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I have a solar panel 18V 2W. How do I calculate how much power that is at 5V?

Thank you in advance

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    \$\begingroup\$ Depends on the efficiency of your 18V to 5V converter. But it'll be something around 2 Watts minus inefficiencies of your converter. Also, don't forget an 2 Watt solar panel is only 2 Watts in the best case, usually it will be significantly less. \$\endgroup\$ – Puffafish Jul 2 '19 at 12:17
  • \$\begingroup\$ Just remember that you can't get a power output that is higher than the input when you are stepping the voltage up or down. Any voltage converter cannot have an efficiency of more than 100% \$\endgroup\$ – Harry Svensson Jul 2 '19 at 12:23
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You will have 2W less losses at 5V, which means more current.

2W / 5V = 0.4A max assuming no losses...
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  • \$\begingroup\$ Thank you for your fast reply \$\endgroup\$ – Henrik Lauridsen Jul 2 '19 at 12:54

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