A battery question about my new Little Guy....

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A battery question about my new Little Guy....

Postby lgna70 » Thu Aug 19, 2010 4:59 pm

Ok, I've read a ton of posts about battery usage etc in this forum, but I've gotta be honest here, I dont really understand most of what everyone is talking about! I have zero technical knowledge when it comes to, well, technical things...but am always willing to learn!
We've had our Little Guy for two weeks now and noticed that on our second outing the fan and lights were dim in the morning after leaving the fan on all night. The week prior ( when we picked it up brand new and used it that weekend ) it had tons of power ( battery life ). Now this is where I am confused: When we bought it, we were told it would charge the battery while we drove...but this doesnt seem to be the case. We had to get a converter from a 4prong to 7 which the dealer hooked up for us. Our tail lights, blinkers etc work fine. I havent even seen the battery yet but am wondering if we will need to buy a charger for the times we let it sit between outings? I know I sound like such a newbie its not even funny, but any info would be appreciated. I've put in call to the RV dealer too but have yet to hear back from them.
Thanks ahead of time! :)
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Postby Dale M. » Thu Aug 19, 2010 9:06 pm

Any 4 prong plug will NOT have provisions for battery charging from TV (tow vehicle) ....

You need at least one additional wire from TV's electrical system to TD for battery charging circuit (5 wire (pin) connector)... Usually most people go the tradition RV style 7 pin connector... Usually same style provided by factory on most pickup trucks and large vehicles....

IF you do not have abilities to do this wiring, go to the dealer that sold you trailer and have them upgrade the TV/TD wiring....

IF that dealer supposedly converted TV/TD for 7 pin plug so it would charge battery, it may not be working.... Have it checked out to see if its operating properly....

Also consider battery's have limited charge life.... How many hours have you used battery power with out a charge..... IF you plug in connector and run car for a little time does battery in TD charge?..

Also consider if you have access to commercial power (shore power) a simple off the shelf battery charger will suffice to keep battery up.... And yes there are more exotic solutions... from shore power to small portable generators if shore power is not available...

Lots of reading in this forum that is very enlightening....

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Last edited by Dale M. on Thu Aug 19, 2010 9:24 pm, edited 1 time in total.
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Postby Ratkity » Thu Aug 19, 2010 9:17 pm

Right now, I'm keeping my Little Guy plugged in at home so the battery keeps topped off. I'm running the long plug into the basement window and have a converter from 30amp to 15amp plug and use a heavy duty extension cord to a dedicated outlet.

I also have a 4 to 7 prong connector on the Rav4 and it does NOT charge while driving. The converter in the Little Guys that have them installed will float the battery nicely when plugged into shore power. I eventually want a solar battery floater (maintainer) because I've read here that batteries lose their charge by just sitting around and I really don't want to keep the TD plugged in all the time thru the basement window. My plan is to plug the TD overnight through the basement window so it gets a full charge after a weekend use and then put the solar float charger on it until the next time camping without shore power in Shenandoah NP.

Hugs,
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Postby Dale M. » Thu Aug 19, 2010 9:30 pm

Sounds like "shore power" situation is ok....

Sounds like RAV 4 is not wired for battery charging when connected (4 pin to 7 pin adapter).... As mentioned above you need at least one additional wire from RAV 4 battery through a relay and a fuse back to connector at hitch and on to TD battery for charging "on the road" or at a location where the is no shore power......

IF TV is wired correctly you can charge battery in TD every few days by just connecting up TV with TD and letting TV run for a time to charge TD battery....

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Postby wannabefree » Thu Aug 19, 2010 10:18 pm

Another post said LG is now using a 35Ah AGM battery. If you run a Fantastic fan all night on low (about 1.8A) you'll pretty much deplete that battery, so it's no surprise your lights dim.

I have a real Rube Goldberg setup for TV charging you might try. Get a cheap inverter rated 100-200W. Plug it into your cig lighter and run an extension cord out the window from it to the trailer shore power inlet. A little duct tape keeps the cord from dragging on the ground as you tool down the highway :)

Remember to unplug it when you stop, or bring jumper cables :lol:
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Postby Ratkity » Fri Aug 20, 2010 8:16 am

wannabefree wrote:Another post said LG is now using a 35Ah AGM battery. If you run a Fantastic fan all night on low (about 1.8A) you'll pretty much deplete that battery, so it's no surprise your lights dim.

I have a real Rube Goldberg setup for TV charging you might try. Get a cheap inverter rated 100-200W. Plug it into your cig lighter and run an extension cord out the window from it to the trailer shore power inlet. A little duct tape keeps the cord from dragging on the ground as you tool down the highway :)

Remember to unplug it when you stop, or bring jumper cables :lol:


Now that's an interesting way to do it! I have a cig lighter connector in the back of the Rav4. It shuts off when the TV is shut off.

Hugs,
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Postby Alphacarina » Fri Aug 20, 2010 7:20 pm

Dale M. wrote:Sounds like RAV 4 is not wired for battery charging when connected (4 pin to 7 pin adapter)

I'd bet money that's the case

Setting up a TV to charge the RV battery isn't a simple thing to do. My Little Guy has a Fantastic fan and I use a 15 watt solar panel on top of the trailer to keep things topped off . . . . but that wouldn't be enough if you were camped under the trees. We also use a EU2000i Honda Genset to charge batteries . . . . and more importantly, run the A/C

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Re: A battery question about my new Little Guy....

Postby JessInSeattle » Sun Aug 22, 2010 5:40 pm

Since I share the Little Guy with lgna70, I thought I'd pop in and say that I actually didn't get a 4 pole to 7 pole conversion on my car (a '99 RX300) but had them install a 7 pole stand alone with a relay switch on it so that it won't draw from my car battery when the LG isn't plugged into the hitch.

My concern at this point is what I've read about the new dry cell batteries that the LG makers have started using not lasting as long as the on board deep cell batteries they used to use (prior to 2011 models it appears).

Does anyone know how long the dry cell battery should hold its charge if we are using an outlet to plug in an electric pan in the galley, charging a cell phone or turning on lights for a hour or so and then running the fantastic fan on low or medium speed?

We chose the LG with the battery package thinking we'd have at least 2, possibly 3 days use out of it without having to hook it back up to my car or use shore power but as lgna70 noted, it was charged while driving for about 3 hours, ran for about a day and a half, was stored for a week, charged again while driving another 3 hours and then only ran for a day.

There is a possibility that the connection was giggled loose while we were driving and it did not charge on that second trip.

Is this what we should expect or do we need to have it checked out or purchase a deep cell battery for the tongue. And if that is the answer, can we daisy chain the deep cell to the dry cell safely?

Thanks for any insight!
J

lgna70 wrote:Ok, I've read a ton of posts about battery usage etc in this forum, but I've gotta be honest here, I dont really understand most of what everyone is talking about! I have zero technical knowledge when it comes to, well, technical things...but am always willing to learn!
We've had our Little Guy for two weeks now and noticed that on our second outing the fan and lights were dim in the morning after leaving the fan on all night. The week prior ( when we picked it up brand new and used it that weekend ) it had tons of power ( battery life ). Now this is where I am confused: When we bought it, we were told it would charge the battery while we drove...but this doesnt seem to be the case. We had to get a converter from a 4prong to 7 which the dealer hooked up for us. Our tail lights, blinkers etc work fine. I havent even seen the battery yet but am wondering if we will need to buy a charger for the times we let it sit between outings? I know I sound like such a newbie its not even funny, but any info would be appreciated. I've put in call to the RV dealer too but have yet to hear back from them.
Thanks ahead of time! :)
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Postby aggie79 » Thu Aug 26, 2010 1:36 pm

wannabefree wrote:Another post said LG is now using a 35Ah AGM battery. If you run a Fantastic fan all night on low (about 1.8A) you'll pretty much deplete that battery, so it's no surprise your lights dim.

I have a real Rube Goldberg setup for TV charging you might try. Get a cheap inverter rated 100-200W. Plug it into your cig lighter and run an extension cord out the window from it to the trailer shore power inlet. A little duct tape keeps the cord from dragging on the ground as you tool down the highway :)

Remember to unplug it when you stop, or bring jumper cables :lol:


Brilliant!

I have an old 400 watt inverter that I can use for this purpose. (Caution: do not read the next few sentences if you are an electrician or electrical engineer.) I have a 12v power outlet in the back of our CR-V that could power the inverter. From that location, it's just a short run to the the 120v outlet I plan to install on the tongue box. I can use this outlet to "back feed" the power convertor to charge the battery rather running thw 120v back to the power inlet of the TD. Of course, I'll need to disconnect this concoction before I power up at camp.
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Postby Btennison » Fri Aug 27, 2010 9:47 am

Hey all,

I am the one who posted about Little Guy going to a 35ah battery for their new models. Apparently a lot of owners were complaining about tongue weight and batteries being stolen so their solution was a much smaller battery, mounted inside. (be careful what you ask for, you just might get it.)

I had the same problem with my new Rough Rider and fixed it with a 2nd battery placed inside of a toolbox on the tongue.

1. When replacing the 4-pole plug with a 7-pole plug the installer has to do more than just put a new plug on. They MUST run a, at least 10 gauge, wire from the TV's battery to the correct pole on the new plug.

2. When putting a 2nd battery on the tongue of a Little Guy, the cables can be hooked to the junction box on the front of the trailer (You know, the box the trailer connector plugs into). The connectors are still there, remember white is common or ground.

I put in an additional 105ah AGM battery, giving me 140ah total. Last weekend I was out for three days, using fan & lights, battery still very strong when I picked up camp.

Bob T
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Postby DLT » Tue Aug 31, 2010 9:18 am

I also have a new Little Guy. I thought it was going to include the tongue-mounted marine battery, but in reading these forums, I guess I assumed wrong.
Will the new battery type offer significantly lower power between charges? Also, should I keep the TD plugged in?

Great forums. I'm learning more and more each day!
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Postby Btennison » Tue Aug 31, 2010 10:19 am

DLT,

The new battery is indeed much smaller than previous models. During the first couple of days, with my new Rough Rider, I found the battery drained after leaving the fan on overnight.

I decided to keep the 35ah battery and add a 105ah deep cycle AGM, giving me 140ah total. Camped three days last week without seeming to bother the battery at all.

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Postby alffink » Tue Aug 31, 2010 12:32 pm

Bob

I would take your charging steps one step further and rather than connecting directly to the TV's battery you connect to the alternator, prevent pulling down the TV's battery at the wrong time.

I took this from Larry Sorrenson's, Outbacktrailer pg 8

I decided to charge the Teardrop's battery off the tow vehicle's alternator. I ran a 10 gauge wire off the positive post of the Blazer's battery to a 40 amp circuit breaker then to a RV constant use type isolating solenoid (Standard #SS-597, $12.00) which can be purchased at any auto parts store. This solenoid is energized from a red back lit toggle switch on the dashboard that is tied into the ignition circuit, just in case I forget to turn it off. The alternator will charge the Teardrop's battery as we drive around exploring or looking for a new campsite. I ran the 10 gauge wire along the chassis wrapped inside a insulating sleeve and to a special 2 prong quick connect plug (Napa # 755-1089 $29.95 pr). This 50 amp, super heavy duty plug is used for electric forklifts, jumper cables, winches, etc. The 10 gauge wires were soldered to the plug's large silver coated copper contact pins. Since we take advantage of the Teardrop's portability, we usually change campsites daily and explore new locations. This will give us the opportunity to charge up the battery.

Larry, is one of our ultimate boondockers, and buiilt a great off road rtear-drop several years ago now, check it out at http://www.outbackteardrop.com/
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Postby Btennison » Tue Aug 31, 2010 1:04 pm

Alffink,

I certainly can't argue with anything you posted, just trying to keep it really simple due to the nature of the question.

I didn't go through steps required to isolate the tv battery from the td battery because I'm kinda anal about unplugging from the trailer whenever I stop. The added circuits are a good step though.

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Postby alffink » Tue Aug 31, 2010 1:31 pm

Bob

All the detail came directly from Larry's page.
He was extremly detailed throughout his build, I don't think he ever showed a drawing, but you could build a copy of his trailer, just by looking at the pictures and following his commentary

Didn't want to take away from your solution, but just to show how to protect the TV's battery and still charge while towing.

Not everyone is "anal" enough to remember to disconnect every time, I know I would forget, on the one stormy night, I tried to have lights or such on all night and then find my TV dead, when I needed to leave.

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