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Equipment & Gear => Power Equipment & RV => Topic started by: Fastass350 on August 20, 2019, 05:01:44 PM


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Title: Solar battery charger for RV?
Post by: Fastass350 on August 20, 2019, 05:01:44 PM
Which solar panel do you all recommend for daily charging of your rv batteries? I have a big generator for powering micro and a/c and all that stuff, as well as a little 1000 for running just a battery charger, but I’m trying to eliminate the fuel use and running the little 1000 just to charge what the sun could be. So I’m looking for suggestions for what solar panel setup to go with.

Thanks
Title: Re: Solar battery charger for RV?
Post by: gasman on August 20, 2019, 05:43:15 PM
Tagging along......
Title: Re: Solar battery charger for RV?
Post by: trophyelk6x6 on August 20, 2019, 05:59:54 PM
You can find solar panels cheap on amazon or evil bay but remember.............you still need a tender/meter to make sure the solar charger doesn't keep charging your RV batteries.  They are cheap, plug into the RV solar panel plug.  I was going to plug my solar panel into the convenient RV plug mounted on the side of my new RV and I thought...hmmm how does it quit charging once those dual batteries are fully charged? So I call my RV dealer Apache in Poulsbo and they said i needed a tender or shut off which is NOT built into your RV solar battery plug ins. FYI.  I haven't bought one yet and I don't remember the actual name but just inquire with a good RV dealer and they will know what you are asking. 
Title: Re: Solar battery charger for RV?
Post by: Russ McDonald on August 20, 2019, 07:26:06 PM
Look at Harbor Freight they have a 100 watt suitcase type panel setup for $189 I believe.  Has a regulator with it.

Sent from my SM-N950U using Tapatalk

Title: Re: Solar battery charger for RV?
Post by: Hilltop123 on August 20, 2019, 08:08:23 PM
You can find solar panels cheap on amazon or evil bay but remember.............you still need a tender/meter to make sure the solar charger doesn't keep charging your RV batteries.  They are cheap, plug into the RV solar panel plug.  I was going to plug my solar panel into the convenient RV plug mounted on the side of my new RV and I thought...hmmm how does it quit charging once those dual batteries are fully charged? So I call my RV dealer Apache in Poulsbo and they said i needed a tender or shut off which is NOT built into your RV solar battery plug ins. FYI.  I haven't bought one yet and I don't remember the actual name but just inquire with a good RV dealer and they will know what you are asking. 
The electronic device your talking about, is called a charge controller.
Title: Re: Solar battery charger for RV?
Post by: Hilltop123 on August 20, 2019, 08:16:25 PM
Are you thinking of permanently mounting the panel to the roof of the RV?
Title: Re: Solar battery charger for RV?
Post by: MADMAX on August 20, 2019, 09:28:39 PM
I use the harbor freight 20 dollar solar charger daily on single battery
Easy and cheap
500 watt Honda for the dvd and tv or heater fan if needed
I can go off grid for a couple weeks easy
Title: Re: Solar battery charger for RV?
Post by: 724wd on August 21, 2019, 08:38:28 AM
I use a Coleman panel and controller I bought from Costco. Last I looked, they still have them. I don't take my generator anymore (I will when it gets cooler and need to run the furnace/fan at night).

https://www.costco.com/Coleman-100W-Solar-Panel-With-8.5-AMP-Charge-Controller-.product.100389117.html
Title: Re: Solar battery charger for RV?
Post by: Carl on August 21, 2019, 12:43:01 PM
I just looked at the Costco 100W Solar Panel that comes with the controller.  It's got a $40 instant rebate right now!  $119.99 after rebate.

Carl
Title: Re: Solar battery charger for RV?
Post by: Fastass350 on August 21, 2019, 04:27:49 PM
Just ordered two from Costco, now my dad will have one too. Thanks for the help all!
Title: Re: Solar battery charger for RV?
Post by: 92xj on August 22, 2019, 06:10:22 AM
I just ordered the coleman solar panel from Costco as well.
Can I butt splice this on the end of the wires and plug it directly into my TT and not go the alligator clip on battery route I was originally thinking about doing?
https://www.amazon.com/SolarAccs-Industrial-Circular-Connector-Suitcase/dp/B07V7SBY72/ref=asc_df_B07V7SBY72/?tag=hyprod-20&linkCode=df0&hvadid=366403781750&hvpos=1o2&hvnetw=g&hvrand=13786869388638883922&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9033824&hvtargid=pla-802232737172&psc=1&tag=&ref=&adgrpid=77662753153&hvpone=&hvptwo=&hvadid=366403781750&hvpos=1o2&hvnetw=g&hvrand=13786869388638883922&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9033824&hvtargid=pla-802232737172

(https://live.staticflickr.com/65535/48599464972_148e9e4393_b.jpg)
(https://live.staticflickr.com/65535/48599465297_3777b823e6_b.jpg)
Title: Re: Solar battery charger for RV?
Post by: BNAElkhntr on August 22, 2019, 07:14:11 AM
I've used the Harbor Freight Model 100 watt with charge controller Like Russ said 189 but watch the ads got mine for 149 works great for keeping batteries topped off while I leave RV between Seasons Even has enough power to allow me to leave Propane Fridge running to keep stuff good while gone
https://www.harborfreight.com/100-watt-solar-panel-kit-63585.html
Title: Re: Solar battery charger for RV?
Post by: Fastass350 on August 23, 2019, 09:19:02 PM
We picked up our trailer today, and it has the same plug that yours shows xj, I asked the kid at the parts counter to order me a plug to fit that to wire my Coleman to. Should be pretty easy.
Title: Re: Solar battery charger for RV?
Post by: Carl on August 24, 2019, 09:15:04 AM
Are you guys permanently mounting the solar panels on your RVs?  :dunno:
Title: Re: Solar battery charger for RV?
Post by: Russ McDonald on August 24, 2019, 09:58:26 AM
I have seen it done.   The problem with a permanent mount is you would have ri have your rig parked to hey good sun. Ther easy spat panels work if you get a shadow across the panel it will shut off those streams not giving you full efficiency of ther panel.   If the shadow falls jus right you can shut down the whole panel.  On the other side is if they are decent panels you will get  charge just off ambient light.  Ibuse solar for my remote repeater sites for work.  Full overcast I get anywhere from 1.5 to 2 amps from the panels.

Sent from my SM-N950U using Tapatalk

Title: Re: Solar battery charger for RV?
Post by: Ghost Hunter on August 24, 2019, 10:32:02 AM
Just ordered one for the cabin.   :tup:
Title: Re: Solar battery charger for RV?
Post by: 92xj on September 02, 2019, 02:47:12 PM
Got my panel in and was going to get it all set up.
Might seem like a dumb question, but which wire is the Positive on the panel, they are both black and I do not see a + or - on the black box...
(https://live.staticflickr.com/65535/48667818581_85bd3e14bd_b.jpg)
Title: Re: Solar battery charger for RV?
Post by: BNAElkhntr on September 02, 2019, 05:33:12 PM
What That Little tag on the one wire say? @92xj
Title: Re: Solar battery charger for RV?
Post by: 92xj on September 02, 2019, 06:58:28 PM
"Do not connect or disconnect under load"
Title: Re: Solar battery charger for RV?
Post by: Stein on September 02, 2019, 07:12:27 PM
The easy way is to put it in the sun and use a multi meter.  Another way is to open up the junction box.  Almost every module will have a diode (actually two) that is used to help keep power output up when the module is partially shaded.  The diode will have a stripe on one side and that stripe will be on the side that is positive - one lead will be connected to that.  Both diodes "point" in the same direction to the positive lead.
Title: Re: Solar battery charger for RV?
Post by: 92xj on September 02, 2019, 07:19:52 PM
No multi meter at the moment...
(https://live.staticflickr.com/65535/48668998906_9d7bb73a31_b.jpg)
Title: Re: Solar battery charger for RV?
Post by: 92xj on September 03, 2019, 07:59:06 AM
every picture I have found including the factory pictures as well as other people posting up there project show the red wire on the right, as the positive.  They must have run out of red when building my unit.  So, I think I am going to assume the right is positive and hope for the best.  What will happen if I assume incorrectly?

PS- I still hate electrical stuff!
Title: Re: Solar battery charger for RV?
Post by: 92xj on September 04, 2019, 06:01:04 AM
@Stein
Title: Re: Solar battery charger for RV?
Post by: mnb300 on September 04, 2019, 07:02:05 AM
the cable to the right is the +. just like Stein said those 2 diodes stripe side connected to the +.
Title: Re: Solar battery charger for RV?
Post by: 92xj on September 04, 2019, 07:10:50 AM
Thanks!

Now, help me learn a little please.  I see no difference in the left and the right, the diodes look connected to the right and the left.
Title: Re: Solar battery charger for RV?
Post by: Stein on September 04, 2019, 07:14:19 AM
Yep, right cable is +.
Title: Re: Solar battery charger for RV?
Post by: mnb300 on September 04, 2019, 07:40:09 AM
https://www.altestore.com/blog/2017/07/solar-panels-plus-minus-terminals/#.XW_LcyhKg2w
Title: Re: Solar battery charger for RV?
Post by: 92xj on September 04, 2019, 07:53:14 AM
Thanks for the link and help @mnb300 and @stein.
Learn something new everyday.
Title: Re: Solar battery charger for RV?
Post by: ctwiggs1 on September 04, 2019, 08:33:30 AM
Jumping in to thread steal a little here...

If a fella wanted to put some panels up top for some boondocking and didn't have a "solar panel" power port on his RV, could he just rig them up to the main power plug?  I've got a 30A plug for "shore power" (I hate using that term for RV), would I just rig it to that?
Title: Re: Solar battery charger for RV?
Post by: ctwiggs1 on September 04, 2019, 08:36:03 AM
Jumping in to thread steal a little here...

If a fella wanted to put some panels up top for some boondocking and didn't have a "solar panel" power port on his RV, could he just rig them up to the main power plug?  I've got a 30A plug for "shore power" (I hate using that term for RV), would I just rig it to that?

Just realized... I'd need an inverter for that.
Title: Re: Solar battery charger for RV?
Post by: 92xj on September 04, 2019, 08:51:08 AM
I'd just run a plug in the wires at the panels themselves and go straight to the battery.

Panel on top.
Wire out of panel, female plug.
Male plug to 10' of wire (depending on battery and panel location)
end of 10' wire into charge controller
wire out of charge controller into a male plug
female plug hard wired onto batteries.
When driving down the road, panel is hard mounted and all your wires are unplugged and stored inside the trailer.

This is how I am setting mine up, minus a hard mount to the roof.  I'm going to run this coleman panel on the ground propped up for a while and see how it does.  If I want to upgrade later, I will buy a nicer bigger panel and hard mount to roof.
Title: Re: Solar battery charger for RV?
Post by: Ghost Hunter on September 13, 2019, 03:28:43 PM
Got mine mounted yesterday.  Only gets partial sun due to large trees on south exposure.  No problem charging my battery.   :tup:
Title: Re: Solar battery charger for RV?
Post by: Fastass350 on September 14, 2019, 03:01:45 PM
Been using mine at camp and it’s working great, same deal though only sun in the afternoon but it’s keeping up. Ordered two, one for my folks, one came broken and with no controller so I’m waiting for the new one. I just hard wired the controller of mine to the battery and out quick disconnects off the panel.
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