Stinger SGP35 High Current Battery Relay & Isolator — 500A, Marine & Powersports

The STINGER SGP35 High Current Battery Relay & Isolator is designed to give you reliable power control for secondary battery setups across cars, boats, and off-road vehicles. Built from water-resistant phenolic plastic, it stands up to marine spray, dust, and rugged environments while remaining compact enough to fit in tight spaces. With an impressive 100,000 mechanical cycle life and a 500A contact rating (up to 900A surge), this unit is engineered to handle demanding electrical needs with ease. Its operation is tied to the ignition, so the secondary battery system can power accessories when you need it and stay isolated when you don’t, helping reduce unwanted drain while you’re away from the vehicle.

Key capabilities

• Universal 12V compatibility: works with any vehicle alternator or charging system.
• Water-resistant construction: phenolic plastic protects against moisture in marine, powersports, or off-road use.
• Maximum current transfer: supports up to 500A continuous and up to 900A surges for peak demands.
• Ideal for secondary battery isolation: keeps primary battery from unnecessary discharge while powering accessories.
• Long service life: rated for up to 100,000 mechanical cycles.

Why this matters for your setup

• Ignition-tied operation: the relay engages when the ignition is on, delivering power on demand for your auxiliary systems.
• Automatic isolation when off: your main system remains protected from drain, even when multiple devices are connected.
• Versatile compatibility: seamless integration with a wide range of charging systems and vehicle types.

Real-world uses and benefits

Whether you’re installing a high-powered car audio setup, adding marine electronics, or equipping a powersport rig, the SGP35 offers a practical, reliable pathway for auxiliary power. The compact, rugged design fits in engine bays or compartments where space is at a premium, while the moisture-resistant construction helps it endure spray and humidity near water.

Expect a tidy power strategy: you gain an efficient means to run secondary devices without risking the primary battery, and you retain control with ignition-based operation. Think of it as a smart power bridge that adapts to sudden demand without forcing you to rewire or juggle multiple fuses.