Hillhater
100 TW
OK,… so you explain in simple terms how a controller can output more power than the battery is able to input to it ..?
..with a few less smart ass comments please !
Tesla owners in deep freeze discover the cold, hard truth about EVs
- Thread starter calab
- Start date
..with a few less smart ass comments please !
JackFlorey
100 kW
From the wheels. The inverter drives the motors with an intentionally "bad" field, which results in heat generation but little to no motive power. The malformed field generates a racket; apparently it's not 100% non-motive, so the motors/inverters make a lot of noise while this going on. The ~4kW of heat thus generated is used as a heat source for the "cold" side of the heat pump, and the battery becomes the "warm" side.
Hillhater
100 TW
No, i am simply asking you to explain your statement,….
“The controller can increase it at the expense of ever dwindling efficiency.”.……refering to the battery output power.
Your reply (page 3) did not even mention a controller, let alone how it mightperform that power increase.
All you mentioned was how tesla batteries ..and others ..discharge under load and at low temps.
since we already know that the “frozen” battery discharge is fully limited by low temp ,…how then can a controller make the battery produce more power ?
circuitsmith
10 W
- Joined
- Feb 27, 2008
- Messages
- 81
Think of the battery in the simplest terms, as an ideal voltage source in series with a resistor.
And similarly think of the load as just a resistor as well.
You'd get maximum power in the load when its resistance equals the internal resistance of the battery.
Impedance matching - Wikipedia
Bad things would happen in a hurry with a lithium battery if this were done in real life; thus the load resistance is always considerably higher.
But there's always "room" for the controller to reduce its effective load resistance, physical (thermal) consequences not withstanding, to extract more power from the battery.
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