4 ms·

Will this work when its -30F?

by eggoa 11y ago

jngreenlee 11y ago
http://www.mpoweruk.com/lithiumS.htm http://www.mpoweruk.com/lithiumS.htm Stricter regulations on shipping methods than for other cell chemistries. Degrades at high temperatures. However, for Lithium Iron Phosphate LiFePO4: "Lithium phosphate cells are incombustible in the event of mishandling during charge or discharge, they are more stable under overcharge or short circuit conditions and they can withstand high temperatures without decomposing."
disposition2 11y ago
I would be interested in this and high temperatures as well, few things perform as expected here in AZ when it gets above 110F
fn42 11y ago
Not exactly -30 but I know this guy had some success with off the shelf caps: https://www.youtube.com/watch?v=GUXM1XuLUIs https://www.youtube.com/watch?v=GUXM1XuLUIs There's a few other vids on this topic if you search through the channel
daniel-levin 11y ago
>> Rated for -30°C to +50°C [1] -22F ~ -30C [1] http://www.getohm.com/ http://www.getohm.com/
- chrisBob 11y ago
  Is that expected to be sufficient? Typical automotive electrical components are rated over -40C to 85 or 105C. I think the engine compartment is typically hotter than 50C when a car is running. This might be more suitable to a car that mounts the battery remotely: I have seen BMWs with the battery in the trunk.
  - blueintegral 11y ago
    We're being conservative with the temperature rating for now. The components are rated better than that, but we're still running cycle tests in our temp chamber and waiting to get the system tested by an outside lab.
  - beloch 11y ago
    It's not sufficient in Canada. We regularly see temperatures below 30 C. Hopefully they can push it lower, because a battery that quits when it's cold out is pretty much worthless up here.
conjecTech 11y ago
The capacitors are fairly immune to temperature variation since they don't store energy using a chemical reaction, and we can also dynamically adjust the standing voltage of the caps to increase power in cold conditions. We believe so, but don't want to say it until we can verify for sure. Our temp chamber unfortunately has trouble pushing anything south of -20F and it's a bit hard to find weather that cold in August.

Will this work when its -30F?

by eggoa 11y ago

Will this work when its -30F?

http://www.mpoweruk.com/lithiumS.htm http://www.mpoweruk.com/lithiumS.htm Stricter regulations on shipping methods than for other cell chemistries. Degrades at high temperatures. However, for Lithium Iron Phosphate LiFePO4: "Lithium phosphate cells are incombustible in the event of mishandling during charge or discharge, they are more stable under overcharge or short circuit conditions and they can withstand high temperatures without decomposing."

disposition2 11y ago

I would be interested in this and high temperatures as well, few things perform as expected here in AZ when it gets above 110F

fn42 11y ago

Not exactly -30 but I know this guy had some success with off the shelf caps: https://www.youtube.com/watch?v=GUXM1XuLUIs https://www.youtube.com/watch?v=GUXM1XuLUIs There's a few other vids on this topic if you search through the channel

daniel-levin 11y ago

>> Rated for -30°C to +50°C [1] -22F ~ -30C [1] http://www.getohm.com/ http://www.getohm.com/

chrisBob 11y ago
Is that expected to be sufficient? Typical automotive electrical components are rated over -40C to 85 or 105C. I think the engine compartment is typically hotter than 50C when a car is running. This might be more suitable to a car that mounts the battery remotely: I have seen BMWs with the battery in the trunk.
- blueintegral 11y ago
  We're being conservative with the temperature rating for now. The components are rated better than that, but we're still running cycle tests in our temp chamber and waiting to get the system tested by an outside lab.
- beloch 11y ago
  It's not sufficient in Canada. We regularly see temperatures below 30 C. Hopefully they can push it lower, because a battery that quits when it's cold out is pretty much worthless up here.

conjecTech 11y ago

The capacitors are fairly immune to temperature variation since they don't store energy using a chemical reaction, and we can also dynamically adjust the standing voltage of the caps to increase power in cold conditions. We believe so, but don't want to say it until we can verify for sure. Our temp chamber unfortunately has trouble pushing anything south of -20F and it's a bit hard to find weather that cold in August.