On an instavolt charger the other day and it cut out after about 8 mins. Later tried at a BP charger and it wouldnt connect, tried again at the same site different charger different credit card, still nothing, got hpe wir 3 miles left. Charged over night on 240 ac and it worked OK, so i went out and trode DC again (twice) pn both occasions was only charging at 15kw. anyone have any ideas? or had similar problems