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Old 04-24-2007, 01:40 PM   #15
Auzzee's Avatar
Join Date: Jan 2005
Home Port: Darwin
Vessel Name: Sandettie
Posts: 1,855

Hi Muroc,

Alternative power is a huge subject and may be worthy of a separate topic. However. If you are going to be cruising mostly around the Apple Isle, you can't afford not to have a wind generator. New Airex marine sets are available through the manufacturer on EBay for an astoundingly low cost. Main problems...You need to mount them high to avoid the possibility of injury and although modern units are much better, there is still a problem with them resonating through the hull (harmonic vibration?).

Solar is great if you are cruising tropical latitudes. No matter whether you use solar, wind, 240v alternator, genset, inverters or whatever, it is necessary to link them to your battery banks via smart regulators.

There is a degree of science involved in determining your power requirements, and determining the appropriate charging system and capacity. Add-ons can be a real nuisance in the future, so get good advice from someone heavily involved in marine charging and storage systems, and build it big enough to allow for a future expansion of power needs.



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Old 04-24-2007, 04:50 PM   #16
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Join Date: Sep 2005
Posts: 1,619

Hi again Muroc,

I am pleased you found my answer helpfull. It has occures to me though that I should have added a little more about transponders, such as SeaMe. These devices are not cheap, costing about £400 but they are good. The great advantage with a transponder, apart from being seen, is that in normal operations it draws very little current as it operates in "receive only" mode. Once a RADAR signal is received it goes into transmit mode. Alson, it gives a signal indicating that it has picked up a vessels RADAR signal, which is a good warning of trafic in the vicinity.

What is the disadvantage? Well, apart from not being a RADAR as such, thus not being able to indcate the direction and range of the vessel from which a signal has been receved, it operates only on one wavelength. Maritime RADAR operates on either 3 or 10 cm. wavelength. Normally ships use 10cm but at shorter distances 3cm. The advanced RADAR sets big ships use change the wavelength automatically as the range is changed. This means that the transponder will only be picked up on the 10cm. wavelength. Is this a problem? Well, not normally. Looka arround at big ships and you will see that they are fitted with at least two RADAR sets. They usually have one set at longer (10cm) range and one at closer 3cm. range.

Once again, good look with the boat.




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