Sterling On-Line UPS systems are manufactured with latest and proven technology that suits Indian conditions. These are IGBT based high frequency systems that use crystal oscillator for frequency stability. The UPS systems are generator compatible and can charge batteries from 7.2 Ah to 150 Ah for longer backup.

Some of the features of the range we offer include:

Features

• High efficiency
• Sine wave output
• Soft start output
• True on-line system
• Static transfer switch (optional)
• Very high reliability
• Cold start capability
• Highly stable output voltage
• High frequency PWM technology
• Battery and load level bar display
• Crystal controlled output frequency

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We offer line interactive Off Line UPS Systems as economical power back up solution for computers and associated systems, against power black out, fluctuations, brown out, spikes & surges. These are available with high capacity charger for charging batteries of rating up to 150 Ah that are used for achieving backup up to 8 Hrs.


Features:

• MOSFET Based PWM Technology
• Wide Range in built Automatic Voltage Regulator
• Intelligent CVCC Charger for prolonged battery life
• Option of heavy-duty charger for high capacity batteries
• User friendly indications for mode of operation & fault status
• Generator Compatible

Technical Specifications:
Rating	500 VA to 3.0 KVA
Battery Voltage	12 V to 60 V
Input Voltage	170 – 270 V*
Input frequency	50 Hz +/- 6%
Output Voltage	220 V +/- 10%
Automatic Voltage Regulator	Integral
Output waveform	PWM Quasi-square wave
Transfer Time (typical)	< 4 m sec

* Other ranges on request

We offer very highly reliable Inverters that have proven their reliability over the years. These inverters are specially designed for Indian climatic & handling conditions. They serve dual purpose of UPS & Inverter. This eliminates the need of a UPS for domestic purposes. The UPS / Inverter mode can be selected by the user at any time.


Features

• Proven Micro Controller- PWM technology
• User selectable UPS / Inverter mode of operation
• User selectable Low / High rate of Battery Charging
• Intelligent heavy duty Charger for prolonged battery life
• Electronic overload protection with smart auto reset
• User friendly indications for modes of operation & fault status

Technical Specifications

• Rating 500 VA to 3.0 KVA
• Battery Voltage 12V to 60V
• Output Voltage (Nominal)220V
• Input Voltage 140– 270 V
• Input frequency 50 Hz +/- 6%
• Battery Charging capacity Up to 200 Ah
• Output waveform PWM Quasi- square wave

We manufacture Inverters, which are meant to be used with solar panels. These have intelligent controller that permits charging both from Solar panel as well as from mains supply. When the solar power is available, the batteries are charged from solar power and when batteries are in discharged state and sufficient power from solar panel is not available, the batteries get charged from mains supply. User-friendly indicators on the front panel indicate the source from which the batteries are being charged.

Features & Specifications:

• Sterling solar inverters have all the features of Sterling Digital Inverters in addition to the features mentioned above.

Sterling sine wave Home UPS systems are the ultimate power backup systems. They serve dual purpose of UPS & Inverter. The UPS / Inverter mode can be selected by the user at any time. They employ tested & proven Micro Controller based DSP technology for conversion and control of output voltage that is pure Sine wave and very well regulated. Precisely controlled battery charging parameters help in enhancing battery life and in reducing power consumption.

Features

• Pure sine wave output from no load to full load
• Noiseless operation of fans, tubes and appliances
• No excessive heating of motors of appliances like Food processors, mixers and juicers etc.
• SMPS charger for fast charging & energy saving
• Wide input voltage range (120 – 270 V) for battery charging
• Electronic overload protection with auto reset
• User-friendly indications and audio alarm

Sterling Servo Stabilizers are available for industrial, office & domestic applications. These are designed for precise control of output voltage (Typically +/- 1%) that significantly increases life of appliances and machines as well as reduces breakdowns & maintenance.

Technical Specifications:
Rating (KVA)	Single Phase Systems	1 KVA-15 KVA
	Three Phase Systems	3 KVA-100 KVA
Input Voltage Range	Single Phase Systems	170-270V, 140-270V, 110-300V,(Other ranges on request)
	Three Phase Systems	300-470V, 240-470V, 190-510V, (Other ranges on request)
Type	Unbalanced Input Voltage & Load, Balanced Input Voltage & Load
Input Frequency	50 Hz+/- 6%
Output Voltage	Single Phase Systems	220/230/240 V*+/- 1 %
	Three Phase Systems	380/400/415 V*+/-1 %
Regulation	+/-1% for Input Voltage variation within the range & for Load variation
Protections(Optional)	MCB on Input / Output
	Output high/Low voltage cutoff with auto recovery
Indications	Mains ON
	Output Voltage Low
	Output Voltage High
Metering	Voltmeters with Selector Switch on all Phases to indicate Input/output Phase Voltage

* Other ranges on request

Precision Electroplating Rectifiers are designed to provide Precisely controlled DC output for highly consistent Electroplating. The output voltage and output current (in CVC & CCC systems respectively) remain highly stabilized against AC Input Voltage variation from 170-270V and variation in job sizes. The system employs phase control technique using SCR's for control of output parameters.

Technical Specifications:
A C Input Voltage	170-270V , +/- 10%. 1 Phase
Input Frequency	50 Hz +/- 6%
D C Output Voltage	6V to 100V
D C Output Current	10 Amp to 100 Amp
Output Ripple (rms)	Less than 5%
PROTECTIONS
Mains short-circuit	A C Fuse/MCB
Accidental Output Short Circuit	Auto Resetting Electronic Shut Down
Indications	Mains On
	Voltage Control
	Current Control
Metering	Digital Voltmeter for Output Voltage
	Digital Ammeter for Output Current
Temperature	0-45 deg. C max.
Relative Humidity	90% max.(Non Condensing)
Installation	INDOOR

Salient Features:


• Regulated output voltage & current
• Auto resetting electronic short circuit protection on output
• Low ripple in output
• Digital meters for easy readings of voltage & current
• Easy to handle controls

Optional

• Ampere Hour / Ampere minute counters

We manufacture Battery Chargers of various types for different applications, such as automotive & generator batteries, power house & sub station batteries, fork lifts, golf trolleys & elevator power back-up batteries etc.

The different types of chargers that we manufacture are:

• Float Charger
• Boost and Float Charger
• Boost cum Float Charger

Technical Specifications:
AC Input	180 - 270 V, 50Hz. +/- 6%, 1 Phase
DC Output Voltage	Boost up-to 2.7V/cell +/- 1%
	Trickle at 2.25V/cell +/- 1%
DC Output Current	2A to 50A
Protections	Mains short-circuit by Fuse/ MCB
	Charger over load by Current Limiting
	Battery reverse Connection (optional)
Indications	Mains Charged
	On Battery
	Charging Battery
	Battery Reverse (optional)
Cabinet	Table Top Type

* other ratings on request

Salient Features:

• Complete isolation between AC Input & DC Output
• Battery Reverse Protection
• Protection against short circuit on charger terminals
• Constant current charging from 180-270V input and from fully discharged battery to final charging level
• Automatic change over to trickle mode after the battery voltage reaches Normal Charge level