may have tighter input voltage tolerance than 6S or 12S systems. Confirm your specific drone platform's input voltage range with your manufacturer before installation.

Q: What is the advantage of the higher input voltage range (800–1000Vdc) versus WF4's 680–800Vdc?

At the same 4000W power level, a higher transmission voltage means lower line current — which reduces resistive losses in the tether cable and allows longer cable runs for the same power delivery efficiency. If your application involves longer tether lengths or your ground station operates at a higher DC bus voltage, the WF4 may offer a more efficient system architecture than the WF4.

Q: Why does the drone still need a fully charged battery during tethered flight?

The drone must carry a fully charged battery at all times during tethered operation. If ground power is interrupted for any reason, the system seamlessly switches to battery power with zero voltage transient, enabling a controlled emergency landing. The WF4 operates in parallel with the battery — not as a replacement for it.

Q: Can multiple WF4 units be used together?

Yes. The WF4 supports active current-sharing bus parallel operation with up to 8 units, with current sharing imbalance ≤5% at loads above 50%. This allows scalable power configurations for large-platform or high-redundancy applications. Contact our team to discuss your specific power architecture.

Q: What is the altitude rating of the WF4?

The WF4 is rated for operation from 0 to 2000m altitude. For deployments above 2000m, contact our technical team — forced-air cooling efficiency and dielectric performance at altitude should be confirmed for your specific installation.

Q: What is the lead time and availability?

The WF4 is available in stock for immediate shipment. If current stock is insufficient for your order, lead time is 2–3 weeks. Contact Ms. Susy for real-time availability and volume pricing.

Related Products

A2 (400S48, 530g, 2000W) | A3.5 (400S48, ≤1.3kg, 3200W/5000W peak) | A4 (400S50, ≤800g, 3500W/4300W peak, IP65) | A5 (400S48, 1500g, 4500W/5000W peak) | A7 (800S59, ≤2.3kg, 6000W/6800W peak, IP65)

Contact Us

Founded in 2018, Airfly Tethered is a national high-tech enterprise specializing in the research, development, and manufacturing of tethered UAV power systems. As one of Jiangsu Province’s leading intelligent manufacturing companies, Airfly is dedicated to advancing tethered technologies that enable safe, efficient, and continuous drone operations.

Based in Nanjing, China, Airfly collaborates with domestic and international partners to provide high-quality, high-performance tethered modules and power stations for UAV applications worldwide.
Our flagship products include the A4, WF4, and FW6 airborne power modules (6kW, compatible with 750V ground stations), and the G4 and G7 ground tether power stations (7kW / 750V)—widely recognized as reliable, market-proven solutions.

Driven by the philosophy of “Technology Empowers, Innovation Leads,” Airfly partners with renowned universities such as Nanjing University, Southeast University, and NUIST, forming a strong R&D team with cutting-edge expertise. We not only deliver industry-leading standard products but also provide customized non-standard tethered solutions to meet clients’ specialized needs.

Airfly Tethered serves over 600 domestic and 80 international clients, with exports to the U.S., Europe, the Middle East, South Africa, and Southeast Asia. Our tethered systems play critical roles in power inspection, communications, monitoring, emergency response, firefighting, and security.

Looking ahead, Airfly will continue to expand the boundaries of tethered UAV applications, creating greater value for customers worldwide and powering the future of intelligent aerial operations.

Original Innovation — Confident Tethering Since 2013

Phone: +86 19952400441 / +86 199 5178 6845

WhatsApp: +86 199 5240 0441

Email: susy@tetheredsystem.com / evan@tetheredsystem.com

Address: Room 1813, Building C, No. 88 Pubin Road, Pukou District, Nanjing, China

Website: www.tetheredsystem.com

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