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Old 08-05-2016, 09:18 AM   #15
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WOW over kill, OP is talking a TT and 3-4 days boondocking, not going into the jungle for months at a time. Let's get real not "my hobby is spending an ungodly amount on boondocking". Two good sized deep cycle batteries either 12 or 6 volts, a moderate amount of solar to recharge the two batteries, say 300 watts and a small Honda 1000 watt gen that sips fuel to recharge on a sunless day. Now we can do a bit more if AC is needed a bigger Gen maybe 2800 inverter quiet type. All this can be done at a reduced cost by a custom solar shop at much less cost and more efficient install than most dealers who are just saying we can do that. JMO

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Old 08-10-2016, 01:50 PM   #16
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If you want to go 3 or 4 days at a time all you need is two 6v deep cycle batteries with decent AHs, a good charger, and a generator if you want to extend your stay. You don't need solar for 4 days boondocking. I went with Crown, check them out. Get a good charger. Check out backwoods solar for their modified Iota 55amp 15.4v charger. Also get a trimetric to monitor your usage. Update to all LED lighting and a 12v TV and you are set. I go 4 days easy on a single charge but I have my Honda generator to charge back up in 2 hours or less at idle. We watch lots of DVDs, operate our awning, run the heat here and there etc... My resting voltage is 12.8v and I drain it down to 12.2.

PS. Handy Bob is your friend when it comes to batteries, charging and/or solar.

Have fun!
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Old 10-26-2016, 02:13 PM   #17
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Your best choice would be paired, 6V golf cart batteries. If you will do a lot of boondocking, install as many pairs as will fit.

Joel
I would ditto that! I am also a retiring electrical engineer. Its the best value for the dollar.
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Old 10-26-2016, 04:47 PM   #18
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I am with dagmandt. Get a meter for your system, that way you can see your consumption of electricity. then later you can add more batteries. or solar
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Old 11-03-2016, 09:21 AM   #19
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Lithium all the way. It costs more up front, but you save more in the long run. Smaller, almost 50% weight reduction (per usable Ah), constant voltage output across the discharge cycle, etc. You can see the benefits here: Lithium Ion Batteries for RV Motorhome House System - LFP / LiFePO4 | Technomadia and you can see a simple cost analysis here: Cost Analysis of Lithium Ion Battery Systems for RVs | Technomadia .

I'm looking at having a unit built by North American Custom Built | North American Rv (best insulation in the business) and am trying to get Starlight Solar RV Lithium Battery to do an install of a full 1000w solar panel system feeding a 1200Ah lithium battery bank. With a 6.5k Onan and collapsible wind turbine, I feel like I'm going to be able to go just about anywhere and keep myself and Dixie the Wonder Dog more than comfortable
One simple question. Whats the pricetag for the above system?
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Old 11-04-2016, 09:10 AM   #20
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Agree with Haryn that higher voltage does lead to smaller cabling requirements and consequent lower energy losses.

This also means using a lower rated controller. The voltage from panels to controller is 90 V on our 5th wheel. We have had in excess of 1.4 kW to the controller and this is only 15.5 Amps at 90 V and would be around 116 Amps at 12 V. Battery suite is 48 V nominal. This does require a 48 V to 12 V Meanwell converter as well as a 4.0 kW PSWI to run things in the cabin.

Also as noted by michero, LFP means much lower weight. it is closer to 25% of lead acid. Our 9.0+ kW-hr system (7+ kW-hrs usable) weighs about 260 pounds. An equivalent lead acid would weigh in excess of 800 pounds. 800 pounds would stress the front bay where we place the batteries which is designed to hold a large Onan propane generator. The same is true for our Roadtrek which has about 125 pounds of LFP. 400 pounds more on our 2002 Roadtrek would be a bit much. Have noted that Roadtreks now come with up to 20 kW-hrs of LFP.
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Old 11-04-2016, 03:35 PM   #21
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To me, the biggest hurdle is really upgrading RV power systems is the battery cost. That is why I encourage people to consider options that would allow them to ultimately make their battery pack into a 48 volt pack ( 4 x 12 volt or 8 x 6 volt).


The 6 volt battery options are also good, its just a lot of batteries and a lot of mass for a smaller setup.
The problem with the 48 volt idea is that it would take major modifications to one's current RV to make it work. Yes, eventually, all of our RVs will likely be higher voltage (cars used to be 6v, and are now 12v, with 24v on the horizon), but by the time that happens, those 4x12v (or 8x6v) batteries will have long ago died, and we will be buying that 24v or 48v RV, NOT converting our current 12v RV.

The OP should have no problems whatsoever boondocking 3-4 days with 2x6v batteries, especially with a bit of solar or a small gennie.
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Old 11-04-2016, 06:10 PM   #22
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Boondock a couple times to see if is for you then consider $$ upgrade.
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Old 12-01-2016, 07:17 PM   #23
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Anything is better than Group 24 except a starting battery.
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Old 12-01-2016, 09:01 PM   #24
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The problem with the 48 volt idea is that it would take major modifications to one's current RV to make it work. Yes, eventually, all of our RVs will likely be higher voltage (cars used to be 6v, and are now 12v, with 24v on the horizon), but by the time that happens, those 4x12v (or 8x6v) batteries will have long ago died, and we will be buying that 24v or 48v RV, NOT converting our current 12v RV.

The OP should have no problems whatsoever boondocking 3-4 days with 2x6v batteries, especially with a bit of solar or a small gennie.
Maybe, maybe not.

If you mostly use 120 VAC appliances, then it doesn't really matter what the house DC battery voltage is.

For Solar charging, many charge controllers can deal with battery voltages from 12 - 48, not all, but many.

For serious charging of a 12 volt house bank from the alternator, it takes a DC to DC charger already. Just replace it with a 48 volt out version.

If you need 12 volt from the house bank, there are 48 to 12 VDC converters.

It is definitely more expensive to do 48 volts vs 12 volts. If you are going to run the air conditioning or things like CPAP / Oxygen generators off of batteries sometimes, it can make a lot of sense.
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