Ŵe have a Solar PV array of 4kw and 2 electric cars.I also recently had a disaster with my Rolec charger outside. It blew up and damaged a charging cable. Luckily it was inside the warranty period and I got my money back for it.So we now have a new charger called a Zappi. Here is the reason why we went for a Zappi charger.
Every kWh to charge my car cost me 12 pence.If I feed any surplus energy, that my house does not use, back into the grid I only get 1 pence back.So I am making a 11p profit if I feed that surplus energy into my car.That is the economics that the Zappi is build on.Even though it is called the “FEED-in Tariff” it is actually the worst named sound bite ever.
There are two parts to the Feed-in Tariff.One is for you generating power with your Solar PV array and another part for “feeding” that back into the grid.
Everything you “generate” you get 59 pence (highest part) irrespective of you using it in your house or “feeding” it back to the grid.The smallest part (only 1 pence) you get for putting it back into the grid.So it actually makes no sense at all to feed anything back to the grid but use it yourself.Of course you need to be at home to be able to do that.
However this is where Tesla Powerwalls and Ikea batteries come in.If you are not at home with your car feed the extra solar (surplus) into a battery or your hot water cylinder and you have hot water in the evening when you come home and have a “free”bath!
The makers (myenergi) of Zappi have a gadget for that called Eddi.
The diagram in the picture shows you how it works.
I have Zappi and Harvi here installed at home.I need Harvi because it is a wireless unit.My Zappi is installed a little bit away from the house ( on a brick pillar)so I could not get a cable for monitoring the house electric supply easily to it.But if it is installed in the garage or outside of the garage you don’t need Harvi.It Just gave me more flexibility.
You need an approved Zappi installer like the Phoenixworks.com to install it all for you though or to help you to find your bespoke solution.Search on YouTube for Zappi and Fully charged and other UK based youtubers have reviewed the Zappi.It is a UK based company who have crowd funded this invention to bring it to market.