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Why aren't my charge controllers reaching 13.5 volts? Is one of the controllers faulty?
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Why aren't my charge controllers reaching 13.5 volts? Is one of the controllers faulty?
Interested in my new garden workshop? Follow the entire build on Julian's Shednanigans:
https://www.youtube.com/channel/UCXfDjPehpC7B7lW2JFxeS4w
Subscribed to my 2nd channel? Watch all my 3 minute videos on Julian's Shorts: https://www.youtube.com/channel/UCeewzdnwcY5Q6gcbnZKIY8g
Follow me on Odysee: https://odysee.com/ @julian256:d
Any way to steady the voltage source to charge lithium from pwm, or mppt ?
I'm interested on ur available thoughts about charging lithium?
I guess if you knew they were all going to be low in that range you could probably tweak the code but it seems like you said you did you voltage divider so the math was easy so it might not be so easy to to change
ummmm on present performance those 220pf caps will probably only be 91pf.
If the error on the regulator is 3%… Seems like it would be a good idea to have this as part of the software.
Do a measurement, then write a specific value in the PIC when programming so it is adjusted for the specific regulator error.
You're using a PIC 12F on these, right? Does it have a FVR peripheral? If so, you could probably use Microchip AN1072 and AN1333 as a basis for reading the supply voltage, similar to how it's possible to read the bandgap voltage on AVRs. Thus you can have the PIC correct for voltage drift/error from the regulator.
Substitute the PIC12F1840 for your PIC12F683. The 1840 has a built in 2.048 or 4.096V ADC reference. And they're cheaper.
There may be voltage drop during charging, but there shouldn't be once the circuit goes into float modulation; there's no current to cause a drop.
And a tolerance on the voltage divider
I'm doing 18650 3s pacs and wonder how to balance charge individual batteries. Have u don a vid?
The HT7550 come in a few types. Don’t quote me but I think the -1 model is accurate to 3% the -2 to 2% and the -3 to 1%. It wouldn’t surprise me if they all came off the same line then were etched depending on an accuracy test post manufacture! They’d be a direct swap in replacement though and might make an interesting comparison?