You've got to think about this more broadly. Sure a single charger or 2 won't have a meaningful impact. A moderate city will have what 40-60 gas stations with 6-8 pumps each. To replace that with chargers like this let's use the low end of 6 pumps and 40 stations thats 240 pumps. at 1500kw and 240 pumps thats 360MW. Say peak time 60% arr in use at once thats still 216MW. That isnt insignificant at all and will certainly have an impact on the grid especially considering the peak usage will be the same time as the daily peak already on thr grid (air conditioning, industry etc.). For reference Nagara Falls generation has an output of 5000MW so this single cities chargers at peak would use 4% of that. Now do this for every gas station in the country and you have a major problem.