Hi Hans,
it's true, you don't need to worry about charging, but you do need to worry
about stopping discharging. LiPos may explode if overcharged or
over-discharged. The device you've bought has both- charge and discharge
controller. But, with your extra wires, you're discharging the LiPo directly
without the discharge controller. That is ok, if you're really sure the LiPo
will never go empty. If you're not so sure about that, you would need a way to
stop discharging at a certain voltage, like 2.6V. Really switching electronics
off to only keep drawing few nanoamperes is possible, but not always easy.
Greets,Kiste
Am Mittwoch, 29. Juni 2022, 12:34:35 MESZ hat hans <[email protected]>
Folgendes geschrieben:
Hi Rob,
The set has both a solar panel and a lipo battery, so I don't have to worry
about charging. I'm just curious if the solar panel can keep up with the
consumption. I can also charge it via USB.
By the way very nice to see a project, most of the contributions are very
abstract.Kind regardsHans
Op woensdag 29 juni 2022 om 11:44:28 UTC+2 schreef [email protected]:
Hi Hans,
Don't make it more complex than it is. An MPPT (Maximum Power Point Tracking)
is used on solar panels to get the most out of it but you do not have to add
such a device.
If I am right a Lipo battery needs a certain way of charging and so you need a
special Lipo battery charger.
I made a Cat repellent some time ago using a small solar panel. And since I am
using three NiMh batteries (so 3.6 Volt) I use a small charging current for
keeping the batteries charged. The batteries are connected to the solar panel
only via a diode (Shottkey in this case because it has a low voltage drop).
For your info. You can find the schematic diagram here:
https://www.instructables.com/Cat-Repellent/
Kind regards,
Rob
Van: [email protected] <[email protected]> namens hans
<[email protected]>
Verzonden: woensdag 29 juni 2022 11:22
Aan: jallib <[email protected]>
Onderwerp: Re: [jallib] sun power useSuch a prompt response! I bought a solar
charger with a built-in 5000mAh battery. It delivers a beautiful 5 Volt but
with a minimum load of 150 mA. Opened the case and the lipo delivers 3.5 Volts.
So I soldered a few more wires to it. Hence my question. It's still so much fun.
Now i have to discover what a MPPT is.regardsHans
Op woensdag 29 juni 2022 om 09:59:30 UTC+2 schreef [email protected]:
Hi Hans,
Most PICs can operate at 3 Volt, below a screenshot from the datasheet. I only
use F versions.
Just check the datasheet for the PICs that you have.
I have done several projects using a PIC that is supplied by batteries so
operating at 3 Volt or lower.
What I do not know for sure if when you program the PIC if it should be at 5
Volt, maybe only if you use Low Voltage Programming, so I normally program the
PIC when it is connected to a 5 Volt power supply but in the application it can
run even on a supply voltage as low as 2 Volt.
If you have peripherals that work at 5 Volt you could always use a step-up
converter to step-up the power supply from 3 Volt to 5 Volt.
Kind regards,
Rob
Van:[email protected] <[email protected]> namens vsurducan
<[email protected]>
Verzonden: woensdag 29 juni 2022 09:11
Aan: [email protected] <[email protected]>
Onderwerp: Re: [jallib] sun power use You may continue to use it at 5V if the
energy extracted from the PV is drawn via a MPPT ( maximum power point
tracking) IC and your solar panel assures the current needed for your
electronics. Many panels have 6V open at 0.3A or 0.5A short circuit current
Actually any actual PICmicro will run on 3.3V ( including those rated for 5V)
if the internal oscillator is set to maximum frequency intended only for 3.3V.
Most of the low power PICs ( LF series) will run down to 2.2V ( some down to
1.8V) so you may connect the solar panel directly on your LDO without MPPT or
PWM.best wishes
On Wed, Jun 29, 2022 at 9:57 AM hans <[email protected]> wrote:
Hello all,
I don't want to reinvent the wheel. Until now I have always used 5 volts supply
voltage, but because of a solar panel I would like to work on 3 volts. Which
processors should I use and what should I pay attention to?
Thank you in advance,
greetings Hans
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