6 Feb
2020
6 Feb
'20
8:35 a.m.
I got 4 of these last week. I've got one board setup to do some testing.
Basic setup is ESP32 with....
10k/10k voltage divider on battery (tested, working)
2k/12k voltage divider on the 12v solar cell (not tested yet)
To start I'm just going to do some basic monitoring/logging, I also have
some ASC714 current sensors I thought I might add in.
If anyone can think of some specific tests to do let me know. Mostly I got
these to get some monitoring infrastructure in place for some
other solar projects.
On Thu, Feb 6, 2020 at 8:20 AM <samuk(a)disroot.org> wrote:
I spotted this LifePO4 module, the schematic and BOM
are CC-BY-SA
https://hackaday.io/project/13260-lifepo4weredsolar1
Thanks
Sam
January 17, 2020 11:09 AM, "Marc Juul" <marc(a)juul.io> wrote:
On 1/16/20, samuk(a)disroot.org
<samuk(a)disroot.org> wrote:
> Hi all
>
> I've been looking into solar a bit, in the process, I came across this
MPPT:
Yeah that's the Waveshare module. Unfortunately it uses the CN3791
which is what we used on the previous disaster.radio prototype. It is
not true MPPT and does did not perform well. It is super cheap though
(less than 50 cents I believe). I think this one is probably decent:
https://www.sparkfun.com/products/12885
but it has to be modified to support the full 2A and they didn't break
out the temperature sensor pin.
We just started working on our own MPPT module but that will take a
while. You could also try to modify Elektra's ESP32 based module for
Li-ion operation:
https://media.ccc.de/v/36c3-oio-166-ff-esp32-openmppt-new-freifunk-isems-mp…
ntegrated-wifi
--
marc/juul
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