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Onboard Power Supply WF4
WF-800S50-4K | 4000W | IP54 Certified | Kitefly Tethered
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Product Overview
The Kitefly WF-800S50-4K (WF4) is a regulated DC-DC onboard power module engineered for tethered UAV systems requiring stable, precision-controlled output voltage. Converting high-voltage DC input (680–800Vdc) to a fixed 50Vdc output at up to 4000W, it is purpose-built for applications where voltage stability directly impacts system performance — including tethered lighting platforms, heavy-payload surveillance drones, and high-power industrial UAV systems.
Unlike step-ratio converter modules, the WF4 is a voltage-regulated module: output is held at 50 ±0.5Vdc regardless of input voltage variation within the 680–800Vdc range, with a 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 with active current-sharing bus for high-power or redundant configurations.
Key Specifications
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Model
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WF-800S50-4K
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Compatible Ground Stations
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Any Kitefly tethered ground station with ≥4000W output (e.g. G7, NG7); higher-output stations compatible — consult team for system matching
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Input Voltage
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680–800Vdc (rated input: 750Vdc)
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Output Voltage
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50 ±0.5Vdc (regulated; range 47–50.5Vdc)
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Output Current
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80A rated, 88A maximum
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Rated Power
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4000W
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Efficiency
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≥97% (at 750Vdc input, half load)
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Voltage Regulation Accuracy
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±1%
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Output Ripple & Noise
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≤±2%Vo (20MHz bandwidth limit)
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Dynamic Response Recovery
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≤2ms (25%–50%–25% load step)
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IP Rating
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IP54 (certified); aluminum enclosure with three-proof PCB coating
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Operating Temperature
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-40°C to +50°C (forced air cooling)
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Storage Temperature
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-40°C to +80°C
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Maximum Altitude
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2000m
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Dimensions
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197 × 95 × 75mm (L × W × H)
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Weight
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1000g
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MTBF
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≥100,000 hours
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Parallel Units (max)
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≤8 units
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Warranty
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1 Year
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Availability
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In Stock (2–3 weeks if out of stock)
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Why Choose the WF4 for Your Tethered Drone System?
The WF-800S50-4K addresses a specific engineering requirement that step-ratio converter modules cannot meet: precise, stable output voltage independent of input variation. Where A-series modules output a voltage proportional to input (fixed ratio conversion), the WF4 actively regulates output to 50 ±0.5Vdc across the full 680–800Vdc input range. This makes it the correct choice for UAV platforms and payloads sensitive to voltage fluctuation — including LED lighting arrays requiring constant voltage, motor controllers with narrow input tolerance, and sensor systems where power quality affects measurement accuracy.
With 4000W rated output and support for up to 8 units in parallel via active current-sharing bus (current sharing imbalance ≤5% at >50% load), the WF4 scales cleanly to high-power platform requirements. Three-proof PCB coating ensures reliable operation in outdoor humid, salt fog, and coastal environments. The integrated fan with aluminum housing keeps the unit within thermal limits across the -40°C to +50°C operating range.
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: 55–59Vdc (auto-recovery)
• Output overcurrent protection: 86–95A (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 A-series modules like the A4 or A5?
The WF4 is a regulated voltage module: it actively holds output at 50 ±0.5Vdc regardless of input voltage variation within 680–800Vdc. A-series modules use a fixed step-down ratio, so output voltage varies proportionally with input voltage. For applications requiring stable, precision-controlled output voltage — such as LED lighting systems, sensitive avionics, or motor controllers with narrow input tolerance — the WF4 is the appropriate choice. Both series eliminate battery endurance constraints entirely when used in a tethered UAV system.
Q: Which ground stations are compatible with the WF4?
The WF4 accepts 680–800Vdc input and requires a ground station capable of delivering ≥4000W at that voltage range. Compatible Kitefly stations include the G7 and NG7, among others. In principle, any higher-output station (e.g. G15) is electrically compatible — however, oversizing the ground station beyond system requirements increases cost without operational benefit. Contact our team with your ground station model and mission power budget for a matched system recommendation.
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: Is the WF4 suitable for tethered drone lighting applications?
Yes. The WF4's regulated 50Vdc output makes it well suited for tethered lighting platforms where LED drivers require stable constant-voltage input. Its 4000W rated output provides ample headroom for large-format lighting arrays. The three-proof PCB coating and IP54-certified enclosure support outdoor deployment in humid, dusty, and salt fog environments.
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 properties at altitude should be confirmed for your specific installation environment.
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
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Email
susy@tetheredsystem.com
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WhatsApp
+86 19952400441
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Website
www.tetheredsystem.com
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Product Tags:
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50V/80A Onboard Power Supply WF-800S50-4K With Wire Skipping Terminal Kitefly Images
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