No 12v systems work

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   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.

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Lhsrris218 Members Profile Send Private Message Find Members Posts Add to Buddy List Commander Joined: 26 September 2021 Status: Offline Points: 108	Post Options Post Reply Quote Lhsrris218 Report Post Thanks(0) Quote Reply Topic: No 12v systems work 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.

marsella Members Profile Send Private Message Find Members Posts Add to Buddy List Rear Admiral Joined: 21 June 2022 Location: Antigua Jolly H Status: Offline Points: 592	Post Options Post Reply Quote marsella Report Post Thanks(0) Quote Reply 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

Lhsrris218 Members Profile Send Private Message Find Members Posts Add to Buddy List Commander Joined: 26 September 2021 Status: Offline Points: 108	Post Options Post Reply Quote Lhsrris218 Report Post Thanks(0) Quote Reply 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!!

mr-ludi Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 25 September 2022 Status: Offline Points: 152	Post Options Post Reply Quote mr-ludi Report Post Thanks(0) Quote Reply Posted: 16 December 2024 at 18:06
	It‘s called „Latching Relay“ on page 10 of documentation.

Lhsrris218 Members Profile Send Private Message Find Members Posts Add to Buddy List Commander Joined: 26 September 2021 Status: Offline Points: 108	Post Options Post Reply Quote Lhsrris218 Report Post Thanks(0) Quote Reply 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

landlocked Members Profile Send Private Message Find Members Posts Add to Buddy List Rear Admiral Joined: 12 April 2005 Location: Canada Status: Offline Points: 568	Post Options Post Reply Quote landlocked Report Post Thanks(0) Quote Reply 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

marsella Members Profile Send Private Message Find Members Posts Add to Buddy List Rear Admiral Joined: 21 June 2022 Location: Antigua Jolly H Status: Offline Points: 592	Post Options Post Reply Quote marsella Report Post Thanks(0) Quote Reply 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.

mr-ludi Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 25 September 2022 Status: Offline Points: 152	Post Options Post Reply Quote mr-ludi Report Post Thanks(0) Quote Reply 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

marsella Members Profile Send Private Message Find Members Posts Add to Buddy List Rear Admiral Joined: 21 June 2022 Location: Antigua Jolly H Status: Offline Points: 592	Post Options Post Reply Quote marsella Report Post Thanks(0) Quote Reply 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?

mr-ludi Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 25 September 2022 Status: Offline Points: 152	Post Options Post Reply Quote mr-ludi Report Post Thanks(0) Quote Reply 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 It can be reseted by the yellow head on top.



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