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. 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