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3.5kVA – 24V Inverter – Studer Xtender XTM 3500


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
Asymmetric load Up to Pcont.
Load detection (stand-by) 2 to 25 W
Cos j 0.1-1
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)
Input frequency 45 to 65 Hz
Input current max. (transfer relay) / Output current max. 50 Aac / 56 Aac
Transfer time <15 ms
Multifunction contacts 2 independent contacts (potential free 3 points, 16Aac / 5Adc)
Weight 21.2 kg
Dimensions h/w/l [mm] 133 / 322 / 466
EU declaration of conformity Low Voltage Directive (LVD) 2014/35/EU:
-EN 50178:1997, EN 62109-1:2010
Electromagnetic Compliance (EMC) Directive 2014/30/EU:
– EN 62040-2:2006, EN 61000-3-2:2014, EN 61000-3-12:2011
Operating temperature range -20 to 55°C
Relative humidity in operation 95 % without condensation
Ventilation Forced from 55°C
Acoustic level < 40 dB / < 45 dB (without/with ventilation)
ISO Certification 9001:2008 / 14001:2004
Remote control RCC-02 or RCC-03 Adjustable with the RCC-02/-03
Module Xcom-232i Adjustable with the RCC-02/-03
Communication sets Xcom-LAN / Xcom-GSM / Xcom-SMS Adjustable with the RCC-02/-03
Battery Status Processor BSP Adjustable with the RCC-02/-03
Remote Control Module RCM-10 (3 m) Adjustable with the RCC-02/-03
2 aux. contacts module ARM-02
Cooling Module ECF-01
Battery temp. sensor BTS-01 (3 m) Adjustable with the RCC-02/-03
Communication cable for 3ph and // CAB-RJ45-8-2 Adjustable with the RCC-02/-03
Mounting frame X-Connect


1,492,200.00 1,805,200.00


PRAG offers you Studer Xtender XTM 3500 with its seemingly limitless programmable functions, the XTM offers unequaled flexibility compared to other products on the market.

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.

The Smart-Boost function allows the Xtender to assist the AC source via the inverter function. This way, the currents from both sources (AC-in and inverter) are combined to deliver the energy required by big loads if the loads are more than the AC source can supply.

The injection function allows the Xtender to send energy to the grid. This function is especially useful in energy storage systems where either the excess energy is injected to the grid, or a specific current is injected at a specific time of the day.

The Xtender has two auxiliary contacts, configured by default for the automatic start of a generator and the alarm function.

Studer Xtender XTM 3500 - 3.5KVA – 24V - Inverter xts-xtm-xth-en_page_09-4

Studer Xtender XTM 3500 – 3.5KVA – 24V – Inverter Design

The RCM-10 accessory offers a remote entry to control the inverter externally.

In addition, the Xtender can be equipped with a remote entry, which can be used to change functions or control the system externally.

Monitoring and control on site or remotely is possible with the RCC-02/03 remote control or with the LAN, GSM or SMS interfaces. Detailed information on all Xtender accessories can be found on the corresponding section of the website.

The Xtender communication bus is shared with the MPPT solar charge controllers of the VarioTrack and VarioString series. Inverters and charge controllers are synchronized to ensure an optimum charge of the battery and use of available energy.


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

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