Question

1a) Carry out a baseline energy audit to come up with an appliance power matrix of your household
giving the type of appliances, quantity and power rating of appliances that can be powered by a
solar system.
b) Estimate appliance usage times in a calendar day (diurnal) to come up with an appliance time of
use scheduling matrix for your household.
c) Calculate the daily load (kWh) and peak power (kW) required and plot the load profile of your
household.
d) Hence or otherwise design a Stand-alone semi integrated PV system using PV Syst that aims to
meet the daily energy requirements for your home. You may use site dependent detailed losses,
horizon shadings and economic parameters of your choice. Clearly state all assumptions.
e) Use the software HOMER to carry out optimal sizing (based on least cost of energy) of a hybrid
renewable energy system comprising of a solar PV array, a diesel generator, storage battery, inverter
and AC & DC load for your home. NB: Use prevailing country specific economic parameters and
discount rates. Make logical assumptions where necessary.
f) Comment and contrast your results of part d and e

Answer 1

Here is the baseline energy audit with an appliance power matrix of my household that can be power by a solar system:

TYPE OF APPLIANCE	QUANTITY	POWER RATING OF APPLIANCE
CFL LAMPS	5	11 Watts
	2	8 Watts
LED LAMPS	6	4 Watts
Tube lights	8	40 Watts (plus 15 watts ballast loss)
Air Conditioner (Split-type)	2	1.5 Tons
Ceiling Fans	4	60 Watts
Exhaust Fans	2	40 Watts
LED TV	1	60 Watts
Microwave Oven	1	1000 Watts
Refrigerator 165 Litre	1	100 Watts
Washing Machine (6.5 Litres)	1	325 Watts
Desktop Computer	1	80 Watts
Mixer Grinder	1	750 Watts
Electric Iron	1	750 Watts
Water Pump (1 HP)	1	746 Watts
Mobile Charger	6	5 Watts
Induction Oven	1	1100 Watts
Music Player	1	60 Watts

Estimation of appliance usage times in a calendar day:

Appliances	Quantity used per day (average basis)	Wattage	Usage time per day (approx)	Daily Energy Consumption in units (i.e. kWh) for each	Total Energy Consumption in units (i.e. kWh)
CFL LAMPS	3	11 Watts	4 Hours	0.05	0.15
	2	8 Watts	8 Hours	0.066	0.132
LED LAMPS	4	4 Watts	8 Hours	0.033	0.132
Tube lights	4	40 Watts (plus 15 watts ballast loss)	6 Hours	0.4	1.6
Air Conditioner (Split-type)	2	1.5 Tons	3 hours	6	12
Ceiling Fans	2	60 Watts	12 Hours	2	4
Exhaust Fans	1	40 Watts	4 Hours	0.25	0.25
LED TV	1	60 Watts	4 Hours	0.8	0.8
Microwave Oven	1	1000 Watts	1 hour	1	1
Refrigerator 165 Litre	1	100 Watts	24 Hours	2	2
Washing Machine (6.5 Litres)	1	325 Watts	1 Hour	1.5	1.5
Desktop Computer	1	80 Watts	4 Hours	0.8	0.8
Mixer Grinder	1	750 Watts	20 Min	0.2	0.2
Electric Iron	1	750 Watts	15 Min	0.33	0.33
Water Pump (1 HP)	1	746 Watts	30 Min	0.35	0.35
Mobile Charger	4	5 Watts	2 Hours	0.0333	0.132
Induction Oven	1	1100 Watts	30 Min	1.1	1.1
Music Player	1	60 Watts	40 min	0.25	0.25

Daily Energy Consumption (kWh)= 26.728 units