Solar Panel output in the shade? - Page 2 - Fiberglass RV
Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×

Thread Tools Search this Thread Display Modes
Old 07-11-2013, 12:15 PM   #21
Senior Member
hotfishtacos's Avatar
Name: Steve
Trailer: 2012 Escape 19' /2010 Honda Pilot 4WD TV
Escondido, California
Posts: 143
I've got 2 panels mounted on my Escape 19 and almost always camp in the sun if we are boon-docking. The trailer is pretty well insulated and I roll the awning out if I want shade. Since most other campers want shade I can almost always get a sunny spot to camp. Even a little shade takes away a lot of solar charging power. For example, about 2" x 12" of shade on the edge of one of my panels from the Maxi-Fan will cut the panel output by 75%. I've since taken care of that by raising my panels. My 95 watt panels put out around 6 amps each in full sun and an overcast day I will sometimes see 1.5 amps or less. If you have solar you want sun. If you have portable panels you can park your trailer in the shade and move your panels into full sunlight...the best option for some. Most solar chargers have a display panel showing charging amps and battery voltage so you don't need any of those aftermarket meters. I bought one and never use it.
"No Generators"
hotfishtacos is offline   Reply With Quote
Old 07-11-2013, 12:44 PM   #22
Senior Member
Steve L.'s Avatar
Trailer: Casita Spirit Deluxe 2003 16 ft
Posts: 1,899
Here's one guy's experiment with repect to how long you have to "rest" a battery before you get an accurate idea of the battery's state of charge. Note also Trojan's opinion of open circuit voltage measuring.

Reader's Digest version: after a little over two minutes on the charger, the battery voltage still wasn't correct after more than 11 hours of battery rest.

Just my (well his) 2 cents worth...

Measuring A Lead Acid Battery State of Charge Photo Gallery by Compass Marine at
Steve L. is offline   Reply With Quote
Old 07-11-2013, 01:50 PM   #23
Senior Member
Name: Ron
Trailer: 2008 13' Scamp
British Columbia
Posts: 325
I've always been aware of the surface charge after charging and I've always used a load like turning on a light etc. to remove it before judgeing the battery state.

Maybe removing the surface charge in an inexact way isn't lab level accurate but at the end of the day my brain converts the battery condition level into a basic poor, fair, good or excellent
Ron in BC is offline   Reply With Quote

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
Solar Panel Set up Question - Grounding the panel? Anne H Electrical | Charging, Systems, Solar and Generators 2 09-07-2012 04:48 PM
solar panel h.mike Care and Feeding of Molded Fiberglass Trailers 4 07-17-2012 09:01 AM
Solar expectations - panel output seems low JohnF Electrical | Charging, Systems, Solar and Generators 18 07-04-2012 03:37 PM
solar panel Judith Kennedy Problem Solving | Owners Helping Owners 2 10-29-2009 11:30 AM

» Upcoming Events
No events scheduled in
the next 465 days.
» Featured Campgrounds

Reviews provided by

All times are GMT -6. The time now is 12:15 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.