Standalone DC-AC/AC Inverter With With Internal Automatic Bypass

Low power requirements usually mean the installation of a standalone inverter together with a Manual ByPass. The main inconvenient is of course that in case of inverter failure, your load is down during the time it takes to access the site and engage the By-Pass!

The TSI BRAVO ST will bring the securitization of your critical load’s power to the next generation!

Hot-swappable Inverter with automatic by-pass

  •  Hot-swappable inverter module requiring only seconds to be replaced
  • Automatic by-pass engagement in case of inverter failure
  • TSI CE+T BRAVO INVERTERSwitching back to inverter automatically when the
    system is ready

Output Power Options

  • Standalone model 5000VA
  • Standalone model 2500VA, with redundancy
  • Standalone model 2500 VA, without redundancy

BRAVO – ST is a compact inverter with automated by-pass solution providing a pure sine wave AC supply. In conjunction with a DC Power system, it provides an excellent AC backup solution. It uses the latest inverter technology, providing superior energy efficiency in a compact size.

The “Twin Sine Inverter” (TSI) technology allow 3 operations mode (EPC double conversion AC to AC, ONLINE DC to AC from battery and o line by-pass to AC). The automatic bypass to AC allow easy hot plug module replacement without stopping the load giving highest AC output availability and avoid the need of an external manual by-pass.


  • Power Stations
  • Transformation and Distribution Substations
  • Manufacturing Processes
  • Oil & Gas Production Facilities

All business critical applications and all types of AC loads. The solution is design for highest AC output availability. Both inverter modules and by-pass are hot-swappable which ensures low Mean Time to Repair (MTTR), reduction in service costs

Detailed Views

Inverter - Bravo - Communications 2U - Inversor comunicaciones

Inverter - Bravo - Communications 2U - Inversor comunicaciones 2 TCIP alarms


Input voltage VAC range150-265 VAC
Input voltage VDC range24 , 48 , 60, 110 , 220 VDC
Output Voltage230 V / 220V / 240 Vac adjustable (default 230 Vac – 50 Hz)
Cooling / IsolationForced / Doubled
Alarms output / supervisionDry contacts on shelf / Standard USB port and MODBUS on T2S, optional : Candis Display / Candis TCP-IP
Remote on / offon rear terminal of the shelf via T2S


Model Input Range VDCInput Range VACOutput VACPower VA
ST-24 / 23019 – 35 VDC150-265VAC230VAC1500VA/3000VA
ST-48 / 23040-60 VDC150-265VAC230VAC2500VA/5000VA
ST-110 / 23090 – 160 VDC150-265VAC230VAC2500VA/5000VA
ST-220 / 230170 – 300 VDC150-265VAC230VAC2500VA/5000VA


On-line Mode

DC is the primary source of supply whilst Mains (AC) works as the secondary source of supply. Switching time between DC input and AC input is 0ms (source transfer).The power delivered by the DC source (usually a battery , but it could be any other type of DC generator) is converted to provide regulated and transient free power to the load. In case of short circuit at the load side, the boost is automatically, timely and energized for a specific duration to trip downstream protective devices.

Safe Mode

Safe mode uses DC as primary source of supply while Mains (AC) is in standby. Mains (AC) is normally disconnected through internal inlet relay and is only connected when down stream clearance is required (boost) or if DC is unavailable.

The transfer between DC and AC results in typical transfer time of 10ms. Typically the safe mode is used in extremely harshed environments such as railways. Under such conditions it provides extra isolation against disturbances carried by the Mains.


Mains input (AC) is the primary source whilst DC works as backup.

The TSI is designed to operate on Mains on permanent basis and to deliver output voltage conditioned with low THD. There is no physical difference on the output sine wave whether the source is AC (or) DC. If the Mains is out of tolerance or goes down, the converter seamlessly switches to DC and the converter operates in “Back-up mode” (Switching time back and forth is 0 ms). As soon as the Mains returns in to valid range, the EPC mode is automatically resumed.

The EPC mode offers higher efficiency (up to 96% depending on the model) without compromising the purity of the output sine wave.

Mix Mode & Walk-in-mode

Under some circumstances DC and AC source can be combined. The sequence is defined by a user selectable set of parameters start, control and exit are fully automatic. A specific example of Mix-mode is the Walk-in mode where the transfer from DC source to AC source is ramped up within a fix and adjustable period of time.

Setting for Walk -in -Mode and Mix Mode can be made through the T2S supervisor configuration file.

By Pass Mode

The automatic by pass is engaged in case of following condition

  • AC input is present and 1 BRAVO TSI Module failure if no redundancy configured OR only one module installed OR
  • AC input is present and 2 BRAVO TSI module failure if one module redundant has been configured.

The automatic by pass IS NOT AVAILABLE if:

  • No AC Input is present
  • AC output LOAD exceed 5kVA

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