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 > Your search for posts made by 'StirCrazy' found 555 matches.

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RE: Victron smart shunt vs lifepo4 battery question?

what charger are you using? Steve
StirCrazy 04/06/21 09:07pm Tech Issues
RE: Android Tablet eReader

I have a hundred dollar 8" Android tablet and would like to explore reading electronic books on the cheap. What is a good app and book source most library systems have apps and free downloads. if you decide you like them concider buying a real e-reader like kindle or kobo. they are easier on the eyes with the e-ink tech and the battery lasts forever. Steve
StirCrazy 04/05/21 06:42pm Technology Corner
RE: solar panels with diodes between each cell

OK, it's panel. Not sure if the Canadian spelling is pannel. nope I just suck at spelling, but if you have nothing better to do then look for spelling errors you need another hobby.
StirCrazy 04/05/21 06:37pm Tech Issues
RE: solar panels with diodes between each cell

The output is between 46 and 47 volts depending on the panel. That's a nice sweet spot for safe operation voltage. thats the open circut voltage, which hopefully you never see except when your testing the pannel when you first buy it. thats a 24v pannel. the 325 is the exact same as what I have, just a different name. Steve
StirCrazy 04/04/21 06:32pm Tech Issues
RE: solar panels with diodes between each cell

Hi folks, I stumbled across these panels today: https://ae-solar.com/wp-content/uploads/2018/10/AE_P6-36_155W-175W.pdf They apparently have diodes between each and every cell which gives them an advantage for series connection of the panels (i.e. shade tolerant) Does anyone know of other panels that do this? where did you read about the Diodes, I cant find anything in the link you posted. Most solare pannels have bypass and blocking diodes, which allows sections to be bypassed in shady conditions or what ever. the lower end only have 3 and higher end ones have more. the cost of adding the diodes is pretty substantial, so if some one is putting them on every cell that would be wild but I wonder how much of a difference it would be from say every second or every 3rd cell. for me its a 12V pannel so I am not sure I would realy look at it for use, 24V pannels let you run smaller wire and such. but I also have a split cell pannel and they are touted for being more efficient in low light and partial shading situations so dues to the smaller cell design allowing them to have a slightly higher output per cell. doing some more digging into this my split cell 24V pannel has a bypass diode for every cell, which is why thes pannels are so good in partial shading so I guess that must be becoming a pretty standard thing now. Steve
StirCrazy 04/04/21 09:38am Tech Issues
RE: How to build a LiFePo4 battery bank.

How much for shipping? that was included in the price per cell. of course there is a minimum of 4 cells per order and the more cells you buy at ones the lower the price. that other place wanted 740 for 4 cells and 1300 for chipping, which is a huge rip off. that what what you expected about 2 years ago. Steve
StirCrazy 04/03/21 04:40pm Do It Yourself Modifications and Upgrades (DIY)
RE: How to build a LiFePo4 battery bank.

Email them and ask. And their price may be competitive with roll your own. Na, the whole point of roll your own is to be able to pick the BMS you know is quality and has the features you want, and the manufacture of the cells. the dealer above is only one of many, for some reason there is no extra shipping to the US but there is to Canada, but there are dozens of distributers and lots include shipping. I think the one I found was aout 178.00/280ah cell order of 4, shipped to canada. they drop it to 137/cell if your buying 16, but there prices are always moving a bit so Ill sww what they are when I actualy put my order in. I am just trying to figure out how many I am ordering right now. I need to empty the front storag on the 5th wheel and see how much work it would be to relocate the batteries from the very front to just behind the storage where it is part of the heated basment. if I get 16, I could put 840AH in the fith wheel and 280 in the camper. that woul dgive me roughly 4 times the usable AH in the 5th, and almost three times what I have in the camper. but that could be another thing I have to sort out, I use the camper more in the sholder seasons when I am doing my own thing so even though it has 325 watts of solar a few cloudy days with only 105 usable Ah messes things up when you need the furnace on. so the other option might be to go even and 560ah in the 5th (2.3 times the present capacity) and 560ah in the camper. or maybe I look at getting 20 cells.. I have the luxery of time as the GC batteries in the camper are only 1 year old, and even though the GC's in the 5th wheel are in need of replacment they still hold good enough thanks to the solar, so I can watch prices and buy when they drop again. Steve Steve
StirCrazy 04/03/21 08:50am Do It Yourself Modifications and Upgrades (DIY)
RE: How to build a LiFePo4 battery bank.

did they charge shipping seperate, I just looked at them they want 738 cdn for the batteries then 1300 shipping LOL... got to love thoes rip off guys. but 310AH nice. Steve Try these folks instead: [email protected] for what? they only sell premade batteries. Steve
StirCrazy 04/02/21 06:41am Do It Yourself Modifications and Upgrades (DIY)
RE: LifePo4 Voltage at .5C - .6C Discharge

Hi BFL13, As a battery discharges the voltage starts to drop. By the time it reaches 50% of the amp-hours, voltage is some what lower than it was at 75% state of charge. When the battery reaches 10% state of charge voltage is again lower. Since watts are the product of amps X volts, and the voltage is lower--there is less energy in watt-hours remaining, even though the amp-hours are at 50% of full. I started a thread on Battery Monitoring basics that shows some graphs to help bend your mind around this. I know you hate watts--but watt-hours are a better measurement of energy than amp-hours. when they wredoing the capacity tests on LFP batteries they found the amps went up in relation to the volatage going down, so that would suggest the capacity remains constant going by watt-hours. Steve
StirCrazy 04/02/21 06:37am Tech Issues
RE: LifePo4 Voltage at .5C - .6C Discharge

After BMS cut-off you can charge the batt and eventually it will come back on. Until it comes back on you have no 12v in the RV from that batt. If you have an inverter/charger, which needs 12v to even be on so you can use its charger, how are you going to use the inverter/charger? It is dead. You can use your converter as long as you have a gen to run it with. The converter can also then supply 12v to the RV while you wait for the battery to come back to life. If your installed gen needs that batt to start it, your gen can't be used to run the converter. A portable gen would start. Solar could be used unless this happens at night. So you need a way to deal with it in your RV. Too late if it happens and you never thought of that. this isnt a problem spicific to LFP, you run any battery dead and you need a way to charge it. I think part of building a battery no matter what the type is insuring you have enough capacity to do what you do. if not then you have to ensure you have a way to charge it. Steve
StirCrazy 04/02/21 06:34am Tech Issues
RE: How to build a LiFePo4 battery bank.

My first cells should arrive late this month or next. did they charge shipping seperate, I just looked at them they want 738 cdn for the batteries then 1300 shipping LOL... got to love thoes rip off guys. but 310AH nice. Steve
StirCrazy 04/01/21 08:01pm Do It Yourself Modifications and Upgrades (DIY)
RE: LifePo4 Voltage at .5C - .6C Discharge

Uh-oh.... FLA Passports may soon be required?? Unsupervised, overcharged LFP erupts into a flaming inferno ruining camper’s holiday - Campgrounds to consider ban of RV’s with LFP’s - WT#O?? April fools!! (sorry, I couldn’t resist - just found myself caught up in all the grifting - lol :) ) 3 tons dont laugh, while it is a small hazard and highly unlikly with LiFePo4, people who are using old packs out of tesla's and nickel cad and such it is a real concern.. Steve
StirCrazy 04/01/21 07:58pm Tech Issues
RE: LifePo4 Voltage at .5C - .6C Discharge

If you did have BMS cut-off, don't forget you will need a way to get the battery bank going again by recharging it. BB suggests you have a charger that can do that. EG my Vector smart charger will not do anything until the battery voltage is above about 5 volts, so it would not work on a cut-off LFP. wow, man is it good thing we have chargers built into our RV's or we would be totaly screwed.. actualy it would because a BMS cutoff point is above 5V, if I was setting up my own it would cut off at 11.9 but even if you have it cut off at 10.1V that is still above 5V. Steve This depends on the battery and the charger. Some batteries have a reset, either a physical button, or a switch in the bluetooth app (what mine has) to reset the BMS. Some BMS will also still show a voltage on the battery terminals, even after cutoff, but won't provide any current - this is often enough to satisfy a 'smart charger' without a lithium mode. Most converters don't care if there is a battery present and will reset your BMS no problems, and many modern smart chargers (either solar or plug in) have a lithium mode, which will provide voltage even if the charger doesn't see a battery. There is a sub-set of older pre-lithium 'smart chargers' that will have an issue with this, but there is usually a way around this, either through solar, or using the vehicle alternator, or even a jump pack. all the BMS I have been looking at have automatic reset once the battery charge rises a spicific amount it will turn the discharge function back on. they usaly show disconect at 10.8 and reconect at 11.3 type thing. but they are customizable so you can put them where ever you want. I can see where the older "smart chargers" would be an issue, but if some one is building a functional electrical system on a RV using LFP as a battery, why would you have a smart charger instead of a LFP compatable converter? I imagin we would find issues with any type of set up but a older smart charger would be some one conceniously pick older stuff and takes newer stuff out instead of building the system properly. I believe this is why people have so many issues with LFP, because a lot of systems seam to be throwen togeather haphazardly with out any forthought. Steve
StirCrazy 04/01/21 07:55pm Tech Issues
RE: How to build a LiFePo4 battery bank.

Ok so why is the video flawed? From your first post: this video is pretty decient on how to do it, what is missing is some sort of case. the Prismatic cells like to be clamped togeather slightly if you going to be running high currents. I have seen cases made out of wood with threaded rod providing the pressure, and several other ways also. also I am not a fan of the BMS he uses, there are lot better ones, but he explains he needed the high capacity one to do a torture test on the cells. 280Ah LFP build Your words. I find your comments are often flawed. I'm sure you feel the same way about mine. because he is testing and not building a case you think it is flawed? ill tell you what I'll get a different link for you so you can understand it. here is a different guy who is spicificly building for an rv. keep in mind shipping prices have come down even more since his videos. he does a build with added redundency which is actualy a neet way to do it. componants here is one using premade battery boxes. of course this is going to depnd on the size of cells you get. another build Steve
StirCrazy 04/01/21 08:38am Do It Yourself Modifications and Upgrades (DIY)
RE: LifePo4 Voltage at .5C - .6C Discharge

Will Prowse says you can tell the state of charge for a Lifepo4 battery,or get a good idea without a load..He is talking about the Battleborn.. Will Prowse on SOC lifepo4 He seems just to be regurgitating the stuff from Battleborn. I have no idea why people seem to think this guy is some sort of expert. Anyway, this should highlight the issue of trying to determine SOC from voltage: https://www.bestgobattery.com/templates/yootheme/cache/curve9080-a057194e.webp This is the voltage of several different cells at 80 and 90% SOC vs temperature. First notice the difference is at most 0.004V, and that the curves cross as a function of temperature, so depending on the battery temperature 80% SOC may actually have a higher voltage than 90% SOC. At best you may be able to tell if a battery is full or mostly flat, but not much more than that. I dont think he is any sort of expert, he is just curious with youthfull exubrance and a little goofy. he also seems to have access to a lot of stuff to test. but yes on a static LFP you can get a very reasonable measurment of soc from voltage in a percentage of capacity, once you put a load on it thats out the window and you need predictive coulumb counting (did I butcher that?) I have ecen seen a couple meters that claim "advanced predictive coulumb counting" havent read of to see what the difference is yet but its suposed to be even more accurate. Steve
StirCrazy 04/01/21 08:09am Tech Issues
RE: LifePo4 Voltage at .5C - .6C Discharge

If you did have BMS cut-off, don't forget you will need a way to get the battery bank going again by recharging it. BB suggests you have a charger that can do that. EG my Vector smart charger will not do anything until the battery voltage is above about 5 volts, so it would not work on a cut-off LFP. wow, man is it good thing we have chargers built into our RV's or we would be totaly screwed.. actualy it would because a BMS cutoff point is above 5V, if I was setting up my own it would cut off at 11.9 but even if you have it cut off at 10.1V that is still above 5V. Steve
StirCrazy 04/01/21 08:01am Tech Issues
RE: Daly BMS gone crazy..Update Opinions

you do have another option here, you could buy a victron bluetooth smartshunt and be able to monitor everything thst will help you determin if your BMS is working. I'm seriously concidering just that but I'm not sure what stats that shunt shows and how accurate they are....I suppose being Victron, there as accurate as can be.. there are actualy quite a few things showen and you can set alarms for different things also. personaly I think Victron stuff is way over priced, sorry I am not a Victron fan boy, but there smart shunt doesnt seam to be priced to bad. Steve
StirCrazy 04/01/21 07:54am Tech Issues
RE: Daly BMS gone crazy..Update Opinions

I guess this is the final update from the seller: This glitch is entirely to do with the Bluetooth and not the BMS. The BMS is set at the default settings which are best for the battery. So it will perform as it was designed to. We are offering all customers that have a failing Bluetooth 2 choices: (1) Total Refund. (2) $50 rebate by PayPal. Until we figure out the revamp on the Bluetooth we will not offer this feature with the Cased Batteries with this option, instead we will program them and reset the password. Let me know what you want to do. Sorry again for the inconveniences. What is your opinion of this e-mail.. 1-Do you think the BMS is okay as he stated? I guess we never really know if a BMS is okay buying a cased battery until something happens,hence Will P tearing down batteries with claims of cold cut off that do not work..But I haven't seen one with a totally failed BMS yet leading to a completely destroyed battery.. What's your opinion? you do have another option here, you could buy a victron bluetooth smartshunt and be able to monitor everything thst will help you determin if your BMS is working. Steve
StirCrazy 03/31/21 07:47pm Tech Issues
RE: LifePo4 Voltage at .5C - .6C Discharge

Beats me! You LFP guys can figure it out if you need to :) dont need to , have seen enough 1C discharge tests using inverters and the inverter doesnt alarm untill the LFP is pretty much done its full capacity. I am not sure what the normal inverter starts beeping at , but I know I get know where near full capacity with four 235ah GC batteries ;) Steve
StirCrazy 03/31/21 07:36pm Tech Issues
RE: How to build a LiFePo4 battery bank.

For those on a budget, these weed grade B cell and the author did make "studs" to use on the screw in terminals that were not in the best of shape. Cheap fix ! After the build, it was tested successfully to full capacity. I would recomend making studs for the "A" grade also. the thread depth isnt that deep so when you start hooking stuff up its nice to have that extra lenght so your not striping the top threads out. Steve
StirCrazy 03/31/21 07:31pm Do It Yourself Modifications and Upgrades (DIY)
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