by donald (Posted Thu, 28 Nov 2013 00:28:50 GMT)
It is not too illogical to drive 60/70 if you are heading for a QC because it will charge quicker than you use power.
But heading for an L2, surely you should simply slow down!? It takes longer to charge up the extra power you use than to simply slow down and take longer to get there!
Taking the DOE figures generously, call it 4.5M/kWh at 50 and 3M/kWh at 70.
So if you drive, say, 20 miles you use;
4.45kWh in 24 minutes at 50, or
6.67kWh in 17 minutes at 70.
Question is, how much longer does it now take to recharge the extra 2.2kWh used. At 6.6kW, that'd be 20 minutes.
So at 70 takes 37 minutes, and at 50 takes 24 minutes. (Distance actually traveled need not be 20 miles. The figures would all change proportionately.)
Of course, if you are already planning to stop for 20 extra minutes, then that complicates the calculation, but bottom line is if you want to go further, drive slower.
Graffi wrote:
We took a 115 mile each way road trip last month in our new leaf. One DC Quick charge and two L2 charges going, and same in reverse. .... Going I tried to keep it at 60mph and on the return more like 70mph.
It is not too illogical to drive 60/70 if you are heading for a QC because it will charge quicker than you use power.
But heading for an L2, surely you should simply slow down!? It takes longer to charge up the extra power you use than to simply slow down and take longer to get there!
Taking the DOE figures generously, call it 4.5M/kWh at 50 and 3M/kWh at 70.
So if you drive, say, 20 miles you use;
4.45kWh in 24 minutes at 50, or
6.67kWh in 17 minutes at 70.
Question is, how much longer does it now take to recharge the extra 2.2kWh used. At 6.6kW, that'd be 20 minutes.
So at 70 takes 37 minutes, and at 50 takes 24 minutes. (Distance actually traveled need not be 20 miles. The figures would all change proportionately.)
Of course, if you are already planning to stop for 20 extra minutes, then that complicates the calculation, but bottom line is if you want to go further, drive slower.