Economics of charging at 7p and exporting at 15p

[Stinsy]

I'm not sure I subscribe to the idea of batteries having a limited number of cycles. Evidence points to temperature, calendar age, and deep discharging as being the key factors.

My stack is 5-years and probably a bit less than 2000 cycles old.

[AE-NMidlands]

I'm not sure I subscribe to the idea of batteries having a limited number of cycles. Evidence points to temperature, calendar age, and deep discharging as being the key factors.
My stack is 5-years and probably a bit less than 2000 cycles old.

Which might be why Givenergy feel able to offer a 12-year unlimited cycle guarantee... (with a 4% floor. The next one claims to be 100% useable, but maybe they have just made it bigger and hidden the floor)

[Stinsy]

I'm not sure I subscribe to the idea of batteries having a limited number of cycles. Evidence points to temperature, calendar age, and deep discharging as being the key factors.
My stack is 5-years and probably a bit less than 2000 cycles old.

Which might be why Givenergy feel able to offer a 12-year unlimited cycle guarantee... (with a 4% floor. The next one claims to be 100% useable, but maybe they have just made it bigger and hidden the floor)

There are a few batteries that claim to be OK discharged to 0%. However in reality they just report “0%” when they are really at 5% (or whatever).

[John_S]

Doing Stinsy's sums for my kit I get:

Capacity 16kWh
Useable capacity 16kWh
(EVE tell us things are rated at 100% cycles and there is no point leaving a bit at the ends on LFP - let's take that at face value even though we dn;t really know if it's true)
Cost to fill £1.12(although they've not had much of a workout yet, it being December).
Received from selling at 15p £2.40
Profit per day £1.28
Profit per year £467.20

The above calculation assumes that the charge discharge process is 100% efficient. You will need to allow up to 10-15% round trip losses. Say 2kWh or 30 p per day.

Also, there will be some self consumption.

[nowty]

On our holibobs, but nowty towers is currently making a small daily profit all by itself even in the deepest winter gloom with the import / export arbitrage.

No intervention from me at all, just set the inverter to export a min of 1kW for the 18hr peak slot and fully recharge during the 6 hours of cheapsot.

I’ve now been over a full year on the export tariff and looks like a circa £500 profit on a near all electric house with 2 EVs.

[AE-NMidlands]

Lisbon? Nice sunshine anyway. It's not too bad here at the moment, thin cloud and 500W off an array pointing 90 degrees away from the sun!

[Stinsy]

Here we go:

[Fintray]

It's negative cost* so that's the main thing.

*If you exclude PV panels, inverters, batteries and all the time we spend looking at the data!

[nowty]

£182.03 profit for last month, enough to buy 3 x 450W PV panels including delivery from City Plumbing or 4kWh worth of LFP cells including delivery from Fogstar.

Rinse and repeat.

[Joeboy]

£182.03 profit for last month, enough to buy 3 x 450W PV panels including delivery from City Plumbing or 4kWh worth of LFP cells including delivery from Fogstar.

Rinse and repeat.

That's an excellent result. We are £117 profit for the Month of April. It will be Mid June before we have paid off the £300 outlay for our 4 550's. Happy with that.