Solar panel sizing - 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 03-25-2009
Junior Member
 
Join Date: Nov 2008
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
captainVT is on a distinguished road
Solar panel sizing

Will be using Minn Kota Endura 30 electric motor on dingy. What size solar panel would be sufficient to charge 12V Interstate Marine 24M. Would a low cost trickle charge been sufficient? Anticipated use will be limited to shore to mooring travel. Battery housed in case w/meter. Assume I would also need charge control to avoid over charging.
Reply With Quote Share with Facebook
  #2  
Old 03-25-2009
camaraderie's Avatar
moderate?
 
Join Date: May 2002
Location: East Coast
Posts: 13,877
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 15
camaraderie is a jewel in the rough camaraderie is a jewel in the rough camaraderie is a jewel in the rough
You have about an 80 amp hour battery. This means you can use 40ah's before recharging. What you don't say is how many amps your motor draws...how long you use it for...and how long the panel will have to recharge your battery between use.

Let's say we find that you use ALL 40 amphours each weekend and have 5 days to put the amp hours back in. You would need a panel that could supply 8 amp hours ON AVERAGE each day. Using the 4X rule...that would mean you would need a 32 watt panel. Assuming some rainy days would suggest a 40watt panel might be a good size.
On the other hand...if you only use 5ah's a weekend...you just need something that can put in 1amphour a day...a 5-10 watt panel and no regulator needed.
Put an amp meter on your motor to understand power use if the manual doesn't state it. Then figure how LONG you use it and you will have the amphours you need to replace.


And yes...you do need to get a cheap regulator to be safe with larger size size panel with peak voltage over 15V.
__________________
No longer posting. Reach me by PM!
Reply With Quote Share with Facebook
  #3  
Old 03-25-2009
Junior Member
 
Join Date: Nov 2008
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
captainVT is on a distinguished road
1:1 ratio on ah's to thrust. So I assume 30ah, lets say conservatively 15min day, max, unless cruising around anchorage, so 7+/- daily usage. So, yes 5-10 trickle charge panel should suffice once full charge is done. Plus, I would not anticipate more than 4 consecutive days of use.

Thanks. Do you have a particular brand in mind?
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
A Little Help from the Sun Don Casey Cruising Articles 0 12-20-2001 07:00 PM
Choosing and Installing Solar Panels Sue & Larry Gear and Maintenance Articles 0 11-06-2000 07:00 PM


All times are GMT -4. The time now is 10:44 PM.

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.