Lithium & Voltage Sensitive Relay
Printed From: myHanse.com
Category: Hints & Tips
Forum Name: 385/388
Forum Description: 385/388 Hints, Tips and News
URL: https://www.myhanse.com/forum_posts.asp?TID=15390
Printed Date: 26 March 2026 at 23:37
Software Version: Web Wiz Forums 12.06 - https://www.webwizforums.com
Topic: Lithium & Voltage Sensitive Relay
Posted By: Bpabailey
Subject: Lithium & Voltage Sensitive Relay
Date Posted: 09 October 2025 at 19:52
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I'm installing lithium on my boat and was wondering if anyone knows where the VSR is on the 388 so i can disconnect it. Thank you
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Replies:
Posted By: paulmw
Date Posted: 09 October 2025 at 23:44
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On my 388 it was directly above the batteries.
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Posted By: Bpabailey
Date Posted: 09 October 2025 at 23:47
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Thank you. I’ll look there.
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Posted By: jeb
Date Posted: 10 October 2025 at 07:35
What are you planning to replace it with, a DCDC? From what I know the 388 has the Volvo engine with the 115A Mitsubishi Alternator. As long as the cables are correct size (min 35mm2, better 50 mm2) this is perfectly fine to charge LFP. Using a DCDC is in this case a expensive way to limit charging. However, most VSRs have cut in/cut out for FLA. I'm using a Victron Cyrix Li CT in my installation (optimized for LFP). Also the Mastervolt Charge Mate Pro will do the job since it's blocking current from LFP back to FLA.
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Jesper
Hanse 400e
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Posted By: Bpabailey
Date Posted: 11 October 2025 at 05:21
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I do plan on using an orion DC to DC charger. I'll look into that. thanks.
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Posted By: paulmw
Date Posted: 11 October 2025 at 18:41
This can be a surprisingly complex topic! As you mention DC/DC charger I assume you have an AGM starter and LiFePO4 house bank. There are two main paths.
First, alternator charges starter, DC-DC converter charges house bank. Advantage: Relatively easy to install - no (few) new cables. Disadvantage: alternator output to house bank limited by DC/DC charger, topically 50a (unless you have multiple DC/DC chargers!).
Best path: Alternator charges house bank; DC/DC charges starter. Advantage: Can take full advantage of alternator output. Disadvantage: Additional cabling, you'll need an external voltage regulator on alternator (Zeus, Wakespeed, or maybe Balmar) to prevent the LiFePO4 from overheating/destroying your alternator.
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