Onboard Power Supply A3.5(400S48,900g) Kitefiy

Product Specification

Onboard Power Supply A3.5 (AF-400S48-3.5K) – 3200W Rated / 5000W Peak Tethered UAV Power Module

The Kitefly AF-400S48-3.5K is the highest-power onboard module in the Kitefly tethered power supply series. Delivering a rated output of 3200W with transient peak capacity up to 5000W at 48Vdc/75A, it is engineered for heavy-payload tethered UAV platforms where sustained high-power delivery and mission-critical reliability are non-negotiable. Like all Kitefly tethered power systems, it eliminates battery endurance constraints entirely — enabling continuous flight for as long as the mission demands.

Key Specifications

l Model: AF-400S48-3.5K

l Compatible Tethered Systems: Kitefly G4, G7

l Input Voltage: 360–410Vdc (maximum limit: 450Vdc)

l Output Voltage: 44–52.2Vdc (typical 48Vdc)

l Output Current: 50A typical, 80A max

l Rated Power: 3200W | Transient Peak Power: 5000W

l Efficiency: up to 98%

l IP Rating: IP55

l Operating Temperature: -40°C to +55°C

l Maximum Altitude: 5000m

l Dimensions: 188 × 136 × 56mm (L × W × H, excluding cables)

l Weight: ≤1.3kg

l MTBF: ≥100,000 hours

l Warranty: 1 Year

l MOQ: 1 unit | Availability: In Stock (2–3 weeks lead time if out of stock)

Why Choose the A3.5 for Your Tethered Drone System?

The AF-400S48-3.5K is purpose-built for the most demanding tethered UAV missions — large multi-rotor platforms, heavy sensor payloads, tethered lighting arrays, and high-power DC motor applications. Its 5000W transient peak capability handles sudden power spikes during aggressive maneuvers or motor surge events without voltage drops or system interruption.

With up to 98% conversion efficiency, three-proof PCB coating for humidity and corrosion resistance, IP55 weatherproofing, and a -40°C cold-start rating, the A3.5 is designed to perform reliably across the full spectrum of field environments — from the desert heat of the Middle East and Gulf region to high-altitude mountain operations in Central Asia and South Asia.

The module supports active current-sharing parallel operation with redundancy function, allowing multiple A3.5 units to be combined for even higher total system power on large-platform applications.

Protection & Safety Features

l Output overcurrent protection: 120A threshold (auto-restart after lockup)

l Output short-circuit protection (auto-restart after lockup)

l Over-temperature protection with self-recovery

l Output overvoltage protection: 56V

l Input overvoltage protection: 420–450V (self-recovery)

l Input undervoltage protection: 420–436V

l Insulation: Input to output 2000Vac withstand voltage

l EMC compliant: IEC61000-4-5 Level 3 (Surge), EN55022 Class A

l Power status indicator: 3 green LED lights (internal, visible during operation)

Frequently Asked Questions

Q: How does the A3.5 compare to the A2 and A1.5 in the Kitefly lineup?

A: The A3.5 delivers the highest power output in the standard Kitefly onboard module series — 3200W rated and 5000W peak, compared to 2000W peak for the A2 and 1500W for the A1.5. It is designed for heavier UAV platforms, larger payloads, and applications where power headroom and transient response are critical. All three models share the same IP55 rating, -40°C cold-start capability, and 5000m altitude rating.

Q: How long can a drone fly continuously with the A3.5?

A: The Kitefly tethered power system is designed to replace battery dependency entirely. Unlike battery-powered drones limited to 20–40 minutes per charge, a drone connected to the A3.5 can fly continuously for hours or days, depending on mission requirements. Actual continuous operation time is determined by the drone's own motor endurance, thermal management, and mechanical lifespan — not by the power supply. For extended high-power missions, follow your drone manufacturer's maintenance recommendations to protect motor and component longevity.

Q: Why does the drone need a fully charged battery at takeoff?

A: The drone must carry a fully charged battery throughout tethered flight as a safety backup. If ground power is interrupted for any reason, the system automatically switches to battery power with zero voltage transient drop, allowing the drone to perform a safe emergency landing. The A3.5 works in parallel with the battery — not as a replacement for it.

Q: Can multiple A3.5 units be used together for higher power?

A: Yes. The A3.5 supports active current-sharing parallel operation with redundancy function. Multiple units can be combined to scale total system power beyond 3200W for large-platform or multi-motor UAV configurations. Contact our team to discuss your specific power architecture requirements.

Q: Is the A3.5 suitable for high-temperature or high-altitude environments?

 A: Yes. The A3.5 is rated for operation from -40°C to +55°C with forced air cooling, carries an IP55 weatherproof rating, and is certified for altitudes up to 5000m. It is well-suited for demanding deployment environments including the Middle East, North Africa, the Indian subcontinent, and high-altitude regions.

Q: What is the lead time and availability?

A: The A3.5 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:

 susy@tetheredsystem.com

 WhatsApp: +86 19952400441