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mark klusman
#1 Posted : Wednesday, June 09, 2010 1:47:13 AM(UTC)
mark klusman

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Since i moved to a new 32ft. slip my capac readings have gone up to .09 . The old slip i could never get above .07 at the best. Water depth the same at both slips. Always got a good reading in deep water. I know that there are a lot of variables, with other boats , water conditions, electical supply on and off boat and of coarse , noble protection. Since she's 38 yrs. old and in the water all year i spent a fair amount of time trying to correct the situation. I probably have read most of the topics on the forum about this. Who would have guessed a 50yd. move would have corrected the situation. Just one less thing on my bucket list.

Mark
No matter where you go,there you are.
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RCPRATHER
#2 Posted : Wednesday, June 09, 2010 11:56:44 AM(UTC)
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Hello Mark,
I am new to this whole capac thing but I just but my boat in this week freshly paint and new anodes I purchased from Boatzincs.com. My meter only reads .07 what do you think I might look for?
Thanks,
Rob
"Great Escape"
32ft 1972 Express
Twin 318's
Located at LBYC
On the Ohio River at mile marker 480
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Lou
#3 Posted : Friday, June 11, 2010 12:18:10 AM(UTC)
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I have a 1975 28' express and have generally had readings of .7 to .9
During winter I had a dual bank trickle charger installed. Now my readings are 1.1 to 1.2
Should I worry? We are on lake Erie and I understand water temp and wherre I am on the lake makes a difference.
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Barkleydave
#5 Posted : Friday, June 11, 2010 12:39:22 AM(UTC)
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Question:

1. Did you replace an existing charger?
2. If you did was it a marine charger you replaced or something else?

Questions:

New Anodes lower readings.

1. Replacing anodes will not improve readings if there are isolation issue which require attention.
Go back to basics and check isolation of shafts, galvanic isolator etc. Also check calibrationn of your meter with high quality meter

Question:

Your readings improved when you moved.

It would appear your had some other boats with electrical problems or problems withh the dock current at previous location.
That is not uncommon. It is amazing how many folks have no galvanic isolators (probably 95 percent) and used cheap automotive battery chargers which are very dirty. Also take a walk down your dock and look at some of the shore power connections...you might be surprised how unsafe some are!

dave
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jralbert
#6 Posted : Friday, June 11, 2010 3:02:54 AM(UTC)
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Starting with something simple: you mentioned "fresh paint". Did you, perhaps, paint the surface next to the anodes? The surface they touch must be unpainted. Bare metal to metal contact
Joel Albert, Potomac MD
"Charlie B" - 1988 32' FBS
Twin 318's/FWC/16x15 nibral props
docked Deale, MD
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tundrarules
#7 Posted : Friday, June 11, 2010 7:10:17 AM(UTC)
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I have been battling with a low Capac reading for a few months now. I had my boat pulled and put all new anodes (alum for fresh water) on. My Capac reading went from .6 to 7.5. Still not good. I checked my meter with a volt meter and it is reading correct. I do have an isolation issue with my rudders, but the verdict is still out on this. I have a flybridge and it seems that Marinette did not isolate the flybridge drive cables from the hull, so I have no idea if I can get a better capac reading or not. I can tell you, many people on this forum use magnesium on their trim tabs to bring their reading up. I think as many others do, magnesium is a must in freshwater !!!!

Best of luck to you Brick wall
1985 Marinette 29 Sedan bridge
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If the guys on this forum take their time to help you, have the courtesy to update your thread with the resolution.
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mark klusman
#8 Posted : Friday, June 11, 2010 7:34:46 AM(UTC)
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Rob , i'll try to answer your question first to what i have learned and read on the forum. First of all ,give it a little time and the readings will probably come up. Joel is right about the anodes touching an unpainteds surface. Yours at .07 at dock, i'm incline not to worry if it comes up away from there. You can pour a lot of money into getting that reading up to.09 to 1.2 but mines 38yrs. old and it's going to out live me.
Lou, for the charger, best i can say is i have a 4 bank that i bought and when the batts. are probably 95 % charged it drops to 1 or 1 1/2 conditioning. I have 3 house batts. and of coarse 2 starts batt. . No inverter as yet.
All of Daves questions to you are great and believe me the dock and cheap auto. chargers are not high on my list. At the old slip i did everything that most mentioned but all noiticed everytime we were out the reading went up. Lets say what ever the problem was.... the move sure fixed it. May not be yours ,but keep asking questions and checking your systems. Believe me you can't get any better info. than right here from these members of the forum. Keep swatten that fly!!

Mark
No matter where you go,there you are.
Knot Normal
28FT. Express
Twin 318's
Ten Mile Tn.




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Docsnow
#4 Posted : Friday, June 11, 2010 8:46:25 AM(UTC)
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Lou wrote:

Now my readings are 1.1 to 1.2
Should I worry?
.
Lou,

The readings U R getting R at the high limits. If they go higher than that I'd be concerned over protection is just as bad as having a low reading. On the new charger disconnect it & see where the reading are at give it a while like at least 8 hr or so in the mean time monitor the meter see if U notice a drop \.Think

Norm,

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collins69s
#9 Posted : Monday, June 28, 2010 10:39:31 AM(UTC)
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This thread is of some serious interest to me now... The past month or so has seen a decline of the readings at the dock from .9 to .75 or .8 . When I am away from the dock my reading is always .9 to 1.. Even toward the end of our row of docks.. I would love to have everyone's shore power at my dock shut off and see what happens as they are turned on one by one..Think And what is the "recovery" time for the reading? If the people at the dock next to me go out and I check my reading after they leave, would it be higher instantly if they were the problem?
Thanks,
Sean
SIFF SURF
1972 32' FB Express
Twin 318s
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fastjeff
#10 Posted : Monday, June 28, 2010 11:49:02 AM(UTC)
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Sitting at the dock for weeks will always lower the readings as the anodes get coated up with slime. Go for a spin and the readings will come right back.

Jeff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell
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collins69s
#11 Posted : Monday, June 28, 2010 12:00:36 PM(UTC)
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They don't, Jeff..I take her out every week and out on the lake, the readings are great, and as soon as I get back to the dock they aren't... I think someone has some goofy wiring.
Thanks!
Sean
SIFF SURF
1972 32' FB Express
Twin 318s
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Barkleydave
#12 Posted : Monday, June 28, 2010 2:15:25 PM(UTC)
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If it is an offending vessel and leaves your readings will move immediately.

Ask your boat neighbors to disconnect if they are unwilling then I would do some investigation and complain to the marine owner.

dave
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fastjeff
#13 Posted : Monday, June 28, 2010 9:56:01 PM(UTC)
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Agreed. Someone is zapping your boat with a bad power cord or etc.

Jeff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell
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tr_guy79
#14 Posted : Tuesday, June 29, 2010 2:14:10 AM(UTC)
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We really do need a (clear, concise, and complete) FAQ on CAPAC.

I am now wondering what the danger of "over protection is" Do molecules FROM the anodes end up embedding in the hull? I did not make it down to the boat last week end, but the previous weekend I was at a 1.05, from a previous .95 (see "Fast Death for Anodes" post)

I am confused about how I could be OVER protected. Do I need to remove one of my anodes?

-Shane
"McKenna Renee"
1972 '32 FB Express. Twin 318 / Edelbrock 1409s
Chesapeake City Md (Upper Bay / C&D Canal)
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jralbert
#15 Posted : Tuesday, June 29, 2010 3:38:20 AM(UTC)
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Shane..unless you mean 1.5 instead of 1.05, you are within range. Not to worry.

-Other boats: Telling the marina what I was about to do, I went down the dock...about 10 boats in each direction, looking for one that might have caused the CAPAC reading to drop. Unplugged power cords one by one, then re-checked my meter. In my case, I could not find an offender. After doing a mid-season power wash, the reading jumped up to normal range and, I discovered that the push button on the capac unit wasn't making really good contact. Just my experience and this was not to say that one of your neighbors does not have a wiring issue. Hope you are able to track it down.
Joel Albert, Potomac MD
"Charlie B" - 1988 32' FBS
Twin 318's/FWC/16x15 nibral props
docked Deale, MD
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fastjeff
#16 Posted : Tuesday, June 29, 2010 3:50:37 AM(UTC)
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The anodes dissolve into metallic compounds that go into the water.

Jeff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell
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tr_guy79
#17 Posted : Tuesday, June 29, 2010 5:22:13 AM(UTC)
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I am confused. When I have a chance, I am going to do some research and write an easily understood FAQ about the CAPAC meter and the readings we all see.

Joel - I wouldnt be concerned about it, except my anodes are looking really torn up, and this is my first time having the boat in the water...

-Shane
"McKenna Renee"
1972 '32 FB Express. Twin 318 / Edelbrock 1409s
Chesapeake City Md (Upper Bay / C&D Canal)
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pfhlaw
#18 Posted : Tuesday, June 29, 2010 6:16:40 AM(UTC)
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Not to confuse the issue, but CAPAC makes 2 different types of systems.

1. Ours is just a meter that measures (with the help of a reference electrode) the electrical potential or voltage that is generated by immersing our metal hull in an electrolytic bath (sea water, lake water, etc.) along with sacrificial anodes of zinc, aluminum or magnesium alloys.

2. The other is an impressed current cathodic system that discharges a computer-controlled amount of DC current into the water through a cathode, to acheive a sort of electrical equilibrium. These systems are used on large metal-hulled boats like the Chris Craft Roamers, Burgers and Browards.
Peter
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twin Chrysler 360 cu. in. 250 hp engines
Raw water cooled
Nimbus II
Home port: New Buffalo, MI
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Lou
#19 Posted : Thursday, July 01, 2010 6:29:25 AM(UTC)
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My readings seem to have settled between .9 and 1.05 depending on where I am. Charger I have is a marine dual bank charger (Xantrex Truecharge 10).
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jralbert
#20 Posted : Thursday, July 01, 2010 2:54:37 PM(UTC)
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From Jeff (above): "...Sitting at the dock for weeks will always lower the readings .." -- pay attention to the man.

When I launched in early June with fresh or buffed up zincs, my CAPAC reading was about 1.1 - in the groove. Yesterday, after wks of the boat sitting, going nowehere, is was below 9. Then, we ran her for a few miles, not fast at all, and when we returned to the dock, the reading was about 1.0. So slime & goop will def drop your reading. This is not to say you shouldn't look around if there's a prolonged drop not cured by running the boat. Again, it's a tiny12V DC leak that will cause you major headaches...not AC (altho an AC ground or other problem is nothing to ignore). In the DC case, all the electrons are steadily marching in one direction, carting off your boat or accessory's precious metal

Joel Albert, Potomac MD
"Charlie B" - 1988 32' FBS
Twin 318's/FWC/16x15 nibral props
docked Deale, MD
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