52 minutes ago
I did some measurements by clamp meter for my car which is V90 -17 and it takes about 16A when ignition on and lights off. So I would recommend charger which can give 20A at least. I use Biltema 25A smart charger and it can keep voltage high enough as long as needed. I'm not sure is this charger available in your country, but it is really good value for the money. With 5A charger you really need to hurry to get programming done before voltage drops below 12V. Even with good battery there is not much time.