Products -> Inverter - charger -> Steca -> Xtender


xtender - inverter-charger

Steca Xtender

The Xtender series provides an unmatched freedom of use due to its many functions. In a basic application, it offers a total package: the functions of inverter, battery charger, transfer system and assistance to the source. These functions can be combined and controlled in a totally automatic way for exceptional ease and optimal management of available energy.

Its programmable auxiliary contacts also permit interconnection with existing systems or the implementation of extended functions. Fully programmable by means of its remote control, it enables the software update; thus making it an upgradeable product to which new functions may be added further on. Through the implementation of several units, it is possible to create a 3-phase source or to set them in parallel, in order to increase the power available. Up to 9 Xtender series inverters can then be combined together.

Product features

  1. True sine wave voltage
  2. Excellent overload capabilities
  3. Optimal battery protection
  4. Adjustable integrated battery charger
  5. Multistage programmable battery charger with PFC
  6. Automatic load detection
  7. Standby load detection adjustable over a wide range, starting from a low value
  8. Parallel connectable
  9. Best reliability
  10. Can be used as a back-up system or uninterruptible power supply (UPS)
  11. Contact multifonction
  12. Adjustable power sharing
  13. Reliable and noiseless with any kind of load
  14. Support of sources of alternating current (Smart Boost)
  15. Automatic support for peak loads (Power Shaving)
  16. Ultra-fast transfer relay
  17. High efficiency
  18. Control by digital signal processor (DSP)

  1. Deep discharge protection
  2. Battery overvoltage shutdown
  3. Overtemperature and overload protection
  4. Short circuit protection
  5. Reverse polarity protection by internal fuse
  6. Acoustic alarm at deep discharge or overheating

These potential-free contacts can be programmed for many different applications. They can react to any event outside or inside of the inverter (grid availability, battery voltage, fault message ...) They can also be programmed on a timer or can be switched on during particular times (at night, at the weekend ...). In this way, they can serve to start up a generator, to switch off less important loads, to signal a fault, to charge batteries depending on the situation, etc.

With the smart-boost function, the output of another source of alternating current, such as a power generator or a land connection, can be increased; even when special loads are being used (inductive, asymmetric, with high switch-on current). It is also possible to combine the Steca Xtender XTS with almost all inverters which are already present in order to increase the available output.

Inverter - Charger

The basic functions of the combined inverter of the Steca Xtender series are the inverter, the battery charger, the switching function and the support of external sources of alternating current. These functions can be combined and controlled fully automatically, the range offers outstanding user-friendliness and very good exploitation of the energy available.

Several Steca Xtender can be connected in parallel or to form a three-phase system. That means that up to nine Steca Xtender can work together.

Hybrid systems

Alongside solar energy, photovoltaic hybrid systems generally employ a diesel generator, a wind turbine or the public grid as a further electricity source. The inverters used in hybrid systems, which have integrated battery chargers, supply the connected AC loads according to demand from the battery bank of solar energy or the second electricity source. These devices also allow the batteries to be recharged from the extra energy source.

 

Single-phase and three-phase AC hybrid systems

With very large load requirements, AC-coupled ­hybrid systems can provide a sensible alternative to the very effective and cheap to implement DC hybrid systems. This topology is beneficial if the largest part of the loading is required on the AC side (L) during the day. Steca AC hybrid systems can be implemented using the Steca grid and Sinus inverters (B and C).

Single-phase AC hybrid systems

Various generators (A and E) are coupled to the AC bus. In addition, bi-directional Steca Sinus inverters (C) are deployed, which are used for charging the batteries and can also be used for supplying the load if the AC generators (A and E) supply insufficient power. In addition, it is also possible to couple solar generators via a Steca solar charge controller (D) directly to the batteries (H) on the DC side.

If insufficient energy is available in the system to supply the load, a diesel generator (G) can be automatically started, which then supplies the load directly in the AC transfer mode while simultaneously charging the batteries. When the batteries are full, the diesel generator (G) is automatically switched off. The load (L) is then once again supplied directly from the generators (A and E) on the AC side.

If insufficient power is available, the Sinus inverters (C) provide the additionally required power from the batteries. These form and control the AC grid.

If the solar generators (A) or other generators (E) provide excess power on the AC side, the Sinus ­inverters (C) will initially use this to recharge the batteries. If the batteries are full and there is still more power available than is required by the load (L), the Steca Sinus inverters will increase the frequency of the AC grid. The Steca grid inverters (B) then switch off the solar generators (A) one after the other until the energy balance in the overall system is restored. If the load requirement (G) increases, the Steca grid inverters (B) switch on again. This enables large-scale Steca AC hybrid systems to be automatically controlled­.

With very large outputs, this kind of Steca AC hybrid system can also be designed as a three-phase system in order to supply corresponding loads directly. Here the StecaGrid inverters (B) provide direct three-phase feeding on the AC side.

three-phase AC hybrid systems

The required bi-directional Steca Sinus inverters ­Steca Xtender XTH / Steca Xtender XTM (C) can be used in both single-phase and three-phases cases. Up to three devices can be connected in parallel per phase. This means that a total of 24 kW per phase is available, with a maximum of 72 kW in three-phase operation.

Diesel generators (G) can be used to produce up to 100 kW. This enables AC hybrid systems to be implemented with outputs ranging from around 10 kW to several 100 kW.

source : http://www.steca.com