Question: Is a JST connector safe for 3S packs on small RC planes?
Answer: JST connectors, especially the common JST-RCY type, are generally rated for around 3 to 5 amps continuous current. For a 3S LiPo pack powering a small RC plane, this might be borderline or insufficient depending on your motor and ESC setup. If your motor draws low current (under 5A), a JST connector can be safe. However, for typical 3S setups where currents can exceed 10A, JST connectors risk overheating and potential failure.
For safety and reliability, consider these steps: 1) Check your ESC and motor current draw under load using a wattmeter. 2) If currents exceed 5A, upgrade to connectors rated for higher current, such as XT30 or Deans plugs. 3) Ensure all solder joints are solid and wires are appropriately thick (e.g., 20–22 AWG or thicker). 4) Regularly inspect connectors for heat damage or wear. Using the right connector reduces the risk of voltage drops, heat build-up, and potential fire hazards, keeping your flights safe and enjoyable.
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