solar panel - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 13 Old 07-29-2008 Thread Starter
Member
 
Join Date: Feb 2006
Location: Suburban Philadelphia
Posts: 47
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
solar panel

I plan on leaving my boat in the water over the winter, but I will not have electricity past November. What is your thought on getting a solar panel. I have 2 starter batteries and 4 golf cart batteries for the house?

How do I size my requirements? All help is welcome. Any suggestions on Suppliers would also be helpful.

Alan
alan_21_us is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 13 Old 07-29-2008
moderate?
 
camaraderie's Avatar
 
Join Date: May 2002
Location: East Coast
Posts: 13,877
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 16
     
Alan...you are fairly far north so have poor sun angles and length of day over the winter so you will need to size up a bit to get decent output. I will assume you have NO usage of electric (i.e. bilge pump does not run daily etc.) and are just interested in compensating for the daily loss of charge in wet cell batteries.
You have about 450 amp hours in your house bank and I will assume a group 27 type battery for your starters and say those are roughtly 180 ah's total for a grand total of 630 amp hours.
Wet batteries typically lose 5% of their amp hours in self discharge per month so you will need to replace only about 35 amp hours per month...or about 2 amps per day ON AVERAGE. Given the bleak winter weather and few sunny days in the northeast...I would look at something that is capable of putting in 5 amps per SUNNY day....which would put you into a 20 watt panel normally...but given your location, perhaps something in the 40 watt range would be better.
I don't think supplier makes much of a difference in this case...the Kyocera and BP panels seem to get good reviews but any hard panel should work fine so shop around. Your mounting for the winter should be ANGLED to face the winter sun rather than laying flat on deck. Hope this is helpful.

No longer posting. Reach me by PM!
camaraderie is offline  
Quote Quick Reply Share with Facebook
post #3 of 13 Old 07-29-2008
Senior Member
 
Freesail99's Avatar
 
Join Date: Feb 2006
Location: New Jersey
Posts: 4,507
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
 
Send a message via Yahoo to Freesail99
I may have read this wrong, but a 20 to 40 watt panel would be fine, if he doesn't plan on using his boat or have any other drain on the batteries. A 40 watt solar panel would not re charge his batteries if he went on a night sail, for example.

S/V Scheherazade
-----------------------
I had a dream, I was sailing, I was happy, I was even smiling. Then I looked down and saw that I was on a multi-hull and woke up suddenly in a cold sweat.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Freesail99 is offline  
Quote Quick Reply Share with Facebook
post #4 of 13 Old 07-29-2008
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 14 Times in 12 Posts
Rep Power: 14
         
The panel sizing that Cam is talking about assumes no major shading problems, decent exposure and positioning and prompt removal of snow.

Sailingdog

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

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #5 of 13 Old 07-29-2008
moderate?
 
camaraderie's Avatar
 
Join Date: May 2002
Location: East Coast
Posts: 13,877
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 16
     
Free...I agree...20 watts minimum and 40 watts ideally. Sorry i was not more clear!

No longer posting. Reach me by PM!
camaraderie is offline  
Quote Quick Reply Share with Facebook
post #6 of 13 Old 07-29-2008
Junior Member
 
Join Date: Jun 2008
Location: Karratha Australia
Posts: 25
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Is it not possible to take the batteries ashore and keep them on a charger there?
Uglydave is offline  
Quote Quick Reply Share with Facebook
post #7 of 13 Old 07-29-2008
Senior Member
 
chucklesR's Avatar
 
Join Date: Sep 2007
Location: Pasadena Md - Magothy side
Posts: 5,979
Thanks: 10
Thanked 31 Times in 31 Posts
Rep Power: 10
     
Go with a 40 and it'll even help during the sailing season by getting that last little bit topped off while the boat sits around between sailing days.
Upsize that appropriately if 'on the water' means at a mooring ball and if you have to run anchor lights for safety or bilge pumps due to known conditions of your boat.

My 80w panel tops me off and keeps me there year round all of 50 miles south of you. It's not that 'bleak' I've never used my charger or run my diesel just to charge but my banks are 1/3 yours (210 ah).
chucklesR is offline  
Quote Quick Reply Share with Facebook
post #8 of 13 Old 07-29-2008 Thread Starter
Member
 
Join Date: Feb 2006
Location: Suburban Philadelphia
Posts: 47
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Thanks to all - I will go and start my internet search for the best value. Installation will be tough, but I think I can get some help. I will go for the 40 amps.

Alan
alan_21_us is offline  
Quote Quick Reply Share with Facebook
post #9 of 13 Old 07-29-2008
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 14 Times in 12 Posts
Rep Power: 14
         
Solar panels are usually sized in WATTS... and you want a 40 WATT panel. It will provide about TWO-AND-A-HALF AMPS during the middle of the day, on a sunny summer day.

Quote:
Originally Posted by alan_21_us View Post
Thanks to all - I will go and start my internet search for the best value. Installation will be tough, but I think I can get some help. I will go for the 40 amps.

Alan

Sailingdog

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

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #10 of 13 Old 07-30-2008
Senior Member
 
eMKay's Avatar
 
Join Date: Aug 2007
Location: Buffalo
Posts: 838
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
 
I bought a 45 watt panel at WM last month for $80, for installation I set it on top of the sliding hatch, it has rubber feet on it so I jst put it in the cabin while sailing.


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


Technician, RCR Yachts Buffalo.
eMKay is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome