I would like to design a “pass through” charger with optional solar input for 4 18650 cells. The load will be a raspberry Pi with some number of USB connections.
-If external power is connected, battery should continue to charge while powering the load
-If external power is disconnected, it should switch to battery power without current or voltage drop.
What IC/devkits should I look at? Max budget is about $50.
Many thanks in advance
Joe
Welcome to the forum.
The Waveshare Raspberry Pi UPS HAT has schematics and IC data sheets for their design on their Wiki.
I tend to just buy low end APC & CyberPower UPS’s designed to run a high power PC and use them for multiple Pi’s to save money.
If I needed to save space, I’d try out the Waveshare product.
There are many discussions of this topic at the Raspberry Pi forum.
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I looked into this. For a variety of reasons, I’m not really interested in a hat.
Furthermore, I recently purchased from WaveShare. My experience was not positive.
However, I will review their wiki to see if I can find anything else useful.
Yeah, I remember these guys. They are pretty awesome, I’m glad they made it to DigiKey. Not sure it will work in my application, will read more.
Thanks so much!
Joe
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