Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > MOTORHOME FORUMS > MH-General Discussions & Problems
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 08-01-2021, 04:46 PM   #1
Join Date: Nov 2019
Posts: 32
Solar not charging

My coach batteries were nearly depleted when I went to get my ACE 27.2 out of storage for a trip. Last there about a month ago. I have 200 W of Renogy solar panels. It has a PWM 30 amp controller, which has functioned well. Now, it reads only 9-10v output PV. This is sunny mid day SoCal. I took off the solar wires from the controller, they read 18-19v. I got up on the roof, checked each panel, 18-19v. I replaced the controller, same result. The only thing I can think of that is different is I installed a Renogy battery monitor last year. Not sure Iíve look at the controller since that time. Monitor seems to work, although the parasitic drain, at >.5-.6 amps. Any suggestions?
richguess is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free! RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 08-01-2021, 06:02 PM   #2
Senior Member
Jim_HiTek's Avatar
Join Date: Nov 2011
Location: Full time RV'er
Posts: 3,877
Yeah, I think you should contact Renolgy. You've got good info, let their techs mull it over a while.
'02 Winnebago Journey DL, DSDP, 36' of fun.

Visit my RV Travel & Repair Blog at :
Jim_HiTek is offline   Reply With Quote
Old 08-02-2021, 01:48 PM   #3
Senior Member
Join Date: Sep 2020
Posts: 246
Unhook battery monitor and see what voltage you have on the batteries themselves.
ROUGHRIDER3 is offline   Reply With Quote
Old 08-02-2021, 03:40 PM   #4
Senior Member
rffowler55's Avatar
Join Date: Feb 2020
Location: North Georgia Mountains
Posts: 341
We have an off-grid solar power system at home and it is possible that your controller and battery monitor are limiting the power to the batteries to prevent them from over charging. If that is the case, it is working properly, and I experience this same situation every day during peak production hours when my solar input exceeds my power consumption and the controller, which receives it's battery state of charge data from the battery monitor, slows down the volts going into the battery to, again, preserve the batteries. An easy way to check is to put the system under a load that exceeds the solar arrays input and see if the solar array volts and the controller volts approach parity.
2007 Newmar Baystar; 3201; miniature schnauzers and labradoodle. SumoSprings Front; Safe-T-Plus;2016 Fiat 500; Roadmaster Falcon 2;Demco SBS DUO Braking System;TST 507;Bilstein shocks; Garmin RV 785
rffowler55 is offline   Reply With Quote
Old 08-02-2021, 03:50 PM   #5
Senior Member
Marine359's Avatar
Join Date: May 2021
Location: Asheville, NC
Posts: 370
When you test across panel leads, you’re testing Voc (open circuit). Voc on a 100w panel should be about 22v.
Jim. 2021 Canyon Denali 4x4 3.6L, Husky C-Line
2021b Micro Mini 2108DS, 170AH LiFePo4, Xantrex XC2000, 110w Solar Suitcase, Champion 2500w df
Marine359 is offline   Reply With Quote
Old 08-03-2021, 08:08 PM   #6
Junior Member
Join Date: Aug 2021
Posts: 6
I also have a renogy charge controller on 200w of panels that has went out. They are cheap, that would be my guess. Or a dead battery, if all the wiring is tight and correct. worth triple checking wiring
Ryan0104x is offline   Reply With Quote
Old 08-19-2021, 07:01 PM   #7
Join Date: Nov 2019
Posts: 32
I did replace the controller, no change. Took it to shop, they went thru everything, talked to several people at Renogy. The last engineer an Renogy said to change from parallel to series wiring of the panels if the run to the controller was more than 10í. Mine easily was. They connected the panels in series, that solved it. Renogy said if I had more wattage (400 W) then go back to parallel. My batteries are holding a charge, so I guess they didnít get trashed when they ran down.
richguess is offline   Reply With Quote

charging, solar

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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
"Charging Station" USB chargers not charging scottandanna Forest River Owners Forum 28 06-24-2015 07:11 PM
Solar charging panel not working bertman Winnebago Industries Owner's Forum 10 11-23-2013 10:28 AM
Need Help Solar not charging batteries CWIL Technology: Internet, TV, Satellite, Cell Phones, etc. 5 09-21-2012 04:16 PM
charging system not charging carguru1 Vintage RV's 1 08-16-2011 09:10 AM
Charging System Not Charging scaragon Travel Trailer Discussion 22 08-06-2009 10:41 AM

» Featured Campgrounds

Reviews provided by

All times are GMT -6. The time now is 01:14 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.