Solar charge board (MPPT) (CN3791)
Solar charge board (CN3791-type) · panel 19–28 V in · holds the panel at 17.5 V (its maximum-power point) and charges with whatever that gives, up to 1.5 A · CC/CV to 7.3 V · no back-feed at night
Try it on the benchThe lab drops it on an empty bench and opens its datasheet card.
Typical part: Solar charge board (CN3791-type MPPT)
Pins
- PV+
- PV−
- BAT+
- BAT−
Ratings and limits
| Panel | 19–28 V (a “12 V” panel: Vmp about 17.5 V) |
|---|---|
| Holds the panel at | 17.5 V |
| Charge | CC/CV to 7.3 V, up to 1.5 A |
How to use it
Charges small lithium packs straight from a panel. It keeps the panel at its maximum-power voltage, so a cloud lowers the charge current instead of collapsing the panel.