Anchor light w/photodiode opinions/options, battery draw - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 08-12-2009
Junior Member
 
Join Date: Aug 2009
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Ringding is on a distinguished road
Anchor light w/photodiode opinions/options, battery draw

I am trying to find an anchor light for my masthead. Does anyone have experience with this OGM LED light with a photodiode? Also what size and type of battery would be suffiecient for this light? Any recommendations on a solar charger to keep the battery charged? The anchor light and on rare occasions the running lights will be all that will be drawing on the battery.

West Marine link to OGM anchor light. price $187.99

West Marine Annual Catalog - page 302

Are there cheaper options like the Attwood all around LED light combined with a third party photodiode switch? Both the light and the diode switch are each around $60? So roughly the cost of the OGM light.

Or would it be better just to get a cheap 10watt light with a third party diode switch and a bigger battery/charger? If so what size battery and charger?
Any suggestions on configurations are welcomed. I just need a nice anchor light and battery that will stay charged to anchor here in Florida legally.
Thanks for the help.
Reply With Quote Share with Facebook
  #2  
Old 08-12-2009
Senior Member
 
Join Date: Apr 2008
Posts: 476
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
negrini is on a distinguished road
Send a message via AIM to negrini Send a message via Yahoo to negrini Send a message via Skype™ to negrini
To be legal, there are some other factors, like boat size, that you don't mention. Anyway, considering you're concerned about power usage, I'm supposing this is a small one. I like the Mega-Light Utility from DAVIS. Worked fine on my O'Day 23, at that time they had an wired version.
__________________
Nave Rara
Beneteau Oceanis 43
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #3  
Old 08-13-2009
Senior Member
 
Join Date: Jan 2008
Posts: 393
Thanks: 1
Thanked 4 Times in 4 Posts
Rep Power: 7
noelex77 is on a distinguished road
Quote:
Originally Posted by Ringding View Post

Are there cheaper options like the Attwood all around LED light combined with a third party photodiode switch? Both the light and the diode switch are each around $60? So roughly the cost of the OGM light.
Not many LED lights have a photo diode. The reason is that the photo diode circuit consumes some electricity both when the light is off and on. Although the consumption is only small it is difficult to design a circuit that will consume much less electricity than leaving the LED on longer, even 24hrs.

Some solar panel regulators have a circuit that will switch on and off when the solar output drops a night.
Reply With Quote Share with Facebook
  #4  
Old 08-13-2009
jarcher's Avatar
Senior Member
 
Join Date: Jul 2008
Location: Smithfield, RI
Posts: 986
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
jarcher is on a distinguished road
Those OGM lights are extremely, extremely well made. They use about 0.5 amp when on, which is very little power. I installed an OGM nav/anchor/strobe with photo diode on my masthead. These things are sturdy, small and water tight.

I suggest you not roll your own light or photo switch. Do some searching here for OGM and you'll find many threads where this is discussed. Basically, you want a fixture that is USCG approved. That means you have to use it exactly as it was approved. If you change the bulb, it has to be the same bulb.

This is in case you get into an accident. If your stuff is modified or not approved then you give the person suing you (or who you are suing) an excuse to claim the accident was at least in part your fault.
Reply With Quote Share with Facebook
  #5  
Old 08-13-2009
Maine Sail's Avatar
Senior Member
 
Join Date: Jan 2003
Location: Maine Coast
Posts: 5,351
Thanks: 11
Thanked 121 Times in 89 Posts
Rep Power: 15
Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice
I have to ask

I have to ask? With an LED drawing very, very little current why would you also want a photo diode? The reason to turn on and off incandescent bulbs with a photo eye is to save relatively large amounts of amp hours.

For example my old anchor light was a 20 watt incandescent bulb and it drew 1.7 amps per hour, or 17 amp hours for a ten hour run. My current LED anchor light draws 1 amp hour for every ten hours of use or 1700% less consumption! An extra couple of hours does make a difference when using an incandescent but not so much with LED.

I now have a Dr. LED Polarstar 40 bulb in an AquaSignal Series 40 all/round anchor light fixture. This is technically a USCG approved combination. It draws roughly .1 amps per hour. That is still only 2.4 amp hours in a 24 hour period.

I still don't see a need for a photo electric eye to turn it on and off unless you have other reasons than I would for using an LED anchor light.

This is the combo:

Close up of Polarstar 40 bulb:

Anchor Light #1:

Photo of different bulbs:


P.S. The bulb is $41.99 (Defender) and the fixture can be found for between $50.00 & $65.00 depending upon the vendor. I paid under $100.00 for this set up and it's BRIGHT!!!!!..
__________________
______
-Maine Sail / CS-36T


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.




© Images In Posts Property of Compass Marine Inc.



Last edited by Maine Sail; 08-13-2009 at 08:27 AM.
Reply With Quote Share with Facebook
  #6  
Old 08-13-2009
jarcher's Avatar
Senior Member
 
Join Date: Jul 2008
Location: Smithfield, RI
Posts: 986
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
jarcher is on a distinguished road
I only have a single 90 AHr house battery. I figure turning off a light that is not needed never hurts.
Reply With Quote Share with Facebook
  #7  
Old 08-13-2009
Maine Sail's Avatar
Senior Member
 
Join Date: Jan 2003
Location: Maine Coast
Posts: 5,351
Thanks: 11
Thanked 121 Times in 89 Posts
Rep Power: 15
Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice
Quote:
Originally Posted by jarcher View Post
I only have a single 90 AHr house battery. I figure turning off a light that is not needed never hurts.

Yup I would be afraid to turn much of anything on especially if you are sailing off the hook or live on a mooring.

90ah to 50% depth of discharge (max draw down) = 45 usable amp hours. If on the hook or charging using only an alternator figure you'll only ever get back to roughly 80% of that 90ah capacity. So you now have only 72 ah's total available leaving you only 22 usable ah's before you hit a 50% depth of discharge. A 22 ah bank is barely enough to be safe if you needed your running lights. Of course you can always go below 50% DOD but you'll be shortenting the battery life..
__________________
______
-Maine Sail / CS-36T


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.




© Images In Posts Property of Compass Marine Inc.


Reply With Quote Share with Facebook
  #8  
Old 08-13-2009
jarcher's Avatar
Senior Member
 
Join Date: Jul 2008
Location: Smithfield, RI
Posts: 986
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
jarcher is on a distinguished road
Quote:
Originally Posted by Maine Sail View Post
Yup I would be afraid to turn much of anything on especially if you are sailing off the hook or live on a mooring.

90ah to 50% depth of discharge (max draw down) = 45 usable amp hours. If on the hook or charging using only an alternator figure you'll only ever get back to roughly 80% of that 90ah capacity. So you now have only 72 ah's total available leaving you only 22 usable ah's before you hit a 50% depth of discharge. A 22 ah bank is barely enough to be safe if you needed your running lights. Of course you can always go below 50% DOD but you'll be shortenting the battery life..
Yup! For now I pretty much only use the running lights (also LED - Aqua Signal Series 32) when the evening race runs long. I have yet to actually use the anchor light to anchor or use the mast head nav lights.

I also have a 90 AHr starter battery and a 1-all-2 switch. These batteries are from Walmart. They came with the boat. In the Spring I plan to replace them with actual quality batteries and add a 110VAC chargeing system. But, I do much more racing than cruising, so the batteries will be as small and light as I can safely get away with. Plus, the battery compartment is pretty small.

But as you said, for now, I turn on only what I need - VHF, GPS, instruments and when needed nav lights.
Reply With Quote Share with Facebook
  #9  
Old 08-13-2009
surftom's Avatar
Member
 
Join Date: Sep 2006
Posts: 63
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
surftom is on a distinguished road
I have the OGM tri-photo-strobe. Expensive but it is rock solid and draws very little. I could have rolled my own but decided to go the OGM route based on reading this forum and have not regretted the decision one bit.
Reply With Quote Share with Facebook
  #10  
Old 08-13-2009
hellosailor's Avatar
Plausible Deniability
 
Join Date: Apr 2006
Posts: 10,625
Thanks: 2
Thanked 89 Times in 87 Posts
Rep Power: 10
hellosailor has a spectacular aura about hellosailor has a spectacular aura about
Depending on who you ask and who you believe, LEDs may lose half their brightness after 10,000 hours of use. Or 5,000 or 50,000, depending on who you ask.

So if you take 10,000 hours, divide by 24 hours per day, leave the LED on all the time...that's some 416 days before the LED is at half-brightness, which isn't a good thing. Leave it turned OFF during the daylight hours...and you obvisouly double the life, or more.

Then the only question is whether OGM, or anyone else, will quote you a number of hours and send someone out to climb your mast and replace the LED if it dims sooner than that.

FWIW, I've seen a number of Leviton brand white LED night lights (junk from China) go from "incredible" to "is that on?" in only 18 months of near continuous use.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Installing a Automatic Battery Selector Switch artbyjody Gear & Maintenance 24 07-08-2008 07:07 PM
Battery Bank Design Kevin Jeffrey Gear and Maintenance Articles 0 05-12-2003 08:00 PM
Battery Bank Design Kevin Jeffrey Cruising Articles 0 05-12-2003 08:00 PM
Installing a New Battery Bank Sue & Larry Gear and Maintenance Articles 0 09-26-2002 08:00 PM
Boat Battery Power East Penn Manufr. Gear and Maintenance Articles 0 01-18-1999 07:00 PM


All times are GMT -4. The time now is 06:52 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.