This switch has proven to be an excellent addition to my DIY projects for my custom power bank. This 12-48 V battery power cut master switch is incredibly reliable and ensures a secure disconnect when needed. The on/off functionality is straightforward and easy to operate, providing peace of mind when isolating the battery for maintenance or safety reasons.
One of the standout features is its robust construction. The switch feels solid and durable, capable of withstanding harsh conditions whether installed in a vehicle, RV, or boat. The installation process was simple and intuitive, with clear instructions that made it easy to get everything set up quickly.
The only minor downside is that it could benefit from slightly larger terminal posts for easier connection with heavier gauge wires. However, this is a small issue compared to the overall effectiveness and reliability of the switch.
I believe this switch is a highly recommended product for any DIYer looking to safely manage their vehicle or RV's battery connections. Its ease of use, solid build, and dependable performance make it a must-have for ensuring battery safety and maintenance.
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This item: Ampper Battery Switch, 12-48 V Battery Power Cut Master Switch Disconnect Isolator for Car, Vehicle, RV and Boat (On/Off)
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From the manufacturer
Ampper Battery Disconnect Switch
Manufactured by Ampper
Designed for 12V - 48 V Battery.
- Fit for 12V - 48 V systems
- Fit for Car, Vehicle, RV and Boat
- Fit for other electrical equipment
Ampper 12 - 48 V Battery Power Switch
Widely used in Car, Vehicle, RV and Boat, Also Electrical Equipment's Switch
Used for DC 12 - 48 V systems to isolate and secure the electrical system, can stand alone or be locked together with other switch. Eliminate any power draw from the battery when vehicle or boat is not in use, disconnects the battery safely.
- Operation: DC 12 - 48 V systems, On/Off 2 position.
- Convenience: easy to install & simple to use.
- Purpose: used for battery to isolate and secure the electrical system.
- Heavy duty, copper terminal & widely use.
Features
Heavy Duty & High Quality
ABS plastic housing, durable made for safety use, rear cover insulates terminals against any short circuit, equipped with 4 sets of bolts.
Durable Copper Terminal
10 mm (3.94 in) copper terminal, On/Off 2 position, 275 A continuous at DC 12V, 455 A Intermittent at DC 12V, 1250 A momentary at DC 12V.
Widely Use
DC: DC 12 - 48 V, could be used for Car, Vehicle, RV and Boat, also electrical equipment's switch.
Shuts the power down
I’m beyond pleased with how well it works. The switch itself is well-designed with a clear "ON" and "OFF" indication, and it rotates smoothly with little effort. The switch has a compact size, so it doesn’t take up too much space, which is perfect for installations in tight areas. It’s designed to handle a wide voltage range of 12V to 48V, which makes it versatile for use in many different applications. The wiring process was straightforward, and the switch fit perfectly where I needed it in my vehicle. For anyone familiar with basic electrical work, this is an easy DIY installation. If not, get someone who knows what they are doing. A simple turn of the knob is all it takes for preventing battery drain when my RV is not in use. When the switch is in the "OFF" position, it completely disconnects the battery, which helps preserve battery life and prevent potential electrical issues. This battery switch is an excellent investment. Considering its affordability, ease of installation, and reliability, it offers great value. By helping me preserve my battery life and offering the convenience of easily disconnecting the power, it has saved me from purchasing new batteries.
Top reviews from the United States
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- Reviewed in the United States on March 13, 2025Color: On-OffSize: Battery Switch KitVerified Purchase
- Reviewed in the United States on August 13, 2024Color: 1-2-Both-OffSize: Battery Switch KitVerified Purchase
- Reviewed in the United States on February 22, 2025Color: On-OffSize: Battery SwitchVerified Purchase
I’m beyond pleased with how well it works. The switch itself is well-designed with a clear "ON" and "OFF" indication, and it rotates smoothly with little effort. The switch has a compact size, so it doesn’t take up too much space, which is perfect for installations in tight areas. It’s designed to handle a wide voltage range of 12V to 48V, which makes it versatile for use in many different applications. The wiring process was straightforward, and the switch fit perfectly where I needed it in my vehicle. For anyone familiar with basic electrical work, this is an easy DIY installation. If not, get someone who knows what they are doing. A simple turn of the knob is all it takes for preventing battery drain when my RV is not in use. When the switch is in the "OFF" position, it completely disconnects the battery, which helps preserve battery life and prevent potential electrical issues. This battery switch is an excellent investment. Considering its affordability, ease of installation, and reliability, it offers great value. By helping me preserve my battery life and offering the convenience of easily disconnecting the power, it has saved me from purchasing new batteries.
Images in this review
- Reviewed in the United States on April 30, 2019Color: On-OffSize: Battery SwitchVerified Purchase
You can spend hours or lots of money trying to find every power vampire in your RV. I spent two seasons with my battery always being completely dead when I came back to my RV despite all my attempts to get them all shut off. Then after the second season, my battery would no longer take a charge.
Eliminate pesky power vampires with this sturdy switch.
Reviewed in the United States on April 30, 2019
My RV dealer suggested a cutoff switch and after some investigation, I went with this one. There are other cheaper and simpler options out there but I wanted something convenient, safe, and durable. This switch really fits the bill nicely. It's very well made and uses high-grade plastics. The switch has a very solid feel, it's easy to know if you are switch on or off.
First, there aren't any instructions with this switch, they're mostly here on this page. What you will need to install it is an extra battery cable. There is no polarity with this switch but the manufacturer does suggest installing this switch on the ground (negative) side of the battery as it is safer. This makes sense as any owner's manual or mechanic will tell you to hook up positive first and then negative when installing a battery. When removing one you remove the negative first and then positive, that's in effect what you're doing when you install this switch on the negative side.
It took a while but I managed to find a black, 2 gauge battery cable that worked for me: https://amzn.to/2VGcEJg. This switch requires a 3/8" lug and if you are installing this on an RV or boat your battery probably requires a 3/8" lug as well. Keep this in mind as there are also cables with 5/16" lugs (used with motorcycles and other smaller vehicles), either on both or one end. 18" of length was the perfect size for me as it allowed enough slack to go around the box lid easily.
The kit comes with four hex head bolts, nuts, and a bottom cover. What's not clearly shown is each of the four side panels is removable so you can pick the best one to remove for your application. Using some trial and error I figured out the proper drill bit size to drill my holes for mounting.
I opted to install this switch on the top of my battery box. I started by placing the bare switch (bottom plate removed) on the lid and marking each hole to drill. With what I believe ended up being a 5/16" drill bit I drilled each hole. I then removed the panel opposite the "on" indicator as I wanted the "on" side in front and the cables out the back. I hooked up my extra cable and headed out to the RV.
I then made sure the switch was set to "off" and hooked it up to my RVs ground (negative) cable. In the case of my RV this cable is white and you can clearly see it attached to the frame to ground it. With all that done and making sure my switch is still set to "off", I attached the other end of my extra cable to the battery's negative terminal. With the switch off you won't see any sparks when you do this.
At this point, I replaced the bottom cover to have some extra weatherproofing as the bolts easily extend well beyond it. I tightened down the bolts to the lid using the standard hex "star" bit that came with my drill/driver set and holding the nut inside the lid with a ratchet. With that done you're ready to re-attach your lid to your battery box and give it a try.
Some photos from the manufacturer show a way of installing the switch INSIDE your battery box. There's no template provided for this so you would have to figure out the size of the hole to make for the switch. This probably is more weatherproof and while I do have a Rotozip (you could also use a hole saw drill bit if you figure out the right size) I wasn't sure I had enough room with my battery and thought this was overkill.
You could also attach this to the side of the top of the lid with the cables coming out the bottom. With this method though I figured water would be more likely to get in being kicked up from the road or off my truck's tires. So I decided on top with the cables coming out the back was the best option. You could probably use silicone to seal it if you wanted to, I may do that, but that's probably overkill as well.
IN USE
In use this switch is simple, turn the switch on and there's power to your RV, you also need it on to charge your battery if your RV is hooked up to power or your tow vehicle. I flip it on when I come back to my RV.
Once you are going to put your RV in short or long-term storage, switch it off and your days of searching for power vampires or coming back to a dead battery are over. Hopefully, my new battery will last more than two seasons now.
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Top reviews from other countries
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Juan RicaldeReviewed in Mexico on May 21, 2024
faltan piezas
Color: On-OffSize: Battery SwitchVerified Purchase - thakkar vatsalReviewed in India on February 27, 2025
Good quality product
Color: On-OffSize: Battery SwitchVerified Purchase - MarkReviewed in Canada on September 15, 2021
Good, solid battery isolation switch.
Color: On-OffSize: Battery SwitchVerified Purchase
I bought this to prevent small current drains from killing the battery on my 25ft travel trailer while it was in storage. Much easier than disconnecting a battery lead each time!MarkGood, solid battery isolation switch.
Reviewed in Canada on September 15, 2021
The switch is a good, heavy duty design. I wanted to mount it so that I could shut off the battery power from the outside of the battery box. I didn't know if the supplied mounting screws would be long enough. Happily they are. I have a group 27 battery box with a group 24 battery. There was easily enough room to fit the switch inside the box and still fit the battery. The switch fit perfectly through a 2" hole and the supplied screws were long enough to secure it. I used 4 stainless steel washers from the local hardware store to complete the installation. A bead of silicon secured the back cover of the switch to make a nice, waterproof installation.
One safety note. If using this on a trailer, it should be in the "off" position ONLY when the trailer is being stored! If you attempt to tow the trailer with it "off" position, two bad things can happen:
1. Your tow vehicle can't charge your trailer battery.
2. In the event of a trailer separation, the trailer brakes will not come on.
Images in this review
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Christian S.Reviewed in Germany on June 7, 2024
Hielt nur ein Jahr
Color: On-OffSize: High CurrentVerified Purchase - Roger HawkesReviewed in the United Kingdom on January 30, 2023
Purfect
Color: On-OffSize: Battery SwitchVerified Purchase
