|
04-09-2014, 09:05 PM
|
#1
|
Senior Member
Join Date: Jan 2014
Location: Aurora CO
Posts: 2,334
|
Solar while traveling
Boondockers: Any reason why I cant allow my solar panels to charge battery array while driving?
Effective?
__________________
Jim & Kim from Colorado
2014 Eagle 30.5 RLS
2015 Dodge 3500HD SRW 6.7L
Click on my profile for Mods and notes
|
|
|
04-10-2014, 02:46 AM
|
#2
|
Moderator Emeritus
Join Date: Apr 2011
Location: Michigan
Posts: 9,424
|
Interesting question, never really looked into that aspect of solar charging. I guess one issue would be that the panels would normally be positioned "flat" while in tow, thus not angled optimally toward the sun. Not sure how the "electronics" would be handled between the solar system and the low amp charge coming from the 7-pin connection simultaneously.
Let's see what our solar experts have to say......
Bob
__________________
2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)
|
|
|
04-10-2014, 05:52 AM
|
#3
|
Site Team
Join Date: Nov 2012
Location: Clearwater, FL area
Posts: 5,196
|
Quote:
Originally Posted by Jmooney
Boondockers: Any reason why I cant allow my solar panels to charge battery array while driving?
Effective?
|
Our SOLAR runs 24/7, parked or being towed. The TT's battery charge controller has been turned of since adding SOLAR early last year.
The answer is YES and NO. The main concern is how much voltage your SOLAR charge controller outputs. Your TV alternator system produces voltages to MAX of about 14.6 14.8 VDC. The electronics of your TV and TT can handle that voltage. The issue is that some of the inexpensive SOLAR charge controllers output is 15VDC or more (16-17+VDC), and this could have an impact on your electronic devices/micro computers in the TV/TT. As long as your voltage from SOLAR is in the 14VDC range you are ok. There are voltage control units you can purchase that mount between the TV and TT that control the outputs from the TV/TT and SOLAR, and do not allow the higher voltage to feed back to the TV.
Check to see if your SOLAR charge controller has an "Equalization Mode", with a voltage >15VDC. If it does and you can not manually control (on/off) the "Equalization Mode" (on/off) and it runs automatically, do not travel with the solar on.
We travel with the solar on and the Inverter on. We leave the Fridge on and never had an issue. The battery is always charged when we arrive at our destination.
What Solar Charge Controller are you using? Panel output? Just curious..
Good Luck,
Don
|
|
|
04-10-2014, 06:23 AM
|
#4
|
Senior Member
Join Date: Feb 2011
Location: bozeman,montana
Posts: 273
|
since 1995 mine are on 24/7 and never a problem. batteries are always charged!!
__________________
2014 ram 2500 6.4 hemi, 2014 jayco eagle touring edition 28.5 rkds, 2017 jayco 145rb baja edition
|
|
|
04-10-2014, 06:35 AM
|
#5
|
Senior Member
Join Date: Jan 2014
Location: Aurora CO
Posts: 2,334
|
It's my startup kit: Renogy 100w panel that I intend to expand.
The controller is also Renogy, 30 amp, and basic PWM, but I can control the max voltage out.
__________________
Jim & Kim from Colorado
2014 Eagle 30.5 RLS
2015 Dodge 3500HD SRW 6.7L
Click on my profile for Mods and notes
|
|
|
04-10-2014, 08:02 AM
|
#6
|
Senior Member
Join Date: Sep 2011
Location: King George
Posts: 2,761
|
I am still in the planning stages here but would hope I could use the solar panels to charge my TRAILER BATTERIES while en-route to the camp sites.. I am hoping the solar panel controller will act just like the on board converter/charger and keep the battery bank charged.
Not sure what the implication would be having "BOTH" the Truck Alternator Charge line and the Solar Charge line both feeding the same TRAILER BATTERY BANK...
I am guessing this is not going to be any different than having SOLAR PANELS and on-board CONVERTER/CHARGER unit both charging your trailer batteries when hooked up to shore power...
Roy Ken
__________________
Roy and Carolyn
I claim Horse Creek Country in Southern Ill - Momabear is from North Texas
We live in King George VA
RETIRED DOD DOAF DON CONTRACTOR Electronics Tech 42YRS
"We're burning daylight" - John Wayne
2008 STARCRAFT 14RT OFF-ROAD POPUP with PD9260C and three 85AH 12VDC batteries
2010 F150 FX4 5.4 GAS with 3.73 gears - Super Cab - Towing Package - 2KW Honda EU2000i Gen
K9PHT (since 1957) 146.52Mhz
"We always have a PLAN B"
|
|
|
04-10-2014, 02:08 PM
|
#7
|
Senior Member
Join Date: Jan 2014
Location: Aurora CO
Posts: 2,334
|
Dons point is a good one though - the charging volatge from the solar system can be pretty high sometimes, based on the charging mode its in.
If you send + 15V back into your truck system, through the tow vehicle connection for brakes and lights, you can damage electronics on the truck ( EMC for example )
If you can control the charge voltage from the solar contorller, then you can avoid that concern
__________________
Jim & Kim from Colorado
2014 Eagle 30.5 RLS
2015 Dodge 3500HD SRW 6.7L
Click on my profile for Mods and notes
|
|
|
04-11-2014, 09:50 AM
|
#8
|
Senior Member
Join Date: Jun 2010
Location: Saskatoon Sask Canada
Posts: 10,714
|
How or WHY would you stop them from charging while driving? Over the years I have found that although they do charge while driving it is not as efficient as while parked but in 6 years with my solar system I have never turned them off while driving and no it does not harm the truck electrical system.. You do have a charge controller right?
__________________
Seann
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 900watts of solar, Lithium batteries (400amp hour), 2000 watt (4000 surge) whole house inverter.
145days boondockinig in2023 2022/151 2021[/COLOR]
93/2020,157/2019219/2018 206/2017,215/2016, 211/2015, 196/14, 247/13, 193/12
|
|
|
04-12-2014, 11:13 AM
|
#9
|
Senior Member
Join Date: Jan 2014
Location: Aurora CO
Posts: 2,334
|
Quote:
Originally Posted by Seann45
How or WHY would you stop them from charging while driving? Over the years I have found that although they do charge while driving it is not as efficient as while parked but in 6 years with my solar system I have never turned them off while driving and no it does not harm the truck electrical system.. You do have a charge controller right?
|
Yes, controller in place , although an upgrade is needed, but yes in place.
I guess I'm not surprised at the answers, and happy too, but being new to solar, I figured I would ask...
__________________
Jim & Kim from Colorado
2014 Eagle 30.5 RLS
2015 Dodge 3500HD SRW 6.7L
Click on my profile for Mods and notes
|
|
|
04-12-2014, 12:21 PM
|
#10
|
Senior Member
Join Date: Sep 2011
Location: King George
Posts: 2,761
|
Blocking DIODES like in MUSTANG65s solar block diagram is a two edged sword. The Blocking DIODE will BLOCK your DC VOLTAGE coming from the load side from getting back into the solar panels as stated. The DIODE will also drop your DC VOLTAGE going the other way being produced by the SOLAR PANEL by .7VDC.
This probably is not going to be any concern since your SOLAR CONTROLLER is going to put out the smart mode voltages of 13.2, 13.6, and 14.4 to charge your batteries with. This could be a problem however if the SOLAR PANEL DC Volatge feeding the SOLAR CONTROLLER get below the 14.4VDC which would not allow your deep cycle batteries to be charged up to the 90% charge state in a short three hour period of time. I don't think any of the panels will do that anyway since their usuable DC output is only 5-6 AMPS per panel. A typical deep cycle battey will want 14.4VDC at around 15DC AMPS to be able to reach 90% charge state in a short three hour time period according to the battery science we all know now..
Just babbling on here hehe...
Roy Ken
__________________
Roy and Carolyn
I claim Horse Creek Country in Southern Ill - Momabear is from North Texas
We live in King George VA
RETIRED DOD DOAF DON CONTRACTOR Electronics Tech 42YRS
"We're burning daylight" - John Wayne
2008 STARCRAFT 14RT OFF-ROAD POPUP with PD9260C and three 85AH 12VDC batteries
2010 F150 FX4 5.4 GAS with 3.73 gears - Super Cab - Towing Package - 2KW Honda EU2000i Gen
K9PHT (since 1957) 146.52Mhz
"We always have a PLAN B"
|
|
|
04-12-2014, 08:14 PM
|
#11
|
Site Team
Join Date: Nov 2012
Location: Clearwater, FL area
Posts: 5,196
|
Quote:
Originally Posted by RoyBraddy
Blocking DIODES like in MUSTANG65s solar block diagram is a two edged sword. The Blocking DIODE will BLOCK your DC VOLTAGE coming from the load side from getting back into the solar panels as stated. The DIODE will also drop your DC VOLTAGE going the other way being produced by the SOLAR PANEL by .7VDC.
Roy Ken
|
Roy is correct; there is a voltage drop across a blocking diode.
This was one of my concerns when I first decided to add a blocking diode to my panel wiring. I still ordered a 30Amp blocking diode, with the intent to test it prior to installing it. I sat down at the test bench and tried 3 different voltages to see how much the loss would actually be.
Here are the results of my original test (kept them in my Solar note book):
0.18VDC loss @ 12VDC supply voltage (12.33VDC Before, 12.15VDC After diode)
0.2VDC loss @ 24VDC supply voltage (24.5VDC Before, 24.3VDC After diode)
0.3VDC loss @ 31VDC Supply voltage (31.7VDC Before, 31.4VDC After) Actual Solar Panel
I was anticipating a much larger loss based on my research, but since the actual loss was well below what I read, I installed it anyway. Since my solar panel is a high voltage panel (31VDC) I needed to use an MPPT controller, which also gives me an extra 42% of charging power.
The batteries are usually in the “FLOAT” stage by 2PM each (sunny) day. If you do decide to add a blocking diode, be forewarned that they need to be mounted on a heat sink as the do get hot.
Don
|
|
|
|
Thread Tools |
Search this Thread |
|
|
Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
» Recent Threads |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|