To the orignial question, the Zappi charger allows you to say how many Kwh you want it topped up by. It's a simple bit of maths but you just halve your desired percentage increase and that gives you how many Kwhs you need (e.g. 30% / 2 = 15kwh). For us we charge at 50% with 15 Kwh which brings it to about 80%.
I have a very basic “Old School” dumb unit that is about 6 years old.
I have a Wi-Fi relay installed, that works in conjunction with a App on my phone.
From this, I can conduct delayed charging that work with my cheaper rate off peak tariff.
I plug in the car early evening, then commence the charge after 10.00pm when the cheaper rate starts.
When starting the charge, the display in the dash panel of the car will show the percentage of rang remaining, then it will predict when the car will hit 100% fully charged.
A 32Amp 7 kw wall box is likely to add roughly about 25 miles of range, for each hour that the car is on charge.
From these figures, it is pretty easy to work out how long you need to charge, to hit your desired percentage required.
I can then set a desired time that I want the charge to STOP.
I have used this method for almost two years now and it gets me close to my required level of charge to suit my upcoming trips.
I will usually charge to achieve about 100 miles of range, that’s most of our weekly needs.
Then when the car reaches about 50 miles or remaining range, I will give it a similar top up.
If we have a longer journey to make, I will charge and balance through the night, ready for our long trip the following morning.
I have never run the remaining range down below 30 miles and the car has only rapid charged on about four occasions, for a quick splash and dash.
Over 99% of our charging is conducted from home.
We have covered almost 15,000 miles in nearly two year and three C19 lock downs.