United Energy Systems was formed by an energetic team, having a great deal of experience in the Renewable & innovative Energy systems such as Solar Photovoltaic Systems, Solar Thermal Systems, Solar LED Lighting Systems for Industrial, Real Estate, Domestic / Household Sector. Since then United Energy Systems are working with technological leaders in Renewable Energy Sec-tors such as Redren Energy, Vikrom Solar, SMA, Su-Kam.

1. Solar Rooftop PV
System
For
Hospitals
Presented by :
Atul A. Nalawade – Director
United Energy Systems Pvt. Ltd.

2. Sustainability & Sustainable Development can be achieved though “Energy
Efficiency”, “Conservation of Energy” Or “Using Natural Energy Resources
like “SOLAR ENERGY” for producing Energy”………..
Energy is future
OVERVIEW

3. Energy is future
ENERGY EFFICIENCY
Efficiency in Architecture :
 Passive Solar
 Daylighting
 Natural Ventilation
 Evaporative Cooling
Efficiency in Operations :
 Reduce Plug in Loads
 Replace Boilers/furnace with
renewable sources.
HOWEVER MOST OF THE SYSTEMS ARE INCOMPLETE OR
IMPOSSIBLE TO MEASURE . . . . . .

4. Energy is future
INTRODUCING SOLAR PV SYSTEMS
 Hospitals both in urban and rural areas consume a lot
of energy throughout the day as the electrical equipment
used directly or indirectly to treat patients require
uninterrupted power.
 Many hospitals have considerable unused
rooftop space.
 Combined with power shortages and rising cost
of diesel, rooftop solar power makes a compelling
case for implementation in hospitals; there are
several advantages but also several constraints
that need to be considered when deciding on
and designing a rooftop solar power system for
a hospital, such as using a variable source of
power like solar to power equipment used in
life saving situations.

5. Energy is future
Why Rooftop PV Solar ?
 Rooftop solar power can meet up to 20% of a hospital’s electricity requirements.
 If your hospital consumes a lot of diesel for power generation, rooftop solar can
abate up to 20% of your diesel bills, subject to timing of load shedding.
 100 SF of shade-free rooftop space can provide 4 kWh of solar power per day, on
average

6. Cost
Effective
Reliable
Energy
Security
Energy is future
Advantages
Flexible
Configur
ations
Min.
Mainten
ance
 Energy security – Rooftop solar plants can deliver
power during load-shedding, ensuring that critical loads
are always running.
 Cost-effective – Rooftop solar power has a levelised
cost of Rs. 8/kWh (or less), considerably lower than
diesel power at Rs. 18/kWh (or more). Additionally,
your energy cost is now fixed for the next 25 years,
unlike diesel power which keeps increasing.
 Reliable – A solar power plant has no moving parts,
ensuring reliable power over 25 years
 Minimal maintenance – A solar plant requires
very little maintenance from the energy consumer
 Flexible configurations – Solar panels can be installed on different kinds of roofs,
including covered parking areas, as long as the structure can bear the weight of the
panels. They are also highly scalable, with rooftop plants ranging in capacity from less
than 1 kW to more than 1 MW

7. Infirm
Power
Inverter
Weight
Rooftop
Space
Energy is future
Constraints
Inverter
Weight
Rooftop
Space
Rooftop space – The capacity of the solar plant that can be installed in a
hospital may be constrained by lack of sufficient shadow-free rooftop space.
A rule of thumb is that you will need about 100 SF of shade-free roof area
for 1 kW of solar panels. Insufficient roof area will mean that the capacity of
the solar plant on your roof may be sufficient to meet only part of your
electrical load
Load
Shedding
Timings
Daylight
Power
Daylight
Power
Infirm
Power
Load
Shedding
Timings
 Infirm power – Solar power is dependent on the sun
shining, and output varies depending on meteorological
conditions e.g., passing clouds can temporarily reduce the
solar plant’s output.
Therefore solar power for critical equipment should be used
in conjunction with another source of power.
This is a critical part of the design for hospitals, where solar
may be used to power life-saving equipment
 Daylight power – Solar power is only available when the
sun shines. Therefore night time applications will require other
sources of power, or power from batteries charged through solar
Load-shedding timings – If your hospital experiences load
shedding primarily at night, solar power may not help in reducing
your diesel consumption as it is available only during the day.

8. Energy is future
Typical Load
As the rooftop space may not be sufficient to support the entire electrical load of your
facility with solar, it becomes necessary to estimate the different kinds of loads to identify
loads that can be/need to be supported by solar.
Typical electrical loads in a hospital includes :
 Lighting
 Fans
 Refrigeration units
 Air conditioning
 Other electrical equipment
Air conditioning is usually the heaviest load, accounting for more than half the energy
consumed. Air conditioning is not a critical load in many companies; hospitals,
however, may have some air conditioning load, such as in operation theatres or ICUs,
where air conditioning has to run even during load shedding.

9. Energy is future
Our Recommondations
The need for uninterrupted, constant power and
possibly limited roof space necessitates rooftop solar
power being used in conjunction with other sources of
power such as utility power, diesel generator, and/or
batteries.
 Grid Connected Solar PV System

10. Energy is future
Our Recommondations
 Off-Grid Solar PV System

11. Energy is future
Our Recommendations
 Hybrid (Solar + Diesel
Generator) Solar PV System

12. Energy is future
Grid-Tied Solar PV System
As the rooftop space may not be sufficient to support the entire electrical load of your
facility with solar, it becomes necessary to estimate the different kinds of loads to identify
loads that can be/need to be supported by solar.
Typical electrical loads in a hospital includes :
 Lighting
 Fans
 Refrigeration units
 Air conditioning
 Other electrical equipment
Air conditioning is usually the heaviest load, accounting for more than half the energy
consumed. Air conditioning is not a critical load in many companies; hospitals,
however, may have some air conditioning load, such as in operation theatres or ICUs,
where air conditioning has to run even during load shedding.