1. Presentation On Solar
Installation Project
Surya Power Eco Solution Pvt. Ltd
Nagpokhari, Kathmandu, Nepal
Tel: +977-4413467&4420326

2. Block Diagram Of Overall System

3. Designing & Estimation
Quantity Watts Total watts HRS/day Total WH/day
Printer 1 1600 1600 4 6400
Kitchen CFL 4 10 40 4 160
Projector 1 350 350 4 350
Laptop 22 65 2420 6 8580
Screen 20 100 2000 3 6000
U tube light 31 40 1240 6 7440
Television 1 90 90 6 540
Samsung tv 1 125 125 6 750

4. For the devices mentioned I above table, the total daily energy requirement is given by
E(wh) = 31270
Selection of Solar PV Panel
System Voltage = 96
Energy (AH) = E(Wh) / system voltage
=31270/96
= 325 Ah
The current to be generated by solar array is given by,
Iarray =
Total average daily load in Ah @ system voltage
(
𝑝𝑒𝑎𝑘 𝑠𝑢𝑛
∗
𝑑𝑒𝑡𝑒𝑟𝑎𝑡𝑖𝑛𝑔 𝑓𝑎𝑐𝑡𝑜𝑟
∗
𝑐𝑜𝑙𝑢𝑚𝑏𝑖𝑐 𝑒𝑓𝑓𝑖𝑐𝑖𝑒𝑛𝑐𝑦
)
=
325
5.5∗0.9∗0.95
= 69.26 A

5. The number of modules to be connected in parallel can be sound by using the following formula :
Np =
𝐼 𝑎𝑟𝑟𝑎𝑦
𝐼 𝑚𝑝
; Imp = current from solar module at maximum power
Np =
6
.
26
5
.
43
= 12.75 = 12
We take Np = 12
The next step is to be determined the number of module to be connected in series to obtain
desired system voltage . This number is found by using the following formula:
Ns =
𝑛𝑜𝑚𝑖𝑛𝑎𝑙 𝑠𝑦𝑠𝑡𝑒𝑚 𝑣𝑜𝑙𝑡𝑎𝑔𝑒
𝑛𝑜𝑚𝑖𝑛𝑎𝑙 𝑚𝑜𝑑𝑢𝑙𝑒 𝑣𝑜𝑙𝑡𝑎𝑔𝑒
=
96
24
= 4
The total number of module required to deliver the daily average energy (in Ah) at the system
voltage is:
Nt = Np * Ns
= 12*4 = 48

6. Sizing of Storage Battery
Required capacity of the battery bank in Ampere-hour,
C =
𝐸 𝐴ℎ ∗𝑁𝑎
ℇ∗𝐷𝑂𝐷
=
325 ∗2
0.85 ∗0.8
= 955.88 Ah
Where,
E = daily energy consumption (Ah)
ℇ = battery charging efficiency ( normally 0.8 to 0.95 )
Na = number of days to be operated without sunshine (Autonomy Days)
DOD = Depth of Discharge
Number of batteries in series = 8
Number of batteries in parallel = 4
Total number of batteries = 32

7. Hybrid Charger and inverter:
Rating = 2.5KVA @48V and another of 7.5 KVA@ 96V with MPPT type charge controller
This above two inverter is used for two different purposes. One for high rating equipment
and another for low rating equipment.

8. For The Grid Independent:
The total number of module required to deliver the daily average energy (in Ah) at the system voltage is:
Nt = Np * Ns
= 12*4 = 48
Number of batteries in series = 8
Number of batteries in parallel = 4
Total number of batteries = 32
Rating = 2.5KVA @48V and another of 7.5 KVA@ 96V with MPPT type charge controller
This above two inverter is used for two different purposes. One for high rating equipment and another
for low rating equipment.
The total cost for the system will be Rs.28,96,750.

9. NEA Grid independent Solar System

10. For the grid dependent:
The total number of module required to deliver the daily average energy (in Ah) at the system voltage is:
Nt = Np * Ns
= 12*2 = 24
Number of batteries in series = 8
Number of batteries in parallel = 2
Total number of batteries = 16
Rating = 2.5KVA @48V and another of 7.5 KVA@ 96V with MPPT type charge controller
This above two inverter is used for two different purposes. One for high rating equipment and another for
low rating equipment.
The total cost for the system will be Rs.17,44,750.

11. NEA Grid dependent Solar System