🔧 Power Up Your Adventures with Confidence!
The MaySpare Dual Battery Isolator Kit is a robust 12V, 140A solution designed to keep your primary battery charged while allowing accessories to run from a secondary battery. With a smart voltage-sensitive relay that cuts in and out at precise voltages, this kit ensures your vehicle is always ready to go. Ideal for a variety of vehicles, it includes all necessary components for easy installation and is backed by premium customer support.
T**M
Works like a champ!
Got this to add a secondary battery for my truck to charge tools while on the job site and run a few appliances. This worked great!
A**N
Failed after 2 weeks
Failed after two weeks. Had to buy another at an autozone on our road trip
K**R
Exellent quality kit.
Great kit I installed a second 100 amp Renogy AGM battery with an inverter and cigarette lighter and USB ports in the back of the canopy on my F150 4wd. Easy to wire, clear instructions.
T**K
Great Product Quality, Easy to Install
This seller makes a great product. All the hardware and wire necessary to install the dual power isolator. Good instructions. I ran the dual power isolator to a AGM power box in the passenger floor area of my Dodge Caravan. Wanted to be able to monitor the isolator and connected a voltage meter to monitor the main battery and auxiliary battery. The gauge of wire is right and everything is working great. I glad I bought this product.
B**T
works with a "smart" or variable alternator
My 2017 subaru outback has a "smart" or variable alternator, and my initial test of this unit showed that the battery voltage constantly dropped under 12.5v while driving around town which caused this unit to do what it's supposed to do and cut power to the aux battery side. Obviously that wasn't going to work with a trailer and aux battery hooked up.The only way to get around the "smart" or variable alternator feature is to TURN ON YOUR PARKING OR DRIVING LIGHTS. This causes the ECU to "turn on" the alternator to provide a constant >14.0 volts to the battery the whole time the engine is running. If you turn your lights off, you'll see the alternator voltage drop to 12.5v or lower.
C**D
Great for van build
Just what I needed for keeping the two house batteries in my van charged. Cable was long enough to get from my starter battery to my house batteries at the back of my extended fullsize van. Smart isolator has performed flawlessly, even when I depleted my house batteries twice, and done numerous rough gravel roads. Solar gets lots of attention but this is WAY more useful.
M**A
Easy Installation
Not a rocket science it does what suppose to do. I went for a 1700 miles trip with clear mind knowing that I had my second battery ready for any inconvenience.
R**R
Unit is dead
Finally got this unit installed. Doesn’t work at all, not even the LED. Unit is completely worthless. I’m outside of the return and support window, so leaving this review is all I can do.
Trustpilot
2 weeks ago
1 day ago
