Go Back  The Hull Truth - Boating and Fishing Forum > BOATING FORUMS > Marine Electronics Forum
Reload this Page >

Need a suitable battery for LED floodlights on SUP

Notices
Marine Electronics Forum

Need a suitable battery for LED floodlights on SUP

Old 10-11-2014, 02:54 PM
  #1  
Senior Member
Thread Starter
 
Join Date: Apr 2012
Posts: 150
Received 4 Likes on 1 Post
Default Need a suitable battery for LED floodlights on SUP

I found these flood lights for a reasonable price on Amazon and I think I can rig them pretty easily to my SUP (Stand Up Paddleboard) for night paddling: 42W LED Flood Light.

They got good reviews and are super bright -

Question: what type of battery will I need to light these puppies up? I'm trying to go a lightweight as possible yet get a couple hours of light and also be rechargeable. Originally I was thinking a typical deep cycle 12 volt like I have on my boat. Very heavy. Then I was looking at some of these smaller sealed 12v lead acid batteries. But someone wrote in a comment that these may be underpowered for two 42W floodlights. I'm not up on my watts, volts and amps - - - could someone please help on this subject? My cooler seat and board are certainly capable of handling a heavy battery but I want to minimize as much as possible. Thanks.

Oh - I may also use some underwater LED lights on the sides of the board as well - so I need a battery to put it all together.
Old 10-13-2014, 06:38 AM
  #2  
Senior Member
Thread Starter
 
Join Date: Apr 2012
Posts: 150
Received 4 Likes on 1 Post
Default

anyone?
Old 10-13-2014, 06:53 AM
  #3  
Admirals Club Admiral's Club Member
 
Join Date: Jun 2008
Location: Tampa, FL
Posts: 979
Received 30 Likes on 17 Posts
Default

Far from a battery expert, but since no one else is responding....

Very rough calculations:

42Wx2 = 84W
84W/12V = 7A
How many hours do you want it to last?
4hours?
4hx7A = 28Ah
For reference, the smallest Optima Bluetop is 50Ah.
Of course, you need some reserve, as you should avoid completely discharging a battery.

Perhaps a small AGM from batteries plus?

On a side note, 84W of LED is going to be extremely bright...probably a WHOLE lot brighter than you think. I don't have the exact numbers, but that should be roughly the equivalent of 700W of incandescent bulbs. (I only use 300W incandescent to illuminate my entire back yard. )
Old 10-13-2014, 08:08 AM
  #4  
Senior Member
Thread Starter
 
Join Date: Apr 2012
Posts: 150
Received 4 Likes on 1 Post
Default

Thank you. That is the 'math' that I was looking for. I'm not sure I want to spend over $200 for the bluetop but I am going to look into the smaller options at batteries plus.
Old 10-13-2014, 08:16 AM
  #5  
Senior Member
Thread Starter
 
Join Date: Apr 2012
Posts: 150
Received 4 Likes on 1 Post
Default

http://www.batteriesplus.com/product...erker/12V.aspx
Old 10-13-2014, 08:39 AM
  #6  
Admirals Club Admiral's Club Member
 
Join Date: Jun 2008
Location: Tampa, FL
Posts: 979
Received 30 Likes on 17 Posts
Default

I would never recommend to anyone to buy an Optima. That was for reference only.

The battery you linked to is probably a good option.
Old 10-13-2014, 09:43 AM
  #7  
Admirals Club Admiral's Club Member
 
Join Date: Mar 2011
Location: Canada
Posts: 3,975
Likes: 0
Received 337 Likes on 282 Posts
Default

How do you keep it dry?... You can't roll a car battery into the water.

Get yourself a contained unit. Like a 2000 lumen bike light with cable and inclosed battery case.

Last ~ 4 hours off a case weighing a few pounds

Or just get a bright headlamp.
Old 10-13-2014, 10:07 AM
  #8  
Admirals Club Admiral's Club Member
 
Join Date: Jun 2008
Location: Tampa, FL
Posts: 979
Received 30 Likes on 17 Posts
Default

If you are not dead set on the setup your are pursuing, I would recommend listening to smac999. Figure out a way to mount a waterproof self-powered light like a dive light.
Old 10-13-2014, 12:35 PM
  #9  
Senior MemberCaptains Club Member
 
Join Date: Feb 2005
Location: Falmouth, MA
Posts: 6,184
Received 689 Likes on 426 Posts
Default

You might want to consider a waterproof LED headlight with integral rechargeable lithium ion battery. Amazon has a wide selection.
Old 10-13-2014, 01:35 PM
  #10  
Senior Member
Thread Starter
 
Join Date: Apr 2012
Posts: 150
Received 4 Likes on 1 Post
Default

I have a Yeti cooler as a seat and can easily store a battery (of reasonable weight and size) inside the cooler. I run a wire cable through the drain plug on the side and into the aluminum rack to the light pole.

Old 10-17-2014, 01:20 AM
  #11  
Senior Member
 
Join Date: Jul 2013
Posts: 4,391
Received 379 Likes on 226 Posts
Default

I also think you chose the wrong tool for the job. One of the integrated dive light style setups or submersibles that runs on 3.7 to 7.4 volt lithium battery packs would be ideal IMO.
Old 10-17-2014, 04:29 PM
  #12  
Senior MemberCaptains Club Member
 
Join Date: Nov 2002
Location: Pensacola, Fl
Posts: 12,272
Received 603 Likes on 440 Posts
Default

For battery size the U1 you linked to is fine. I used a similar U1 for many years as the primary battery on an 12 1/2' RIB. Ran navigation lights, started 15 and 25 hp outboard and depth sounder.

But that much light on a SUP? You are blinding yourself--and perhaps other boaters. All you are required to have is a flashlight to show another boat as it approaches. Take that up one notch, and get a all around anchor light in LED--uses 90 milliwatts (same one I use on my boats). This is visible for 3 miles in most circumstances. You can use a small AGM motor cycle battery, much smaller and lighter than the U1.

For looking around, get a good waterproof head light- if you want lots of power--then a bike head light, along with rechargeable battery for $40. But…I don't think you will win any popularity contests with boaters along your route if you go with the original lights--it will blind them.
Old 10-17-2014, 04:42 PM
  #13  
Senior Member
Thread Starter
 
Join Date: Apr 2012
Posts: 150
Received 4 Likes on 1 Post
Default

Ha. Yes. I am way overlit. The purpose, however, is to go night crabbing and attract a host of night dwelling critters to my board. That's why I'm going ultra bright.
Old 10-30-2014, 10:36 AM
  #14  
Senior Member
Thread Starter
 
Join Date: Apr 2012
Posts: 150
Received 4 Likes on 1 Post
Default

Thanks for the help guys. I got it figured out and rigged up. Made a litte 5 min video if anyone'e interested.

SUP Crabbin on the Nighthawk-2000
Old 10-30-2014, 10:57 AM
  #15  
Admirals Club Admiral's Club Member
 
Join Date: Jun 2008
Location: Tampa, FL
Posts: 979
Received 30 Likes on 17 Posts
Default

Pretty sweet. My wife's been wanting an SUP...now I have a reason to get her one.

Any pics on how you rigged it?
Old 10-30-2014, 08:59 PM
  #16  
Junior Member
 
Join Date: Oct 2014
Posts: 23
Received 0 Likes on 0 Posts
Default

Have you looked at these lights yet?

http://nocqua.com/shop/
Old 10-30-2014, 09:27 PM
  #17  
Junior Member
 
Join Date: Oct 2014
Posts: 23
Received 0 Likes on 0 Posts
Default

Nvm, I just saw your video. Really cool setup by the way
Old 10-31-2014, 07:03 AM
  #18  
sbd
Senior Member
 
Join Date: Sep 2009
Posts: 619
Likes: 0
Received 1 Like on 1 Post
Default

Always love it when a "weird" post goes right! Cool set up and video. Looks super fun.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.