PRAG 3.5KVA Inverter: Unequaled Flexibility with Seemingly Limitless Programmable Functions

This Studer Xtender XTM 3500 – 3.5KVA – 24V – inverter/charger has a continuous power rating of 3kVA up to an ambient temperature. In addition to this, it has a 30 minute power rating of 3.5kVA, and can deliver 9kVA for up to 5 seconds! Thanks to this very high surge power capacity, it can supply without worries loads with a high start-up current.

The battery charging current can be adjusted between 0 and 90Adc. The factory default settings include a battery charging curve best suited for lead acid batteries with gelled electrolyte (GEL). This battery charging curve can be easily adapted to other types of batteries including OPzS, NiFe, Lithium and Redox Flow, to name but a few.

The transfer system is active when an AC power source (generator, public grid, shore power…) is available at the AC input of the Xtender. The transition between inverter and transfer mode is achieved without any power cut and allows up to 50Aac of current to pass through to the loads. Similarly, the transition between transfer and inverter mode is extremely fast (max 15ms), which makes the Xtender suitable for many UPS (uninterruptable power supply) applications.

Studer Xtender XTM 3500 – 3.5KVA – 24V – PRAG Inverter Features

  • True sine wave voltage
  • Reliable and silent with any kind of load
  • Outstanding overload capabilities
  • Smart-Boost function for assistance to the source even with difficult loads
  • Automatic reduction of peak loads (power shaving)
  • Multi-stage programmable battery charger with PFC (Power Factor Correction)
  • Stand-by level adjustable over a large range and from a very low threshold
  • Ultra-fast transfer relay
  • Control by digital signal processors (DSP)
  • High efficiency
  • Easy to Install, Operate resolve Solve


  • Model   XTM:  3500-24
  • Nominal battery voltage : 24 Vdc
  • Input voltage range: 19 – 34 Vdc
  • Continuous power @ 25°C 3000 VA
  • Power 30 min. @ 25°C 3500 VA
  • Power 5 sec. @ 25°C 9 kVA
  • Maximum load  Up to short-circuit
  • Load detection (stand-by) : 2 to 25 W
  • Maximum efficiency : 94 %
  • Consumption OFF/Stand-by/ON               1.4W / 1.6W /12W
  • Output voltage: Pure sine wave 230 Vac (± 2 %) / 120 Vac (1)
  • Output frequency: Adjustable 45 – 60 Hz (1) ± 0.05 % (crystal controlled)
  • Harmonic distortion: < 2 %
  • Overload and short-circuit protection-Automatic disconnection with 3 time restart attempt
  • Overheat protection: Warning before shut-off – with automatic restart
  • Battery charger
  • Charge Characteristic: 6 steps: Bulk, Absorption, Floating, Equalization, reduced floating, periodic absorption
  • Number of steps, thresholds, end current and times completely adjustable with the RCC-02/-03
  • Maximum charging current: 90 A
  • Temperature compensation: With BTS-01 or BSP 500/1200
  • Power Factor Correction (PFC): EN 61000-3-2
  • General data: XTM 3500-24
  • Input voltage range: 150 to 265 Vac / 50 to 140 Vac (1)
More Information
Product Name Prag 3.5KVA/24V/230V Inverter-STUDER XTENDER
brand Prag
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