SailNet Community - Reply to Topic

   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 > Solar battery chargers
 Not a Member? 


Thread: Solar battery chargers Reply to Thread
Title:
  

By choosing to post the reply below you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

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:

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.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
04-07-2008 01:59 AM
Isaac-1
Quote:
Originally Posted by camaraderie View Post
OK...so you're saying get a 40w poly panel instead of a 20w amorphous panel of the same surface area. No problem with that other than price and complexity of installation...but a longer life and more power too.
Compared to most boat projects a 40 watt , or even an 80-100 watt solar panel (if you have the space) and charge controller are relatively cheap, assuming you are somewhat handy and plan to do it yourself, and buy mail order from solar panel supply companies not marine supply companies, I bought my 55 watt panel as a cosmetic blemish for only about $200 from sunelec.com a few years ago, and will likely buy from them again. A 30-40 watt panel, charge controller, wiring and mounting materials would probably cost under $250 and a 100 watt panel could probably be installed for only $550 or so. One thing to remember is solar panels keep getting higher and higher engergy densities, one of todays 50 watt panels is the size a 20-30 watt panel was just a few years ago.

Ike
04-06-2008 01:33 PM
sailingdog More power is always a good thing... Yes, he'll probably need a charge controller, but unless he's planning on going solar in a big way, he can get away with something like the FlexCharge NC25A for that.

04-06-2008 01:29 PM
camaraderie OK...so you're saying get a 40w poly panel instead of a 20w amorphous panel of the same surface area. No problem with that other than price and complexity of installation...but a longer life and more power too.
04-06-2008 01:02 PM
sailingdog CAM-

That is why I said:

Quote:
much lower power generation capacity than a hard polycrystalline panel of the same surface area.
Many boats are going to have trouble finding the space required by a 40 Watt amorphous panel, but might be able to fit a 40 watt polycrystalline panel fairly easily.

A polycrystalline 40 Watt panel is about 26" x 21", where a 40 Watt amorphous silicon panel is going to be about 48" x 21"...almost twice as large.
04-06-2008 12:15 PM
camaraderie Dawg...are you saying that a 40 watt panel of amorphous does not give the same output as a 40 watt panel of poly? My understanding is that more AREA of panel is needed to produce the 40 watts from amorphous but that the output is the same (or slightly better in low light/low angle of incidence) with amorphous.
04-06-2008 08:37 AM
sailingdog Izzy-

The flexible panels are amorphous silicon and have a much lower power generation capacity than a hard polycrystalline panel of the same surface area. IMHO, you'd be better off getting a 40-60 Watt polycrystalline panel and mounting it. However, you may need a charge controller for a larger panel, but it depends on your battery bank size.
04-05-2008 10:40 PM
camaraderie Izzy...for on the mooring use a 20watt panel should put in 6-8 amp hours per day or roughly 30-40 amphours a week.
Your radio,cabin lights, anchor light, bilge pump etc. probably use about that many amp hours per day you are on board so 20 watts is really pretty minimal.
You can get a much more precise idea of your electrical use by clicking on the spreadsheet link on this page:
Southeast Marine Services :: Technical Information :: Battery Bank Sizing
Hope this helps.
04-05-2008 09:07 PM
Izzy1414
Solar battery chargers

We use our boat for a couple days at a time on a mountain lake with it moored on a ball in between uses. The down time ranges from several days (typical) to several weeks (unacceptable).
04-05-2008 08:41 PM
camaraderie IZZY...welcome. It sounds like you are just looking to recharge your batteries during the week rather than have a charging system for daily cruising use. Correct?
Flexible panels are OK for such use but it is the wattage output of any panel that will matter. I suggest no smaller tha 20 watts for keeping batteries recharged during the week. To be of better help we need to know more about your use of the boat and the SIZE of the battery bank.
04-05-2008 08:35 PM
Izzy1414
Solar battery chargers

My power consumption is relatively small on our 26 foot pocket cruiser. Just depth sounder, stereo, nav lights, etc. There is just not that much chance to charge the batteries with the motor when the wind beckons.
This thread has more than 10 replies. Click here to review the whole thread.

 
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


All times are GMT -4. The time now is 09:00 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.