350 - New NAC-3 Autopilot Computer

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New NAC-3 Autopilot Computer - Circuit Breaker

Printed From: myHanse.com
Category: Hints & Tips
Forum Name: 350
Forum Description: 350 Hints and Tips
URL: https://www.myhanse.com/forum_posts.asp?TID=15165
Printed Date: 26 March 2026 at 23:38
Software Version: Web Wiz Forums 12.06 - https://www.webwizforums.com

Topic: New NAC-3 Autopilot Computer - Circuit Breaker

Posted By: Mark Pullen
Subject: New NAC-3 Autopilot Computer - Circuit Breaker
Date 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.

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Mark

Replies:

Posted By: Arcadia
Date 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.

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Leon / ARCADIA
2018 Hanse 588
Sag Harbor, NY

Posted By: Mark Pullen
Date 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.

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Mark