Ultrasonic antifouling

snowleopard

Well-Known Member
Joined
16 May 2001
Messages
33,645
Location
Oxford
Visit site
As I shall shortly have a Jaycar store just around the corner I was thinking of giving it a try. What are the latest experiences on effectiveness and current drain?
 
When it's switched on I believe it does increase protection. When it's gone off it's no good to man nor beast.

I can't comment about the Jaycar ones, I've only used Ultasonic Antifouling Ultra 10 which was a success in the first year and a failure in the second year due to it spending a lot of the season off thanks to a number of power problems not related to the equipment itself.

I'm not going to take the risk again, so I'm going over to Coppercoat and Ultrasonic Antifoul
 
Nothing like stating the bleedin obvious :D

My point was that if for some unexpected reason it goes off, your boat is unprotected and weed will grow like you would not believe.

I had power trouble at the marina - it was Scotland where the power in the winter was intermittent, and on the sail down our battery charger went up in smoke and took 3-4 week to get a replacement - just at the start of spring when everything in the water starts to bloom.

You have to make sure you have a constant power supply that will provide around 16A a day
 
Last edited:
My point was that if for some unexpected reason it goes off, your boat is unprotected and weed will grow like you would not believe.

I had power trouble at the marina - it was Scotland where the power in the winter was intermittent, and on the sail down our battery charger went up in smoke and took 3-4 week to get a replacement - just at the start of spring when everything in the water starts to bloom.

You have to make sure you have a constant power supply that will provide around 16a a day

Sorry Snooks, my comment was meant to tongue in cheek, not meant as any sort of criticism. I think we all know where you were coming from.
 
You have to make sure you have a constant power supply that will provide around 16a a day

Or buy the Blue and Green Marine one that uses a small fraction of that.

I have an 70 or so watt solar panel and it more than copes.
What do you think he means? "16a a day" doesn't mean anything. If he means 16A for 24 hours, that would be 384 AHr which would flatten my house battery in about 6 hours. I can't think what else he could mean.
 
Sorry not quick enough on the shift key....16A (amps) over a 24 hours period.

Yes I know it's the incorrect way of putting it, but if I was a doing a power audit I would want to know the number of Ah I would be using, hence writing it as 16A /day because that's how I see it using the power.

To put it another way (probably the way you would like to see things) 0.6Ah for 24 hours a day, every day your yacht is in the water.
 
Sorry not quick enough on the shift key....16A (amps) over a 24 hours period.

Yes I know it's the incorrect way of putting it, but if I was a doing a power audit I would want to know the number of Ah I would be using, hence writing it as 16A /day because that's how I see it using the power.

To put it another way (probably the way you would like to see things) 0.6Ah for 24 hours a day, every day your yacht is in the water.

Writers in YM often seem to get their knickers in a twist over power consumption. That explanation left me totally confused!

16A for 24 hours is 16x24 Ah (=384 "ampere-hours", not as often written in YM "amps per hour").

Whereas 0.6 Ah over 24 hours is an average current flow of 0.6/24 amps (=25mA=tiny!)

Goodness knows what the device actually uses!

Mike.
 
Writers in YM often seem to get their knickers in a twist over power consumption. That explanation left me totally confused!

16A for 24 hours is 16x24 Ah (=384 "ampere-hours", not as often written in YM "amps per hour").

Whereas 0.6 Ah over 24 hours is an average current flow of 0.6/24 amps (=25mA=tiny!)

Goodness knows what the device actually uses!

Mike.

Seems clear to me. It uses 16 amp hours per day.
Mine uses about 3.
 
Back to the original point, so far so good. Launched in Marmaris in the spring, and no barnacles except one on the rudder when I left the boat (still in the water) on 18th October. I did get some fouling at the waterline forward of the mast and mainly to starboard. I then found that the forward transducer, which is to port of centre, was slightly unscrewed, so probably only partly effective. The real test will be the condition of the hull at haul out next October.
 
On the east coast with relatively light use just slime on the hull no barnacles a slight weed growth at the waterline but on the uncoupled Hydrovane shaft dipping in the water a massive weed growth, conclussion it's working. A 50 watt solar panel has easily kept up with the power needs, without looking it up I think each unit averages 0.2 Ampere hours.

So Far so good:D
 
On the east coast with relatively light use just slime on the hull no barnacles a slight weed growth at the waterline but on the uncoupled Hydrovane shaft dipping in the water a massive weed growth, conclussion it's working. A 50 watt solar panel has easily kept up with the power needs, without looking it up I think each unit averages 0.2 Ampere hours.

So Far so good:D

Sorry to be obtuse, but which device, how big boat, how many transducers etc, etc?
 
Sorry to be obtuse, but which device, how big boat, how many transducers etc, etc?

This is from their website:

Many of you know that you can buy imported marine growth electronic antifouling systems that cost up to $8000. Jaycar, with Silicon Chip have developed a similar system based on this technology and information in the public domain. This project uses the same ultrasonic waveforms and virtually identical ultrasonic transducers mounted in sturdy polyurethane housings. By building yourself (which includes some potting) you save a fortune! Standard unit consists of control electronic kit and case, ultrasonic transducer , potting and gluing components and housings. The single transducer design of this kit is suitable for boats up to 10m (32ft); boats longer than about 14m will need two transducers and drivers. Basically all parts supplied in the project kit including wiring. (Price includes epoxies).

Specifications:
• 12VDC
• Suitable for power or sail
• Works with aluminium and fibreglass boats (not suitable for timber, ferro cement or fibreglass foam sandwich construction)
• Could be powered by a solar panel/wind generator
• Output frequency range: 19.08 - 41.66kHz in 14 bands with 200ns steps.
• Frequency sweep in each band: 12 frequencies ranging from 80Hz spacings at 20kHz to 344Hz steps at 40kHz
• Signal burst period: 600ms at 20kHz, 300ms at 40kHz (12000 cycles/ burst)
• Output drive. 250VAC
• Supply Voltage. 11.5V to 16V maximum
• Current drain: 220mA average at 12V driving a 3nF load

That comes out at 5.28 AH per day.
 
Top