irhapsody Relay 120A, 24V Continuous Duty SPST 4-pin High Power Relay

This is for an off-grid cabin where the solar array and battery bank are at 24V but we step down the voltage to 12V using a buck converter and that is what the cabin runs on. We do not run an inverter. Running the core at 24V decreases losses and wire gauge requirements at that core, and also maintains a constant 12.3 volts throughout the cabin regardless of battery state. This approach works well for a small cabin and we don't have all of the inverter loss. (We can run a 680 sq ft cabin on just 400 watts of solar). I know this is not typical, but it has worked well for us for almost a decade now and has some advantages; when almost all of your loads are eventually DC (lights, devices, stereo, etc) it always seemed silly to invert to AC and convert it all back to DC. (we not have large appliances, because.....cabin, not vacation home. No microwave, instead just stove) I wanted a relay in order to have a remote power switch for the whole cabin that is in series with the load terminals on the charge controller, which has a low voltage automatic cutoff for battery protection, but that relay had to be able to handle a nominal 24V at the coil and is actually switching a 12V load. I also had to handle 30 amps @ 12V and wanted a lot of headroom. Yes, our entire cabin draws less than 360 watts peak, and we have a generator for the rare times when we need it for tools or other high loads or for emergency battery charging. We go months without using the generator. A prior cheap relay rated to 30amps got very hot and proved not to be durable. This is a sturdy relay with heavy terminals and never is warm to the touch. Thank you Amazon, for having all of the oddball parts that I would not know where to get otherwise.

Using this in a circuit that has 115 amps at 28VDC to switch and doing the job with no issues.

Perfect for home projects.

Worked great for 24volts dc

Very durable, size 10mm nuts, heavy duty.