Originally posted by AaronTSchultz
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Tesla battery pack?
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Last edited by Ampster; 02-18-2019, 02:45 AM. -
P.s. Think of where we would be if the wright brothers said flying is super dangerous and you could die doing it, so we will not talk to anybody about flying until they prove to us they are smart enough to handle this technology..... just a thought.Leave a comment:
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- Tesla's "85" kWh pack consists of 16 modules of 444 cells for 7,104 total cells. So I am to gather in a 24V pack we are going to have 444 total cells, 6 of which are in series to give us 24.6 (if my math is correct) and 74 series of 6 in parallel. If the continuous discharge current at about 1c is 233A / battery and I have 4 batteries this would be close to 900A @ 24V. Currently I am going to be running an 8000W inverter which will equal 333A between all batteries at 24V. (maybe a bit more with DC AMPs, max of 40A @ 12V). My charge watts is 2400W of solar max and at 24V it will be approximately 25amps/HR/Battery which will be well below any charge threshold. I want to do a 48V charger, and 48V batteries (2 pairs of 2) which will also allow me to get a 48/8000 hybrid inverter charger. Lower the output amps to 170ish or 85 per 48V set. Is this the best design, or is there wire out there that will handle the 333A coming out of the batteries into the hybrid inverter charger? (close proximity probably 5 feet max.)?
Let me know if I am missing something. Please, I am all about learning and most of the time I am wrong, until I learn what I'm missing.Leave a comment:
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Originally posted by inetdog View Post
When the actual and purported positives are amply represented in the advertising of a product, it seems more important to deliver opposing claims or advice than to agree with the self-promotion. Those who can, from experience, support any of the marketing claims are more than welcome to do so.Last edited by Ampster; 02-17-2019, 10:05 PM.Leave a comment:
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Originally posted by AaronTSchultz View Post.........
That being said. I have been researching lithium batteries and have purchased 4 of the tesla battery modules for my Off grid School bus to RV conversion. Since my wife wants everything run off electricity we are going to need an 8000W hybrid inverter charger. My question is this. l have been able to find the safe charging parameters for 24V system, but if I run 2 in series and 2 pair in parallel for a 48V system, does anybody know what the safe charging parameters would be..........
Charging Lithium can be very simple because you do not need to think about Bulk, Absorb, Float or Equalize. You just need a charger that gives you control over voltage and amperage. Tesla uses a Battery management system and you can be the BMS or you can use one of the many BMS devices designed for after market Tesla modules.
I have been charging and discharging various Lithium Chemitries for over ten years and drive a Tesla so you can consider me a fan of the technology. I promised the Mods to explain the safety procedures so that you will not have to experience some of the "disastrous" results that some on this forum will warn you about. You clearly understand the sentiment on this thread.Last edited by Ampster; 02-17-2019, 10:13 PM.Leave a comment:
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I guess sometimes we are talking about 2 different things, If a system is sized correctly and being used in an off-grid situation where the amp draws on the battery are very low compared to the capabilities of the battery, This unit will reduce the risks significantly. However if the unit is being used for a vehicle and is drawing a very large amperage for short bursts that can heat up the batteries, then it is very important to overstate the risks as the probability of causing a runaway is much higher.
I was simply stating that there is no marketing for the 2nd hand batteries that were used in vehicles, just people stating opinions based on video's or experiences... and if those that are detracting the viability of the batteries ask another to state both sides equally, they should be willing to do the same.Leave a comment:
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Originally posted by AaronTSchultz View PostI would also not underestimate the people that "look" at this site without registering. There are a lot of smart people, and to be honest they are not going to find this page without a bit of digging and knowledge of the tesla batteries (believe me).
I would also ask those that are requesting a member state "Do not get involved without knowing what you are doing" and then state their solution to overcome this problems, follow their own advice and maybe put in their comments "TESLA IS A GREAT SOLUTION" And then state their case on why it's beneficial, but then what the warnings of such a product might be. Again, a person will not have the ability to judge for themselves if they have the correct capabilities unless both positive and negatives are addressed.Leave a comment:
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I would also not underestimate the people that "look" at this site without registering. There are a lot of smart people, and to be honest they are not going to find this page without a bit of digging and knowledge of the tesla batteries (believe me).
I would also ask those that are requesting a member state "Do not get involved without knowing what you are doing" and then state their solution to overcome this problems, follow their own advice and maybe put in their comments "TESLA IS A GREAT SOLUTION" And then state their case on why it's beneficial, but then what the warnings of such a product might be. Again, a person will not have the ability to judge for themselves if they have the correct capabilities unless both positive and negatives are addressed.Leave a comment:
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I appreciate all the comments in this post, However, being new to this board, and new to lithium (but doing my research), my 2 cents are this. If we over criticize new technology we do it a disservice and scare people off, therefore acting as the "King of Knowledge" on the new technology. Just as the person reasoned that usually new tech adopters minimize the risk of the technology, it is equally as destructive to the populous to misstate facts about the discharging rates or over exaggerate the consequences. The new technology should be presented with a fair critique of the benefits and consequences and allow people to make up their own mind on whether they are qualified enough to undertake a project. Its as though you are making the decision that if someone makes the dumb choice to not wear a helmet while on a motorcycle you are not even going to talk to them about a motorcycle... It is quite controlling.
That being said. I have been researching lithium batteries and have purchased 4 of the tesla battery modules for my Off grid School bus to RV conversion. Since my wife wants everything run off electricity we are going to need an 8000W hybrid inverter charger. My question is this. l have been able to find the safe charging parameters for 24V system, but if I run 2 in series and 2 pair in parallel for a 48V system, does anybody know what the safe charging parameters would be for the Charge Controller, the Safety Switches, and the hybrid inverter Charger, so as not to over/under charge the battery? The reason I ask is if I have to run in 24V @ 8000W It will be a constant 333Amps which is ok for the 4 batteries, but it is quite a bit for the wire as the only wire I have seen is rated up to about 200Amps.
Please let me know if I am missing something and will be able to run from the 24V batteries to the hybrid inverter/charger, or ideally let me know what the settings are for the 48V system or at least what the 100-0% are and I can do the math to get to 90%-30% for the safety settings. I would prefer the 48v system as most of the hardware is more compatible with the 2400W of solar I will have at the 48V, specifically the charger, and the hybrid inverter/charger. Thanks for helping someone learn more about this technology and get a solution to a problem.Leave a comment:
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Originally posted by Ampster View Post
That is good input. There are probably a lot more lurkers than registered users. Therefore I may have missjudged the audience. I looked for some statistics but couldn't find any. Is there any data about the number of users and the hits on this forum? Those numbers must be available somewhere and are important for driving ad revenue.Leave a comment:
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Originally posted by Ampster View Post
That is good input. There are probably a lot more lurkers than registered users. Therefore I may have missjudged the audience. I looked for some statistics but couldn't find any. Is there any data about the number of users and the hits on this forum? Those numbers must be available somewhere and are important for driving ad revenue.Leave a comment:
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Originally posted by J.P.M. View Post..................
Think of who will read what you write and never underestimate their gullibility or lack of understanding of what you communicate.Leave a comment:
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Originally posted by solar pete View PostSome issues have been
they dont work off grid as in we cant get them to work nicely with generators, we have tried a few and they just dont like them
software glitches, we are on I think the 3rd software upgrade
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Originally posted by Ampster View PostMy attempt was to show a cause and effect relationship between careless action and the fire. In my mind that was knowledge that could benefit the uninformed. One of the benefits of forums like this is to share knowledge for the greater good.
I have spent a good part of my career doing risk management and a close friend specializes in risk management with regard to chemical reactions. One of the first things that is done in risk management is to assess the risk and understand the causes and effects.
Charging every battery chemistry causes heat. Heat causes most chemical reactions to proceed faster. I guess it depend on ones point of view whether my comment was intended to increase knowledge or defend the Lithium battery industry. I will note your comments and try to choose my words more carefully.
Advocates of new/different technologies often soft peddle the drawbacks of anything they think is great.
Spend more time practicing what you just wrote rather than as an apostle for things that can be unsafe and a waste of money to the uninformed.
Think of who will read what you write and never underestimate their gullibility or lack of understanding of what you communicate.Last edited by J.P.M.; 12-02-2018, 12:11 AM.Leave a comment:
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Originally posted by Ampster View PostMy attempt was to show a cause and effect relationship between careless action and the fire. In my mind that was knowledge that could benefit the uninformed. One of the benefits of forums like this is to share knowledge for the greater good.
I have spent a good part of my career doing risk management and a close friend specializes in risk management with regard to chemical reactions. One of the first things that is done in risk management is to assess the risk and understand the causes and effects.
Charging every battery chemistry causes heat. Heat causes most chemical reactions to proceed faster. I guess it depend on ones point of view whether my comment was intended to increase knowledge or defend the Lithium battery industry. I will note your comments and try to choose my words more carefully.
I am hoping a better and safer energy storage system will eventually be invented.Leave a comment:
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