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Help regarding application of solar in conv. electric ckt

by pavis1313
Tags: application, conv, electric, solar, urgent
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Mar17-13, 01:35 AM
P: 3
hi there engg/experts

I am having a project of applying 5 Kw photovoltaic along with conventional electric supply.
The photovoltaic panel would be able to run 35-40 fans and cfls.
The problem which i am facing is to club both the supplies together on the the same circuit without making much changes in the original electric circuit so as to reduce the costing of this project.
eagerly waitng for your reply...............
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Mar17-13, 03:15 AM
PF Gold
P: 1,909
pavis1313, Welcome here to Physics Forums!

A "5 KV photovoltaic" system seems unusually high. Did you really mean FIVE THOUSAND VOLTS? What exact voltage is the conventional electric supply you want to apply the PV system to? If you could post a block diagram of your system plan we could possibly make some suggestions. Please label all the blocks and all voltages on the diagram for clarity. Thank you.
Mar17-13, 03:58 AM
Sci Advisor
PF Gold
davenn's Avatar
P: 2,721
he probbably meant to say 5kVA (5kW)

lets wait and see ;)


Mar17-13, 04:04 AM
P: 3
Help regarding application of solar in conv. electric ckt

hi guys
i am sorry for posting wrong requirement
i have corrected it
plz provide ur valuable guidance for this
Mar17-13, 04:27 AM
PF Gold
P: 1,909
pavis1313, thanks for the clarification: Your PV panel has a 5KW output capacity. What is the voltage and frequency of the "conventional electric supply"? What is the input voltage and power requirement of the fans? What are cfls and what voltage/power do they need?

If the conventional electric supply is 50 or 60 Hertz AC (Alternating Current) you cannot connect the PV panel directly. The PV panel outputs DC (Direct Current). I can only guess because you've not given a basic block diagram. Probably you'll need an Inverter to convert the DC from the PV panel to AC. Without knowing your system setup or voltage/power requirements few other reasonable useful suggestions can be offered.
Mar17-13, 08:55 AM
P: 3
thanks for your advice
the voltage and frequency of conventonalsupply is 230V/50 Hz
the fans are of 80 watt and the cfls are of 21 watt.
I know that i would be usind an inverter and charge controller to convert dc generated from solar to ac.
But my main question is whether there is and device or equipment that can make us use both the supplies together a kind of bidirectional device that works automatically and manages both the voltages.
Mar17-13, 04:58 PM
PF Gold
P: 1,909
Thank you for making clear exactly your requirement. You need one of these:

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