SeaKnots

B43 Battery Switch Questions coming up during my LIFEPO4 Battery Upgrade Process

My AGM batteries are getting a bit tired and I am swapping them out for 400ah of lithium, 2 - 200ah 'drop in' replacements.

My system has the 3000 watt inverter and Truecharge 40+ shore power charger which the boat came with and  I have verified with the battery manufacturer that these will work with the lithium (they said to set the shore power charger to GEL - WARM to get the right charging characteristics). I have also installed solar a few years back so will need to adjust the charging parameters of the Victron MPPT controller and I am installing a new victron DC to DC charger to protect the alternator.

The question I have is on the battery switches. My thought was that all charging sources would be on the "House" side of the switches so you can turn off battery power to the charge sources if needed. Since I see that mine is wired to have charging sources go to the battery side of the positive and negative switches, I have verified that both my new Victron DC charger and Victron MPPT charger controller have internal fuses, so I am a bit more comfortable installing the charging sources on the battery side of the switches.

However, when I had the negative battery switch in the off position, I tested it with the amp meter and noticed that both sides of the switch where grounded to the battery. It seems some dealer installed ground wires go directly to the battery side of the negative switch which may be inadvertently grounding the entire system. 

So 2 questions to the group:

1) is your charger installed on the "battery" side of the switches?

2) Has any one else experienced the Ground Switch issue described above? Any reason to have anything besides the charging & battery ground wires on the battery side of the switch?

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Latest Activity

Mike Brown commented on CAN DRAC's group Beneteau 40 & 43
"Robert glad to hear you go the problem solved. mike"
Oct 11
Robert & Sandy commented on CAN DRAC's group Beneteau 40 & 43
"Thanks for all your comments my friends at Seaknots. The halyard has been rerun without passing through the small stainless steel eye, as seen easily in the pic provided by Chris on 17th August. All furling now takes place without any undue effort,…"
Oct 11
Mike Brown replied to Jochen Vetterlein's discussion O43: Good tracking on starboard side - poor on port side in the group Beneteau 40 & 43
"Well at least you’ve narrowed it down to the Genoa. I doubt here’s any issue with the hull or running gear. Nor do I think the slight list you have will have an impact either as many boats have the same based on how full the water and or…"
Oct 9
Jochen Vetterlein replied to Jochen Vetterlein's discussion O43: Good tracking on starboard side - poor on port side in the group Beneteau 40 & 43
"In the meanwhile, I performed some sailing tests trying to be as impartial as possible. I was sailing close hauled on the starboard and port side. I used the autopilot steering the boat at 37 degrees to the apparent wind. Apparent wind was 12 to 19…"
Oct 9
James Taylor replied to Jochen Vetterlein's discussion O43: Good tracking on starboard side - poor on port side in the group Beneteau 40 & 43
"Sounds like your rigging may be in need of tuning????? (Owned B43#19 for 10 years), Sailed from Mass to Tampa to Bahamas with it, great boat, no major issues at all. Boat has flat bottom basically so no need to put rails in water. I found it a very…"
Oct 9
Mike Brown replied to Jochen Vetterlein's discussion O43: Good tracking on starboard side - poor on port side in the group Beneteau 40 & 43
"I’d also do a test using only the main. The more testing you do the more likely you’ll find the problem. I’d also check to see how much the leeward shrouds sag during all the tests. Let us know what you find. Good luck Mike"
Sep 27
Jochen Vetterlein replied to Jochen Vetterlein's discussion O43: Good tracking on starboard side - poor on port side in the group Beneteau 40 & 43
"It is only when sailing close-hauled. Unfortunately, this is the only course, where performance really matters. I‘m going to perform two tests: - Sailing with genoa only (track cars on the same position). In this case any (unequal) trim…"
Sep 27
Mike Brown replied to Jochen Vetterlein's discussion O43: Good tracking on starboard side - poor on port side in the group Beneteau 40 & 43
"Our 43 had a shaft drive. Depending on how much water or fuel that was in her she would sometimes have a very small imbalance. Nothing that would cause her to sail unevenly. Do you have the problem on all points of sail? Is it more on any particular…"
Sep 27
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