NOYITO Low Voltage MOSFET Switching Module 3V 5V Low Control High Voltage 12V 24V 36V Field Effect Transistor Module

I use it outdoor in my mailbox and it has held up to cold Colorado winters

Great

This trigger switch works really well, very small, easy to wire in, switches fast, and at below the 5A threshold stays cool even when on for hours.I needed to solve the problem of how to actually use the Virtual Load Output of Victron MPPT SmartSolar controllers in the real world. The theory is that it can output 5v to switch a SSR, to therefore switch a more demanding load. Practice does not meet theory, even the most limited low power SSR cannot be switched by any of the SmartSolar controllers, the output signal voltage drops to 2.1v even at 1mA. Victron is pretty hopeless about helping use this gizmo, and the Victron forums only suggest designing a switch using a power transistor. What a nuisance... Hardly worth the high cost of their units. Or you could buy one of their battery savers, but they are hideously expensive and very limited in what they can do.So after many hours looking at amazon listings, i finally ran across this little widget. I ordered with a hope i could make it work, and after shorting out the LED, it works a charm. Easily switches with the weak SmartSolar output signal.The assembly is clean and simple, there are no instructions provided, but the data printed on the PCB is sufficient to use it. You do not need to ground both sides of the "-" terminal if you don't want to. A common ground from the output side is sufficient if you only need to switch the positive line.This item would be totally perfect if it had a jumper to bypass the LED, instead of having to remove it and add a solder short. Jumper in bypass, jumper out LED, would make this thing a total gem. But even without that, this is a nice piece of equipment that does what is says it will.Make sure you add a significant heat sink to the power transistor if you want to switch in excess of 5A.

Unlike some MOSFET modules on Amazon- this one uses a P FET. That means you can switch common negative devices which may attempt to ground through signal pins if negative is switched. For example, most 12v or lower consumer electronic devices work this way. You'll need this module if you plan on using PC fans, small switching PSU, etc. unless you want to add additional isolation for all signal wires.The module already includes a 1k resistor and LED (1.78v drop) indicator inline with the opto isolator (1.07v drop). With this you can calculate the i/v for your circuit.Note: minimum full on for MOSFET requires >= 3.21v. If you don't need the indicator LED, you can short it and drop the minimum to 2.07v