24VDC to 35VDC

[Brian Rys]

I need to make a circuit to increase a 24V solar panel voltage to 35V. How can this be done? My max output current only needs to be about 150mA max. Would a 10w solar panel be able to accomplish this?

 

[Harald Kapp]

Welcome to EP, Brian.

1) You will need a step-up converter or boost converter like e.g. this one.
2) 35V*150mA=5.25W. Taking into account 90% effficiency of the converter (a conservative number which tells you that 90% of the energy input are available at the output) means your input power is 5.8W. A 10W solar panel is sufficient.

Note that the 10W for the solar panel wil only be achieved under optimum conditions. It will deliver considerably less on a cloudy day.
To get the maximum energy from your panel you can use an MPPT controller, but that's probably overkill in your application.

 

[Colin Mitchell]

Get another little 5v plus 5v 200mA solar panels. That's what I did $3.00 each