TECHNICAL SPECIFICATIONS OF 2 KVA POWER CONDITIONING UNIT 1.0 PURPOSE: 1. To charge the battery bank through Solar PV source and AC supply. 2. To invert and produce utility quality sine wave. 3. Inverters will run in Stand By and synchronous mode. 4. To operate connected single phase loads including Computers, Lamps (Florescent / incandescent) and Fans. 5. To transfer the load power form AC to DC and vice-versa in a bump-less mode. 2.0 POWER CONDITIONING UNIT (PCU) Power conditioning unit will be a multi-function device combining the functionality of a gridstand-by solar inverter with a true on-line single/two stage conversion. The required modes of operation would be: Under normal circumstances, solar energy powers the load with the Power Conditioning Unit. The Power Conditioning Unit also charges the battery from Solar. In case of load being greater than the solar power, then the PCU will discharge the power from the battery to a preset condition. Upon availability of AC power and absence of solar power, then the PCU would charge the battery to float levels. The connected loads would see no break in power during the transfer of the unit form one mode to another. The basic system would consist of an integrated built-in Solar Charge controller, Sine-wave Inverter and AC charger. AC & DC DB function shall also be built into this. PCU 2 KVA, 48V DC MPPT/ PWM Solar Charge Controller 1.1 KW 1 No. Sine Wave Inverter - 2000VA - 1 No. AC charger 30 Amp - 1 No. Data Acquisition System - 1 No. System is connected with 1.1 KW Solar PV array, 48V, 300 AH Tubular Battery Bank, 2 KVA load & AC Supply (if available) 3.0 CHARGE CONTROLLER 3.1 Charge controller shall receive power from Solar PV array. This array is a single feed to the solar charge controller and a DC rated MCCB or fuse shall be used for terminating SPV array. 3.2 Charge controller shall be MPPT/PWM based to maximize the SPV array output. A microprocessor based control circuit shall be provided in order to ensure delivery of maximum possible energy to the battery and to prevent overcharging. The charge controller shall be MPPT / PWM type, employing IGBT / MOSFET switching elements. The charging sequence from SPV Array shall be as follows: FROM SPV ARRAY: The battery shall be charged in Bulk mode that is at the maximum rate depending on the solar radiation till the battery terminal voltage is 2.4 volts per cell (adjustable in field). After achieving bulk stage charge controller should work in absorption stage and held battery voltage at maximum point of bulk stage for one hour. After one hour of absorption charge, controller should maintain battery voltage in float mode that should be lower than bulk level. Float to boost should be triggered again when battery voltage fall below a predefined value and after a fixed interval of time depending upon battery state.
SPECIFICATIONS: Switching elements: Type of charger: Input From PV: Output voltage: Protections: Indications: Dielectric Strength: MOSFET / IGBT PWM 48V DC Nominal Suitable for charging 48V DC nominal battery bank Short circuit, Deep discharge, Input Surge Voltage, Over Charge, High Temperature, Reverse Polarity Battery full, Battery Deep discharge, charging through Solar/ AC 2kV between input/output and Ground with EMI protections removed. Forced, with temperature sensitive Fan 4.0 SINE WAVE INVERTER 4.1 GENERAL FEATURES Inverters should be of very high quality having efficiency and of microprocessor / micro controller / DSP controlled type. The wave form should be pure sine-wave. The inverter shall be capable of monitoring its own parameters. The inverter should be completely compatible with the charge controller, grid charger and other system components. Sine-wave Inverter shall comply with the following: PCU should be able to operate continuously at full load condition for 10 hrs/ day. For DC to AC energy conversion MOSFET / IGBT devices shall be used. Inverter shall be designed for continuous, reliable and efficient operation as specified. Have high conversion efficiency from 25% to full load. The conversion efficiency at 25% of full load shall not be less than 80%. Full load efficiency should be more than 85%. Inverter shall have high overload capability; the overload capability of the inverter shall be a minimum of 150% at rated full load for 1 Min and 200% of full rated output for 10 seconds. During overload conditions, the inverter shall be capable of maintaining the rated voltage and frequency as per specifications. The supplier should specify the overload capacity in the bid. Inverter shall have automatic restart facility after overload Triggered shutdown. Restart shall happen after the removal of fault and resetting. Similarly after under voltage condition. Output voltage of the inverter shall be sinusoidal with harmonic distortion less than 5% THD. PCU must automatically ensure charge level of battery from solar or AC as per battery charge level and power availability The dimension, weight, mounting details etc. of the inverter shall be clearly indicated in the detailed technical specification and the same should be submitted along with the bid.
4.2 PROTECTION & SAFETY The inverter shall be robust, reliable and shall offer all the safety and protections features stated in the document. Both AC & DC lines shall have suitable fuses and protections to allow safe start up and shut down of the system. Fuses used in the DC circuit should be DC rated. Inverter output shall be protected against Inverter overload, surge current protection, High Temperature, Over/under voltage and over/under frequency. The inverter shall have provision for input and output isolation (automatic and manual). TECHNICAL SPECIFICATION Rating: AC Input Voltage: AC Input Frequency: DC Input voltage: Output Wave form: Output Regulation: Output Frequency: 2000VA 230V+10% /- 30% (AC charging current should at least be10 Amp at low threshold) Forced, with temperature sensitive Fan 50Hz ± 3 Hz 48 V DC Nominal Sine wave with Less than 5% of THD Maximum 5% against input voltage and load variation 50 Hz ± 0.5 Hz variation Output voltage: 230V AC - ± 2% Rating: No load Consumption: Overload capacity: Power Transfer: Dielectric strength: Short -circuit protection: Battery low voltage: 2000VA 2.5% of total output rating. (Sleep Function Required) 150% for 1 Minutes and 200% for 10 Second From AC to Battery or Vice-versa to be bumpless. Loads to see no break in power 2kV between input / output with Ground with EMI protections and 1.5kV between input and output Circuit breaker cum electronic control Auto shutdown at 1.85 V / Cell, 5.5V/ monoblock Load high voltage: Auto reset shutdown when 10% of Nominal output voltage is exceeded. High battery voltage : AC over current : Indication: Operating Temperature: Enclosure Protection: IP 20 Auto shutdown Auto shutdown LED/ LCD Based for Output OK / System Fault and overload Battery Deep discharge, Battery Over charge, charging on Fan Forced 0 Degree to +55 Degree Operating humidity: 95% non condensing
5.0 DATA ACQUISITION SYSTEM The PCU should have provision for monitoring interface thorough a front end communication port /USB/any other technology. The communication interface should facilitate monitoring of all the parameters of inverter and charge controller on local computer available at site. The data logs of the system should be convertible to MS Excel worksheet. The interface software should be windows based and compatible with regular Microsoft applications. The software if required should be supplied without any extra cost. 6.0 INSPECTION/TESTING: REIL or their nominated representative reserves the right to inspect/testing of items before dispatch to site and the quality/progress of job at site. Any alterations/modification required at the site shall be implemented. Vendor shall furnish a detailed schedule of activities. 7.0 CODES AND STANDARDS: The following codes and standards are applicable for the equipment to be supplied: 1. IEEE 519 1981 guide for harmonic control and reactive compensation of static power controllers are equivalent BIS standard. 2. National Electrical Safety code ANSI C2-1990 (USA) or equivalent BIS code. 3. National Electrical NEPA-70-1990 (USA) or equivalent national BIS code. Note:- All Technical Data must be as per Technical Data sheet provided in Tender and Additional requirements confirmed during sample evaluation as per detail enclosed.
Annexure - I 2 KVA UNIT In addition to tender specification & technical data sheet confirmed by supplier, the PCU should also confirm the following as specified during sample evaluation : 1) Supplier name should only be put on the name plate. It should not be on LCD display or other place. REIL name and logo to be put on LCD and data logging software home page. 2) Data logging software CD and data cable should be provided with each unit. 3) Unique Sr no. should be put on each PCU. 4) Temperature sensitive cooling fan to be provided in the unit. 5) Output voltage : 230V + 2% under all variations in I/P voltage and load. 6) The unit should comply to following IEC standards : Efficiency measurements : IEC 61683 Environmental : IEC 60068 2 (6,21,27,30,75,78) Design qualification (Charge Controller) : IEC 62093 7) LED indications should be as per following: Overload : Red LED Inverter ON : Green LED Battery Low : Yellow LED Solar Charging : Green LED Charged : Green LED DC High Voltagc : Red LED Grid charging : Green LED System fault : Blinking LED s 8) Data Acquisition System : Following Parameters should be available on LCD and same should also be stored in internal memory (with one hour interval for 15 days): 1. Date & Time 2. PV Voltage 3. PV Current 4. PV Power 5. Inverter O/p Voltage 6. Output Current 7. Output Power 8. Solar Accumulated K wh 9. Grid Voltage 9) Terminals should be provided instead of socket for AC output. 10) Terminal quality to be improved for I/p side.