Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 08-09-2014, 06:25   #16
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: Living on dirt waiting for our new yacht to be built.
Boat: Half built Bestevaer.
Posts: 10,618
Re: Solar Panels have Voltage but no Current Output.

Quote:
Originally Posted by jseas View Post
Can diodes in the junction box cause this?
No, they are bypass diodes.
__________________

__________________
noelex 77 is offline   Reply With Quote
Old 08-09-2014, 08:47   #17
Registered User
 
MBWhite's Avatar

Join Date: Apr 2012
Location: Illinois
Boat: Hurley Alacrity
Posts: 370
Re: Solar Panels have Voltage but no Current Output.

Quote:
Originally Posted by jseas View Post
All cabling up to the mc4 connectors and pigtails going into the junction boxes have tested good. So it has to be either the connector, pigtail, diodes, or bad panel. I'm going to pull the panels and setup a test bench at home.


Sent from my iPad using Cruisers Sailing Forum
First, to answer your original question on how most panels fail, it is usually a generalized slope downward where output gradually drops, so instead of getting 130 watts in full sun you'll get 100 watts, and a year or 3 later it is down to 90 watts, etc. So a generalized answer for your issue would be that it points to a bad connection, possibly caused by corrosion. It could still be a physical issue at the panel such as a crack in conducting foil, etc but you do not hear about those much, and I would doubt that it would hit 2 panels at the same time. That said, stuff happens so you can never know for certain without testing.

Are there any connections at all in the wiring run between the panels and the junction box? Was there any work at all done on your boat around the time you noticed your panels stopped working?
__________________

__________________
MBWhite is offline   Reply With Quote
Old 08-09-2014, 18:59   #18
Registered User

Join Date: Apr 2007
Posts: 64
Re: Solar Panels have Voltage but no Current Output.

Thank you MBWHITE. That was what I had thought but could never find the exact info. I can't think of anything that had changed. I'll post something when I find out.


Sent from my iPad using Cruisers Sailing Forum
__________________
jseas is offline   Reply With Quote
Old 18-09-2014, 14:35   #19
Registered User

Join Date: Apr 2007
Posts: 64
Re: Solar Panels have Voltage but no Current Output.

Well it looks like both of my panels are bad. I measured at each panel's junction box for short circuit amperage and I get .00 and .03. After reading up on kyocera panels made from 1999 to 2000 it seems they had issues. I bought these used so no way to get them replaced. Looks like I'll shop for new panels. Leaning toward Renogy 100w panels. Probably not made as tough as the kyocera but they are a lot less weight on my davits.


Sent from my iPad using Cruisers Sailing Forum
__________________
jseas is offline   Reply With Quote
Old 18-09-2014, 15:22   #20
Registered User

Join Date: Jul 2013
Location: San Diego, CA
Posts: 3,157
Re: Solar Panels have Voltage but no Current Output.

How long have you had them? Is there any chance that you can take them back? Seems like you were defrauded if they were defective when you bought them.

Please tell me that you tested them when you took possession of them.
__________________
socaldmax is offline   Reply With Quote
Old 18-09-2014, 17:49   #21
Registered User

Join Date: Apr 2007
Posts: 64
Re: Solar Panels have Voltage but no Current Output.

I've only had them about a year. Unfortunately they came from ebay. Tested them when they arrived and got good 6 amps. The only thing I can figure is somehow I damaged them. I have blown a few fuses over the past year so maybe there was some back flow from other panels.


Sent from my iPad using Cruisers Sailing Forum
__________________
jseas is offline   Reply With Quote
Old 18-09-2014, 18:18   #22
Registered User

Join Date: Jul 2013
Location: San Diego, CA
Posts: 3,157
Re: Solar Panels have Voltage but no Current Output.

Sorry to hear that!

Since they're shot, it wouldn't hurt to take a look at the connections between the box and the panel itself, maybe one or the other of the thin strips broke where you can get to it and fix it.

Good luck!
__________________
socaldmax is offline   Reply With Quote
Old 18-09-2014, 18:19   #23
Registered User

Join Date: Apr 2007
Posts: 64
Re: Solar Panels have Voltage but no Current Output.

I assume those connections are under the pink looking epoxy in the photo?


Sent from my iPad using Cruisers Sailing Forum
__________________
jseas is offline   Reply With Quote
Old 18-09-2014, 18:22   #24
Registered User

Join Date: Jul 2013
Location: San Diego, CA
Posts: 3,157
Re: Solar Panels have Voltage but no Current Output.

Quote:
Originally Posted by jseas View Post
I assume those connections are under the pink looking epoxy in the photo?


Sent from my iPad using Cruisers Sailing Forum
I think so. You might have to do some careful digging. I saw some pics of panels where the guy had removed all of the connection boxes for some reason, and there were 2 thin tinned strips coming out of the panel backing right where the 2 inner set of terminal strips are.
__________________

__________________
socaldmax is offline   Reply With Quote
Reply

Tags
current, panels, solar, solar panels

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
Solar Charge Controller Voltage and Current Matching DefinitelyMe Electrical: Batteries, Generators & Solar 4 12-06-2013 09:40
Solar Panel output voltage? John Duckworth Electrical: Batteries, Generators & Solar 7 16-08-2012 15:39
Low Voltage on Solar Panels Meck Electrical: Batteries, Generators & Solar 7 31-03-2011 18:03
Low Voltage Solar Panels SeaKing Electrical: Batteries, Generators & Solar 8 31-08-2010 13:52
REAL output of solar panels ... gramos Electrical: Batteries, Generators & Solar 10 16-11-2008 11:01



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 10:45.


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.