Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 11-12-2009, 00:20   #1
Moderator
 
Boracay's Avatar

Cruisers Forum Supporter

Join Date: Feb 2004
Location: Pelican Bay, Great Sandy National Park
Boat: Steel Roberts Offshore 44
Posts: 5,175
Images: 18
Fusing Solar?

I am currently putting a couple of 10W solar cells onto Boracay to trickle charge the batteries and I know I need fuses/circuit breakers. I just don't know how big, what type and where they go.

Solar Cell 1 is to charge the start battery. This battery also runs the electric automatic bilge pump.

Solar cell 2 is to charge the house batteries (currently 2 x 220 amp. hour 6V Trojans, but may expand up to 10 x 220 amp. hour 6V Trojans). Long term I'm planning to add a few large panels up to a maximum of (say) 300W. This circuit will probably run the fridge/freezer (Danfos 35? with 6" of foam) and may also have to accept power from a wind generator.

I'm also curious about the diodes. I got two from the chandler, seem to work fine, just wonder about voltage drop (0.2V currently) and whether the battery voltage can "back flow" at all. (I put them in backwards and found voltage differences of 4V and 6V when connected across the 10W solar cell)
__________________

__________________
Rust never sleeps
Boracay Blog.
Boracay is offline   Reply With Quote
Old 11-12-2009, 02:03   #2
Long Range Cruiser
 
MarkJ's Avatar

Cruisers Forum Supporter

Join Date: Dec 2007
Location: Australian living on "Sea Life" currently in England.
Boat: Beneteau 393 "Sea Life"
Posts: 12,828
Images: 25
Chris, I think you will find all panels come with diodes installed in the cute lil black box.
Jaycar sell car fuse things that clip in loine. Miine cost about $5 I think.

Mniie are now up and working! Yippee!
__________________

__________________
Notes on a Circumnavigation.
OurLifeAtSea.com

Somalia Pirates and our Convoy
MarkJ is offline   Reply With Quote
Old 11-12-2009, 04:14   #3
Moderator
 
Boracay's Avatar

Cruisers Forum Supporter

Join Date: Feb 2004
Location: Pelican Bay, Great Sandy National Park
Boat: Steel Roberts Offshore 44
Posts: 5,175
Images: 18
El Cheapo...

My panels were cheap and small. I looked, no diodes.

For the start battery I think I can get away with an inline 5 or 10 amp fuse close to the battery, but I suspect I'll need something more serious near the house batteries.
__________________
Rust never sleeps
Boracay Blog.
Boracay is offline   Reply With Quote
Old 11-12-2009, 04:36   #4
Senior Cruiser
 
44'cruisingcat's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 7,452
Images: 69
A 10 Watt panel is going to make little impression on keeping 220 amp-hour batteries charged. And if there are no diodes, you'll lose more overnight than you gain during the day.

Simple in-line fuses should do, but fit diodes too. For a 10 Watt panel a 1 amp fuse would be enough. Current = Watts divided by volts, ie 10/12= 0.833 amps.

5 amp fuses will be plenty.
__________________
44'cruisingcat is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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 Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Looking for Solar Still weedeater64 Provisioning: Food & Drink 5 17-12-2013 18:57
Fusing the Battery Cable sailingharry Electrical: Batteries, Generators & Solar 44 07-10-2009 18:42
Only Solar Skylark Electrical: Batteries, Generators & Solar 116 29-07-2008 12:52
solar 21 just about to be first solar/electric powered boat to cross atlantic schoonerdog Multihull Sailboats 2 07-02-2007 10:04



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 23:58.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.