Odd charging behaviour of DFR0850 when MPPT disabled
Hello guys,
I didn't find anything about this online so I'm trying to get Reddit help. I have a CN3767 (solar power manager from dfrobot), shows as SKU DFR0850, also in their wiki and a 12V Lead acid battery. I want to charge it with my 18V power supply. When I connect the battery to the board with mppt disabled, the charge indicator will show it's > 75% charged (maximum it can show), and when I plug in the power supply, the led is on charge for a second or two and then switches to done. When I connect the same battery to the board with mppt enabled, it will show as 50%-75% charged, and the charging LED stays on. Per my understanding, MPPT maximizes the yield of a solar panel, it should have no effect on the charging status of my battery? And when I charge with a power supply there is no need to have it on? I sadly didn't bring my Multimeter with me and have nothing to measure right now, but maybe someone has an idea.