Battery Settings in case of extended abscence

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   Hi everyone,

As a new Hanse 510 owner, I need your valuable help.

Our boat is moored in a marina in Croatia where connecting to a 220V power supply is prohibited during extended absences. We haven't installed photovoltaics yet.

When we're away from the boat for an extended period, the battery naturally discharges. I can track this using the Sentinel app. Below a certain voltage, the BlueSea ML-RBS Remote Battery Switch disconnects the on-board power supply from the battery to prevent it from becoming deeply discharged.

This usually works well – but not this time. Somehow, the Simarine control panel didn't report the SOC, so the Remote Battery Switch didn't trigger. The battery only has a voltage of 10.2V, and I'm allowed to go to Croatia to charge the battery this weekend.

My question is how do I leave the Hanse 510 without a power supply during an extended absence? Should I manually trigger the RBS right away? Or should I just unscrew the red fuses? Should the Simarine panel stay on? Will the Sentinel app still work then?

I would be very grateful if you could give me some tips.

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
SY Solstralen Members Profile Send Private Message Find Members Posts Add to Buddy List Sub Lieutenant Joined: 17 August 2025 Status: Offline Points: 3	Post Options Post Reply Quote SY Solstralen Report Post Thanks(0) Quote Reply Topic: Battery Settings in case of extended abscence Posted: 17 August 2025 at 20:29
	Hi everyone, As a new Hanse 510 owner, I need your valuable help. Our boat is moored in a marina in Croatia where connecting to a 220V power supply is prohibited during extended absences. We haven't installed photovoltaics yet. When we're away from the boat for an extended period, the battery naturally discharges. I can track this using the Sentinel app. Below a certain voltage, the BlueSea ML-RBS Remote Battery Switch disconnects the on-board power supply from the battery to prevent it from becoming deeply discharged. This usually works well – but not this time. Somehow, the Simarine control panel didn't report the SOC, so the Remote Battery Switch didn't trigger. The battery only has a voltage of 10.2V, and I'm allowed to go to Croatia to charge the battery this weekend. My question is how do I leave the Hanse 510 without a power supply during an extended absence? Should I manually trigger the RBS right away? Or should I just unscrew the red fuses? Should the Simarine panel stay on? Will the Sentinel app still work then? I would be very grateful if you could give me some tips.

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 August 2025 at 00:59
	If you are not certain about the electricals in your boat, the simple way to disconnect everything from the battery is to unscrew the battery cable from positive terminal. The Sentinel will not work as everything else. The natural discharge is extremely slow, my boat doesnt stay idle for more than 4 months, but we routinely leave our car in a vacation house for 10 months in a year, and with disconnected battery never a problem to start it back.

Keakaka Members Profile Send Private Message Find Members Posts Add to Buddy List Commander Joined: 02 August 2020 Location: New Zealand Status: Offline Points: 85	Post Options Post Reply Quote Keakaka Report Post Thanks(0) Quote Reply Posted: 26 August 2025 at 01:03
	Hi I have a two year old 460 and have experienced major battery problems also. I suggest you set up a small solar charger so you can keep Sentinel and the Bilge pump working when you are away. The Sentinel will advise you if the bilge pump activates. My experience is that the three AGM batteries have failed after only 18 months use. A very low voltage could cause your battery to fail.
	This is not a rehearsal. Go for it. Kiakaha

ariette Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 12 August 2013 Location: med Status: Offline Points: 202	Post Options Post Reply Quote ariette Report Post Thanks(0) Quote Reply Posted: 26 August 2025 at 15:09
	I have experienced similar issues with my 460. A permanently wired winter solar panel- mine is a 200watt suitcase type tied flat in the cockpit- seems to keep everything stable. on the 460 the main drain (with everything switched off) seems to be the two B2B chargers on the thrusters. I have located the fuses and pulled those out to reduce drain. Even so there seems to be a drain of around 0.9amps so a solar solution is required especially for winter storage.

kipwrite Members Profile Send Private Message Find Members Posts Add to Buddy List Commadore Joined: 14 October 2015 Location: New York Status: Offline Points: 495	Post Options Post Reply Quote kipwrite Report Post Thanks(0) Quote Reply Posted: 27 August 2025 at 01:23
	I'm not sure this will be helpful, but I've located the following 'phantom' draws on my 505, from 2016, which will continue to discharge the battery even though the on-off switches are set to off, as follows: - vhf radio/handheld charger - bilge pump(s) - 3 shower sumps In prior years, before I added solar, during layup I simply removed the fuses for these items and turned off all switches at the batteries. Batteries remained happy. Edited by kipwrite - 27 August 2025 at 01:24
	Kipwrite

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: 27 August 2025 at 07:57
	I have investigated the settings for extended absence a lot at my 460. I think it will be the same at the 510. Even if you switch the main battery switch off (not only the Simarine panel) the boat still needs 2,9A which is 70Ah a day. The Mastervolt DC/DC Magic Power, which powers the mobile Yacht Router, needs 0,7A = 17Ah including the Yacht Router. My charging hardware from Mastervolt needs another 0,4A = 10Ah to keep the network allive, even if not charging. Other components using energy are: - VHF - Bilge Pump - Gas detection - Security cam - DC/DC Charger for thrusters - BlueSea Remote Battery Switch - Emergency lights - Engine fan relais If you want to use less than 2,9A = 70Ah a day, you have to start removing fuses or adding photovoltaic. I have 880Wp on my 460. Last winter the boat was moored at Med/France. I still had to connect shore power two times during the winter, to keep the SOC above my limit.

S&J Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 30 August 2014 Location: Perth WA / Med Status: Offline Points: 1371	Post Options Post Reply Quote S&J Report Post Thanks(0) Quote Reply Posted: 27 August 2025 at 12:17
	I am very surprised that you needed supplementary shore power with a daily load of 70Ah with 800W solar, although I'm also surprised that you have such a high daily load! When I was ashore in Greifswald I used to disconnect the batteries completely for 8 months as advised by the yard there. Always seemed ok. Now I'm in the Ned, also with 800W solar I find my 480Ah bank is fully charged most days in a few hours. There may me one or two cloudy days when I don't reach float, but never below my target 70% SOC. I run one NMEA network for basic transducers, two raspberry pi, one of which is a Victron Venus to monitor batteries, security camera and all the other "permanent" items like VHF, courtesy light, bilge pumps etc I live in AU so I'm not able to get to the boat during the 8 months ashore.
	H458 #159 Primal Mediterranean cruising

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: 27 August 2025 at 12:38
	I'm surprised too... Right now the boat is moored in Spain. The 880Wp photovoltaic do charge about 185Ah a day at the end of August. That's more than enough if the boat system needs 70Ah a day. But during the winter it will be reduced to under 70Ah a day, because of less sunshine and more dirt on the photovoltaic panels. The daily load of 70Ah is also quite high. But you can't compare it to the 458 model. Even disconnecting the batteries completely doesn't help to reduce the load if you want your batteries connected ;-)



Welcome to myHanse.com the forum for Hanse Yachts owners throughout the world.