Chris Pearson:

I don't think that I have seen this in here before, but these batteries came up in a motoring forum.


The claim to charge an EV all the way in 5 min seems to be entirely spurious - all that they have managed so far is a moped, but even if the batteries existed, how would they be charged?


Here is my back-of-a-fag-packet calculation. An average EV will do 4 - 5 miles per kWh; let's be conservative and say 4. So with a range of 300 miles between charges, that requires 75 kWh. Delivered over 1/12 hour that requires 900 kW. So in round terms, that is one 1 MVA transformer per EVCP. Could be useful on a motorway, but I cannot see the point elsewhere. Even then, very few journeys in UK are over 300 miles. Both Edinburgh and Land's End are closer to Birmingham than that.


900 kW at 48 V DC is almost 20,000 amps. What sort of connexion is envisaged?

Regardless of the battery voltage, Mode 4 (DC rapids) charge at up to 500 V DC, or even, using a CCS2 connector, up to 1000 V DC. Current delivery us up to 400 A.


So the sums look a little better now, at least for the vehicle to EV charging equipment connection ...


Yes, you are right MW range transformers are required for this kind of kit.


Coming soon to a filling station near you?

Chris Pearson:

I don't think that I have seen this in here before, but these batteries came up in a motoring forum.


The claim to charge an EV all the way in 5 min seems to be entirely spurious - all that they have managed so far is a moped, but even if the batteries existed, how would they be charged?


Here is my back-of-a-fag-packet calculation. An average EV will do 4 - 5 miles per kWh; let's be conservative and say 4. So with a range of 300 miles between charges, that requires 75 kWh. Delivered over 1/12 hour that requires 900 kW. So in round terms, that is one 1 MVA transformer per EVCP. Could be useful on a motorway, but I cannot see the point elsewhere. Even then, very few journeys in UK are over 300 miles. Both Edinburgh and Land's End are closer to Birmingham than that.


900 kW at 48 V DC is almost 20,000 amps. What sort of connexion is envisaged?

Regardless of the battery voltage, Mode 4 (DC rapids) charge at up to 500 V DC, or even, using a CCS2 connector, up to 1000 V DC. Current delivery us up to 400 A.


So the sums look a little better now, at least for the vehicle to EV charging equipment connection ...


Yes, you are right MW range transformers are required for this kind of kit.


Coming soon to a filling station near you?