DB Power has been involved in solar energy since 1992, pioneering solar grid interactive power conditioning units. They are an OEM supplier in India with the largest presence and have developed PCUs ranging from 1kW to 30kW. Their product range includes solar charge controllers and bi-directional inverters that allow solar power to charge batteries and feed into the grid. Key installations include over 1200 PCUs installed over the past 5 years in India and other countries under varying conditions.

1. DB POWER IN SOLAR ENERGY

2. BRIEF
• SOLAR Energy Business foray since 1992.
• Pioneers in developing Solar Grid Interactive PCU
(1996) in collaboration with CEL (Govt. of India PSU).
• OE Supplier to TATA BP Solar, India.
• Developed PCU ranging from 1kW to 30kW and in
multiples of 30kW.
• One of the largest presence in India

3. Principal of Operation
+ve
+ve
-ve
Power -ve
Conditioning
Unit +ve
+ve
-ve
-ve
+ve
Feed In
-ve

4. Bi-Directional Solar PCU/GCI
Product Range:
• 1 to 6 kW with 230V 1Ph Output
• 10 to 30 kW with 400V 3Ph Output
• Solar Charge Controller 48V/100Amps
Specifications :
• Array Input – 40 to 88V DC for 1,2 & 3kW
– 80 to 176V DC for 4,5 & 6kW
– 100 to 220V DC for 10kW
– 200 to 440V DC for 20 &30kW
• Efficiency – 90% or better up to 6kW
- 92 % or better Above 6kW

5. Block Schematic – Solar PCU
KM 2
Grid
Input
Solar
Panel MPPT Bi-directional
Charger Inverter Isolation
Transformer
KM 1
Load
Battery
Description :
• The Solar Panel will charge to Battery and support to the Inverter.
• Battery will support to load, incase of Solar Power is weak or not available.
• The battery can also be charged through Grid.

6. Block Schematic – Solar GCI
Combiner Grid Connect Inverter
Inverter Isolation
Transformer
Solar K1 K2
Panels To Grid
(optional)
Description :
• The Solar Power available through Array is converted into AC and fed to the
Grid.
• The combiner is optionally available to connect multiple Solar Arrays.

7. Features
 Sate of the art PWM Technology
- High efficiency Inverter design with DSP Control
- High speed MPPT optimized for better control over a range.
- High system efficiency, optimized by proper selection of Devices,
switching frequency and operating DC voltage.
- Soft start mechanism to avoid high in rush current on array
 Powerful data logging features which includes onboard logging of
different parameters such as input, output & battery. (On board logging for
7 days if logged, for every 1 hour)
 48, 96,120 and 240 V battery operated systems as well as battery
less systems i.e. Grid Connected Interactive (GCI)

8. Features ……..
 Multiprocessor based modular design. Separate processor for
Charger, Inverter and Data logger. Complete digital control, to
have more flexibility and easy upgradeability.
 Customized Charger ratings for same inverter ratings. (e.g. for
10KW Inverter, customized charger ratings of 14KW, 20KW, 22KW can be offered to
reduce overall price)
 In house and Indigenous; High Reliability and Field Proven
Design.
 Paralleling option with DG available, to enhance power
requirement. (By sensing load requirements, DG is automatically turned on and
used to feed load in parallel with PCU)

9. Installations :
- 15 kW grid interactive PCUs supplied to TEDA for feeding power to wind grid
(1994)
- 45 units of 4 kW installed in Thailand for wind powered grid feed system. 15 Units
work in parallel for making each phase making it a 3 phase system. (2005)
- More than 100 units supplied to Sri Lanka for educational institutions (2005)
- More than 100 units supplied for banking applications (2007)
- More than 200 units supplied to Hindustan Petroleum Corp. Ltd. (HPCL) for petrol
pump utilities. (2008)
Total installed Power : More than 1200 PCUs of various range
installed over past 5 years under varying ambient conditions.

10. Full System Support
• DB Power – design and development of
customized PCU / key responsibilities.
Panel • Panel Manufacturer – Supplies & support
Manufacturer
towards Project.
Architect DB Integrator • Integrator – Installation, commissioning &
support for total Solar Project.
Customer
• Architect – Aesthetical integration of Solar
Systems for land / buildings (Building
BIPVs integrated photovoltaic systems).
Hybrid

11. Developments Under Progress
 Systems for higher ingress protection ratings, suitable for
indoor as well as outdoor installation. (IP41 and NEMA R3
enclosure standard)
 Transformer Less systems with higher efficiency and lower
weights
 More connectivity options such as RJ45 interface as a
default,RS485,Modbus,modem etc.
 Standard 30 kVA system developed for large solar farms.
 Paralleling multiple systems for a Hybrid Power Plant
 250 kVA Solar Power plant for very large installations

12. Achievements – Key Installations
CREDA : 2kW, 200 Nos
Ladakh : 36 kW
Lonavala :100 kW Sagar Islands : 40 kW Thailand : 400 kW

13. Suitable for : Application Diversity

14. Thank You !
milind.arbatti@dbups.co.in
www.dbups.com