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We can guess the 12 LED lamps are wired in parallel, and each has its own individual dropping resistor or driver circuit. (Because if they were wired in series the power supply voltage would have to be at least 12 times the individual LED forward voltages, probably 15V or more total). I'd say you just need a 5V supply that can supply at least 1.2 A. I'd ...


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Bypassing an MPPT controller with a diode is not a good idea, because when the diode is conducting current, it will create problems for the MPPT controller and it's power calculation. It would be better to have a separate MPPT and BMS The other problem is the DC/DC converter's doesn't have a cutoff, and stops at 4V so the cells will be overdrawn (and die) if ...


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The linked PDF specification file that you have shown in "specs", is clearly saying: TP4056 chip itself (NOT THE TP4056 BASED CHARGER-MODULE WHEN PLUGGED IN WITH LI-ION BATTERY) needs minimum 55µA (micro-Ampere) or higher to operate/charge a regular condition Li-ion battery. ''(by the way, usually specs have multiple pages in range of 2 to 10+, but ...


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You can parallel two Solar panels of the same voltage, although the battery pack accepts more power on the USB-C port at 18W=9Vx2A than the 10W=5Vx2A port. So I would be looking for a 9V Solar panel in the 25W range which would have an open circuit voltage of 12V (Voc). Then you need a UBC-C cable and wiring diagram. However I don't find anything in a ...


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It seems like your understanding is pretty much correct. There is just one clarification. The Voc and Vmpp are only slightly sensitive to irradiance. See attached graphs which are real DC data from one string in my grid-tie solar array. The grid-tie inverter logs data at 5 minute intervals. As you can see, Vmpp does not vary much during the day. And its ...


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The simple answer is that when there is both sunshine and a charged battery, both can be used simultaneously. Any combination is possible with the right control electronics, so it will differ depending on what the manufacturer wants to happen. The battery will always be the more powerful unit, so when solar panel and battery are both available, the solar ...


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You have the diode backwards. Connect the black end of the diode to the red wire from the solar panel, and the end of the diode with the silver band to the red wire of the battery holder. A 4.5V solar panel won't generate enough voltage to charge the batteries. Lithium ion cells have a voltage of 3.6 volts and higher. Four such cells in series means a ...


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Please pardon me if I am being rude, but its coming from someone whose worked a lot on solar and lithium chargers and I would advise, please treat lithium batteries with respect, unless they have protection circuit built in. Can you choose readymade IC/Parts? In case you can choose the parts, please get these two below TP4056 module with protection ...


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