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Thread: Battery Dilemma
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03-15-2021, 03:27 PM #11
We were on a similar dilemma and went with what we have in our 35 ft sailboat. Oasis Firefly carbon foam AGM give you many of the same discharge properties of lithium. They can be drawn down to 20% all the time with no loss in number of cyles . Unlike other AGM they also have good warrenties and have 2500-3000 cycles in them. We got the when the went on sale with free shipping for $500 each I got three which if drawn down to 20% would give us 300 ah of usable battery.
We also have a robust Victron 3000/ 12/120 inverter charger. Robust 120 amp 3 stage charger, 3000 inverter, makes ALL of our 110 outlets live.
No extra system to be able to charge at less than 32 degrees .
https://oceanplanetenergy.com/advanc...asis-group-31/
We spend 80 % of our time camping boondock style.Donna and Dave
Annapolis, Maryland
2021 Grand Design Imagine 2500RL / Dodge Ram Longhorn 2500 6.4 Hemi
350 W Newapower Solar: 3000 Victron Inverter/ Charger: Firefly Oasis carbon foam AGM
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03-15-2021, 03:29 PM #12
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2018 Imagine 2600RB
2017 Ram Big Horn Crew Cab 3.92
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03-16-2021, 12:29 PM #13
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Just my two cents:
Buy two new 12v deep cycle batteries and be done with it.
Why?
1. 20-30 nights a year... those batteries will last you the 3-5 years until you get the 5th wheel.
Plus you'll have double the capacity. Five years from now, those lithium's you bought will probably be old technology and not worth the effort to convert your trailer back to lead acid for the sale.
2. While Oasis carbon batteries are the cats meow for AGM. They cost about what entry level lithium's are now.
The good thing is that they charge in cold weather.
Contrary to what was stated earlier draining them down to 20% SOC on a regular basis takes a major toll on their longevity.
(3600 cycles to 50%, 1000 cycles to 20% according to Oasis)
So, if you needed to repeatedly drain below 50%, you could do it and not ruin the batteries like you would with regular AGM batteries, but you pay the price in longevity.
You didn't appear to be concerned about having enough power with the one deep cycle, just that it was getting old.
With that being said, drawing down to 20% with one Oasis battery will get you 60% more usable power (92.8 Ah vs 57.5 Ah) than one deep cycle AGM.
Let me recap... throwing numbers around makes my brain hurt.
Recommended safe levels:
1 - deep cycle AGM 115 Ah @ 50% drain = 57.5 Ah
1 - Oasis AGM 116 Ah @ 80% drain = 92.8 AH
2 - deep cycle AGM 230 AH @ 50% - 115 Ah
So two AGM's will get you 100% more power and still last you the 3-5 years before you get a 5th wheel for about the same price as one Oasis.
3. LiFEPO4
To get almost the same Ah rating as two AGM you need 100 Ah lithium. Adding the proper charger, your at $800.
At 30, say even 50 overnights a year, it should take you 100 years to reach the life cycle of the LiFEPO4
When you start boondocking long term, or full timing, then yeah, go lithium. Until then, don't drink the cool-aid!
Hopefully, I'm getting my new 25G TH this month.
While everything I just said should apply to me too, I have been ordered by her Majesty the Queen that our 1300 watt espresso machine and 1000 watt air fryer are standard equipment for all overnights. Since we will be boondocking on BLM for weeks it's big Ah LiFEPO4 and or a lot of gas
Good luck, don't over think it like I always do
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03-16-2021, 04:00 PM #14
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I know, I think there can be a point of too much research .
The other part of the equation was the weight. The (2) 6V batteries weighed 65# a piece, so 130# on the tongue. The (1) 100AH LiFEPo4 battery is 22#.
I really hope to boondock a bit more each year. Trying to convince the current company that I can work remotely for 4-8 week stretches....
The lead-acid battery I am replacing was a pain for even weekend dry camping. Had to charge it each morning off the generator for an hour or more to make it through the day. I guess I am willing to pay a bit more in hopes it is a much better experience.
Thanks for the 2 cents!2018 Imagine 2600RB
2017 Ram Big Horn Crew Cab 3.92
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03-17-2021, 08:31 AM #15
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@Scott in GB
If you want to look at it from a purely practical side, then consider this:
$500 for two new 115 Ah AGM's and a new charger. $1000 for one entry level 200 Ah LiFEPO4 and charger.
The AGM's will give you a usable 115 Ah's, the one LiFEPO4 will give you 160 Ah usable and less weight.
The LiFEPO4 will last longer and charge faster. Maybe you'll only have to charge it once per weekend.
It costs you ruffly 30 cents a day more over the next 5 years to have the LiFEPO4 and it's good for at least another 5 years.
After 5 years, you'll be buying two more AGM's and wishing you bought the LiFEPO4.
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03-17-2021, 08:58 AM #16
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After looking at the options I went old school. I am building a bank of 4-6V Crown CR260. Price on sale is under $150 each. These are 260 AH (20 hrs) battery. All together I will have 520AH capacity 50% usable. The Trojan T145 is comparable but you wont find them for the price of the Crown batteries. My last bank of 6V was still working after 10 years. I am getting an inverter charger as the batterys do need a better charge profile that most flooded battery chargers cant provide. Even a bank of 2 of the crowns will out preform the 2 12v deep cycle if you choose the correct battery and proper cabling. Also be sure you vent correctly. Boxes should have a top and bottom vent like the original GD box is set up.
Hope this helps2018 Reflection 150 Series 220RK 5th wheel with 6K axle upgrade. B&W 25K OEM Companion, Steadyfast system, 2022 F350 SRW 6.7 King Ranch 8' bed, Trailer reverse lights, rear spare tire holder, storage tube, sumo springs, Victron MultiPlus 12/120/3000, and Solar
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03-17-2021, 11:35 PM #17
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Yo, Scott -- I'm about 8-10 years from retirement...recently upgraded with all of the electric goodies, Victron I/C, including 618AH of Lithium. My wife and I will upgrade Truck and Rig about one year before retirement. I left all of the factory cabling and components in place so I can reconnect them. My plan is, when the time comes, to list my rig for sale...it'll be $xK as is or $xK minus 3-5K if you don't want the electrical/lithium setup and I'll throw in a new Interstate battery...and take everything with me. All of my equipment was purchased in 2020 and it'll outlive me (It'll cycle a lot but never 3-5K times). Get your power and enjoy it while you're alive ...stress free...that's how I'm rolling.
GoodOz
2019 Reflection 297RSTS
2018 F250 6.7 w/2219 available payload
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03-18-2021, 08:56 AM #18
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I had a battery bank of 4 6V Interstate GC batteries and I learned how to manage and maintain them. They lasted 8 summers and were still working when I sold the boat last summer.
When it comes time for me to upgrade batteries I'll likely go that route but might only do a 2 bank system.Jay Leonard
New Port Richey, Fl
2022 Imagine 2600 RB, 2021 Ram 2500 CC Bighorn 6.7L Cummins
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03-21-2021, 11:01 AM #19
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Cross country camping this July in my fancy new 21BHE. Reservations at mostly full service campgrounds but some nights without water/power. Came with a single 12v battery. Will that be enough juice? Or will we need to be super careful?
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03-23-2021, 12:22 PM #20
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You can always take the Li-ION battery and the charger/converter with you to the next rig. When my current deep cycle dies, I'm getting 2 Lion Li-ION batteries from Costco and updating my converter/charger.
Spike & Kimberly
2020 Imagine 2970RL
2021 F-350 7.3L CC LB SRW
2002 GMC 2500HD 6.6L -Traded
What changed for the new GD...
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