Crazy Cat's Charger Challenge
What any EV battery charger should do!
Another excellent description of what a charger should be:
Phoenix EAA Charger Report
- Power factor correction (gets the most juice from a given outlet rating)
- Auto switches to 120 or 240 Volt input (universal input)
- Has selections for input current limit of 15,20,40,50 Amp circuits
plus another variable 0-50 setting for a standard circuit that might be
shared for example with a coke machine, refridgerator, etc... Different
input current presets should be selected automatically based on the
incoming line voltage to automatically take advantage of higher
current 240+ volt systems without any intervention from the user
beyond initial setup / programming. Ie. switching from a 120V
opportunity charge to a 240V supply shouldn't require any adjustments
by the user to obtain the maximum allowable power
level. (Automatic Input Power Level - AIPL - my term)
- Has some mechanism for balancing the charge of each battery in the pack.
- Fully automatic charge cycle
- Temperature compensation appropriate to the battery chemistry.
This needs to be integrated with charge
balancing since each battery will have slightly different temperatures.
- Timer capability for off peak charger and electric company time-of-use
EV charging rate compatibility
- Minimum power level of 2KW, ( 120V, 0.80 * 20 Amps = maximum power
available from 120V 20A circuit by code.
- Weight < 10 kg. ( 20 pounds )
- Volume < 16000 cm**3 ( 1000 in**3 )
- Cost the larger of < $1000 US. or < $0.50 / watt ( Anything available today under $500 is not a
bargain. They are not power factor corrected, and usually not automatic. )