Hi Rob, My shadows are getting longer, but the sun is still shining. regards Hans
Op zondag 10 juli 2022 om 09:43:45 UTC+2 schreef [email protected]: > Very nice Hans and good to see that it works. > > You should start a solar farm 🙂 > > Kind regards, > > Rob > > ------------------------------ > *Van:* [email protected] <[email protected]> namens hans < > [email protected]> > *Verzonden:* zaterdag 9 juli 2022 17:35 > > *Aan:* jallib <[email protected]> > *Onderwerp:* Re: [jallib] sun power use > > Hello all, > > Here is the solar panel I will be using. I just went back to 12 volts and > a small lead acid battery. One motor drives the axis that is parallel to > the Earth's axis and follows the sun. Actually the screen should go 24 > degrees up (June) and 24 degrees down (December) but I did some > measurements and the gain is too small for me to do anything about it. > > Anyway, Jal lets things run smoothly again and now we just have to wait > and see if the weather gods accept this thing. > > regards > > Hans[image: zon_set.jpg] > > Op woensdag 29 juni 2022 om 17:28:57 UTC+2 schreef hans: > > Hello > Kiste > I still have to come up with something to switch off in time due to too > low voltage, but you did wake me up. Thank you. > Vasile > Years ago I had a larger solar panel rotate with the sun. I did the > incline manually. However, the rotating construction must be very heavy and > in a big storm I was only just able to save the case > Near us there is a park with 12 such panels, it was always surprising that > they are never all in the right direction. A technician in this field told > me that the added value in yield is almost lost at the cost price of the > installation and that they now just use fixed panels. > And nevertheless it is very nice to be working on this. The application of > the MPPT is again its news for me. > thanks everyone > regards > Hans > > Op woensdag 29 juni 2022 om 16:22:16 UTC+2 schreef vasile: > > About keeping up with consumption, PV has to (i) charge the battery and > (ii) supply your board. > If you really want to try something new, then a two axis tracking system > will improve your charging by about 40% with the same PV. > Why? Because the PV will stay oriented to the sun, except for minor clouds > and heavy rain when everything will be disintegrated :) > > https://www.banggood.com/Smart-Solar-Tracking-Equipment-Maker-Project-DIY-Kit-Technology-for-Arduino-p-1952195.html > > > > On Wed, Jun 29, 2022 at 4:39 PM 'Oliver Seitz' via jallib < > [email protected]> wrote: > > 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 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. > 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/366793553.5677601.1656509982227%40mail.yahoo.com > > <https://groups.google.com/d/msgid/jallib/366793553.5677601.1656509982227%40mail.yahoo.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/675be8f1-9300-4934-8467-1466f4faf675n%40googlegroups.com > > <https://groups.google.com/d/msgid/jallib/675be8f1-9300-4934-8467-1466f4faf675n%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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