I saw a video where someone was separating the laminations and removing the lithium strip. When put in water it reacted most demonstrably. Because of this I tried to specify IP 67 or IP 68 batteries with BMS. Not apparently in 100 AH group 31 to be had. It scares me to be running expensive lithium batteries whose BMS or worse can be destroyed in a skiff overturn coming ashore. It's only a matter of time before a cruiser wets his batteries trying to come ashore in difficult but necessary circumstances.On Sun, Feb 16, 2020 at 2:33 PM THOMAS VANDERMEULEN <tvinypsi@gmail.com> wrote:It may be useful to everyone to know if you've ever experienced your LiFePO4 batteries becoming too warm while charging or while they were under load.
Frankly, I've begun to wonder if the demands of any kind of boating activity on a battery bank would ever push or pull enough amps to raise the temperature of the typical LiFePO4 pack into a hazardous range.
However, if you've had this experience, I would ask that you reply to this message and please describe your setup and conditions for us.
One might say, for instance, you use 100Ah prismatic battery cells in a 16S1P configuration, bound with end-plates and held in a heavy plastic box with lid, and you were {charging|discharging} at a rate of approximately {__ Amps}. Batteries were measured with a {________} at a temperature of {_______}.
This won't be a statistically a meaningful survey, of course, but if anyone *has* had an overheating experience, it could make for safer boating for everyone if the rest of us were to know the particulars.
Thanks so much!
[-tv]
Tom VanderMeulen
"Grace O'Malley"
Cape Dory 27, #257
Monroe, MI
Sunday, February 16, 2020
Re: [electricboats] Do your LiFePO4 batteries ever get too warm?
These lifepo4 battery configurations need complete waterproof for marine application.
Re: [electricboats] Do your LiFePO4 batteries ever get too warm?
We have same set up with 4 parallel. Run 5 hours no issues. Continuous checking with heat sensor camera. 360 ah
It may be useful to everyone to know if you've ever experienced your LiFePO4 batteries becoming too warm while charging or while they were under load.
Frankly, I've begun to wonder if the demands of any kind of boating activity on a battery bank would ever push or pull enough amps to raise the temperature of the typical LiFePO4 pack into a hazardous range.
However, if you've had this experience, I would ask that you reply to this message and please describe your setup and conditions for us.
One might say, for instance, you use 100Ah prismatic battery cells in a 16S1P configuration, bound with end-plates and held in a heavy plastic box with lid, and you were {charging|discharging} at a rate of approximately {__ Amps}. Batteries were measured with a {________} at a temperature of {_______}.
This won't be a statistically a meaningful survey, of course, but if anyone *has* had an overheating experience, it could make for safer boating for everyone if the rest of us were to know the particulars.
Thanks so much!
[-tv]
Tom VanderMeulen
"Grace O'Malley"
Cape Dory 27, #257
Monroe, MI
Re: [electricboats] Do your LiFePO4 batteries ever get too warm?
I saw a video where someone was separating the laminations and removing the lithium strip. When put in water it reacted most demonstrably. Because of this I tried to specify IP 67 or IP 68 batteries with BMS. Not apparently in 100 AH group 31 to be had. It scares me to be running expensive lithium batteries whose BMS or worse can be destroyed in a skiff overturn coming ashore. It's only a matter of time before a cruiser wets his batteries trying to come ashore in difficult but necessary circumstances.
On Sun, Feb 16, 2020 at 2:33 PM THOMAS VANDERMEULEN <tvinypsi@gmail.com> wrote:
It may be useful to everyone to know if you've ever experienced your LiFePO4 batteries becoming too warm while charging or while they were under load.
Frankly, I've begun to wonder if the demands of any kind of boating activity on a battery bank would ever push or pull enough amps to raise the temperature of the typical LiFePO4 pack into a hazardous range.
However, if you've had this experience, I would ask that you reply to this message and please describe your setup and conditions for us.
One might say, for instance, you use 100Ah prismatic battery cells in a 16S1P configuration, bound with end-plates and held in a heavy plastic box with lid, and you were {charging|discharging} at a rate of approximately {__ Amps}. Batteries were measured with a {________} at a temperature of {_______}.
This won't be a statistically a meaningful survey, of course, but if anyone *has* had an overheating experience, it could make for safer boating for everyone if the rest of us were to know the particulars.
Thanks so much!
[-tv]
Tom VanderMeulen
"Grace O'Malley"
Cape Dory 27, #257
Monroe, MI
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[electricboats] Do your LiFePO4 batteries ever get too warm?
It may be useful to everyone to know if you've ever experienced your LiFePO4 batteries becoming too warm while charging or while they were under load.
Frankly, I've begun to wonder if the demands of any kind of boating activity on a battery bank would ever push or pull enough amps to raise the temperature of the typical LiFePO4 pack into a hazardous range.
However, if you've had this experience, I would ask that you reply to this message and please describe your setup and conditions for us.
One might say, for instance, you use 100Ah prismatic battery cells in a 16S1P configuration, bound with end-plates and held in a heavy plastic box with lid, and you were {charging|discharging} at a rate of approximately {__ Amps}. Batteries were measured with a {________} at a temperature of {_______}.
This won't be a statistically a meaningful survey, of course, but if anyone *has* had an overheating experience, it could make for safer boating for everyone if the rest of us were to know the particulars.
Thanks so much!
[-tv]
Tom VanderMeulen
"Grace O'Malley"
Cape Dory 27, #257
Monroe, MI
Groups.io Links:
Frankly, I've begun to wonder if the demands of any kind of boating activity on a battery bank would ever push or pull enough amps to raise the temperature of the typical LiFePO4 pack into a hazardous range.
However, if you've had this experience, I would ask that you reply to this message and please describe your setup and conditions for us.
One might say, for instance, you use 100Ah prismatic battery cells in a 16S1P configuration, bound with end-plates and held in a heavy plastic box with lid, and you were {charging|discharging} at a rate of approximately {__ Amps}. Batteries were measured with a {________} at a temperature of {_______}.
This won't be a statistically a meaningful survey, of course, but if anyone *has* had an overheating experience, it could make for safer boating for everyone if the rest of us were to know the particulars.
Thanks so much!
[-tv]
Tom VanderMeulen
"Grace O'Malley"
Cape Dory 27, #257
Monroe, MI
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Thursday, February 13, 2020
Re: [electricboats] 15 KW DC l electric conversikon
Thanks, Michael and Larry ...
Fish Paper...? I had to look it up! But having done so, I'm not clear why one would wrap a prismatic cell in it. Metal, cylindrical cells, maybe, but the CALB prismatics I'm using are cased in plastic which seems to obviate the need for more insulation between the cells restrained within a box. I don't see any harm in it, but what's the benefit. Thinking about Larry's application, wouldn't wrapping the cylindrical cells in Fish paper, and also shrink-wrapping the bank of cells tend to encourage even greater heat retention? The voltages, charging rates, and discharge rates aboard a sailboat aren't even close to those of an electric car, and it may be that the amount of heat generated during charging will never rise to a hazardous point. That appears to be Larry's experience.
Maybe this is topic for a separate discussion item: does anyone have an experience aboard a sailboat where their batteries overheated during charging or discharging while running?
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Re: [electricboats] 15 KW DC l electric conversikon
Thank you for the fish paper idea. I will try that on my next project. I think isolating cells by wrapping individually with paper to keep cells from touching before shrink wrap adds a bit of insurance to any kind of jarring that could happen when chop , waves or rolling occurs.
Best regards,
Larry Schmitz
On Wednesday, February 12, 2020, 8:13 PM, Michael Ryan <mryanqld@gmail.com> wrote:
Hi Very interesting and informative topic of assembly of marine battery packs. I have a 48 volt 240AH pack comprising 16 cells. The manufacturer/supplier of my LiFePo4 Himax cells advised me to place fish paper between the cells and also underneath the cells. Fish paper was not available in in Australia and after a bit of research I came across a similar product called Pressphan Transformer Paper. I brought a roll it was not expensive and cut it up to pack between the cells as advised. I assume it is to prevent the cell rubbing together and shorting out. Shrink wrapping sounds like a great idea, I have space in my battery encloure to allow for shrinkwrap.I may have to wrap groups of four cells as each cell weighs 5kg making four 20kg packs which would be manageable. Has anybody else heard of Fish Paper and what are any comments on this requirement by my battery manufacturer/supplier.On Wed, Feb 12, 2020 at 5:11 AM THOMAS VANDERMEULEN <tvinypsi@gmail.com> wrote:This is a terrific link, Walter ... thanks so much! I can definitely think of applications for these in several places within the total propulsion system. There are several junction and instrument boxes that would benefit from venting with these (or similar also offered on this website).
Cheers!
[-tv]--Kind regards Mick 0414 264 312
Wednesday, February 12, 2020
Re: [electricboats] 15 KW DC l electric conversikon
Hi Very interesting and informative topic of assembly of marine battery packs. I have a 48 volt 240AH pack comprising 16 cells. The manufacturer/supplier of my LiFePo4 Himax cells advised me to place fish paper between the cells and also underneath the cells. Fish paper was not available in in Australia and after a bit of research I came across a similar product called Pressphan Transformer Paper. I brought a roll it was not expensive and cut it up to pack between the cells as advised. I assume it is to prevent the cell rubbing together and shorting out. Shrink wrapping sounds like a great idea, I have space in my battery encloure to allow for shrinkwrap.I may have to wrap groups of four cells as each cell weighs 5kg making four 20kg packs which would be manageable. Has anybody else heard of Fish Paper and what are any comments on this requirement by my battery manufacturer/supplier.
On Wed, Feb 12, 2020 at 5:11 AM THOMAS VANDERMEULEN <tvinypsi@gmail.com> wrote:
This is a terrific link, Walter ... thanks so much! I can definitely think of applications for these in several places within the total propulsion system. There are several junction and instrument boxes that would benefit from venting with these (or similar also offered on this website).
Cheers!
[-tv]
Kind regards Mick 0414 264 312
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