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Old 12-21-2015, 09:26 AM   #11
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Harbor Freight has a cheap 3 panel set that can be bought for around $175.00. 45 watts total plus charge controller and a small inverter... it is the system I learned on and is great for short trips..
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Old 12-21-2015, 10:13 AM   #12
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Quote:
Originally Posted by TommyAjax View Post
Hi All,
<snip>
What I am thinking of doing is getting 2-3 AGM 12v batteries in the 100 amp hour range (each) so that I can mount them inside of my TT under a bench that is overtop of the axles so that I can keep the trailer balanced (ie not add or take away from my tongue weight).
</snip>
The problem with moving them inside is that they give off a poisonous gas. If you do move them inside, ensure you put them in a sealed battery box with a vent directly outside to the TT. Similar to what is in the front of most 5er's. It's a sealed box, with a vent tube to the outside.

QuickHowTo: Battery Boxes
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Old 12-21-2015, 10:23 AM   #13
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Originally Posted by SMS1115 View Post
The problem with moving them inside is that they give off a poisonous gas. If you do move them inside, ensure you put them in a sealed battery box with a vent directly outside to the TT. Similar to what is in the front of most 5er's. It's a sealed box, with a vent tube to the outside.

QuickHowTo: Battery Boxes
I thought that the benefit of the AGM batteries was that they didn't off-gas as they are a sealed unit without water and could be used anywhere and in any position?
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Old 12-21-2015, 11:06 AM   #14
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Just to look at this from a slightly different perspective:


For 2-3 days, can you cut back on DC usage?


I found the OEM battery was good for 36+ hours of 'don't care' electrical load (heater used as needed, lighting, etc.)


If I ran the genset for 3 hours, the battery would be fully topped up enough for the next 22 hours.


With a decent solar panel and judicious electrical usage, a genset may not be needed.
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Old 12-21-2015, 11:23 AM   #15
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Originally Posted by TommyAjax View Post
I thought that the benefit of the AGM batteries was that they didn't off-gas as they are a sealed unit without water and could be used anywhere and in any position?
You are correct here.

I'm looking at a similar situation. Fortunately, I have PLENTY of payload. So my current plan is to put a couple good 12V flooded-cells on the tongue and move on. IF we stay out for more than one night without charging, I would be surprised; 2 nights would probably be our absolute max.

I'm looking at it from the standpoint of a long drive as well. I figure if we're just stopping in a parking lot for a few hours for some shuteye, we're not going to be using much juice. Depending on where we decide to stop, we could catch a movie and dinner out, and just crash out in the trailer. And while the truck won't get a real good charge on a bank that's severely depleted, I think it might do okay driving another 6-8 hours between stops, especially if we keep usage VERY light during the night.

My biggest fear with what you're attempting would be re-routing the wiring to relocate the battery bank. I'm not too strong electrically, so I would have to do a lot of research for something like that.

Let us know what you eventually decide to do, I'm curious.
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Old 12-21-2015, 11:36 AM   #16
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Originally Posted by mike837go View Post
Just to look at this from a slightly different perspective:


For 2-3 days, can you cut back on DC usage?


I found the OEM battery was good for 36+ hours of 'don't care' electrical load (heater used as needed, lighting, etc.)


If I ran the genset for 3 hours, the battery would be fully topped up enough for the next 22 hours.


With a decent solar panel and judicious electrical usage, a genset may not be needed.
My primary concern is being someplace cold and not being able to keep the furnace running for even one night. We have only had the trailer since Sept and the dealer provided battery is only ~60 amp hours. We plan on driving to Florida in February and stopping at Walmarts on the way, so the temp solar power isn't really useful to me on this one (I will likely get a portable panel down the road as I am a fan - 7.5kw installed on my house). So that is why I figured that if I could start by building up my battery bank first, it will meet my short-term needs of being able to go 2 nights off-grid in Walmart parking lots, and I need to put the batteries in the trailer over the axles so that my tongue weight doesn't go up too much.
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Old 12-21-2015, 11:48 AM   #17
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Originally Posted by Camper_bob View Post
You are correct here.

I'm looking at a similar situation. Fortunately, I have PLENTY of payload. So my current plan is to put a couple good 12V flooded-cells on the tongue and move on. IF we stay out for more than one night without charging, I would be surprised; 2 nights would probably be our absolute max.

I'm looking at it from the standpoint of a long drive as well. I figure if we're just stopping in a parking lot for a few hours for some shuteye, we're not going to be using much juice. Depending on where we decide to stop, we could catch a movie and dinner out, and just crash out in the trailer. And while the truck won't get a real good charge on a bank that's severely depleted, I think it might do okay driving another 6-8 hours between stops, especially if we keep usage VERY light during the night.

My biggest fear with what you're attempting would be re-routing the wiring to relocate the battery bank. I'm not too strong electrically, so I would have to do a lot of research for something like that.

Let us know what you eventually decide to do, I'm curious.
Thanks...going to track down my manuals to see of there is anything on the wiring to see if there is anything obvious. I'm not an electrician either, but I am comfortable working with basic circuits.

What might be the easiest for my near term need, is to buy the 2 AGM batteries and get them charged up and just carry them in the trailer. Then when we stop, swap the dealer supplied battery for a charged 100 amp hour AGM one to get through the night...leave it on the mount for the truck to charge it back up a bit during the next day's drive. Then when we stop on night 2, put in the other 100 amp hour AGM that I know is fully charged. I can then put everything on my smart charger when I get to the campground (State parks) in Florida and do the same swaps on the way home.
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Old 12-21-2015, 12:05 PM   #18
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Quote:
Originally Posted by TommyAjax View Post
My primary concern is being someplace cold and not being able to keep the furnace running for even one night. We have only had the trailer since Sept and the dealer provided battery is only ~60 amp hours. We plan on driving to Florida in February and stopping at Walmarts on the way, so the temp solar power isn't really useful to me on this one (I will likely get a portable panel down the road as I am a fan - 7.5kw installed on my house). So that is why I figured that if I could start by building up my battery bank first, it will meet my short-term needs of being able to go 2 nights off-grid in Walmart parking lots, and I need to put the batteries in the trailer over the axles so that my tongue weight doesn't go up too much.
The good news is that your TT's battery is charged while underway from your tow vehicle. So, 6-8 of driving should be more than enough to carry you through the night.

Are you sure the battery is only 60Ah? That's a motorcycle battery, only enough to stop the trailer after a breakaway. You need several hundred Ah in order to go off-grid.
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Old 12-21-2015, 12:27 PM   #19
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(I will likely get a portable panel down the road as I am a fan - 7.5kw installed on my house).
Do you park your TT at home?

If so, you could purchase 2 or 3 residential SOLAR panels (mounted on the TT roof) like you have on your house, wire in a transfer switch that will switch between (A) to your TT batteries (B) to Enphase 250 watt micro inverters wired to your Shore-Power cable (with proper protection circuitry) that is plugged into the house's SOLAR breaker box. Boy, would the local code enforcement group love that idea.

Don
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Old 12-21-2015, 12:43 PM   #20
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Originally Posted by mike837go View Post
The good news is that your TT's battery is charged while underway from your tow vehicle. So, 6-8 of driving should be more than enough to carry you through the night.

Are you sure the battery is only 60Ah? That's a motorcycle battery, only enough to stop the trailer after a breakaway. You need several hundred Ah in order to go off-grid.
The battery provided by the dealer is a Deka Marine Master DP24. On the Trojan website there is a document (link below) that flags it as a 65 AH...that's why I want to bump up my capacity. I could just get a single larger capacity battery for one night stays, but figure I might as well get two and have a bit more confidence, especially in the cold.

http://www.trojanbattery.com/pdf/Tra...ide_201105.pdf
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