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Help diagnosing battery overcharging issue.

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  • 1 Post By bkcorwin
  • 1 Post By bkcorwin

Help diagnosing battery overcharging issue.

Old 02-04-2018, 06:39 PM
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Default Help diagnosing battery overcharging issue.

I am running a 2008 wellcraft coastal 290 with twin yamaha f250s. We have been dealing with an overcharging issue on our house battery and I am hoping you all can help me come up with some more ideas for diagnosing. My father has been running the boat through these issues and I am going to go to the boat with my meter later this week but want a plan of attack. This is largely a set of notes best we can gather as my dad cant remember the exact sequence but I wanted to document the things we are seeing.

The boat has two start batteries and a single house battery. There are VSRs setup to charge the house battery. It is a factory setup aside from that I relocated the house battery from the port stern to underneath the drivers seat. I did this relocation several years ago and everything worked fine after I did this.

The first time it happened he came down to the boat and found a strong sulfur smell and noticed that the battery was seriously hot. He removed the battery. This may or may not have been after running the boat he cant recall. A friend advised that perhaps the starter batteries were bad and that was causing the system to try to dump more power into the house battery. So we replaced the starter batteries as well as replaced the house battery.

We thought the issue was fixed. The next time however occured while running the boat. Driving the boat back to our dock he noticed again a strong sulfur smell and found the battery was hot again. Disconnected and thats where we sit right not.

Had it been only on the charger Id have thought the charger went bad. Had it been only while running I'd have thought maybe some kind of voltage regulator or VSR issue?

But since its some weird combination I am not sure. I would appreciate any and all comments from you guys about things I could potentially look at. Our plan of attack is to get a cheap battery and put it in the house battery spot so that I can meter around with the engines and charger running without risking frying an expensive agm.

Thoughts, comments, advice appreciated.

Thanks much
Brian
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Old 02-04-2018, 07:33 PM
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if they battery is hot. it's either a bad house battery or the voltage is way too high. only way to know is stick on volt meter on it. the engine batteries would have nothing to do with it. you shouldn't have replaced those the first time. if the start battery was bad, they'd be the hot one. and less current would be going to the house battery.

the vsr's just combine the batteries. they don't regulate anything.
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Old 02-05-2018, 07:28 AM
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Good points. What could possibly cause the voltage to be too high on the house battery but not the start battery given the VSR setup?

B
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Old 02-05-2018, 08:22 AM
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Agree, just double bad luck, don't buy any lottery tickets.
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Old 02-05-2018, 11:30 AM
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May or may not have anything to do with the hot battery BUT.... it sounds like the only thing you have changed from the factory wiring is moving the house battery from stern to console.

What size wire did you use from the start battery to VSR to house battery?
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Old 02-05-2018, 01:41 PM
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Right I did relocate the battery. I believe I only changed the wire from the VSR to the house battery. This wire was replaced with 2/0 if memory serves using tinned marine grade wire from greggs marine wire supply. Based on my calculations using distance and voltage drop this was more than sufficient.

Also the setup worked fine for some time.
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Old 02-05-2018, 02:04 PM
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What is battery terminal voltage on charger and with engines running? Normal is around 14.0-14.5Vdc. Much higher than that and it will cook batts. May need to check while/after a ride to get batts fully charged for check to be valid.
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Old 02-05-2018, 03:22 PM
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I will check those voltages this week. That was my plan anyway. I'll post up when i do

thanks!
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Old 02-05-2018, 07:47 PM
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Sounds like you have already changed out all the batteries including the house battery and it happened again, so apparently not a battery issue.

Are all batteries are of the same type and voltage ? Not mixing batteries of different types, standard wet cell, AGM, Lithium or Gel Cell ?

Is there a shore charger in addition to the two VSR's for charging the house battery when under way?

As has been mentioned measuring house battery terminal voltage when the condition occurs is the best first step. All I can think if is over-charging that seems not possible for only the house battery If house battery is of the same voltage and type as start batteries. Or you have a very heavy intermittent load or short on the house battery.

Are all loads on the house battery properly fused ?

Does the house battery constantly need additional water ? A condition associated with overcharging?

Jim
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Old 02-05-2018, 09:48 PM
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There is a shore charger but it doesnt do anything unless hooked up to shore power. At least thats my assumption? All my other boats have behaved that way.

The two starting batteries are optima blue tops and the house battery that leaked from over charging was a diehard platinum marine group 31
http://www.sears.com/diehard-platinu...p-02850131000P

All agm batteries. Dont think that was an issue?
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Old 02-06-2018, 04:53 AM
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If all AGM should be no issue. The shore charger can be an issue if not properly fused, I had a friends boat almost catch on fire when the shore charger shorted out and was not fused, lots of smoke. We were just sitting at the dock and smoke starting pouring out of the Grady. Not even connected to shore power and the charge just shorted out

Just having a hard time understanding what is causing this house battery issue and looking for a clue of some kind.

Let us know what you find when you measure the terminal voltage, you may have to wait for the VSR's to switch over to the house battery to actually measure charging voltage. Also measure the charging voltage on the two start batteries.



Jim
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Old 02-06-2018, 07:39 AM
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Ooo good points, make sure the alternator sense wire is connected to the alternator output terminal and not to a battery on the other side of a switch or Combiner where it is not seeing the true charging voltage.
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Old 02-06-2018, 08:54 AM
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Originally Posted by bkcorwin View Post
I am running.... twin Yamaha f250s.
Originally Posted by yandina View Post
make sure the alternator sense wire is connected to the alternator output terminal
I'm not sure how to find the alternator sense wire on a Yamaha
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Old 09-21-2019, 02:10 PM
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For closure. The problem was the charger itself. Replaced with new promariner charger and all is well.
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