Such solar kits usually have PWM charging, they need PV voltage higher than the battery voltage.
On Wed, Jun 29, 2022 at 1:29 PM hans <[email protected]> wrote: > 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 regards > Hans > > 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 use >> Such 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. >> regards >> Hans >> >> 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 >> >> -- >> You received this message because you are subscribed to the Google Groups >> "jallib" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/jallib/3220a563-f63f-435b-b0a6-c088cc777aaen%40googlegroups.com >> <https://groups.google.com/d/msgid/jallib/3220a563-f63f-435b-b0a6-c088cc777aaen%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> >> -- >> You received this message because you are subscribed to the Google Groups >> "jallib" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/jallib/CAM%2Bj4quz-mvFLM7nuWmPg0YBcQCGNLDqw09bJMr%3DbKpmALa9TQ%40mail.gmail.com >> <https://groups.google.com/d/msgid/jallib/CAM%2Bj4quz-mvFLM7nuWmPg0YBcQCGNLDqw09bJMr%3DbKpmALa9TQ%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> >> -- >> You received this message because you are subscribed to the Google Groups >> "jallib" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/jallib/b59b60f5-848e-4d33-b9d9-a6bc2b872dabn%40googlegroups.com >> <https://groups.google.com/d/msgid/jallib/b59b60f5-848e-4d33-b9d9-a6bc2b872dabn%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- > You received this message because you are subscribed to the Google Groups > "jallib" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/jallib/16197ba2-f8db-441f-865b-3acd184f4d7en%40googlegroups.com > <https://groups.google.com/d/msgid/jallib/16197ba2-f8db-441f-865b-3acd184f4d7en%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "jallib" group. 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