Sterling Power
Sterling Power APD12 – 12V Alternator Protection Device
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The Sterling Power APD12 protects your alternator from the damaging voltage spikes (load dump) that occur when a battery or a battery-to-battery charger is suddenly disconnected while the alternator is under load. It clamps those transients before they can reach your alternator's diodes and regulator — cheap insurance for an expensive component in any dual-battery or DC-DC install.
Specifications
| Type | Alternator protection device (transient / load-dump suppression) |
|---|---|
| Nominal voltage | 12V |
| Function | Clamps voltage spikes caused by sudden battery or charger disconnection |
| Typical use | Dual-battery, DC-DC, and battery-to-battery charging systems |
| Dimensions | 90 × 90 × 60mm |
| Weight | 0.25kg |
| Clamp rating | Available on the datasheet — contact us to confirm |
| Warranty | 2-year return-to-factory |
Key Features
- Carries no main current itself — only light-gauge wiring is needed to install
- No back-feed occurs through the device
- Works with any alternator or battery-splitting device suitable for 12V or 24V systems
Why It Matters
Alternators hate having their load pulled away suddenly. If a battery isolator opens or a charger drops offline mid-charge, the resulting spike can destroy diodes and regulators. The APD12 gives that energy somewhere safe to go, protecting the alternator across the life of your build.
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