Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > RV SYSTEMS AND TECHNOLOGIES FORUMS > RV Systems & Appliances
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 05-17-2013, 08:38 PM   #1
Registered User
 
Join Date: Mar 2007
Location: Somewhere I guess?
Posts: 453
Simple solar wiring questions

I bought a 30A solar charger (the same on HF sells for $80) though I paid $32 on ebay for it, new. This will be going on a 200W (2x 100W panel) system so it's plenty large enough for my needs.

Question 1: I see that charge controllers have an output hookup for lights or whatever... but as I understand it, you don't even HAVE to use that hookup. You can just hook your 12v up directly to the battery and have everything work properly, correct?

Reviews I read on the controller on HF's site says you can't put more than 15W on the controller's "load" or it'll blow the controller. Since everything is already set up to run off of the batteries, I may as well leave that be and run the controller's battery connection to the batteries and run loads from the batteries directly as was originally intended.

I know it won't give the benefit of over-discharge protection but I can monitor that myself just fine by wiring in a digital volt meter.

My Class B van already has a complete 12v system with a house fuse panel that comes off of the house batteries (and a huge positive cable going to the Onan AJ 2.7KW generator.. a charging cable for when the generator is in use?).

Question 2: I also have a good working RV converter for 12v power and battery charging while on the grid. Will I need to separate the solar controller from the battery when I have my RV converter running? I would assume the controller should be okay having a charging current on the battery connection poles, but you never know.

A simple toggle switch would do the trick, but I'd have to be sure I flip it, if that's required to keep from blowing the controller.
Cubey 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 05-18-2013, 07:45 AM   #2
Senior Member
 
Join Date: Nov 2007
Location: somewhere in the west
Posts: 1,168
#1 Right
#2 No

My thoughts . . . . I believe that controller, as I remember from others posts, is just about worthless as it is not a three stage controller, for what it's worth.

A GOOD three stage, MPPT, controller in a small size is really not that much money, and you batteries will thank you for it.

Ed
Ed-Sommers is offline   Reply With Quote
Old 05-18-2013, 09:14 AM   #3
Registered User
 
Join Date: Mar 2007
Location: Somewhere I guess?
Posts: 453
What's the diffference between what I bought and a MPPT controller?

For panels, I have my eye on USA made Renogy solar panels. They are $35 per panel higher than Korean made ones (which I have been told are the worst for quality) so maybe the Renogy ones will be higher quality.

Edit: I found this video (below) that seems to show that MPPT works better than PWM... .. No harm done, I'll just relist it on ebay since the seller does no returns, or keep it as an emergency spare if an MPPT one goes out on me while off the grid)

Cubey is offline   Reply With Quote
Old 05-18-2013, 12:04 PM   #4
Registered User
 
Join Date: Mar 2007
Location: Somewhere I guess?
Posts: 453
I think I am going to get a little fancy and install one of these between the panel and controller. I guess I could also install one between the battery and house fuse panel so I can see what kind of load I am pulling off of the batteries.

Digital LCD 60V 100A Balance Voltage Battery Power Analyzer Watt Meter Checker | eBay

The meter can be had for a few bucks less than that listing, but that listing shows it turned on.

(WindyNation on amazon wants $45 for the same thing.. and they are apparently selling for that.. LOL)
Cubey is offline   Reply With Quote
Old 05-18-2013, 05:57 PM   #5
Senior Member
 
jackfish's Avatar
 
Join Date: Jan 2013
Location: Rural Independence, OR
Posts: 951
Any meter without a shunt connection with not give an accurate reading of SOC.
jackfish is offline   Reply With Quote
Old 05-18-2013, 07:47 PM   #6
Registered User
 
Join Date: Mar 2007
Location: Somewhere I guess?
Posts: 453
Quote:
Originally Posted by jackfish View Post
Any meter without a shunt connection with not give an accurate reading of SOC.
Shunts are cheap and easy to add in. What's SOC stand for?
Cubey is offline   Reply With Quote
Old 05-18-2013, 08:27 PM   #7
Senior Member
 
Dunner's Avatar
 
Join Date: Jun 2011
Location: Phx, Arid~zona
Posts: 11,106
Battery State Of Charge.

https://www.google.com/search?client...iw=931&bih=548

A good read.

http://www.solar-electric.com/deep-c...ttery-faq.html



__________________
2004 32' National Sea Breeze 1311 Class A on a F-53 Chassis, CHF, TST TPMS, 5Star Tune.
If Dunner (RVM23) can't fix it, it ain't broke!
Cheap Handling Fix Poll. Click Here to vote?
Dunner is offline   Reply With Quote
Old 05-18-2013, 08:30 PM   #8
Registered User
 
Join Date: Mar 2007
Location: Somewhere I guess?
Posts: 453
Thanks. My batteries aren't the best.

One is a DieHard Group 27 I bought new in 2010 and barely ever used in the travel trailer I had. I pulled it (and the converter) before I sold it since I knew my van needed them.

The other is a cheap Wal-Mart (Group 24?) that was in the van when I got it, but a little bit newer.

I'll make due with them until they go bad.. then I may switch to Trojan 6V ones.
Cubey is offline   Reply With Quote
Old 05-18-2013, 10:29 PM   #9
Senior Member
 
Dunner's Avatar
 
Join Date: Jun 2011
Location: Phx, Arid~zona
Posts: 11,106
Or... get some from Sam's or Costco and save a few $s.



__________________
2004 32' National Sea Breeze 1311 Class A on a F-53 Chassis, CHF, TST TPMS, 5Star Tune.
If Dunner (RVM23) can't fix it, it ain't broke!
Cheap Handling Fix Poll. Click Here to vote?
Dunner is offline   Reply With Quote
Old 05-18-2013, 10:44 PM   #10
Registered User
 
Join Date: Mar 2007
Location: Somewhere I guess?
Posts: 453
They won't be as good as Trojans.
Cubey is offline   Reply With Quote
Reply

Tags
solar, wiring



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


» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 07:41 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.