Description
Motor controllers and inverters have a large, low-ESR capacitor bank on their input. Connecting a battery straight to it causes a current spike that can weld contactors or blow fuses.
The Smart Precharger charges those capacitors through a resistor first, then closes the main contactor automatically once they are charged. It stops the precharge and flags a fault if the voltage does not rise (usually a wiring fault or no pack voltage) or if precharge takes longer than 5 seconds (usually a load on the output side).
Resistor options
- 50 ohm: 12-180V nominal packs
- 100 ohm: 180-360V nominal packs
Specifications
- Supply: 8-18VDC (12V nominal, 3A max)
- Typical precharge time: 1-2 seconds
- Built-in coil spike suppression diode
- Size: 71 x 25 x 18 mm
Built from the open-source ZEVA Smart Precharger (PRECHv1-3) design, released under the MIT License.
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