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I did some preliminary work with the BQ24650 solar panel battery charger controller eval board, it seemed to work ok with a 12V Lead Acid battery. I’ve got the circuit on a custom PCB now and I have some questions because it indicates charging but there is no current going to the battery:
MPPSET < 1.2V
Thermocouple input out of range
VFB >2.1
The voltage across the current sense resistor (0.04 ohms for 1.0A current limit) is virtually 0.0V.
I did a point-to-point verification between our schematic and the eval board, no issues found.
We are using a NiMH battery pack (4S, 4.8V nominal, charge to 5.6V), but at 1Amp charge there should not be a problem.