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.
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From the brand
IRHAPSODY Store
5+ years selling on Amazon
Product Description
- Normally Open with 80 Ohms Coil Resistance
- The size of the round stud terminals: M6/6mm
- Nominal coil voltage: 12VDC
- Pickup voltage: 8VDC
- Dropout voltage: 1.2VDC
- Maximum applied voltage: 14VDC
TERMINALS
- 85 Coil, Ground
- 86 Coil, Trigger
- 87 Normally Open (N/O)
- 30 Common connections to NO & NC terminals
Reviews with images
Heavy duty relay
Relay has 1/4" lugs and all the hardware you need except for mounting the relay is included.Accessories include 6 AWG copper crimp terminals (should work with 8 AWG, but if you have 4 AWG wire you will need to provide your own terminals.Also included is heat shrink for the crimp terminals, wire for the coil (takes standard butt connectors), and 4 extra washers per relay.Photos show amperage required to operate the coil at different voltages.Coil amperage at 13.8 volts is 0.16 ampsMinimal voltage required to activate the coil is 7.5 voltsLowest voltage to keep the coil activated is 2.4 volts (any lower it will turn off)I plan on using this to activate a fuse box for an overkill air horn system, so it will only be activated momentary. The relay is rated for continuous duty. It is heavy and feels well built.
Top reviews from the United States
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Reviewed in the United States on February 11, 2024
Size: 2 sets of 12V-200A-4PINVerified Purchase
Relay has 1/4" lugs and all the hardware you need except for mounting the relay is included.
Accessories include 6 AWG copper crimp terminals (should work with 8 AWG, but if you have 4 AWG wire you will need to provide your own terminals.
Also included is heat shrink for the crimp terminals, wire for the coil (takes standard butt connectors), and 4 extra washers per relay.
Photos show amperage required to operate the coil at different voltages.
Coil amperage at 13.8 volts is 0.16 amps
Minimal voltage required to activate the coil is 7.5 volts
Lowest voltage to keep the coil activated is 2.4 volts (any lower it will turn off)
I plan on using this to activate a fuse box for an overkill air horn system, so it will only be activated momentary. The relay is rated for continuous duty. It is heavy and feels well built.
Accessories include 6 AWG copper crimp terminals (should work with 8 AWG, but if you have 4 AWG wire you will need to provide your own terminals.
Also included is heat shrink for the crimp terminals, wire for the coil (takes standard butt connectors), and 4 extra washers per relay.
Photos show amperage required to operate the coil at different voltages.
Coil amperage at 13.8 volts is 0.16 amps
Minimal voltage required to activate the coil is 7.5 volts
Lowest voltage to keep the coil activated is 2.4 volts (any lower it will turn off)
I plan on using this to activate a fuse box for an overkill air horn system, so it will only be activated momentary. The relay is rated for continuous duty. It is heavy and feels well built.
Images in this review
Top reviews from other countries
Michael Frymus
Works like a charm!
Reviewed in Canada on December 17, 2023Size: 12V-200A-4PINVerified Purchase
Denis Barrette
Great unit to have
Reviewed in Canada on November 19, 2023Size: 12V-200A-4PINVerified Purchase
