Justin Kenny via EV wrote:
Not sure if you understood the previous 2 messages, the Zener diode will
drain your battery, and a diode will not stop it from overcharging. I
really suggest to use the right tool for the job, $3.25 for a
constant-current constant-voltage converter isn't much cost to save your
battery pack from being killed prematurely, or at worst preventing a
fire/destruction by overcharging: https://www.amazon.com/dp/B00LPK0IKQ
I think we got it, Justin. My suggestion is to use *two* diodes; a zener
across the PV panel (to clamp its maximum voltage), and a series diode
between them and the battery to charge. Schematic (view it with a
fixed-width font like Courier. Periods are just to stop your browser
from removing the blanks):
+ ------o------|>|------- +
| . . . | . . . . . . . . |
PV. . zener . blocking. . Li
panel diode . .diode. . .cell
| . . . | . . . . . . . . |
- ------0---------------- -
If you choose the right diodes, it guarantees the Li cell can't go
overvoltage even in full sun when fully charged. And, it guarantees the
battery current is zero when there is no sun (won't discharge the battery).
Of course you can design more complicated circuits that work better. But
sometimes the "perfect" is the enemy of the "good enough".
Lee Hart
--
When something bad happens, you have three choices: You can let it
define you; let it destroy you; or you can let it strengthen you.
-- Theodor Seuss Geisel
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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