Works as specified if you stay in the limits. Just a little warning: during my tests, I lowered the input voltage and under 3.5V, the circuit doesn't cut but becomes crazy and the output (that was set to 15V with the pot.) jumps to 40V with no load. With a 2k resistor at the output, it only goes to 30V. Of course, this is under the specified minimum voltage, but for solar applications, how can you guarantee that the input voltage will not be there? So when it says "Module Suitable For Solar Panel" I'm suspicious. If you really want to use it like that, you could add a small circuit between the solar panels and the converter to cut it if the voltage drops under the minimum 3.8V or clamp the output with a zener (there's no voltage rating on the output capacitor so that kind of overvoltage could damage it if it is not designed to handle 40V) Also the problem with that kind of circuit is that if you try to extract too much current from a solar cell, its voltage drops, but then the converter will try to get even more current to keep it's output and the input voltage drops even more... So you also have to add a circuit that limits the output current when the input voltage drops. Conclusion: good circuit if you use it properly but not really appropriate for solar panels despite what it says in the title.

Works as specified if you stay in the limits. Just a little warning: during my tests, I lowered the input voltage and under 3.5V, the circuit doesn't cut but becomes crazy and the output (that was set to 15V with the pot.) jumps to 40V with no load. With a 2k resistor at the output, it only goes to 30V. Of course, this is under the specified minimum voltage, but for solar applications, how can you guarantee that the input voltage will not be there? So when it says "Module Suitable For Solar Panel" I'm suspicious. If you really want to use it like that, you could add a small circuit between the solar panels and the converter to cut it if the voltage drops under the minimum 3.8V or clamp the output with a zener (there's no voltage rating on the output capacitor so that kind of overvoltage could damage it if it is not designed to handle 40V) Also the problem with that kind of circuit is that if you try to extract too much current from a solar cell, its voltage drops, but then the converter will try to get even more current to keep it's output and the input voltage drops even more... So you also have to add a circuit that limits the output current when the input voltage drops. Conclusion: good circuit if you use it properly but not really appropriate for solar panels despite what it says in the title.

Works as specified if you stay in the limits. Just a little warning: during my tests, I lowered the input voltage and under 3.5V, the circuit doesn't cut but becomes crazy and the output (that was set to 15V with the pot.) jumps to 40V with no load. With a 2k resistor at the output, it only goes to 30V. Of course, this is under the specified minimum voltage, but for solar applications, how can you guarantee that the input voltage will not be there? So when it says "Module Suitable For Solar Panel" I'm suspicious. If you really want to use it like that, you could add a small circuit between the solar panels and the converter to cut it if the voltage drops under the minimum 3.8V or clamp the output with a zener (there's no voltage rating on the output capacitor so that kind of overvoltage could damage it if it is not designed to handle 40V) Also the problem with that kind of circuit is that if you try to extract too much current from a solar cell, its voltage drops, but then the converter will try to get even more current to keep it's output and the input voltage drops even more... So you also have to add a circuit that limits the output current when the input voltage drops. Conclusion: good circuit if you use it properly but not really appropriate for solar panels despite what it says in the title.

Wird in Zukunft mit alten PC-Netzteilen für variable Spannungen verwendet. Ich habe es mit einem Netzteil getestet und die Ausgangsspannung gemessen. Der Eingang war 7,2 Volt. Ich habe den Ausgang bei Spannungen von mehr als 25 V bis hinunter zu 1,5 Volt verwendet. Der Trimmer für die Ausgangsspannung ist extrem empfindlich (10-Turn-Potentiometer), so dass die genaue Spannung einfach eingestellt werden kann. Die Eingangsspannung sollte für einen stabilen Ausgang 5 Volt oder höher betragen.

Will bu used in the future with old PC-power-supplies for variable voltages. I have tested it with a power supply and measured the output voltage. The input was 7.2 Volts. I have used output at voltages of more than 25 V down to 1.5 Volts. The trimmer for the output voltage is extremely sensitive (10 turn potentiometer) so that the exact voltage can be set easily. The input voltage should be 5 Volt or higher for stable output.

Wird in Zukunft mit alten PC-Netzteilen für variable Spannungen verwendet. Ich habe es mit einem Netzteil getestet und die Ausgangsspannung gemessen. Der Eingang war 7,2 Volt. Ich habe den Ausgang bei Spannungen von mehr als 25 V bis hinunter zu 1,5 Volt verwendet. Der Trimmer für die Ausgangsspannung ist extrem empfindlich (10-Turn-Potentiometer), so dass die genaue Spannung einfach eingestellt werden kann. Die Eingangsspannung sollte für einen stabilen Ausgang 5 Volt oder höher betragen.