Good Sam Club Open Roads Forum: Tech Issues: Solar charge to chassis battery
Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Tech Issues

Open Roads Forum  >  Tech Issues

 > Solar charge to chassis battery

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
D.E.Bishop

Eagle Rock, CA

Senior Member

Joined: 08/09/2001

View Profile



Good Sam RV Club Member

Offline
Posted: 10/15/20 08:58am Link  |  Quote  |  Print  |  Notify Moderator

I have a WindyNation system, 200 watts and it has functioned flawlessly since we installed it.

My Winnie's battery charging system is such that it isolates the chassis and house systems unless the engine is running. I don't want to change the Winnie system but I would like to periodically charge the chassis battery while the rig is in storage between trips.

I bought a small 12 vdc seven day a week timer that has a 30 amp rated relay. My intent is to charge the house battery using the solar output every other day for 1 hour(or as needed) using the timer.

So my question is, should I put a high amperage diode in the charging line from the relay?

I guess that I should have stated that the 200 watts is not for maintenance. We do quite a bit of no hookup camping. Not always boondocking, just no hookups. As long as I have 200 watts which will more than maintain my batteries and a 30 amp controller, I just thought that might as well keep the chassis battery topped off. I do not want to bypass or modify the Winnie charging system.

* This post was edited 10/15/20 09:27pm by D.E.Bishop *


"I travel not to go anywhere, but to go. I travel for travel's sake. The great affair is to go". R. L. Stevenson

David Bishop
2002 Winnebago Adventurer 32V
Back to a 2006 Suzi GV
Roadmaster 5000
Roadmaster Invisibrake


mr_andyj

Georgia

Full Member

Joined: 11/13/2004

View Profile



Posted: 10/15/20 09:21am Link  |  Quote  |  Print  |  Notify Moderator

For maintaining batteries 200 watts is a lot. You should have no problem maintaining both house and chassis batts together all winter.
Bypass the solenoid that connect/disconnects the house and chassis batteries and keep the two connected all winter while in storage and let the solar charge.
Probably would be better to alternate charging the starting batteries and the marine or deep cycle batteries from each other as each will have different needs, but in the end the batts will be just getting a "float" charge anyway.
In my class c all I did was put a 15 watt panel on the dash board, parked facing south, and plugged that into a DC outlet that was connected to the battery (not through the ignition). This worked perfect for me, but I live far south in GA so had enough sun.

All motorhomes will isolate the house and chassis batts while the engine is off. They do this by using a big diode or by using a solenoid switch.
There is no reason for you to put a solenoid in while charging.
The Windy Nation system hopefully has a diode to keep the batteries from discharging back into the solar panels at night and this is the only diode that is needed for charging while in storage.

I have seen many motor homes have the solenoid right there at the chassis battery. You could literally jump over the solenoid. Make a wire with ring terminals on each end, long enough to jump over the solenoi. One end to the "out" going to the house batts, and one end on the "in" coming from the chassis batt and this will have the effect of the solenoid always being on.
Maybe someone else chime in if this would ever create a dangerous situation if the motor was cranked with the solenoid "jumped". I would just not ever crank motor wiht it jumped.

You could also, safer, take a 12v+ feed from the output of the solar panel, before the charge controller, and send it to the switch that turns "on" the solenoid, and this would turn it on in the daytime and off at night. Be-warned, though, that the solar panel will put out 18 volts, not 12. I am not sure if the solenoid will tolerate 18 volts or not. It might be fine, might not. That 18v could also back-feed into other vehicle components somehow...
Getting more complicated, you would pull the 12volts after the charge controller to the solenoid switch, but send the voltage to the house battery through a diode to prevent the house battery from always powering the solenoid.

Many ways to get to the same end. Your timer will work also.

Lwiddis

near Bishop, California

Senior Member

Joined: 08/12/2016

View Profile



Good Sam RV Club Member

Offline
Posted: 10/15/20 09:39am Link  |  Quote  |  Print  |  Notify Moderator

I maintain two Trojan T125s with a 30 watt panel mounted on top of my TT cover. $23 WindyNation weatherproof controller.


Winnebago 2101DS TT & 2020 Chevy Silverado 1500 LTZ Z71, 300 watt solar-parallel & MPPT, Trojan T-125s. TALL flag pole. Prefer USFS, COE, BLM, NPS, TVA, state & county camps. Bicyclist! 14 year Army vet-11B40 then 11A - (MOS 1542 & 1560) IOBC & IOAC grad


time2roll

Southern California

Senior Member

Joined: 03/21/2005

View Profile



Good Sam RV Club Member


Posted: 10/15/20 09:49am Link  |  Quote  |  Print  |  Notify Moderator

Make it all automatic with a Trik-L-Start combiner. Everything stays isolated while in use. When the solar or converter is powered up it will send up to 5 amps to the chassis start battery.

http://www.lslproducts.net/TLSPage.html

* This post was edited 10/15/20 12:16pm by time2roll *


2001 F150 SuperCrew
2006 Keystone Springdale 249FWBHLS
675w Solar pictures back up

Dusty R

Charlotte Michigan 48813

Senior Member

Joined: 04/05/2003

View Profile


Offline
Posted: 10/15/20 11:01am Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

Make it all automatic with a Trick-L-Start combiner. Everything stays isolated while in use. When the solar or converter is powered up it will send up to 5 amps to the chassis start battery.

http://www.lslproducts.net/TLSPage.html


X-2

Dusty

Ed_Gee

Central Oregon coast

Senior Member

Joined: 01/14/2015

View Profile


Offline
Posted: 10/15/20 11:21am Link  |  Quote  |  Print  |  Notify Moderator

I am doing the very thing the OP wants using a Trik-L-Start. Super easy installation and does the job perfectly.


Ed - on the Central Oregon coast
2018 Winnebago Fuse 23A
Scion xA toad

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 

Open Roads Forum  >  Tech Issues

 > Solar charge to chassis battery
Search:   Advanced Search

Search only in Tech Issues


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2021 CWI, Inc. © 2021 Good Sam Enterprises, LLC. All Rights Reserved.