IEEE Electrification Magazine - June 2016 - 16

(a)

(b)

Figure 6. Bhomji ka Gaon, Rajasthan. (a) A 125-Wp solar panel installed on a house, and (b) a family in a home with a solar-dc inverterless system.
(Photos taken with permission of the family that owns the system.)

Economics of On-Grid
Homes with Load Shedding
Now, let us analyze grid-connected
homes and understand the impact of
load shedding on power costs in the
two types of homes. Table 6 presents
cost per day when the grid has a load
shedding of 4 h (2 h during sun hours
and 2 h during off-sun hours). The per
day cost for a dc home is as low as ₹7.3
even with 4-h power cuts, whereas the
ac home power cost is about four times
Figure 7. The power data measured over a day in an off-grid home in Rajasthan with a solarthis cost. This translates to cost savings
dc inverterless system on 25 February 2016.
of about ₹650 per month.
These cost savings become even
more prominent as the duration of
battery to drive a dc fan, a dc tubelight, a dc bulb, and a
load shedding increases as is evident from Figure 8. So
socket-cum dc mobile charger as shown in Figure 6(a)
for homes that have a grid supply only for a few hours a
and (b). The power is remotely monitored with power
day as is the case with thousands of rural homes in
data logged onto a server using Bluetooth and a mobile
India, solar-dc power becomes an efficient and more
handset. Figure 7 presents the solar power, the power
importantly an affordable solution. Also shown in Figflowing in and out of a battery, and the load for one
ure 8 is the power cost per day in an ac home but with
such home on 25 February 2016. The captured data
energy-efficient ac-powered dc appliances, consuming
from homes validate the simulation results presented
15% more power than dc-powered dc appliances. Here
for a dc home in Table 5. The deployments have, on one
too, the costs are considerably lower than those for a
hand, marked the arrival of power to these homes,
conventional ac home with ac appliances; however,
which otherwise would have continued to be without
they are 10%-60% higher than that of a dc home,
electricity for a considerable period of time and, on the
depending upon the extent of load shedding. There is
other hand, established that the future of power is
no reason to go halfway; going with solar-dc power will
solar-dc power.
be the fastest way for India to get to 24/7 power in every
home. These lessons were used to pilot solar-dc power for
grid-connected homes with significant load shedding. A
TABLE 6. Per-day cost of power in ac and dc
solar-dc inverterless system powering a cluster of 27
homes with a grid and 4-h load shedding.
homes and a school was set up in the village of Tirmal,
Odisha, whose entire population is below the poverty line.
Type of
Load/Day
Cost/Per
Efficiency
Home
(W H)
Day (₹)
(%)
Figure 9(a)-(c) shows these deployments. Figure 10 captures (via Bluetooth and a mobile phone) the solar power
ac home
3,266.00
28.9
88
generated, the load, the grid power used, and the power
dc home
1,212.00
7.3
93.3
in/out of a battery in a home for a few days. This data

16

I E E E E l e c t r i f i c ati o n M agaz ine / j un E 2016



Table of Contents for the Digital Edition of IEEE Electrification Magazine - June 2016

IEEE Electrification Magazine - June 2016 - Cover1
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IEEE Electrification Magazine - June 2016 - 1
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IEEE Electrification Magazine - June 2016 - Cover3
IEEE Electrification Magazine - June 2016 - Cover4
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