I'm on shore power with galvanic isolators in my circuits. After 6 months I've got almost 100% of my zincs. 75% is not bad.
Joel <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virus-free. www.avg.com <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> On Mon, Sep 25, 2017 at 11:33 AM, Josh Muckley via CnC-List < cnc-list@cnc-list.com> wrote: > I'm in brackish water (about 50% as salty as the ocean). I get my zincs > from boatzincs.com and they recommend using a more active metal than zinc > in brackish water - aluminum. > > http://boatzincs.com/pdfs/Chart_A-Which_Anodes_Should_I_Use.pdf > > http://boatzincs.com/pdfs/Chart_B-Which_Anodes_Should_I_Use.pdf > > About 5 years ago I used 2 extra large zinc shaft anodes and the zinc > Max-Prop cone anode. I would stay on shore power and didn't have a > galvanic isolator. A good amount of anode would be gone after 1 year. > About 3 years ago I installed a shaft dampener which electrically isolates > the shaft from the engine. A considerable amount of anode was being left > at the conclusion of 1 year. So 2 years ago I shifted to 1 extra large > aluminum shaft anode and an aluminum cone anode. Last year's haul out > showed about 50% remaining after 1 year so I stayed with that combination. > I've also installed solar panels which during the off season and > intermittently during the season allow me to stay off shore power. I have > stayed on the same dock but moved slips and the number of slip neighbors > has changed. Some neglected boats have received maintenance and some > maintained boats have gone without. > > As you can see there are quite a few variables which make dialing in the > correct type and number of anodes challenging. I have attempted to learn > what disadvantage being "overzinced" holds and since our boats are FRP and > I have Marlon through-hulls, no applicable answer was found. Only that it > is a waste of money. In my case, it seems far better to error on the side > of too much than not enough. > > As for the shore power connection it is your neighbors who don't have > enough anode that are using yours by way of the ground wire in the shore > power cable. As for the shaft coupling isolator there is a way to jumper a > wire across the coupler but I could find no professional opinion or > scientific study which sufficiently convinced me that I needed to install > said jumper. The boat is "bonded" to the keel and the keel to the engine. > > Josh Muckley > S/V Sea Hawk > 1989 C&C 37+ > Solomons, MD > > > > On Mon, Sep 25, 2017, 10:46 AM Bruce Whitmore via CnC-List < > cnc-list@cnc-list.com> wrote: > >> Hello all, >> >> I just wanted to check in with you folks. For those of you who are in >> saltwater, on a dock, and plugged into shore power, how long would you >> expect to see your shaft zinc last? I get a regular report from our diver, >> who, after about 6 months, indicated that the zinc is down to about 70% of >> new. >> >> Thanks for the input, >> >> Bruce Whitmore >> >> (847) 404-5092 (mobile) >> bwhitm...@sbcglobal.net >> _______________________________________________ >> >> This list is supported by the generous donations of our members. If you >> wish to make a contribution to offset our costs, please go to: >> https://www.paypal.me/stumurray >> >> All Contributions are greatly appreciated! >> > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > wish to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! > > -- Joel 301 541 8551
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