How to simulate solarpanel

166

01:07:38

Need help. How can I simulate Solarpanel  (100 W,  20V, 5A DC)?

In my circuit I use a voltagesource of 20V. But i can not modify a current.

The reason why I am trying to do this is, I want to put a SMD 0805 behind the 850 om resistor. 

The SMD 0805 needs 2.5V and can take 0.025 A max. So I need to reduce the voltage of source from 20V to 2.5 V. That means a voltagedrop need to be 17.5 V. So I can calculate the resistor 17.5 V / 0.025 A=700 Om.

The next question is, can I somehow simulate a SMD with its Data (0.025W and 2.5V) or I need to use a bulp symbol?

published 7 years ago

hurz

7 years ago

0805 can take 0.125Watt or 1/8Watt 125mW/0.025A=5V anyway, 20V - 2Vled => 18V / 0.02A = 900 Ohm. 0.02A² * 900 = 350mW ! So one solution is to use 4 resistors. 2 x 2 parallel and then in series so you get the equal total resistance but a four times higher power rating 0.125 x 4 = 500mW which is high enough. Or you put 3 times 300 Ohm in series to get 900 Ohm and 375mW which is quite close to the power disspation. With less then 4 resistors you get to close. Another solution is to use a bigger smd package. Note, in your circuit you have used a 2V 20mA LED

pownyqt

7 years ago

Thank you for rapid respond Hurz!

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