Quote:
Originally Posted by vluvelin
2) how does it perform when installed FFWD where temperature exceeding 140F ???
How higher temperatures affect performance
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I asked Kathy.
She said it was ok to post it here.
Subject
Battery Temperature
Enquiry
I have been following the lithium battery developments for a long time and am interested in using one for my Experimental airplane.
There are several pictures floating around showing that one of your batteries is interchangeable with an odyssey PC680 battery which is typically mounted on the engine side of the firewall on may experimental airplanes including my own.
Your specifications show that the maximum operating temperature is 140 deg F.
I am quite certain that in many of these installations including my own, the actual temperature at the battery exceeds this temperature on a really hot day after the engine is shut down and there is no cooling air flowing through the engine bay.
Subject: RE: New submission from Contact Form
Dear Joel,
Thank you for the question. The operating temperature for a lead acid is 113 degrees Fahrenheit and the ETX680 is 140 degrees Fahrenheit but this is an operating temperature, do not attempt to charge the battery above this temperature. The storage temperature is 158 degree Fahreheit.
We do have a manual online that addresses these questions as well for your review.
http://earthxmotorsports.com/wp-cont...l_111017_K.pdf
Please let me know if you have further questions.
Sincerely,
Kathy Nicoson
EarthX Lithium Batteries
Subject: RE: New submission from Contact Form
Dear Kathy,
Thank you for the response! I have read the manual several times and I feel my question is still not answered unless I understand something wrong.
Maybe I should be educated on the definition of operating and charging?
Can we consider the following example?
The battery is installed in a location that gets above 140 deg F during operation. I understand that to be considered storage. However, in the same location installed on an airplane a pilot may opt to land for 10 minutes, fill the tanks with fuel, then start the engine. Let?s assume he doesn?t know how to get the fuel/air mixture correct on the first and second start attempts and finally after desperation gets his engine started but he used 70% of his battery charge in the process.
Now we have a battery installed in a location that is over 140 deg F due to the engine just being shut down from the previous operation AND the battery will automatically be making the alternator charge it. Would this not be considered CHARGING or do we still call this operating?
Please enlighten my weak mind.
Thanks Joel
Subject: RE: New submission from Contact Form
Dear Joel,
I had one of our engineers look this over and this is what he said:
?Operation? would be charging or discharging (current in or current out).
The main point is our battery should not be used in applications where the ?battery? temperature is over 140 deg F during charging or discharging. In your example below, would the battery temp (more specifically the cells inside the battery case) actually exceed 140 deg F in 10 minute ? most likely not. Are brief periods of time above 140 deg F ok ?. Sure, for 10-15 minutes.
But if you have measured your engine compartment and it exceeds 140 deg F for long periods of time, then it can?t be used in the engine compartment.?
Let us know if you need any further questions.
Sincerely,
Kathy Nicoson
EarthX Lithium Batteries
Global Sales Director
Subject: RE: New submission from Contact Form
Thanks Kathy!
Good information! Care if I share it on the Vans Airforce forum?
Subject: RE: New submission from Contact Form
Hi Joel,
Thank you for asking and of course you can. I already know I am going to receive a ton of responses asking more questions about this, which is fine, but the lead acid battery, which pilots have been using for decades, have a high temperature reading of only 113 deg F compared to the EarthX at 140 deg F just as a side note. The response from a lead acid company would have that if you measure your engine compartment above 113 def F, do not use it there.
It is a bit more complex in that it is the temperature of the inside of the battery or the cells in reality that should not exceed the 113 deg of a lead acid battery and 140 deg of a lithium battery. Much harder to measure. We have had a few fly with temperature monitors on the batteries and we have not had a report back of temperatures actually reaching this temperature but I am sure there are people who can.
Sincerely,
Kathy Nicoson
EarthX Lithium Batteries
Global Sales Director
Many don?t realize that the lead acid battery is only rated to 113 deg F as this information isn?t easily available whereas we post it. The temperature ratings are far better with a lithium battery than a lead acid, as the chemistry is very different so it is great to ask and post the questions.
Have a fantastic Friday!
Sincerely,
Kathy Nicoson
EarthX Lithium Batteries
Global Sales Director