Alessandro | Jan. 24, 2025

Super happy

For Solar harvesting into Lithium Ion Capacitor

Just received the packet with the electronics well packed and protected and a small note as well. Can't wait to start play with it!

Response from Jasper Sikken | Jan. 25, 2025

Thanks Alessandro

Rob | Dec. 13, 2023

Excellent board and excellent support

For Solar harvesting into Lithium Ion Capacitor

I got one of these to help my esp32 weather station survive the Canadian Winter. So far its managing the short days and cold temps very well.

Support from the developer has been top notch, in fact one of the best, if not the best, support experiences I've had in several years.

Would highly recommend this product.

Response from Jasper Sikken | Dec. 14, 2023

Thank you Rob

Federico | Oct. 27, 2023

Great product

For Solar harvesting into Lithium Ion Capacitor

Great quality product, works as expected! I'll buy another one soon! Jasper kindly answered to all my doubts and questions, thank you very much!

Response from Jasper Sikken | Dec. 14, 2023

Thanks Federico

Michael | July 12, 2023

Just go for it!

For Solar harvesting into Li-ion battery

The board is plug and play and it does exactly what it should! Jasper is also very helpful, he answered all my questions almost instantly and shipped my order super fast (it took just 4 days for it to arrive in France with the cheapest shipping option and the weekend in between). I'll definitely reorder more if I expand my project!

Response from Jasper Sikken | July 12, 2023

Thanks Michael

A | April 27, 2023

Exceeds my expectations

For Solar harvesting into Lithium Ion Capacitor

My project entailed a small greenhouse. Even in early Spring, the temperature inside can reach > 40°C on sunny days and I didn't want to arrive home at a collection of withered seedlings. So it would have to open and close automatically. This solar energy harvester is perfect for the job because there is abundant energy when it is most needed: when the sun shines.

I paired it to a cheap solar cell that I got off one of these cheap Chinese solar lamps looking like a rock that I had lying around. I paired it to a modified Arduino Pro Mini (which only uses 5 µA in deep sleep), and drive a small electric motor with it through an Adafruit DRV8833 motor controller.

The whole setup works better than I could dream of. The lithium capacitor holds enough charge for tens of open/close actions. And at 5 µA it can go for weeks without light. Even on overcast days it is able to charge. It's an incredible device.

I purchased version 2 and after living for a month in my window sill to test it out, the buck converter mysteriously died when I was at the point of integrating it into my project. Jasper didn't waste any time and swapped it for a new one without hassle. Bonus: I got a version 3 instead which can deliver a higher current.

Highly recommended!

Response from Jasper Sikken | April 27, 2023

Thanks A for the great review