Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
 

Go Back   Montana Owners Club - Keystone Montana 5th Wheel Forum > GENERAL DISCUSSIONS > General Discussions about our Montanas
Click Here to Login

Reply
 
Thread Tools Search this Thread Display Modes
 
Old 09-16-2020, 10:30 AM   #1
Sharko
Established Member
 
Join Date: Jun 2020
Location: Parker
Posts: 30
M.O.C. #26528
Solar Trickle charging

Sorry not sure where to ask. Have 2020 3930FB.
I'm wondering if there is any documentation on how many watts of solar is needed to trickle charge batteries. I have 2 - 6V 225 amp hour interstate deep cycle batteries, controller is 100W. Partly the reason I ask is I ALSO have a CalAmp GPS (for theft) unit that I would like to leave powered during winter storage months. I live in CO so mostly sunny. I currently have a 240W solar panel but NEVER, even on hot days, have i seen over 180 watts generated. Usually around 80-120W which concerns me as well.
 
Sharko is offline   Reply With Quote
Old 09-16-2020, 12:43 PM   #2
Daryles
Montana Master
 
Daryles's Avatar
 
Join Date: May 2019
Location: Alton
Posts: 1,984
M.O.C. #24086
First you have to do an energy audit. You need to know what is drawing power and how much. You mentioned a tracking device, you also have parasitic draws, radio, CO, smoke, propane detector. Some of these are hard wired in. No fuse. You said you have a 100W controller and 240W panel. Is that correct? If so you may want to upgrade that.
If you dont have a battery monitor, that would be a good investment too. You will be able to monitor that state of charge on your batteries. I have a Victron BMV-712 bluetooth monitor. I can keep an eye on the batteries from the house 100' away. Could be handy for you if your RV is in storage. Pull up out front and check the batteries without leaving your car. Victron also makes a Bluetooth MPPT controller that you can also monitor remotely. I have a Victron Smart Solar 100/30 MPPT controller. I should have got the 100/50 model.
__________________
Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
Daryles is offline   Reply With Quote
Old 09-16-2020, 12:56 PM   #3
AZ Traveler
Site Team
 
AZ Traveler's Avatar
 
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,385
M.O.C. #20477
Sharko,

You need to let us know how you use your rig to help with your answer.

If you primarily use campgrounds with shore power and are only worried about keeping your batteries charged in storage your current set up should be plenty unless your GPS draws a lot. Normally you would want to totally disconnect your batteries in storage but if the GPS is a priority you will want to keep it connected.

If you are considering boondocking with solar as your primary power source you need to do more homework to determine your needs.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL

"Life is too short to stay indoors, enjoy the ride!"
AZ Traveler is offline   Reply With Quote
Old 09-16-2020, 12:56 PM   #4
BiggarView
Montana Master
 
Join Date: Jan 2017
Location: Crest Hill
Posts: 506
M.O.C. #19382
Send a message via AIM to BiggarView
Agree with the audit. if you are using 30 amps(as an example) per day, you have 3.75 days of battery power to draw on (225ah*50%usable/30amps=3.75 days.). if you figure that the solar is giving you 80-120 watts and we use the nominal 5 hours per day of usable sun... you are still looking at 40ish amps replaced by the solar every day. methinks you have plenty for the job if that is all you are running. Do the audit. Extra solar would not hurt, extra pair of 225AH batteries would provide more peace of mind too... but... you gotta run the numbers.
__________________

2017 RAM 3500 Laramie CCLB Dually CTD Aisin, OEM auto level rear air-ride, B&W hitch
2020 3813MS Legacy Cobalt FBP, MORryde 8K IS & pinbox, PI EMS,DIY mods by in-house "craftsman", RV security system Mk1 Beagle Alerter
BiggarView is offline   Reply With Quote
Reply

Tags
batteries, gps, solar

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
Forum Jump

Powered by vBadvanced CMPS v3.2.3
Disclaimer:

This website is not affiliated with or endorsed by Montana RV, Keystone RV Company or any of its affiliates. This is an independent, unofficial site.


All times are GMT -6. The time now is 07:21 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2022, vBulletin Solutions, Inc.