Reply
 
Thread Tools Display Modes
Old 12-02-2015, 09:52 AM   #21
Senior Member
 
Toothpick's Avatar
 
Join Date: Sep 2015
Location: Statesboro, GA
Posts: 276
Never mind I think I found the answer to my question... If I use 4 100 watt panels looks like I'll need at least a 40 amp controller....
__________________

__________________
2016 FR Vengeance 25V Toy Hauler
2015 Ram 2500HD CC 4x4 6.7L Cummins
2017 Indian Chieftain Darkhorse
2017 Indian Scout
Toothpick is offline   Reply With Quote
Old 12-02-2015, 09:56 AM   #22
Senior Member
 
Join Date: Aug 2015
Location: Stafford, VA
Posts: 277
Quote:
Originally Posted by mele View Post
Ok.... Now if I want to upgrade will a 20 amp mppt controller be large enough for 4 100 watt panels in a series-parallel?

NO
12v 100W = 8.33333 amps x4 33.3333 amps
thats best case, you will get less but you need at least a 30 amp controller
__________________

__________________
2015 grey wolf 27RR
2015 Chevy 3500HD
kcmusa is offline   Reply With Quote
Old 12-02-2015, 01:14 PM   #23
Senior Member
 
Join Date: Apr 2012
Posts: 3,155
Before planning anything regarding solar charging, the first thing to do is to determine how many watts are going to be used and thus how many has to be put back into the batteries. To be talking 100W... 200W... 400W panels first is backward thinking.

First thing is to get and install is a Trimetric battery monitor. Get those numbers and plan properly.

I would suggest getting informed and this is an excellent source for information. WW

https://handybobsolar.wordpress.com/...ging-puzzle-2/
__________________
WolfWhistle is offline   Reply With Quote
Old 12-04-2015, 10:45 AM   #24
Senior Member
 
Toothpick's Avatar
 
Join Date: Sep 2015
Location: Statesboro, GA
Posts: 276
Quote:
Originally Posted by WolfWhistle View Post
Before planning anything regarding solar charging, the first thing to do is to determine how many watts are going to be used and thus how many has to be put back into the batteries. To be talking 100W... 200W... 400W panels first is backward thinking.

First thing is to get and install is a Trimetric battery monitor. Get those numbers and plan properly.

I would suggest getting informed and this is an excellent source for information. WW

https://handybobsolar.wordpress.com/...ging-puzzle-2/
Thanks, I know.

I'm just thinking out loud on the forum about upgrading later. IF I decide to go from just a battery maintenance setup to full off the grid for my TH.

Mel
__________________
2016 FR Vengeance 25V Toy Hauler
2015 Ram 2500HD CC 4x4 6.7L Cummins
2017 Indian Chieftain Darkhorse
2017 Indian Scout
Toothpick is offline   Reply With Quote
Old 12-05-2015, 02:41 PM   #25
Senior Member
 
Toothpick's Avatar
 
Join Date: Sep 2015
Location: Statesboro, GA
Posts: 276
Starter Kit came in today. Now to got hook it up!
__________________
2016 FR Vengeance 25V Toy Hauler
2015 Ram 2500HD CC 4x4 6.7L Cummins
2017 Indian Chieftain Darkhorse
2017 Indian Scout
Toothpick is offline   Reply With Quote
Old 12-06-2015, 06:59 PM   #26
Senior Member
 
Toothpick's Avatar
 
Join Date: Sep 2015
Location: Statesboro, GA
Posts: 276
OK.

My test results from today. Tested with a hand held voltage meter.
My TH is currently on the north side of a strip of Live Oak Trees.

I got from 12.2 to 12.4 volts in direct diffused sunlight (real bright overcast/high clouds) or diffused shade (no real dark shadows sun broken up by high near leafless trees).

I got 12.5 - 12.6 volts sitting on the tailgate of my truck (white) in same general area. So reflected bright light seemed to increase voltage a little. Maybe the white roof on TH will help?

Think I'm going to order a 30A Mppt Controller and two more panels.
If I install them in Series and get near 36V I should have enough juice to keep two group 24 batteries up during the week and run lights, TV and heater on the weekend...

Thanks for everyone's input.

Mel
__________________
2016 FR Vengeance 25V Toy Hauler
2015 Ram 2500HD CC 4x4 6.7L Cummins
2017 Indian Chieftain Darkhorse
2017 Indian Scout
Toothpick is offline   Reply With Quote
Old 12-07-2015, 05:01 PM   #27
Senior Member
 
Join Date: Apr 2012
Posts: 3,155
Quote:
Originally Posted by mele View Post
OK.

My test results from today. Tested with a hand held voltage meter.
My TH is currently on the north side of a strip of Live Oak Trees.

I got from 12.2 to 12.4 volts in direct diffused sunlight (real bright overcast/high clouds) or diffused shade (no real dark shadows sun broken up by high near leafless trees).

I got 12.5 - 12.6 volts sitting on the tailgate of my truck (white) in same general area. So reflected bright light seemed to increase voltage a little. Maybe the white roof on TH will help?

Think I'm going to order a 30A Mppt Controller and two more panels.
If I install them in Series and get near 36V I should have enough juice to keep two group 24 batteries up during the week and run lights, TV and heater on the weekend...

Thanks for everyone's input.

Mel
12 volt panels go in parallel to match the 12 volt charger controller and batteries you have. Not sure how you are measuring them, but if properly tilted they should give you more on a sunny day. Like I said way back, you cannot have any shadow fall on a panel or it will basically give you nothing. You need to study more on solar but in the meantime don't connect panels in series. WW
WW
__________________
WolfWhistle is offline   Reply With Quote
Old 12-07-2015, 05:44 PM   #28
Senior Member
 
Join Date: Mar 2014
Location: Mountain Foothills of Southern Alberta
Posts: 798
If you are getting an MPPT controller you can connect the panels in series up to the maximum input voltage of the controller.
The one adavantage to connecting in parallel is if a panel is in shade it will not bring down the voltage as much compared to being connected in series.
__________________

2007 Surveyor SV230
- 200 Watts Solar/MPPT Controller - 230 AH Battery Bank - 600 watt PSW Inverter - (2) 2000 watt Inverter Generators - LED Lighting - Boon Docking 99% of the time.
2009 F150 - 5.4 Litre - Tow Package
boondocking is online now   Reply With Quote
Old 12-07-2015, 10:50 PM   #29
Senior Member
 
Join Date: Apr 2012
Posts: 3,155
The combined battery voltage has to be up as well ... not to mention appliances, pumps, lights etc etc. The higher DC voltage setups are for other than RVs. IMO
WW
__________________
WolfWhistle is offline   Reply With Quote
Old 12-07-2015, 10:54 PM   #30
Senior Member
 
Join Date: Apr 2012
Posts: 3,155
I wouldn't waste my money on an MPPT controller... for an RV
__________________

__________________
WolfWhistle is offline   Reply With Quote
Reply

Tags
solar

Thread Tools
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



» Virginia Campgrounds

Reviews provided by




ForestRiverForums.com is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 03:34 PM.