Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 29-01-2012, 11:04   #1
Registered User
xymotic's Avatar

Join Date: Dec 2007
Posts: 1,076
Proper Solar Voltage

Hi all.

I've been chewing up zincs lately, so I thought I'd try unplugging the boat from shorepower for a bit until I can redo the wiring.

Anyway, I installed a solar battery 'maintainer' similar to this one.
SUNFORCE 5 Watt Solar Battery Trickle Charger at West Marine

THe panel is wired to a fuse, has I think a couple of diodes inline and is made to wire straight to the battery. However, in bright light it puts out 21v, which concerns me greatly. don't I run the risk of cooking the batteries at that voltage? These panels don't seem to require a controller, but would one work or is the panel too gutless to even try?

I just want to get by til summer when I can do a proper solar install, and want to spend the least money possible. (so no new batteries would be good
xymotic is offline   Reply With Quote
Old 29-01-2012, 11:25   #2
Nearly an old salt
goboatingnow's Avatar

Cruisers Forum Supporter

Join Date: Jun 2009
Posts: 13,649
Images: 3
Re: proper solar voltage.

at 5W and connected to a reasonable battery bank, teh battery determines the voltage. That 21v is only the open circuit voltage. Its be fine.
Check out my new blog on smart boat technology, networking and gadgets for the connected sailor! -
goboatingnow is offline   Reply With Quote
Old 29-01-2012, 11:29   #3
Registered User

Join Date: Jul 2006
Posts: 3,949
Re: proper solar voltage.

I left one of those hooked up straight into my system when I left the boat in Florida for awhile (plenty of sun) and it was fine. You don't need a controller unless you're attaching it to a pretty small battery.
Kettlewell Cruising
Kettlewell is offline   Reply With Quote


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
Unable to Get a Full Charge Hugh Walker Electrical: Batteries, Generators & Solar 21 16-02-2012 08:40
Cut-Off Point for Solar Panel to Battery Nikos Baillie Electrical: Batteries, Generators & Solar 15 07-10-2011 08:55
14.6vdc Bulk 13.6vdc Float - So What Charge Rate ? MarkJ Electrical: Batteries, Generators & Solar 44 13-09-2011 17:07

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 17:12.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.