solar overcharge? - 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 > General Interest > General Discussion (sailing related)
 Not a Member? 


Reply
 
LinkBack Thread Tools
  #1  
Old 01-16-2011
Junior Member
 
Join Date: Jan 2010
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
riversteve is on a distinguished road
solar overcharge?

Is there any danger of overcharging with a small,(1/2 sq ft) charger in the winter?
Reply With Quote Share with Facebook
  #2  
Old 01-16-2011
BudgieSmugglers's Avatar
Member
 
Join Date: Jan 2011
Posts: 31
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
BudgieSmugglers is on a distinguished road
it depends on the size of your battery, but with a 5 watt solar panel, even a 25 amp battery should be safe without a regulator. to be sure, just check the voltage of the battery with a multimeter at about 2pm on a sunny day. if it reads under about 14 volts it should be o.k. most batteries will take about 14.2 volts.. i would be surprised that with your solar panel, (which sounds like about 1 to 2 watts) that the voltage will be above 13 volts,even on a 15 amp battery
__________________
stuck in broken bay building up funds to fix my just bought adams 24. intend sailing eastcoast australia, if i can ever pluck up the courage to go outside the heads!!

Last edited by BudgieSmugglers; 01-16-2011 at 04:29 PM.
Reply With Quote Share with Facebook
  #3  
Old 01-16-2011
LakeSuperiorGeezer's Avatar
Senior Member
 
Join Date: Oct 2010
Posts: 551
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 4
LakeSuperiorGeezer is on a distinguished road
Overcharge?

That's about six watts maximum. I do not know what latitude you are, but if you figure six hours of daylight with the solar panel pointed the sun at noon, and then lets say you get half the rated amount as the panel is not always directly pointed at the sun, that comes to less than a watt in 24 hours average. That computes to about 60 milliamps at 13 volts. The internal discharge rate for a hundred amp-hour battery is going to be near 60 milliamps for an older battery, so I would say you could get away with no regulator. It would certainly be better than no panel at all where you would have sulfation of the battery over the winter and loose about half the capacity of the battery. Two winters and you need a new battery.

Last edited by LakeSuperiorGeezer; 01-16-2011 at 04:32 PM.
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
Solar Vent Fan - Where to Put It? montenido Gear & Maintenance 14 10-08-2010 11:23 AM
Solar Stik Freesail99 Gear & Maintenance 21 10-24-2007 05:12 PM
think they use solar ? sailusvi General Discussion (sailing related) 0 10-08-2007 08:12 PM
solar panels GREGGWARREN Gear & Maintenance 3 08-27-2007 12:25 AM
Solar Panels bottleinamessage Jeanneau 0 08-16-2007 07:10 AM


All times are GMT -4. The time now is 09:31 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.