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Stinger SGP38 80-AMP Battery Isolator and Relay,BLACK

4.7 out of 5 stars 926 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Automotive Replacement Battery Switches by STINGER

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Battery Isolator
Standard Packaging

Enhance your purchase

  • 80 AMP Battery Isolator and Relay
  • Prevents primary battery discharge.80A constant 150A peak
  • Maximum current transfer
  • Extends battery life
  • Universal 12V Applications
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  • Stinger SGP38 80-AMP Battery Isolator and Relay,BLACK
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  • True UTV-SBI-CM UTV Dual Battery Connect & Monitor Kit
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  • ODYSSEY PC925 Automotive and LTV Battery
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Customer Rating 4.7 out of 5 stars (926) 4.6 out of 5 stars (211) 4.7 out of 5 stars (3974) 4.3 out of 5 stars (92) 4.6 out of 5 stars (58) 4.7 out of 5 stars (194)
Price $22.50 $23.99 $14.97 $28.99 $32.99 $79.95
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Sold By Gilded Inc. GenLife Ampper Direct AUBEI LTD AOPEC JayCorp Automotive

Product description

Style:Battery Isolator  |  Product Packaging:Standard Packaging

Ideal for battery isolation, Stinger's high current relays are the most reliable and efficient way to add secondary batteries to your system. Compatible with all types of alternators and charging systems, simply connect these relays to operate when the ignition is turned on. The battery systems remain separate while the ignition is off, preventing system drain. Water resistant black phenolic plastic, 100,000 mechanical cycle life.

Product information

Style:Battery Isolator  |  Product Packaging:Standard Packaging

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Legal Disclaimer

This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.


Customer Questions & Answers

Customer reviews

4.7 out of 5 stars
4.7 out of 5
926 global ratings
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Top reviews from the United States

Reviewed in the United States on April 26, 2019
Style: Battery IsolatorProduct Packaging: Standard PackagingVerified Purchase
Customer image
3.0 out of 5 stars Runs hot - even without load current
By Luv2Ski on April 26, 2019
There's precious little specification-wise on this contactor. The contactor is rated for 80A continuous. However, there's no information about power factor requirements - if any - for the loads. It's really just a heavy duty SPST relay, not a true battery isolator. It doesn't monitor battery voltage and cut off the loads before the battery falls below a level that would compromise it. By the way, here is a combiner/isolator that does actually prevent battery damage from over-discharging: https://www.amazon.com/Victron-Intelligent-Battery-Combiner-Cyrix-ct/dp/B0738JGVZ9

That brings us to another piece of missing information - the steady state current draw on the coil. That number I can measure on my bench power supply. When the contactor is at room temperature and is activated with a typical automotive voltage of 13.5v dc, it draws nearly 500 mA - about 6-1/2 watts. That seems high so I decided to see if just the coil current alone would heat up the relay. It did. By 100 degrees Fahrenheit !! In the second photo the relay body is running a cozy 168 degrees F (75.6 degrees C). Remember, there is no current flowing on the main contacts which would add even more heat.

This device was rated pretty well here on Amazon and should work fine for intermittent duty like switching a small starter motor. As a continuous duty load disconnect relay, not so much. It's going back to Amazon. Three stars for the utter lack of specifications.
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41 people found this helpful
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Reviewed in the United States on October 30, 2019
Style: Battery IsolatorProduct Packaging: Standard PackagingVerified Purchase
5 people found this helpful
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Reviewed in the United States on November 27, 2018
Style: Battery IsolatorProduct Packaging: Standard PackagingVerified Purchase
12 people found this helpful
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Reviewed in the United States on April 9, 2018
Style: Battery IsolatorProduct Packaging: Standard PackagingVerified Purchase
7 people found this helpful
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Reviewed in the United States on April 26, 2020
Style: Battery IsolatorProduct Packaging: Standard PackagingVerified Purchase
5 people found this helpful
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Reviewed in the United States on October 13, 2016
Style: Battery IsolatorProduct Packaging: Standard PackagingVerified Purchase
8 people found this helpful
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Reviewed in the United States on June 22, 2021
Style: Battery IsolatorProduct Packaging: Standard PackagingVerified Purchase
Reviewed in the United States on March 19, 2020
Style: Battery IsolatorProduct Packaging: Standard PackagingVerified Purchase
One person found this helpful
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Top reviews from other countries

mike jaworski
5.0 out of 5 stars Tested it with the key on and off and no battery drain on Main battery
Reviewed in Canada on July 21, 2020
Style: Battery IsolatorProduct Packaging: Standard PackagingVerified Purchase
2 people found this helpful
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evo
5.0 out of 5 stars Well built component. Recommended.
Reviewed in Canada on September 29, 2019
Style: Battery IsolatorProduct Packaging: Standard PackagingVerified Purchase
2 people found this helpful
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Mario
4.0 out of 5 stars Trennrelais
Reviewed in Germany on December 14, 2015
Style: Battery IsolatorProduct Packaging: Standard PackagingVerified Purchase
2 people found this helpful
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Anon
5.0 out of 5 stars Good
Reviewed in Canada on August 21, 2020
Style: Battery IsolatorProduct Packaging: Standard PackagingVerified Purchase
One person found this helpful
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Amazon Customer
5.0 out of 5 stars Battery isolator relay
Reviewed in Canada on July 22, 2021
Style: Battery IsolatorProduct Packaging: Standard PackagingVerified Purchase
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