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I'm trying to create a little solar charger with backup battery for my Arduino. I would like to use a MPPT controller for the solar panels. I found a few solutions like the IC CN3722, but all of these solutions need a battery (or have too many functions to monitor a battery charge). Because I want to use a few 18650 Li-Ion batteries I would use a battery management system.

Are there MPPT IC's that have a direct load output which I can use as input for my BMS?

I'm sorry for these newbie question but I searched the whole week and didn't find anything.

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  • \$\begingroup\$ MPPT plus battery charging is a complicated problem, because the battery puts a maximum on the amount of power it can absorb, and that maximum depends on the battery's state of charge. So you could only get MPPT while the battery can absorb it -- then the controller needs to gracefully switch over to transferring only as much power as the battery can take. If that were done by separate chips, there would need to be communication between them to make it work -- so you may as well do it all in one. \$\endgroup\$ – TimWescott Jul 26 at 23:35
  • \$\begingroup\$ Thanks for your Explanation. I decided to go another way and use a acid battery instead of lithium ion. I created this circuit for it: imgur.com/a/cZVjLBV. I hope this will work as good as I think also with my attempt with a load share. \$\endgroup\$ – vayed Aug 17 at 10:25

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