Information required:
Load =?
Backup time =?
Connection type = single phase or three phase?
Lets say my backup time requirement is 2 hours Then battery capacity (Ah) can be calculated using the following formula
Ah = (Total Load x Backup hours)/(DOD x P.F x SV)
Where
Now my battery bank will consist of 8 batteries having 200Ah @ 48V capacity each.
a) No. of solar panels for running the load directly through solar grid.
Load = 5kW
No. of panels = 5kW x 1.4 --> 7 kW --> 7/235Wp = 30 panels (235 Wp each)
Peak solar hours in worst month of the year = 4 hours (considering the design is for Lahore Pakistan)
so solar PV grid will suport the 5kW load for 4 hours a day. Before and after these four hours, the solar PV grid will give low yield. This low yield will then be compansated by Battery bank and public grid.
b) No. of solar panels for charging the battery bank
400 Ah @ 48V battery bank acts as a 1kW load for solar grid and public grid. (real time observation)
So for a 1kW load we would need 1000 x 1.4 = 1400Wp of panels
No. of panels = 1400/235 = 6 panels
c) Total no. of solar panels
36 + 6 = 42 panels
For choosing the inverters we need to know about following specs of the inverters from its data sheet
SMC 9000 TL (Solar Inverter)
SI 5048 x 2 (Grid Inverter)
You may also visit
Circuit Diagram for 5kW Off-Grid Solar PV System
5kW Off-Grid Solar PV System Design
Load =?
Backup time =?
Connection type = single phase or three phase?
Design steps:
Step 1
How to decide the battery bank?Lets say my backup time requirement is 2 hours Then battery capacity (Ah) can be calculated using the following formula
Ah = (Total Load x Backup hours)/(DOD x P.F x SV)
Where
- DOD - Depth of discharge
- P.F - Power factor
- SV - System voltage
So
Ah = (5000 x 2)/(0.6 x 0.8 x 48) = 434.02 Ah approximately equal to 400AhNow my battery bank will consist of 8 batteries having 200Ah @ 48V capacity each.
Step 2
How to decide quantity of solar panels?a) No. of solar panels for running the load directly through solar grid.
Load = 5kW
No. of panels = 5kW x 1.4 --> 7 kW --> 7/235Wp = 30 panels (235 Wp each)
Peak solar hours in worst month of the year = 4 hours (considering the design is for Lahore Pakistan)
so solar PV grid will suport the 5kW load for 4 hours a day. Before and after these four hours, the solar PV grid will give low yield. This low yield will then be compansated by Battery bank and public grid.
b) No. of solar panels for charging the battery bank
400 Ah @ 48V battery bank acts as a 1kW load for solar grid and public grid. (real time observation)
So for a 1kW load we would need 1000 x 1.4 = 1400Wp of panels
No. of panels = 1400/235 = 6 panels
c) Total no. of solar panels
36 + 6 = 42 panels
Step 3
How to choose the inverters?For choosing the inverters we need to know about following specs of the inverters from its data sheet
- Maximum output power
- Maximum input DC voltage
- Maximum input DC current
- Maximum input Power
SMC 9000 TL (Solar Inverter)
SI 5048 x 2 (Grid Inverter)
You may also visit
Circuit Diagram for 5kW Off-Grid Solar PV System
5kW Off-Grid Solar PV System Design
3 comments:
Solar energy is been seen as the future power source which will lighten up our new world.
SMA Inverters
Exactly, there are number of projects which are in process to lighten up the world. like our page for keeping yourself updated from solar pv technology wonders www.facebook.com/ODSolar.
This is a good informative blog, which is self-explanatory, however, I know a good solar panel manufacturing company from Delhi.
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