RE: BID15 Nov 2024 09:48
David you obviously don't have solar and a battery setup.
That is not how it works.
I will give you the basics for a 5kw solar array with a 10kw battery with a 55 KW car battery.
First of all the solar array in the summer will generate 25-33 KW a day.
During the winter around 6-8 KW a day.
These are not made up figures they are what I am getting.
I have intelligent immersion and heating and low energy device's.
Not all but as they come to end of life and I replace them, energy use, is one of the criteria I select when purchasing.
So in the summer I use around 4-6 KW a day, in the winter around 8-10 KW a day.
No one has a 3 kw kettle that's insane.
Now if in theory you used your car as a backup battery, then you would charge it between 2-6 am with cheap electricity at under 10 pence per kilowatt.
Then between 4-7 pm sell it back to the grid at 26 pence per kilowatt.
This is where the inverter size and your national grid certificate about how much you can export at any one time.
So you can have a fully charged car run your house with no interpretation and all for free and make money.
The only downside is solar tarrifs on the daily rate are quite high .
Mine is around 56 pence a day, but this pays for my export and export contract.
As long as the car battery doesn't charge to more than 80% and depth of discharge is not less than 20%, then battery life for car and dedicated battery is going to be around 20 years.
These settings can be set with the software that controls the intelligent inverter.
I also use an iboost, this is a great device, that once my battery is charged to 80%, it diverts my power to my emersion heater, so I always have hot water, as my intelligent immersion heater can be heating water for 30 minutes a day, in 2 or 3 minute bursts, and provides enough hot water.
The point is yes with an electric car 55kw and 5kw solar array and a ten kilowatt battery you can run your house and car for free during the summer and winter.
It's just in the winter you don't make as much money, and you need to import more cheap electricity between 2-6 am and sell it back for 26 pence the following day.
That's how it works, however there is more to it than that, but I have only given you the basics.
A lot of contracts out there can respond to demand, for example you can get up to £2 a kilowatt when selling and buy for 7 pence a kilowatt.
But those are extremes, as you you can set export and import limits, and if you get a text, saying the grid requires more energy between certain hours, you can go into your app and switch to export and get the agreed price.
In short I don't do this, as it overcomplicates things but I do enough to get free energy for my house throughout the year.
I don't have an electric car, and wouldn't hook it up to the house, but when I come to buy one, I will get a solar car port, this is a standalone device, and will only charge the car, therefore not invalidating my national grid certificate.