Quick Summary
The Heart Horse 12V 140A Split Charge Relay is a dual battery isolator for conventional 12V charging systems. It joins the starter and auxiliary batteries while charging voltage is present, then separates them when voltage falls. The unit also includes a digital voltage display and manual control mode.
The stated cut-in point is about 13.3V and the cut-out point is about 12.8V. The housing is rated IP68. Check the charging system, battery chemistry, cable size and fuse requirements before choosing this product.
Key Details
| Detail | Verified information and buyer relevance |
|---|---|
| Product type | Split charge relay and dual battery isolator for 12V systems. |
| Current rating | 140A, which is the stated relay rating for this model. |
| Voltage display | Built-in digital display for checking system voltage during installation and use. |
| Control modes | Automatic voltage-sensitive operation and manual control mode. |
| Cut-in voltage | Approximately 13.3V. |
| Cut-out voltage | Approximately 12.8V. |
| Protection rating | IP68 housing. |
| Battery note | Ternary lithium batteries cannot be used. |
What to Compare Before Buying
- Charging system type: This relay is described for conventional 12V alternator dual-battery systems. Check that your vehicle or boat uses the same type of charging setup.
- Battery chemistry: Ternary lithium batteries cannot be used, so compare the battery type in your system before buying.
- Current rating: The relay is rated at 140A. Compare that figure with the demands of your installation.
- Installation requirements: Cable size and fuse requirements need checking before fitting, as these affect compatibility and the final setup.
- Control style: Decide whether you want voltage-sensitive automatic operation, manual control, or both in one unit.
Compatibility, Size and Fit
This isolator is intended for compatible conventional 12V alternator dual-battery systems in campervans, motorhomes, 4x4s, trucks and boats. The key checks are the charging system type, battery chemistry, cable size and fuse arrangement rather than vehicle appearance alone.
What Else You May Need
You may need suitable cable and the correct fuse setup for your installation. Check those items against the requirements of the vehicle or boat before fitting the relay.
Before You Decide
Confirm that your system is a conventional 12V alternator setup, check that the battery chemistry is suitable, and compare the 140A rating with your installation needs. Also make sure the cable size and fuse requirements are right for the exact vehicle or boat.
