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RE: suggestions for screen door with dog
The screen door pops open easily, so with the plexiglass over the bottom half of the door (so you can still see out of it) also put a sliding bolt inside just below the opening where you get at the main door handle.
From outside you can reach in and undo the sliding bolt. But be careful not to close the main door while that bolt is across or now you can't get in! ( You can but you have to overcome the way the door and screen door hold together)
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BFL13
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05/17/21 10:14am |
Tech Issues
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RE: Battery Indicator Lights
What is the monitor? If it is a range hood type, and it works with the tank lights etc, then the rocker switch for the battery lights might be the culprit. You can get those at the Parts Store.
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BFL13
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05/17/21 09:25am |
Tech Issues
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RE: 6 v GC batteries versus 12 v lithium deep cycle batteries
I got the (wrong?) idea the BMS cut off at 9.x (just below the depleted voltage of 10.0), was taken from the total voltage, so if un-balanced at 9.x total, one cell might be lower than one cell should be into cell damaging low voltage.
That could be wrong, so not meant to be bogus info, only a question up for clarification.
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BFL13
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05/16/21 09:43pm |
Tech Issues
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RE: 6 v GC batteries versus 12 v lithium deep cycle batteries
The Trojan guide mentioned that not balancing could lead to a "low" cell going "too low" when you got to a low SOC (as measured by the average voltage?) where the batt is "top balanced" as a reason to balance.
ISTR ( needs to be confirmed) "too low" for a cell ruins it for good.
AFAIK these RV type LFPs are not "bottom balanced".
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BFL13
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05/16/21 08:05pm |
Tech Issues
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RE: 6 v GC batteries versus 12 v lithium deep cycle batteries
There is no particular reason to be obsessed with balancing or fully charging the LFP.
This drive for some perfect charge and balance is a hangover from the days of servicing lead-acid.
Why is it being "obsessed" when you try to follow the (eg) Trojan users' guide?
On a more "casual" approach, how do you know how much you can get away with when not doing what they say? You will only know that by not doing what they say, and seeing how long you got away with it.
Many of us learned battery care from our first ("learner set") set of RV batteries. If you have the money, then you could just count your first set of LFPs as your "learner set" I suppose. :)
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BFL13
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05/16/21 07:33pm |
Tech Issues
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RE: 6 v GC batteries versus 12 v lithium deep cycle batteries
I agree. I saw where he went after another guy (Freep was it?) drove him crazy. Poor old Freep never found the block button I guess.
Freep
Wisconsin
Senior Member
Joined: 04/14/2017
View Profile
Offline
Posted: 04/19/21 01:40pm Link | Quote | Print | Notify Moderator
3 tons wrote:
“ The snark and derision is unnecessary.”??...Snark, How so ?? (apparently only when I use your same words??)..I really don’t get it - I guess I forgot to check the box for a ‘sensitivities waiver’..
3 tons, in the High NV Desert, where sensitivities are not a currency
Please stop.
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BFL13
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05/16/21 06:33pm |
Tech Issues
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RE: 6 v GC batteries versus 12 v lithium deep cycle batteries
I do not belong to the snooty LFP community, and don't even have the T-shirt, but I can read.
BB says to wait 20 minutes per battery to be sure the battery is balanced, and Trojan says 10 minutes (for one battery?), but whatever---it takes time to get that done, so how can it be a good idea to stop the charge as soon as you get to Vabs (which needs to be over 14v--ISTR BB saying it needs to be 14.2v but they also say over 14, so whatever)
2.For your Bulk/Absorption stage, the ideal voltage is between 14.2v-14.6v. For full charge and BALANCE, the absorption mode should be set to last for at least 20 minutes per battery (for multiple batteries in parallel).
I don't think a "good old boy" approach (if all else fails, read the instructions) to LFP charging is appropriate considering what LFPs cost, but YMMV.
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BFL13
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05/16/21 05:47pm |
Tech Issues
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RE: 6 v GC batteries versus 12 v lithium deep cycle batteries
Itinerant1, in your opinion, is jaycocreek seeing balancing on his smart shunt from what he describes or not?
Is that the same as what 3 tons sees? (I can't see his posts) If so, why wouldn't that show on any monitor such as the Trimetric?
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BFL13
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05/16/21 01:30pm |
Tech Issues
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RE: 6 v GC batteries versus 12 v lithium deep cycle batteries
The point being is best not give advice on something you don't understand or just guessing at. This is the regurgitation of bad info getting past as gospel. ;)
You can argue with Trojan then, since you seem to know more than they do.
"Balancing is performed when a parallel group of cells reaches a specified threshold voltage corresponding to almost
100% state-of-charge (SOC). At that point, the highest-charged cells “bleed down” a small amount to enable the remaining groups of cells to “catch up.”
( ISTR 3 tons was able to see that "bleed down" on his monitor, but others will have to confirm)
"At a voltage threshold slightly higher than the balancing point, a current interrupting device (contactor or FET array) will
open, stopping any charging current from flowing.....
" Even after the charger is unplugged, the battery may not be ready for use until it is allowed to balance for
approximately 10 minutes.....
Note: Once a set of batteries have achieved a balanced condition, they should remain balanced through normal use and charging. In order to keep batteries in balance and avoid over-discharge,
***** ensure that batteries not in storage receive a full charge weekly*** "
https://www.trojanbattery.com/pdf/Trillium_UsersGuide.pdf
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BFL13
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05/16/21 11:18am |
Tech Issues
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RE: 6 v GC batteries versus 12 v lithium deep cycle batteries
You wouldn't know cell balancing is happening off a monitor that is showing just pack voltage other than it happens at x-voltage, bms's use individual cell voltages not pack voltages.
"If" you can see individual cell voltages you would be able to see the runners that should slow down after they reach the balancing voltage while the slower cells catch-up.
ISTR 3 tons (before I blocked him) describing how he can see his LFP balancing act on his Victron monitor, but can't remember what he was observing it doing. So I ASSume that (whatever it is) could be seen on a Trimetric
time2roll said: "LFP balancing is automatic when convenient. No need to make a deliberate effort."
The LFP guides say to get to full every so often and get them balanced. So if you haven't done it past their suggested intervals, then that would require a deliberate effort to do one.
Beats me how you know you are getting it done if it doesn't show on the monitor. You LFP guys can sort that out.
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BFL13
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05/16/21 10:45am |
Tech Issues
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RE: 6 v GC batteries versus 12 v lithium deep cycle batteries
Others who have LFP will have to confirm, but AFAIK, the 13.7 is too low for the cell balancing to get started, and that needs to be done every so often. I think the balancing can be observed on the Trimetric.
The 14.4 BMS action seen might be the balancing starting, but if you are driving and stop, I don't know how it can finish balancing.
BB says:
1. passive balancing process is activated by the BMS at the top of each charge cycle, when the battery voltage exceeds around 14V. This ensures that all the cells remain at the same state of charge, which helps for pack longevity and performance.
2.For your Bulk/Absorption stage, the ideal voltage is between 14.2v-14.6v. For full charge and BALANCE, the absorption mode should be set to last for at least 20 minutes per battery (for multiple batteries in parallel).
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BFL13
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05/16/21 07:07am |
Tech Issues
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RE: Lithium battery charging in FW of truck
Confusing. If that is a solar controller, it is buck only, while the actual DC-DC charger is buck/boost, which maintains the output voltage no matter what the input voltage is.
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BFL13
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05/16/21 06:58am |
Tech Issues
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RE: 6 v GC batteries versus 12 v lithium deep cycle batteries
Will Prowse explains somethings very good and others not so much...For someone completely new to lifepo4 he is about the only one trying to explain things...
Battleborn capacity test with heat gun
Ok watched that. It was not an actual capacity test wrt the ratings of 100 AH but was a comparative test using Wh. The draw was at 80 amps if I got that right. I missed what that 1200Wh at the start was all about.
It was sort of a blur, but AFAIK he also reduced the amp load before the end for some reason I missed. ?
Anyway, whatever he was doing there was not an AH capacity test using the 20 hr rate.
"The hand is quicker than the eye" :(
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BFL13
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05/15/21 06:46pm |
Tech Issues
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RE: 6 v GC batteries versus 12 v lithium deep cycle batteries
In an actual capacity test with a heat gun,Will only got 1156 watt hours or 93+ amp hours out of the Battleborn 100ah battery..I only posted because someone here keeps saying Battleborn is 120ah but test clearly show it is not...
Did not see that one, but I doubt a heat gun would be at the 20 hour rate of 5 amps for a 100AH battery to get the AH rating.
WP seems to be pretty good with numbers and is fast talking, so hard to know if he is a flim-flam man or what he is actually doing. I don't "get" WP as a sort of LFP guru/expert for that reason. IMO check his numbers very carefully and still wonder what he might have got past you.
OTOH, you might still win the Kewpie doll! :)
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BFL13
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05/15/21 05:46pm |
Tech Issues
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RE: 6 v GC batteries versus 12 v lithium deep cycle batteries
but BattleBorn deliberately derates their 100 amp-hour to 100 from a "real" 120 amp-hour.
Please explain this as Will Prowse tore one down and did the math off the actual cells which in turn produced 1305.6 watt hours compared to there advertised 1280...Not that much difference really certainly not 20 amp hours IMHO..
He said each of the 120 cells has 3.4 AH and used 3.2v to get 10.88Wh.
He then did 120 x 10.88 = 1305.6Wh
DOT shipping "nominal" voltage is 12.8 so 100AH x 12.8 = 1280Wh. He then said this meant the BB had "extra capacity"! (insert own comment on why he acted so happy to "learn" that) He did not give the "real AH".
But if each cell is 3.4AH (don't know where that came from), then each of the four packs of 30 cells is 30 x 3.4 = 102AH and in parallel, that is 102AH for the battery
Note that 12.8 x 102 = 1305.6. (of course)
IMO you should use the voltage for the the capacity when full , said to be 13.6 for LFP to get your Wh, so if it is really 102AH then Wh would be 1387.2.
But voltage drops to 13.3 when a load is applied, so since say 99% SOC is then 3.3, then 100.98 x 13.3 = 1343 Wh
None of which says how low you can go while deciding on the "usable AH".
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BFL13
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05/15/21 05:00pm |
Tech Issues
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RE: 6 v GC batteries versus 12 v lithium deep cycle batteries
Ignoring price (very hard to ignore), Lithium Iron Phosphate (LiFePO) batteries are far superior to any lead acid battery for 2 reasons :
• You can discharge them down to almost 0% SOC with no damage (more usable energy for the same rating)
I'm sure Stircrazy would subscribe to this view point--but BattleBorn deliberately derates their 100 amp-hour to 100 from a "real" 120 amp-hour.
So far as I am aware the rest of the Li makers don't protect the end user this way.
Could it be the battery management systems are keeping the bottom 20% from being used?
https://www.lynaclithium.com/wp-content/uploads/2020/10/12.8V-100Ah-True-Series-Quick-Sheet.pdf
What is TRUE Series?
True usable power rating system. Unique to Lynac Lithium, True Series
describes the amount of Real Usable Energy you can expect from our batteries
based on 80% Depth of Discharge. If it says 100Ah on the case, you get 100Ah!
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BFL13
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05/15/21 02:43pm |
Tech Issues
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RE: Mounting Truck Camper on Top Of 5th Wheel Hitch Rails
I have the 5er rails in my F350. We transferred a Lance 1130 from Michigan to Minnesota on top of a frame of treated 2x4s flat and toenailed with screw. The camper ended up slipping back about 8" from the bumping down the freeway. The tiedowns were vertical so they did allow the camper to slide and the wood was slightly damp from a rain. I stopped a couple of times to readjust and retighten the tiedowns.
I purchased a rubber livestock mat and will be using it next weekend but I also plan to remove the 5er rails and reinstall them when we use the 5er again. There is only 5 bolts for each rail so it wont be to bad for meI did not like the camper sliding.
Do you mean the boards slipped on the metal truck bed? I can see that happening. Especially with the corrugated bed, less surface area.
On mine with the mat, the boards don't slip with the camper on. Maybe try it with the mat before going to the trouble of removing the 5er rails. Re-installing the rails each time could be a hassle if they need to be aligned just right to get the hitch on, and there is wiggle room in the rail bolt holes.
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BFL13
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05/13/21 11:28am |
Truck Campers
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RE: Mounting Truck Camper on Top Of 5th Wheel Hitch Rails
Started with a camper and the full bed mat. Got a 5er, they cut the bed mat in half across between the wheel wells, and cut slots in each half for the rails. Still have a bit of rail height above mat.
Whenever have to carry 4 x 8 sheets in the truck, use three 8 ft 2x4s to clear the hitch rails
Then got another camper years later. Used the 2 x 4 boards under the camper same as when carrying 4x8 sheets. The camper hold downs keep it all in place. The back of the camper hangs down below the bed so no problem with boards coming out the back with no tail gate there.
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BFL13
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05/12/21 06:29pm |
Truck Campers
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RE: Lithium battery charging in FW of truck
Voltage drop goes with the amps. More amps , more drop. 7-pin is low amps so not much drop. The lower voltage comes when the alternator regulator reduces its voltage once the starting batt is recharged.
IMO wait for more info to decide what to do if you still want any alternator charging, as there is conflicting advice on that.
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BFL13
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05/12/21 05:39pm |
Tech Issues
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RE: Lithium battery charging in FW of truck
With solar at say 14.5v and alternator charging at say 14.1, you will not get the total amps. You will get all the solar amps, but only some of what the alternator amps would be by themselves without the solar.
These are not real numbers, but just examples: Solar alone 20 amps, alt alone 10 amps, together 25 amps.
A DC-DC can be set to the same voltage as the solar, so they would add their amps for the total of what each could do by itself.
This does not answer the OP's question re the LFP draw with just the 7-pin, but he did say he wants to have both solar and alt charging. So you get more amps with the DC-DC, plus it isolates the LFP house batts from the alternator/starting batt, which solves that too.
If the OP does not want a DC-DC, then knowing his 7-pin amps (already lame) will be even less with the solar on, he might as well pull that 7-pin 12v fuse and just use the solar. Solves any LFP draw issue if there really is one.
Need to resolve is what amps the alternator can run continuously, and what wiring/fuse is needed. Mex seems to say the OP's alternator can't take even the 1/3 amps like PT said. That needs to be cleared up.
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BFL13
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05/12/21 03:28pm |
Tech Issues
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