New NAC-3 Autopilot Computer - Circuit Breaker

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   Hi. I've had a NAC-3 AC installed. But, with a max countiuous output of 30amps it was tripping the 15A circuit breaker on the standard Calira Sealine 331 panel.
A technician has installed a direct cable from the battery to a new switch on the panel, with a 30A fuse inline next to the battery.

Whilst this works, I don't like it because the cable bypasses the Battery Monitor and I'd prefer to use a circuit breaker if possible.

Has anyone encountered a similar issue with the NAC-3 and found a better way of connecting it?

Many thanks.

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Mark Pullen Members Profile Send Private Message Find Members Posts Add to Buddy List Commander Joined: 20 July 2022 Location: London, UK Status: Offline Points: 90	Post Options Post Reply Quote Mark Pullen Report Post Thanks(0) Quote Reply Topic: New NAC-3 Autopilot Computer - Circuit Breaker Posted: 03 June 2025 at 20:07
	Hi. I've had a NAC-3 AC installed. But, with a max countiuous output of 30amps it was tripping the 15A circuit breaker on the standard Calira Sealine 331 panel. A technician has installed a direct cable from the battery to a new switch on the panel, with a 30A fuse inline next to the battery. Whilst this works, I don't like it because the cable bypasses the Battery Monitor and I'd prefer to use a circuit breaker if possible. Has anyone encountered a similar issue with the NAC-3 and found a better way of connecting it? Many thanks.
	Mark

Arcadia Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 27 November 2017 Location: Sag Harbor, USA Status: Offline Points: 1112	Post Options Post Reply Quote Arcadia Report Post Thanks(0) Quote Reply Posted: 03 June 2025 at 20:32
	I’m not sure in what way this would bypass your “battery monitor”. Amperage is usually measured on the negative buss using a shunt and voltage is measure off the positive at the panel of the battery. The install done seems good to me.
	Leon / ARCADIA 2018 Hanse 588 Sag Harbor, NY

Mark Pullen Members Profile Send Private Message Find Members Posts Add to Buddy List Commander Joined: 20 July 2022 Location: London, UK Status: Offline Points: 90	Post Options Post Reply Quote Mark Pullen Report Post Thanks(0) Quote Reply Posted: 04 June 2025 at 08:19
	You are right. I'm not on the boat, but in a photo the shunt is on the negative.
	Mark



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