User:Definitionofis

Fridge Defrost Timer with Solar Trigger Option

The project video shows a fridge timer which can be set to trigger during high battery voltage sunny days so the defrost cycle never uses valuable battery power. It is switchable to act like a regular defrost timer for long cloudy stretches of time, like winter.

Solar panel rotator motor power with auto-shut-off

The project video shows a way to power solar panel rotator motors from a solar panel, supplemented by a walladapter.

MPPT Solar and Wind Power Boost Charge Controller

THIS IS NOT READY. I still have more testing to do. Later, I think I will sell my nine extra boards with one LTC3703 soldered in place, for $59.95US if you want to try the circuit. After they are gone, I might release the board layout diagram, which is critical to success.

I have some documentation videos. It is 9v through 60v MPPT boost to a 48v nominal lead-acid battery. It needs more testing after I attach a wind turbine and a monitoring microcontroller. Otherwise, it seems to work, so far. How much power can it handle? I am not sure yet. I think 500 watts minimum and maybe 1K watts and with different mosfets and diodes and more copper over the traces, 4000 watts.

This circuit is an analogue computer, when run without a microprocessor. It is doing integration math, via the op amp. I added a jumper for optional microprocessor control. I have not tried it, yet.

http://www.opencircuits.com/images/9/97/Mppt_schematic_asof_Jul22_2012.png