Evaluate offer, photovoltaic system technology

Here is an example - our electricity price today (hourly variable):



Solar yield is rather poor today – but a lot of wind. Difference 15 cents. Currently, the washing machine and dishwasher are running. Why not fully charge the home battery from the grid now and avoid the 31 cents this evening.

By the way, the net price is currently 0 cents – the 16 cents are purely the surcharges (taxes, grid, etc.)

May I ask which provider you get the hourly variable rate from? We are also thinking about doing that.

Use Tibber. Already since the launch in DE. Never any problems (moved several times). Top support. You just have to check if you can plug the Tibber Pulse into your electricity meter - only then will you get hourly rates.

Use Tibber. Already since the start in DE. Never had problems (moved several times). Great support. You just have to check if you can plug the Tibber Pulse onto your electricity meter - only then do you get hourly rates

Yes, the Pulse fits on it. But I don’t know if they get the billing right, because we have a boundary meter. Currently we are with Bürgerwerke and my sister reports major problems with the billing. Apparently, they don’t get that you have to subtract the meter for HS from the meter for total consumption to get the heating electricity. It’s pretty simple, but they have been waiting for a correct bill for 2 years. We had that provider before, and now we have a contract with them again. But if they don’t figure it out, I’m already thinking of switching to Tibber. However, I doubt the billing for heating electricity will be easier if I pay household electricity separately with another provider.

(...)
I also find the prices still okay, although somewhat high. But still cheaper than comparable fuel. You’re just back on the road quickly. At home, I charge almost for free, but it takes longer.

So, with the usual electric car speed of 120 km/h on the highway, I drive my Seat Leon ST 150HP diesel at 5l/100km, or less.
5l of diesel currently costs just under 9 EUR.
What would a comparable electric car consume at 120 km/h on the highway? 20 kWh/100km? That costs 10 EUR at a DC fast charger (50 cents/kWh).

Sure, diesel costs more in maintenance because of taxes, servicing, etc. But for that, an electric car is more expensive and you take on the risk of the battery.
As I said, I once looked at the “maintenance instructions” that VW gives for the ID.4 so that you “use the battery correctly.” That’s all pretty vaguely phrased — if the manufacturer wants, they can always find a reason to eventually reject the 8-year warranty.

And it gets especially funny when you buy a used electric car. If you don’t have access to the long-term memory, you have no idea how the previous owner treated the battery... maybe it was used as storage and was fully discharged 3 times a day?

As a company car or new lease where I don’t have to worry about anything, okay. But a 5-year-old used one? I’m not so sure...

What would a comparable electric car consume at 120 km/h on the highway? 20 kWh/100km?

No, more like 13-15. I drive the MG at an average of about 18 on the highway, and I don't have an eco mode activated. Someone who regularly charges DC wouldn't pay 60 cents either. There are better deals. 60 cents is currently the most expensive rate at enbw if you charge at third-party stations and have no subscription. If you charge without a subscription at your own stations, you're already at 51 cents. And if you regularly commute and charge DC, you would sign a tariff where the total cost per kWh easily starts with a 4.

Hello,

If you should fully charge and discharge a 7kWh every day for 10 years,
that's a maximum of 25MWh (which is unrealistically a lot, by the way ;-)). With acquisition costs of 5000€, you're already at 20 cents.
The difference you can make in your example is just 16 cents. So it's not worth it.

With the current prices, you're right. I also can't find any calculation model that would make a storage system worth it at the moment. But with rising electricity prices in the future, the situation looks different. So basically, I would describe a power storage system as a bet on future rising electricity prices. That's not unrealistic either. A 4% annual increase turns the current roughly 35 cents into 50 cents in 10 years. The only question is whether you'll still get electricity for 16 cents during the day then!?!?

In other words, these are all calculations with many unknowns, and I guess you just have to believe in your calculation. Whether it was correct, you'll only know in 20 years.

Best regards,

Andreas