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Thread: Okay riddle me this batman!
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03-24-2021, 03:37 PM #31
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If you are going to typically dry camp/boondock, I would put 300-400W of solar on your roof, get a charge controller, and you’re done. Especially if you’re mostly out in the “sunny” west. (I have two 12v/100ah LiFePO4 batteries, 2 12v/200w panels, and Victron Charge Controller and Battery monitor.) We rarely have a campsite with hook-ups and are very comfortable we can be out for extended periods.
Good Luck!
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03-24-2021, 07:44 PM #32
So, here's a thought. Since you are indeed limited by gauge of wire to charge, the 7 pin is about useless. I am mounting a 40a booster module near the tailgate. Running 4GA wire from front battery to booster. 4GA booster cable will carry to the trailer, and connect to the lithium battery for charging.
If your interested the DIY Solar Forum is a great place for these ideas. YMMVMark and Amy Williams East Tennessee (Go VOLS), Retired and rollin'
GD 303RLS (2020), Ford F250 King Ranch (2018), Brussel Sprout (fur baby co-pilot), Champion Inverter Hybrid Generator,
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03-24-2021, 07:47 PM #33
nope, charge from the battery not the alternator.
Mark and Amy Williams East Tennessee (Go VOLS), Retired and rollin'
GD 303RLS (2020), Ford F250 King Ranch (2018), Brussel Sprout (fur baby co-pilot), Champion Inverter Hybrid Generator,
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03-24-2021, 08:14 PM #34
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If your truck has 400W AC outlet in the cab, it will support at least a 19A AC charger. Consider running an extension cord from AC outlet through truck back door and to charger. I did this once (using 19A charger) with batteries in the truck bed, while site seeing (no camper was attached) and it worked well.
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03-24-2021, 08:51 PM #35
Interesting thought. I think you could use that connection to run an extension cord to the trailer (I would cut the cord and mount the two ends of the cord on the truck and trailer) termination in the truck, and in the trailer at the charger. a charger could then be mounted in the front basement, and use an entry gland to get the wire though the wall. Might be a really easy way to provide a charging circuit while driving!
Mark and Amy Williams East Tennessee (Go VOLS), Retired and rollin'
GD 303RLS (2020), Ford F250 King Ranch (2018), Brussel Sprout (fur baby co-pilot), Champion Inverter Hybrid Generator,
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03-24-2021, 10:13 PM #36
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I haven't done any research on this but would your alternator charge your lead acid truck battery and your lithium house battery at the same time, I was under the assumption the lithium required a higher voltage to charge, that's why you are required to replace the charger?
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03-25-2021, 04:01 AM #372021 398M Full Body Paint 8k axles. LRH tires. Disc brakes.
Two bathrooms, no waiting 155 fresh, 104 black, 104 grey 1860 watts solar.
800AH BattleBorn Batteries No campgrounds 100% boondocking
2020 Silverado High Country 3500 dually crewcab Duramax Allison
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03-25-2021, 06:24 AM #38
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My two lithiums were at 70% yesterday and showed 100% after a 2 hour drive to the storage lot. We just put in the lithiums and inverter at new years and our first true boondocking trip is next weekend. I've only tested it a bit to get an idea of usage.
I know the batteries dropped about 5% overnight with the inverter off just due to 12 v load and the furnace was off. The one time I left the inverter on overnight the drop was near 20% but the furnace was running quite a bit that night with temps near freezing.
We used about 20% in the morning with us both getting ready and taking showers (so lights and fan on), microwave, coffee maker, toaster, and wife using the hair dryer.
We will have our generator but I want to get an idea of overall power usage and use it as little as possible.Imagine 2020 2670MK,
2021 RAM 2500
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03-25-2021, 06:43 AM #39
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Just some data points for you. I have a similar size rig, 100Ah Battleborn and 95 w Furrion solar briefcase.
parasitic loads (stuff that is always on, like the CO detector): 0.3 amp/hr
parasitic loads plus fridge on propane: 0.7 to 1.0 amps/hr depending on weather
above plus one vent fan: about 1.4 amps/hr
add one forgotten light, and I pull almost 2 amps/hour.
I plan on losing 2 amps per hour while on the road. (sometimes I run with the fridge live).
I typically use about 30 amps hours a day while dry camping. If its a little cold at night I might use as many as 40. That said, during the big freeze, the heater was running almost constantly and I consumed 50Ah in less than 8 hours
your 206Ah will last a couple days driving or dry camping.
On the gazinta side, in perfect conditions a 100watt solar panel will give you roughly 7 amps per hour (100watts/14 volt = ~7amps). Reality is that you'll get 30 or 40Ah on a good day. You barely keep up. The 200 watt panel showed up yesterday. I'm wiring it in today.Steve & Sheryl
Bucca and Nyx RIP-Tag and Gordon
2019 Imagine 2250RK
Ford F250
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03-25-2021, 07:11 AM #40
Incorporate a Victron battery monitor into you set up. Simple to install. You can get exact numbers
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