MaySpare 80-Amp 12V Continuous Duty Solenoid Battery Isolator & Starter Relay – White, 4-Pin SPST
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Description
xOverview
Meet a versatile solenoid battery isolator and starter relay designed to support dual-battery systems with steady 12V DC performance. The MaySpare unit operates as a normally open switch, enabling controlled engagement between power sources while preserving engine start reliability. Built for continuous duty, this 80-amp device handles everyday demand with a robust 500-amp surge capability and a 2000W switching capacity, making it suitable for RV, marine, and off-road setups.
Key specifications at a glance
- Continuous amperage: 80 A
- Surge max amperage: 500 A
- Voltage: 12V DC
- Electrical life: up to 100,000 mechanical cycles
- Contact type: Copper contact with silver pins
- Max switching current: 500 A at 5 ms; max switching power: 2000 W
- Normally Open configuration with attached hardware
What’s included and how it helps
- 4 large 100A terminals wired for loading and 4 small terminals for original power connections
- 4 insulated red caps to protect connections and edges
- Durable white housing designed for visibility and long-term reliability
- Easy replacement path via compatible units (White Rodgers, Cummins part numbers listed on request)
Real-world use cases
Ideal for vehicles or vessels that rely on a secondary battery for accessories, lights, or auxiliary systems while keeping primary starting power separate. The normally open configuration means you can control when the auxiliary system receives charge, reducing risk to starting performance during demanding starts or cold conditions. This is a practical option for DIY installers upgrading dual-battery layouts, as well as professional setups where dependable, fast-switching isolation is valuable.
Installation notes and operating guidance
The kit includes wires and terminals to connect to both the loading circuit and the original power line. It emphasizes a constant voltage approach, with the working cycle suitable for periods of continuous use before a brief pause. Users should follow proper wiring practices to ensure solid connections and secure mounting. If you have questions about compatibility with your specific battery setup, contact the MaySpare support team for guidance.
Why choose MaySpare
MaySpare combines durable materials, copper contact with silver pins, and a high-cycle design to support regular, real-world use. The 80A continuous rating paired with a 500A surge capability provides a broad margin for fluctuating loads, while the compact 12V DC footprint fits a variety of installations without demanding more space than necessary. This makes it a practical accessory for upgrading power systems where reliable isolation and quick switching matter, without guaranteeing outcomes—only presenting a clear set of capabilities you can leverage.
FAQ
Q: What is the MaySpare 80-Amp Solenoid Battery Isolator used for?
A: It enables independent charging of a second battery and safe engine starting by isolating circuits.
Q: Does it require constant voltage and how long can it run?
A: It operates on 12V DC; continuous use is practical for several hours before a cooldown.
Shipping & Return
xReturns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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