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Date Posted |
Forum
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RE: Lithium for dummies: need advice in simple terms
profundant,
20% to 85% for Li, so the 100 amp-hour has 75 amp-hours that are usable.
charge them to 100% once every 30 days to reset the battery management system.
Use a dc to DC charger for alternator protection, if planning to charge from the engine.
I can't use LI where I live. Too cold for them. For those that can avoid cold LiFeP04 are the cat's meow.
I would go for SiO2 myself.
Where do yo get the 20% to 85% figures, the EVE prismatic cell cycle rating is full charge to cut off at 2.5 volts @ 1.0C for 3500 cycles.
https://i.imgur.com/gOIyL1Wl.jpg
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S Davis
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12/07/22 10:59am |
Tech Issues
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RE: fell victim to the scam
I purchased 28 EVE cells from Docan Power in two purchases. The cells are excellent, but they are the LF280N which is the previous model. There have been reports of bloated cells and slightly low capacity with the newer LF280K.
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S Davis
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12/02/22 10:31am |
Tech Issues
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RE: Lithium batteries
I only plan on 350 amps max so two 250amp BMS should cover it.
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S Davis
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12/01/22 12:00pm |
Tech Issues
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RE: Lithium batteries
S Davis,
So what are the components in your battery bank? Which battery management system?
Here is most of it I am adding a victron multiplus or a outback 3000 watt inverter.
600amp buss bars
4/0 DLO cable rated at 405amps from the 600a buss bar to battery switch
3/0 DLO cable from the batteries to the negative 600amp buss bar
600 amp dual bank battery switch/one on, both on or both off
3/0 DLO cable rated at 350amps from switch to each 280ah battery
300amp MBRP fuses on the positive of each battery
Battery buss bars rated at 300amps
Daly 250amp 4-S BMS
There is also a heating system on each battery with 25 watt silicone heat pads and fans, I keep them about 50 degrees F.
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S Davis
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12/01/22 10:51am |
Tech Issues
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RE: Lithium batteries
“I could just take the two 4s BMS off and use a 100amp 8s BMS that turns all 8 cells into one battery instead of two in parrelell.”
Except you just made a 24 volt battery with a 8-S BMS. Eight cells in series makes 25.6 volts. To stay at 12 volts and up the ah you would have to use a 4-S BMS and use parallel sets of cells. The draw back is not being able to monitor each cell in the battery.
true, you would be monitering groups of cells, but if you get quality cells that are matched, thats not an issue.
I still recomend building seperat batteries unless you want to go to a higher capacity and use a stepdown. but in my case I would do another 310AH battery and have two of them. so when I am using my camper I would just use one as thats 10 days camping with the furnace running 24/7, but for my 5th wheel I could have two in there and just move one back and forth between the 5th and the camper. one will give me more usable capacity than I have with my four 6V batteries so it will be fine when I am using the camper, but when I am going for a longer dry camping backwoods with the 5th wheel I can put the second in and double my capacity. being only 48lbs its not a big deal either.
That is what I did, I have almost 2000ah in seven 12 volt 280ah batteries. I have two in my work truck with a few spares.
https://i.imgur.com/vmZmWvDl.jpg
I like thoes diaganal bus bars, where did you buy your cells from?
Steve
I cut and drilled them, it can be ordered in any amp rating. I got it at Galco, it is called Eri flex. The cells are EVE LF280N I purchased from Docan Power, they ran about $150.00 per cell delivered.
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S Davis
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12/01/22 10:32am |
Tech Issues
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RE: Lithium batteries
“I could just take the two 4s BMS off and use a 100amp 8s BMS that turns all 8 cells into one battery instead of two in parrelell.”
Except you just made a 24 volt battery with a 8-S BMS. Eight cells in series makes 25.6 volts. To stay at 12 volts and up the ah you would have to use a 4-S BMS and use parallel sets of cells. The draw back is not being able to monitor each cell in the battery.
true, you would be monitering groups of cells, but if you get quality cells that are matched, thats not an issue.
I still recomend building seperat batteries unless you want to go to a higher capacity and use a stepdown. but in my case I would do another 310AH battery and have two of them. so when I am using my camper I would just use one as thats 10 days camping with the furnace running 24/7, but for my 5th wheel I could have two in there and just move one back and forth between the 5th and the camper. one will give me more usable capacity than I have with my four 6V batteries so it will be fine when I am using the camper, but when I am going for a longer dry camping backwoods with the 5th wheel I can put the second in and double my capacity. being only 48lbs its not a big deal either.
That is what I did, I have almost 2000ah in seven 12 volt 280ah batteries. I have two in my work truck with a few spares.
https://i.imgur.com/vmZmWvDl.jpg
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S Davis
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12/01/22 12:44am |
Tech Issues
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RE: Lithium batteries
“I could just take the two 4s BMS off and use a 100amp 8s BMS that turns all 8 cells into one battery instead of two in parrelell.”
Except you just made a 24 volt battery with a 8-S BMS. Eight cells in series makes 25.6 volts. To stay at 12 volts and up the ah you would have to use a 4-S BMS and use parallel sets of cells. The draw back is not being able to monitor each cell in the battery.
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S Davis
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11/29/22 03:01pm |
Tech Issues
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RE: DC to DC charger
That is not true on newer GM HD trucks, my 2019 Chevy 2500HD sits above 14 volts, when changing my batteries it will ramp up to just above 15 volts @ 50amps.
According to the above statement I should have a smart alternator, but I have yet to see this mysterious lowering of voltage a few people on here keep stating.
Check the voltage at the starting battery immediately after starting and at the house battery.
Drive for 10-15 minutes and, with the engine still running, check those voltages again.
I have voltage meters, they stay constant above 14v and if the LifeP04 are charging it’s highe.
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S Davis
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11/28/22 10:24pm |
Truck Campers
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RE: DC to DC charger
... on newer GM HD trucks, my 2019 Chevy 2500HD sits above 14 volts, when changing my batteries it will ramp up to just above 15 volts @ 50amps.
15+ volts is all the more reason for a DC to DC Charger. I don't think Lithiums will agree with that high of a charge voltage.
I am using a 50amp DC to DC charger.
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S Davis
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11/28/22 10:17pm |
Truck Campers
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RE: DC to DC charger
What I have not seen posted is the fact that even if you use like chemistry batteries in the camper and truck, the capacity and age of the different batteries also affects charging (in addition to the small gauge trailer plug wiring). When you look at the diesels with dual start batteries, they have to be changed out in matched sets to keep optimal charging and power delivery (discharging). Putting in a DC to DC charger helps overcome these differences.
My two lifePO4 (560ah) will charge at 50 amps until they are almost completely charged with the low internal resistance unlike lead acid or agm.
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S Davis
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11/28/22 02:10pm |
Truck Campers
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RE: DC to DC charger
I just use a pair of 8 gauge wires from the truck battery to the camper batteries. That eliminates the voltage drop of the 7 pin and puts a nice charge into the camper batteries whenever I drive. I use a 200 amp blade switch that is mounted on the truck battery to isolate the truck battery when the situation calls for it, but that is rare.
The reason it’s working for you , and also for me , is the age of the truck . Newer trucks , last decade , have smart charging , meaning as soon as the starting batteries are satisfied charging goes way down , so the house batteries would get very little , especially with the voltage drop.
That is not true on newer GM HD trucks, my 2019 Chevy 2500HD sits above 14 volts, when changing my batteries it will ramp up to just above 15 volts @ 50amps.
According to the above statement I should have a smart alternator, but I have yet to see this mysterious lowering of voltage a few people on here keep stating. So maybe Ford and Ram do but my 2013 and 2019 Chevys don’t or if they do the alternator is smart enough to ramp up under heavy load.
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S Davis
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11/28/22 11:21am |
Truck Campers
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RE: CAT 3126E acceleration power loss after fuel filter change
Could something have gotten on your MAF sensor when you changed the air filter?
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S Davis
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11/26/22 11:39am |
Tech Issues
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RE: Aqua-Hot in Cold Weather - Issues with Performance?
It could be as simple as improperly set combustion, when everything was changed was the burner combustion checked? Is it only in the cold when it fails and what altitude were you at?
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S Davis
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10/27/22 11:23am |
Tech Issues
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RE: Honda 2000 won’t run my late model home furnace
Has nothing to do with the fuel source, .Has everything to do with the fuel if it's electric.
Furnace implies it burns fuel. Otherwise it would be an electric heater and 2000w is no where close to enough for a whole house electric heating system.
As others have mentioned, it's nothing to do with the sine wave but with the grounding.
Could be oil fired, they draw more power for the burner.
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S Davis
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10/07/22 04:13pm |
Tech Issues
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RE: What did you do to your truck today?
My factory tires on my 2019 Chevy were needing replaced so I upgraded to 245/70/19.5 tires, I also got the bulkhead installed to protect the aux diesel tank I installed not to long ago.
https://i.imgur.com/qTu6dihl.jpg
https://i.imgur.com/ImWWs2gl.jpg
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S Davis
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09/18/22 01:23pm |
Truck Campers
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RE: Lithium crossing the acceptance threshold…
Ya, good luck with that. There will always be those that because LifeP04 has different operational requirements will use that as an excuse that they are no good. It is different and scary.
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S Davis
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09/14/22 11:17am |
Tech Issues
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RE: Diesel Ram Owner Forced to Scrap Truck !
I deleted and raced a 2009 Duramax for a couple years, we kept the original ECM and all the emission parts to be reinstalled.
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S Davis
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09/13/22 06:47pm |
Tow Vehicles
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RE: 19.5 Hankook DH35 vs XDS2
My 19.5's do well on Stevens Pass and wear better than any LT tire I owned.
I had the same experience with the Toyo M608, they were the best winter tire I have used.
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S Davis
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09/01/22 11:05am |
Truck Campers
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RE: 19.5 Hankook DH35 vs XDS2
Ok thanks, I will probably check with a few more places.
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S Davis
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08/29/22 05:21pm |
Truck Campers
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RE: 19.5 Hankook DH35 vs XDS2
I pulled the trigger on another set of the XDS’s. Couldn’t find any first hand info on the DH35’s, so went with what I know. I appreciate the responses.
What was the cost? I just got a quote for XDS2 for $677.00 per tire. I was thinking about going with the Toyo M608z again but they had over 1000 back ordered.
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S Davis
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08/29/22 04:45pm |
Truck Campers
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