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 > MOC Technical Forums > Solar, Charging Systems, Batteries and Electrical
Click Here to Login

Reply
 
Thread Tools Search this Thread Display Modes
 
Old 06-12-2024, 05:01 PM   #1
JeffBussman
New Member
 
Join Date: Sep 2023
Location: Bakersfield
Posts: 8
M.O.C. #33336
External solar panels question

2024 Montana with 400i solar flex with two dragonfly 100-amp hour lithium batteries. 2000 W inverter Victron 100/30 smart charge controller.

I want to add two Harbor freight 100-watt external panels. Box info(31amp hours/ 500w per day. Rated output 18 VDC/100w/5.56a)

Do I hook them up in series or parallel? I bought a Victron 75/15 smart charge controller for those panels and was going to wire directly to the battery.
 
JeffBussman is offline   Reply With Quote
Old 06-12-2024, 05:11 PM   #2
Hblick48
Montana Master
 
Join Date: Jun 2018
Location: Folsom, California
Posts: 560
M.O.C. #21903
Parallel
__________________
'05 F250 6.0 Bullet Proofed - Sold
'17 F350 6.7 Lariet
'02 Montana 3280RL Upgraded a bunch.
Hblick48 is offline   Reply With Quote
Old 06-12-2024, 05:13 PM   #3
Foldbak
Montana Master
 
Foldbak's Avatar
 
Join Date: Jan 2022
Location: Shingle Springs
Posts: 2,462
M.O.C. #30417
Quote:
Originally Posted by JeffBussman View Post
2024 Montana with 400i solar flex with two dragonfly 100-amp hour lithium batteries. 2000 W inverter Victron 100/30 smart charge controller.

I want to add two Harbor freight 100-watt external panels. Box info(31amp hours/ 500w per day. Rated output 18 VDC/100w/5.56a)

Do I hook them up in series or parallel? I bought a Victron 75/15 smart charge controller for those panels and was going to wire directly to the battery.
Are you mounting them to the roof? You're pre-wired with connections for 2 more panels. There are wires in the battery bay where you would install the controller and connect the panels. Then the additional controller charge output goes to the giggy box. Parallel connection.
Attached Thumbnails
Click image for larger version

Name:	20231217_1446371.jpg
Views:	18
Size:	136.7 KB
ID:	17312   Click image for larger version

Name:	Wirng Diagram.png
Views:	23
Size:	236.2 KB
ID:	17313  
__________________
Tony & Donna & the best dog ever, Murphy.
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
Foldbak is offline   Reply With Quote
Old 06-12-2024, 05:57 PM   #4
JeffBussman
New Member
 
Join Date: Sep 2023
Location: Bakersfield
Posts: 8
M.O.C. #33336
Thank you. I’m going to use them on the ground. Eventually, we will probably add some higher powered solar panels to the roof along with another battery or two.
JeffBussman is offline   Reply With Quote
Old 06-12-2024, 07:39 PM   #5
Foldbak
Montana Master
 
Foldbak's Avatar
 
Join Date: Jan 2022
Location: Shingle Springs
Posts: 2,462
M.O.C. #30417
Quote:
Originally Posted by JeffBussman View Post
Thank you. Iím going to use them on the ground. Eventually, we will probably add some higher powered solar panels to the roof along with another battery or two.
Plug them into the solar port in the wet bay.
__________________
Tony & Donna & the best dog ever, Murphy.
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
Foldbak is offline   Reply With Quote
Old 06-13-2024, 06:28 AM   #6
Daryles
Montana Master
 
Daryles's Avatar
 
Join Date: May 2019
Location: Alton
Posts: 2,845
M.O.C. #24086
Try them in series or parallel. See what gives you better performance.
I had my roof panels originally in parallel. Then I tried them in series.
I get better performance in series. This is due to the output voltage of the panels combine for a higher voltage sooner in the morning when the sun comes up and later in the evening before sunset.
__________________
Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
Daryles is offline   Reply With Quote
Old 06-13-2024, 09:54 AM   #7
JeffBussman
New Member
 
Join Date: Sep 2023
Location: Bakersfield
Posts: 8
M.O.C. #33336
I will try switching the existing panels. I'm not sure if they are in series or parallel right now. I will get on the roof and look.
We have a two-week dry camping trip with a full-size 12v fridge and are trying to Minimize the generator use needed.
JeffBussman is offline   Reply With Quote
Old 06-13-2024, 12:08 PM   #8
Foldbak
Montana Master
 
Foldbak's Avatar
 
Join Date: Jan 2022
Location: Shingle Springs
Posts: 2,462
M.O.C. #30417
Quote:
Originally Posted by JeffBussman View Post
I will try switching the existing panels. I'm not sure if they are in series or parallel right now. I will get on the roof and look.
We have a two-week dry camping trip with a full-size 12v fridge and are trying to Minimize the generator use needed.
Your factory panels are in parallel connected to MC4 ports. Might be a challenge to change to series.
Attached Thumbnails
Click image for larger version

Name:	Solar connect.jpg
Views:	10
Size:	177.1 KB
ID:	17321  
__________________
Tony & Donna & the best dog ever, Murphy.
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
Foldbak is offline   Reply With Quote
Reply

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

» Featured Campgrounds

Reviews provided by

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 04:43 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2024, vBulletin Solutions, Inc.