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Hybrid Solar plant at Reverie Language Technologies

The commercial complexes, residences and institutions in BanP_20151101_143557galore city were facing a lot of trouble due to plenty of power cuts by BESCOM during the month of September-October last year (2015). Intermittent power supply was creating lot of damages for the businesses and regular power cuts were costing the businesses dearly.

Reverine Technologies, Software Company located in south-east of Bangalore, was facing the similar problem. Having been affected by the regular power cuts, they wanted a sound and permanent solution so that they could have an un interrupted power supply during the workinP_20151108_110959g hours. At the same time the company did not want to invest heavily on any technology. Moreover the company was working out of a rented premises.

The Company approached us (Hinren Technologies) in December, 2015 to work out a suitable solution using solar energy.

We discussed many options with the customer. A regular grid-tied solar power plant was not the ideal solution since in this set up , inverterP_20151101_164708 will power off when the grid reference stops (Anti-islanding)

It was decided to go for a hybrid system. That is using and optimizing all available sources of power . That is using the Solar power, Grid power and the energy stored in the battery. A hybrid solar generates power in the same way as a typical grid connected solar system but has the ability to store the solar energy generated as well. Loads are served by solar power on priority and excess power will charge the batteries. Fsldurther excess if any gets exported to the grid.In the event of grid shutdown, this system will switch to “off-grid mode” drawing power from solar on priority and switching to battery or a combination of both depending on the demand.

Based on the available technology and current and projected demand, it was decided to install a 5 KW (DC) system on net meterP_20151127_173313ing basis. Since uninterrupted power was critical, it was decided to use 4 nos (12V x 4) of 200 ah deep discharge solar tubular batteries.

A 5 KW system using studer inverted gives an average output of 25 units a day. That is about 750 units a month. The demand was  about 1300 units and projected to about 1600 units. In spite of demand being more than supply, it was decided to go for net metering. The prime driver for this was that during weekends, when the load is almost nil, the plant must be used to its full efficiency. Net metering comes with its own isP_20151108_172706sues with the utility company, but it was worth the trouble.

The office was in the 1 floor of the building and the plant had to be put up on the 6 floor. The structure material had to be lifted using pulley arrangement. The input and the output cables had to be drawn from the first floor. False ceiling in the building made things cumbersome but the team managed it well. Earthing strips had to be drawn from the top of the 6 floor all the way till the new earthing pits exclusively installed for the plant. Three earthing strips had to be from AC, DC and lightning arrester to three exclusive pits shorted through the earth.

The highest point of the structure wP_20151130_154612as about 23 M from the road level. The structure was installed on top of the overhead tank.

The design of the plant was carried out as per IEC and within the framework of the inverter characteristics. The SLD provides more details of the plant .

The critical requirement of the system was to have uninterrupted power . Hence the battery was given last priority to power the loads in case both solar and grid is not available. Swiss make inverter “Studer” was used to optimise and prioritise the input sources.

The battery design and configuration was done just to meet the load requirement in case of absence of both solar and grid power. Even under partial solar availability, the system could optimize between solar and battery. So unlike a typical off grid system where battery autonomy is built for 2 to 3 days, in hybrid case the autonomy was given for just 12 hours.

The system is working very well and we are monitoring the system using remote monitoring solution provided by studer. The system was commissioned on 21 February 2016 . The remote monitoring device was installed on April 07, 2016.

Remarks on the system as on 25 June 2016.

  1. Screen Shot 2016-06-27 at 6.33.52 PM So far the system has generated 2348 units (KWhr)
  2. Monitoring device was installed on 7 April 2016
  3. So the system generation  is 2348 units / 79 days ; that is 29.72 units a day. This translates to 5.9 units per KW per day.
  4. We had estimated a yield of 4.5 to 5 units per KW per day.

The managing director of Reverie Language technologies had this to say about the system

“We have installed a 5KW hybrid solar PV system at our office with net metering. We now get uninterrupted power supply. This is a rather complex but very useful installation. Complex because net metering requires government approvals to be able to sell additional harness to the grid. Also because all sources of power that is solar, Battery and grid have to be well optimised and prioritised. Hinren has not only designed a sound system but also executed a fantastic installation work, and has practically kept us free from all hassles. Sunil and his team are amazing at making the most appropriate recommendations and consider our work as “theirs”. I would highly recommend them “


General Configuration of Rooftop Solar power Plant...


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