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1.5A usb/dc/solar lipo charger
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1.5A usb/dc/solar lipo charger

by gkj on Fri Jan 21, 2022 10:58 am

Sorry for posting this again, my other posts received many view but 0 responses...

Two of my bq24074 chargers don't seem to be charging my batteries. When i connect power both the CHG and Pgood leds come on. The Voltage across the battery terminals remains low. Batteries never charge regardless how long I leave them connected. I bought 3 bq24074 the first one is working fine in my weather station for many months now (connected to a 6V solar panel). But my second project keeps draining the battery to under 2V despite good charger, I have tried 5.5V solar, 5V 2A charger and 10V 1A charger not working.

any guidance on troubleshooting?

gkj
 
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Re: 1.5A usb/dc/solar lipo charger

by adafruit_support_bill on Fri Jan 21, 2022 12:07 pm

What batteries are you using?

adafruit_support_bill
 
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Re: 1.5A usb/dc/solar lipo charger

by gkj on Fri Jan 21, 2022 12:24 pm

I am using 18650s two types I have tested with Samsung INR18650 30Q and Minamoto LI-18650-220

regards

gkj
 
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Joined: Wed Jan 12, 2022 9:56 am

Re: 1.5A usb/dc/solar lipo charger

by adafruit_support_bill on Fri Jan 21, 2022 12:38 pm

Those cells do not have integral protection circuits, so there is nothing to stop them from over-discharge. If the bq24074 detects that a cell has discharged below the safe level, it will not initiate the charge cycle.

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Please be positive and constructive with your questions and comments.