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Stinger SGP38 80-AMP Battery Isolator and Relay
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- 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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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.
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weight: 0.45 lb
height: 3 in
mounting footprint: 2 1/8 in x 2 7/8 in
control terminals: 8 mm
power terminals: 14 mm
As it turns out, I have a spot on my engine firewall large enough to accommodate this device and also get to it with a socket wrench. Your engine compartment may not be so forgiving. Also, since I do not want to have both my starting battery and auxiliary battery in parallel whenever I turn the key to start the car, I have added a switch to the center console (in place of a coin holder near seat heater switches) sourced from a circuit (20 amp fused passenger seat heater) that is only hot when the ignition key is switched ON/ACC that will energize the solenoid at my command after the car is running . I fused this circuit with a 5 amp fuse to accommodate the ~3.5 amp momentary surge current when the solenoid energizes (see diagrams below). I bench-tested the SGP38 and it operates fine with a very solid 'clunk' sound. Looking forward to years of trouble-free performance.
UPDATE Feb 2017. This relay continues to perform flawlessly. (I should perform so well and last so long...) In fairness, I did not mount this relay in the engine compartment, but instead opted to mount it under the passenger-side dash. I doubt, however, if the elements would affect its performance.
So my RV fridge and accessories drain my start battery down and sometimes it won't start.
This relay was easy to install, is very well made, and solved my start issue when towing my RV trailer.