Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 28-03-2014, 18:26   #1
Registered User

Join Date: Mar 2014
Posts: 40
Switches and fuses

For some reason i am hesitating over the switching for panels.

The panels are 330w, nominal current a shade under 6 amps, nominal 54v. The panels run to an outback controller - flexmax 80. Whats a sensible rating for the switch for each panel, and should the switch be fused?

The contoller charges a 800ah battery bank, with definitely 2 and possibly three panels wired in.

Again what would be a sensible rating for the switch between controller and batteries and should it be fused?

I am not comvinced of the need for fusing all the switches?
__________________

__________________
Ip485 is offline   Reply With Quote
Old 29-03-2014, 06:12   #2
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,572
Images: 240
Re: Switches and fuses

Greetings and welcome aboard the CF, Ip485.
__________________

__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is online now   Reply With Quote
Old 29-03-2014, 06:34   #3
Senior Cruiser
 
skipmac's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Location: 29 49.16 N 82 25.82 W
Boat: Pearson 422
Posts: 12,368
Re: Switches and fuses

The output from the panels is fairly low so as long as you have wiring large enough to handle the panel output a fuse is not necessary for the panels. BUT, the wire will be connected to the battery and if the wire shorts out that will short the full battery output.

I would fuse the charger connection to the battery and not the switch that controls the panel output. My preferred method for fusing connections to a battery is a Blue Sea Systems battery terminal fuse.
__________________
The water is always bluer on the other side of the ocean.
skipmac is offline   Reply With Quote
Old 29-03-2014, 17:48   #4
Registered User

Join Date: Jun 2013
Location: canada
Posts: 1,688
Re: Switches and fuses

fuse the controller wire close to the battery. I don't know why you need switches.

I would probably fuse each panel near the controller just for reliability. that way if one panel wire shorted. it would only take out that fuse and the other panels would still be charging. otherwise it would take out the main fuse and stop all. and if you wanted to stop one panel you could pull the fuse. don`t see the need for switches.
__________________
smac999 is offline   Reply With Quote
Old 30-03-2014, 09:56   #5
Registered User
 
mariner36bob's Avatar

Join Date: Mar 2014
Location: Casco Bay Maine
Boat: Mariner 36
Posts: 170
Re: Switches and fuses

I'm switching a single 8A panel with a 15 amp SPST switch at the helm. The switch (and a fuse) will be on the battery side of the controller. At the helm was the most logical location for us. When at the helm, prior to turning the ignition key, I can turn Off the solar panel feed and charge from the alternator charge. When time to sail, turn off ignition and turn on Solar. I've read on this forum of alternator cycling, due to it sensing the solar feed, potentially causing premature failure of the alternator. Our alternator is very old so not causing it undue stress was/is a consideration.
__________________
mariner36bob is offline   Reply With Quote
Old 30-03-2014, 10:38   #6
Marine Service Provider

Join Date: Sep 2008
Location: Victoria B.C.
Boat: CS27
Posts: 1,725
Re: Switches and fuses

The fusing close to the positive post is necessary. The switch is not needed.
__________________

__________________
mitiempo is offline   Reply With Quote
Reply

Tags
fuses

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
For Sale: Kraus and Naimer AC Selector Switches memelet Classifieds Archive 20 08-10-2012 15:34
For Sale: Kraus and Naimer AC Selector Switches - $90 memelet Classifieds Archive 0 06-07-2012 20:50
Revised Diagram . . . Cables and Fuses Correct? davisr Electrical: Batteries, Generators & Solar 24 15-06-2012 11:52
Wiring Batteries (Fuses, Switches, Wind Gen etc.) pressuredrop Electrical: Batteries, Generators & Solar 12 04-08-2009 07:37
Grey Water Sumps, Pumps and Johnson Ultima Float Switches akio.kanemoto Plumbing Systems and Fixtures 34 19-04-2009 13:32



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 04:29.


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.