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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems > yet another battery charging question
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Topic Review (Newest First)
08-19-2013 11:45 AM
chucklesR
Re: yet another battery charging question

Quote:
Originally Posted by xort View Post
I freq see a pair of solar panels on the safety lines, each side near the aft. One mounting method is to run the lifeline thru a piece of stainless tube. The tube hangs on the lifeline. The panel is attached to the tube so it can swing out horizontal looking like a wing. A prop rod is fabricated to hold it up. Lower and secure the panel while underway. Make sure the stored panel will not catch anything when docking
Actually the stainless tube is attached firmly to the stanchion (not with the wire running through it), just under the lifeline.
Using something like one of these.
Suncor Rail Fitting
I got heavier duty ones on both upper and lower lines.
The panel mounts directly to the rail then, and can (depending on connector) pivot up and own.
I'll be mounting my twin Kyocera 140w's tomorrow (waiting on parts).
08-19-2013 09:22 AM
Maxion
Re: yet another battery charging question

Quote:
Originally Posted by chal View Post
Safety lines? What are those???

Seriously, we have no pulpit, no pushpit, and no lines. The only place where we could put panels without having to move them to use the boat would be on the coach roof. The flexible sort that could go over the boom and then roll up for storage might be good though.
A stainless steel / aluminum pilar from the transom with the panels mounted on a swivel works.
08-19-2013 08:25 AM
manatee
Re: yet another battery charging question

Quote:
My wife and I have often thought that we are sitting on a tremendous amount of energy in terms of moving water, but you seem to need about 5 knots flow to get anything useful out of a turbine, and the river is about 2-3.
So cheat.

Use bicycle parts to run it up to a useful speed.
08-19-2013 02:55 AM
chal
Re: yet another battery charging question

Quote:
Originally Posted by xort View Post
I freq see a pair of solar panels on the safety lines
Safety lines? What are those???

Seriously, we have no pulpit, no pushpit, and no lines. The only place where we could put panels without having to move them to use the boat would be on the coach roof. The flexible sort that could go over the boom and then roll up for storage might be good though.
08-19-2013 02:52 AM
chal
Re: yet another battery charging question

Quote:
Originally Posted by manatee View Post
How much current in the river?
My wife and I have often thought that we are sitting on a tremendous amount of energy in terms of moving water, but you seem to need about 5 knots flow to get anything useful out of a turbine, and the river is about 2-3.

The one you point to seems a bit better but still needs 4 knots, so probably no much use to us.
08-18-2013 05:32 PM
xort I freq see a pair of solar panels on the safety lines, each side near the aft. One mounting method is to run the lifeline thru a piece of stainless tube. The tube hangs on the lifeline. The panel is attached to the tube so it can swing out horizontal looking like a wing. A prop rod is fabricated to hold it up. Lower and secure the panel while underway. Make sure the stored panel will not catch anything when docking
08-18-2013 03:19 PM
manatee
Re: yet another battery charging question

How much current in the river? I've wondered why no ever mentions turbines to make electricity, like this:
Ampair Wind, Hydro and Packaged Power specialists +44 (0) 1258 837 266 | Aquair 100
08-18-2013 01:42 PM
hellosailor
Re: yet another battery charging question

Depending on your details, maybe using the solar panel(s) forward of the mast, or even clipped onto the bow, and removed before sailing. Or strapped on top of the boom, and again, removed before sailing. Even if you were moored in a fjord, "something" beats "nothing".
08-18-2013 12:09 PM
Stu Jackson
Re: yet another battery charging question

Stay with the solar. Don't waste $$ on an external regulator (yet!!!). Here's why:

Musings Regarding External Regulation - SailboatOwners.com
08-18-2013 09:03 AM
chal
Re: yet another battery charging question

Quote:
Originally Posted by hellosailor View Post
if you have a problem with shade on the coachroof, I would suggest looking at 2-3 smaller panels instead of one larger panel.
Thanks, that's a good idea. The whole issue of where to site the panels is a tricky one. The boat has no pushpit to hang them off as lots of people do. The mooring is on a tidal river that runs pretty much north-south and, owing to its latitude, the sun is always to the south. As the boat swings with the current, the existing solar panel on the forward hatch is either in good sun or shaded by the mast. A panel on the coach roof is almost always going to be in some shade from the boom, and I think even splitting it and having 2 panels, neither would be in full sun for much of the time (there are hills both sides of the river).

I'm therefore wondering if it would not be better to spend the money on the smart regulator for the alternator (instead of the additional solar panel(s) and regulator(s)). I would prefer something a bit more environmentally friendly than running the engine, but if an almost constantly shaded panel would not contribute much power anyway, perhaps it would be better to try to maximise the contribution of the alternator.

That would make the setup:

- batteries as per original post
- existing small solar panel but perhaps with mppt controller
- alternator with smart regulator
- both the above connected to house batteries
- echo charger to keep crank battery topped up

Any thoughts?
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