RV Trip Planning Discussions

Go Back   iRV2 Forums > RV SYSTEMS AND TECHNOLOGIES FORUMS > Going Green
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
 
Thread Tools Search this Thread Display Modes
 
Old 12-24-2019, 03:06 PM   #1
Senior Member
 
Unicorn Driver's Avatar
 
Join Date: Jan 2017
Posts: 6,075
Max watts of panels for 20 amp MPPT controller

Hi,

I have a 20 amp MPPT charge controller for use with with 200w of mono panels

Is it possible to up this to 300watts?

I ask is I am getting conflicting info online if can do this, some sites say its 100w per 10amp of charge controller.


Thanks,
__________________

__________________
2008 Itasca Latitude 37g UFO Gas pusher.
2012 Jeep Wrangler Sahara JKU.
Unicorn Driver is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 12-24-2019, 03:21 PM   #2
Senior Member
 
Join Date: Jun 2004
Posts: 1,105
Quote:
Originally Posted by Unicorn Driver View Post
Hi,

I have a 20 amp MPPT charge controller for use with with 200w of mono panels

Is it possible to up this to 300watts?

I ask is I am getting conflicting info online if can do this, some sites say its 100w per 10amp of charge controller.


Thanks,
30 amp controller is generally good for 400 - 440 watts. I would think 300 watts would be fine on a 20 amp controller.
__________________

__________________
2014 Southwind 32VS
2013 Nissan Xterra PRO-4X
PbdBlue is offline   Reply With Quote
Old 12-24-2019, 03:31 PM   #3
Senior Member
 
Unicorn Driver's Avatar
 
Join Date: Jan 2017
Posts: 6,075
Quote:
Originally Posted by PbdBlue View Post
30 amp controller is generally good for 400 - 440 watts. I would think 300 watts would be fine on a 20 amp controller.
Thanks PDBlue,

I would be happy with 300w but 400w would be even better.
__________________
2008 Itasca Latitude 37g UFO Gas pusher.
2012 Jeep Wrangler Sahara JKU.
Unicorn Driver is offline   Reply With Quote
Old 12-24-2019, 04:16 PM   #4
Senior Member
 
Join Date: Jun 2004
Posts: 1,105
Quote:
Originally Posted by Unicorn Driver View Post
Thanks PDBlue,

I would be happy with 300w but 400w would be even better.
You may max out at 20 amps in which case most controllers will just limit the output at 20. I doubt that will happen. 300 watts at 13.6 volts is 22 amps and you'll likely never get that. Usually more like 70% (240 watts) at best is what you can expect.
__________________
2014 Southwind 32VS
2013 Nissan Xterra PRO-4X
PbdBlue is offline   Reply With Quote
Old 12-24-2019, 04:39 PM   #5
Senior Member
 
Unicorn Driver's Avatar
 
Join Date: Jan 2017
Posts: 6,075
Quote:
Originally Posted by PbdBlue View Post
You may max out at 20 amps in which case most controllers will just limit the output at 20. I doubt that will happen. 300 watts at 13.6 volts is 22 amps and you'll likely never get that. Usually more like 70% (240 watts) at best is what you can expect.
Thanks PDBlue,

I hear you on not getting full output.
__________________
2008 Itasca Latitude 37g UFO Gas pusher.
2012 Jeep Wrangler Sahara JKU.
Unicorn Driver is offline   Reply With Quote
Old 12-24-2019, 07:54 PM   #6
Senior Member
 
Unicorn Driver's Avatar
 
Join Date: Jan 2017
Posts: 6,075
The online fuses on my cables are 15 amp so would need to replace them also.
__________________
2008 Itasca Latitude 37g UFO Gas pusher.
2012 Jeep Wrangler Sahara JKU.
Unicorn Driver is offline   Reply With Quote
Old 12-25-2019, 01:08 AM   #7
Senior Member
 
vsheetz's Avatar


 
Fleetwood Owners Club
Ford Super Duty Owner
Join Date: Jun 2012
Location: SoCal
Posts: 14,609
Flat mounting will reduce about 15% from rated production. Find out what happens if the controller rating is exceeded (often voltage can't be exceeded, but current can). Then you can figure the panel wattage oversubsciption can be.
__________________
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
vsheetz is offline   Reply With Quote
Old 12-25-2019, 05:40 AM   #8
Senior Member
 
Unicorn Driver's Avatar
 
Join Date: Jan 2017
Posts: 6,075
Quote:
Originally Posted by vsheetz View Post
Flat mounting will reduce about 15% from rated production. Find out what happens if the controller rating is exceeded (often voltage can't be exceeded, but current can). Then you can figure the panel wattage oversubsciption can be.
Thanks Vince

I am going to give Renogy a call after the holidays and figure it out.
__________________
2008 Itasca Latitude 37g UFO Gas pusher.
2012 Jeep Wrangler Sahara JKU.
Unicorn Driver is offline   Reply With Quote
Old 12-25-2019, 09:11 AM   #9
Senior Member
 
Join Date: Jun 2004
Posts: 1,105
Quote:
Originally Posted by Unicorn Driver View Post
Thanks Vince

I am going to give Renogy a call after the holidays and figure it out.
I have two Renogy 100 watt mono panels set up as portable feeding a Victron MPPT 15 amp controller. Max I see is usually in the low teens. 3 panels are not going to exceed the controller rating. What controller are you going to use?
__________________
2014 Southwind 32VS
2013 Nissan Xterra PRO-4X
PbdBlue is offline   Reply With Quote
Old 12-25-2019, 09:16 AM   #10
Senior Member
 
Unicorn Driver's Avatar
 
Join Date: Jan 2017
Posts: 6,075
Hi Pdblue,

It's the Renogy 20 amp LI MPPT I have.

Cheers,
__________________
2008 Itasca Latitude 37g UFO Gas pusher.
2012 Jeep Wrangler Sahara JKU.
Unicorn Driver is offline   Reply With Quote
Old 12-25-2019, 10:40 AM   #11
Senior Member
 
Unicorn Driver's Avatar
 
Join Date: Jan 2017
Posts: 6,075
Quote:
Originally Posted by PbdBlue View Post
I have two Renogy 100 watt mono panels set up as portable feeding a Victron MPPT 15 amp controller. Max I see is usually in the low teens. 3 panels are not going to exceed the controller rating. What controller are you going to use?
Hi Pdblue,

You don't have any roof mount panels? If not are you happy with the 200w of the portable?
__________________
2008 Itasca Latitude 37g UFO Gas pusher.
2012 Jeep Wrangler Sahara JKU.
Unicorn Driver is offline   Reply With Quote
Old 12-25-2019, 04:40 PM   #12
Registered User
 
Join Date: May 2019
Posts: 119
Quote:
Originally Posted by Unicorn Driver View Post
Thanks Vince

I am going to give Renogy a call after the holidays and figure it out.
Why do that? If you know what you model got, just get your info online. Good Luck
https://www.renogy.com/products/charge-controllers/
TajMahal is offline   Reply With Quote
Old 12-25-2019, 04:45 PM   #13
Senior Member
 
Join Date: Jun 2004
Posts: 1,105
Quote:
Originally Posted by Unicorn Driver View Post
Hi Pdblue,

You don't have any roof mount panels? If not are you happy with the 200w of the portable?
We have 650 watts on the roof. The 200 watts portable is for when we're parked in the trees. Two BB LiFePo4's. We typically use about 100 ah\day. Rooftop solar will top that off pretty quickly. With the portable we need to be a bit more frugal.
__________________
2014 Southwind 32VS
2013 Nissan Xterra PRO-4X
PbdBlue is offline   Reply With Quote
Old 12-25-2019, 08:32 PM   #14
Senior Member
 
Unicorn Driver's Avatar
 
Join Date: Jan 2017
Posts: 6,075
Quote:
Originally Posted by PbdBlue View Post
We have 650 watts on the roof. The 200 watts portable is for when we're parked in the trees. Two BB LiFePo4's. We typically use about 100 ah\day. Rooftop solar will top that off pretty quickly. With the portable we need to be a bit more frugal.
Thanks Pdblue,
__________________

__________________
2008 Itasca Latitude 37g UFO Gas pusher.
2012 Jeep Wrangler Sahara JKU.
Unicorn Driver is offline   Reply With Quote
Reply

Tags
panel



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
MPPT vs PWM Charge Controller for 12 volt portable panels Unicorn Driver Going Green 18 10-12-2019 08:59 PM
Schneider MPPT 60 150 Controller Full Time Mel Going Green 8 12-23-2017 04:56 PM
Change PWM to MPPT Controller later? brucemcdou Going Green 23 04-04-2017 05:44 PM
MPPT charge controller question SteveUpp Going Green 1 09-27-2014 07:49 AM
MPPT Charge controller Sandwagon RV Systems & Appliances 11 08-30-2013 11:25 AM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 12:06 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
×