460 - No 12v systems work

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No 12v systems work

Printed From: myHanse.com
Category: Hints & Tips
Forum Name: 460
Forum Description: Model Hints, Tips and News
URL: https://www.myhanse.com/forum_posts.asp?TID=14926
Printed Date: 27 March 2026 at 03:40
Software Version: Web Wiz Forums 12.06 - https://www.webwizforums.com

Topic: No 12v systems work

Posted By: Lhsrris218
Subject: No 12v systems work
Date Posted: 15 December 2024 at 20:25

Hi. Went to the boat today and looks like the shore power cable was loose. Reconnected and then noticed simarine panel was dead, fridges off, generator panel not working. Only dc working was bilge pump and vjf.

Shore power working, batteries appear charged no blown fuses.

Checked power to the dc control.board and at 0. There is 14v across the bus bars.

Battery isolation switches on.

Any ideas?

Is there a breaker between the battery and the power distribution - 50amp.fuse appears.good.

Replies:

Posted By: marsella
Date Posted: 15 December 2024 at 21:30

There should be a fuse between positive busbar and big fat cable going to mainboard, and this cannot be 50Amps, likely 250 Amps.or around it

Posted By: Lhsrris218
Date Posted: 15 December 2024 at 22:54

Turns out there is a black breaker mid cushion area that wasn't on any diagram

All good now!!

Posted By: mr-ludi
Date Posted: 16 December 2024 at 18:06

It‘s called „Latching Relay“ on page 10 of documentation.

Posted By: Lhsrris218
Date Posted: 17 December 2024 at 23:43

So I'm stumped.

This breaker keeps tripping. Overnight on batteries - just fridges and a router operating with inverter on.

Today while sailing it tripped again - just nav instruments, fridges and bow thruster (but wasn't used)

What could be randomly causing a 100 amp breaker to trip?

Thanks

Posted By: landlocked
Date Posted: 18 December 2024 at 00:29

A faulty breaker? Can you replace it? If it isn’t the breaker it’s handy to have a spare anyway.

-------------
"Kerkyra" 400e #042

Posted By: marsella
Date Posted: 18 December 2024 at 00:32

Some device is possibly shorting the circuit, analyze which one is ON in your random cases. Maybe water is in the connecting wires.

Posted By: mr-ludi
Date Posted: 18 December 2024 at 08:12

If you are talking about the „Latching Relay“, than it's not a breaker.

It switches the service circuit off, if the batteries are under a defined SOC.

With the AGM batteries it is defined at 35%.

https://www.bluesea.com/products/category/35/91/Automatic_Charging_Relays/ML-ACRs" rel="nofollow - https://www.bluesea.com/products/category/35/91/Automatic_Charging_Relays/ML-ACRs

Posted By: marsella
Date Posted: 18 December 2024 at 09:15

The bluesea link points to the charging relays, type of battery combiners between house and engine batteries, not sure those act as circuit breakers. So what exactly needs to be reset to restore the power?

Posted By: mr-ludi
Date Posted: 18 December 2024 at 09:55

Sorry, wrong link.

Hanse has installed this one to switch off the service circuit in case of low battteries:

https://www.bluesea.com/products/7700/ML-RBS_Remote_Battery_Switch_with_Manual_Control_-_12V_DC_500A" rel="nofollow - https://www.bluesea.com/products/7700/ML-RBS_Remote_Battery_Switch_with_Manual_Control_-_12V_DC_500A

It can be reseted by the yellow head on top.

Posted By: Lhsrris218
Date Posted: 19 December 2024 at 00:02

Yes. That is the device that needs to be reset.

According to the simarine panel , the house batteries have not gone below 55%.

Is the latching relay programmable?

Posted By: Lhsrris218
Date Posted: 19 December 2024 at 00:11

Actually your link us to a remote battery switch

Do you have a link to the latching relay? Why would they want to disconnect the house bank when low?

Posted By: mr-ludi
Date Posted: 19 December 2024 at 08:07

Blue Sea calls it remote battery switch. Hanse calls it latching relay.

I would call it "remote battery disconnection" because it can only disconnect the circuit by remote. Reconnection can only be made manual.

If you are running batteries at low SOC, they get more or less damaged. Especially AGM batteries. Hanse is trying to avoid a less SOC, by disconnecting the service circuit, but still running safety devices like bilge pumps by permanent circuit.

The signal for disconnecting the service circuit comes from MPC: https://www.mastervolt.com/products/masterbus-interfaces/multipurpose-contact-output/" rel="nofollow - https://www.mastervolt.com/products/masterbus-interfaces/multipurpose-contact-output/

This MPC gets the SOC from the MasterVolt Shunt.

You can change the SOC limit for the MPC signal by configuration the MPC (or Shunt, I forgot) by https://www.mastervolt.com/products/masterbus-interfaces/masterbus-usb-interface/" rel="nofollow - https://www.mastervolt.com/products/masterbus-interfaces/masterbus-usb-interface/

I don't know why your battery was disconnected, even with SOC of >55%.

Maybe there is another/wrong configuration, or your display is showing another SOC than your Masterbus-Network.

I think you can disable the remote disconnection by cutting the orange cable from Blue Sea remote switch to MPC.

Posted By: Lhsrris218
Date Posted: 22 December 2024 at 22:44

Thanks - Makes sense.