--- product_id: 130635207 title: "Dual Battery Smart Isolator,12V 140A Dual Battery Isolator Voltage Sensitive Relay & Wiring Cable Kit for ATV, UTV, Boats, RV's" brand: "wonvon" price: "FREE" currency: TND in_stock: false reviews_count: 8 url: https://www.desertcart.tn/products/130635207-dual-battery-smart-isolator-12v-140a-dual-battery-isolator-voltage store_origin: TN region: Tunisia --- # Dual Battery Smart Isolator,12V 140A Dual Battery Isolator Voltage Sensitive Relay & Wiring Cable Kit for ATV, UTV, Boats, RV's **Brand:** wonvon **Price:** FREE **Availability:** ❌ Out of Stock ## Quick Answers - **What is this?** Dual Battery Smart Isolator,12V 140A Dual Battery Isolator Voltage Sensitive Relay & Wiring Cable Kit for ATV, UTV, Boats, RV's by wonvon - **How much does it cost?** FREE with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/130635207-dual-battery-smart-isolator-12v-140a-dual-battery-isolator-voltage) ## Best For - wonvon enthusiasts ## Why This Product - Trusted wonvon brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description Product Features: Automatically combines two batteries when charging and isolates the two batteries when not charging. No voltage drops comparing to battery isolator diodes (0.6V). Meets ISO8846 Ignition Protection, suitable for use in engine room. Robust Glass Fiber reinforced Nylon enclosure. Built-in LED indication (ON when VSR engages). Port for remote LED indicating VSR status (LED not included). Surface or panel mount options provides flexibility when installing. Optional Storage Mode allows zero power consumption when engine is of. Product Specifications： Material: Nylon Color: Black Nominal Voltage | DC 12V Combine Voltage | DC 13.3V Open Voltage | DC 12.8V Continuous Rating | DC 125A intermittent Rating | DC 140A Power Consumption | 10mA (Standby)/ 330mA(Engage) / 0mA (Storage) Terminal Studs | M6(1/4”) Notes | ISO8846/SAE J1171 (Ignition Protected) Certification: CE IP67 Package Includes: 1 x VSR (Voltage Sensitive Relay) with mounting screws 1 x 6 meter red cable terminated at both ends 1 x 600mm black earth cable 2 x Positive marine battery terminals 1 x Negative marine battery terminal 2 x SC16-8 copper crimp lugs (for red cable) 1 x SC25-8 copper crimp lugs (for black cable) 2 x Red heat shrink 6 x 200mm cable ties 1 x Instruction manual ## Features - About this item - FEATURES:Robust Glass Fiber reinforced Nylon enclosure.Meets ISO8846 Ignition Protection, suitable for use in engine room. AUTOMATICALLY CONTRILLED SWITCHES:Voltage Sensitive Relay are automatically controlled switches that allow two batteries to be combined when charging, and to be isolated when not charging. It can charge two batteries, once your main starter battery is sufficiently charged, it will begin charging the second battery too from your alternator;Built-in LED indication (ON when VSR engages). EASY TO INSTALL:This voltage sensitive relay is best suited for your dual-battery vehicle starting. There are two ways to install it.Surface or panel mount options provides flexibility when installing. VOLTAGE SENSITIVE RELAY:The voltage sensitive relay helps to reserve a fully charged battery at all time, avoid the dead battery and possibility of towing on the sea. This Kit provides all the necessary cables,accessories and the VSR that you need to install the secondary battery with the voltage sensitive rela. TIPS:After the engine stalls, the left House battery discharges to the upper left load device, and the VSR disconnects when the battery voltage drops below 12.8V. The Start Battery on the right will not discharge to the device. When the battery on your left is not charging, it is used up. At least there is a little battery on the right that allows you to start the engine. ›See more product details ## Images ![Dual Battery Smart Isolator,12V 140A Dual Battery Isolator Voltage Sensitive Relay & Wiring Cable Kit for ATV, UTV, Boats, RV's - Image 1](https://m.media-amazon.com/images/I/71T+RCvsZ4L.jpg) ![Dual Battery Smart Isolator,12V 140A Dual Battery Isolator Voltage Sensitive Relay & Wiring Cable Kit for ATV, UTV, Boats, RV's - Image 2](https://m.media-amazon.com/images/I/612lBqU900L.jpg) ![Dual Battery Smart Isolator,12V 140A Dual Battery Isolator Voltage Sensitive Relay & Wiring Cable Kit for ATV, UTV, Boats, RV's - Image 3](https://m.media-amazon.com/images/I/71ubArQwCQL.jpg) ![Dual Battery Smart Isolator,12V 140A Dual Battery Isolator Voltage Sensitive Relay & Wiring Cable Kit for ATV, UTV, Boats, RV's - Image 4](https://m.media-amazon.com/images/I/71Y5C1BnIKL.jpg) ![Dual Battery Smart Isolator,12V 140A Dual Battery Isolator Voltage Sensitive Relay & Wiring Cable Kit for ATV, UTV, Boats, RV's - Image 5](https://m.media-amazon.com/images/I/71Y1K+RSGcL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Simple and effective. *by J***S on Reviewed in the United States on July 7, 2019* Works really well and has a long enough power wire to reach the back of the truck from the front. Vsr shuts off right at 12.8 as described. ### ⭐ 0.7 Voltage Drop *by J***D on Reviewed in the United States on August 10, 2020* This is a nice kit and has all the part to install however there is a major problem. The second battery never is able to charge as there is a .7 voltage drop from the internal diode which causes the unit to disconnect after a few seconds and direct charge back to battery one. ### ⭐⭐⭐⭐⭐ Easy way to run dual batteries. *by N***S on Reviewed in the United States on July 15, 2019* This product makes setting up dual batteries in my truck super easy. Kit comes with more than enough wire to mount in the bed of a truck. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/130635207-dual-battery-smart-isolator-12v-140a-dual-battery-isolator-voltage](https://www.desertcart.tn/products/130635207-dual-battery-smart-isolator-12v-140a-dual-battery-isolator-voltage) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-06-01*