On-grid domestic battery storage

Petriix

arty688 said:

Yes, watched yesterday thinking of unsubscribing , even on my most optimistic man maths day my figures are nowhere near. I just wonder how much Givenergy paid him or maybe he is just stupid?

My man-maths are really starting to add up. I've got a spreadsheet with historical generation data which I have adapted to calculate possible savings from various sized batteries.

At my previous rate of 12.6p with Symbio it was around a 14 year payback best case. At 17.6p with Neon Reef it's around 9 years. At Eon's 20.8p it's close to 7 years. With the possible prices in April it could be under 5 years.

The sweet spot seems to be 7.2kWh of pylontechs with a Solis inverter for around £3k

orrery

Spies said:

... Octopus Go isn't available any longer without proving EV ownership.

Odd, I'm in the process of switching over to Go, and they haven't even asked me if I have an EV.

Spies

orrery said:

Spies said:

... Octopus Go isn't available any longer without proving EV ownership.

Odd, I'm in the process of switching over to Go, and they haven't even asked me if I have an EV.

Well, I wouldn't base battery payback calcualtions on something that could be taken away at any point as it states in the terms that you should own an EV.

arty688

Petriix said:

arty688 said:

Yes, watched yesterday thinking of unsubscribing , even on my most optimistic man maths day my figures are nowhere near. I just wonder how much Givenergy paid him or maybe he is just stupid?

My man-maths are really starting to add up. I've got a spreadsheet with historical generation data which I have adapted to calculate possible savings from various sized batteries.

At my previous rate of 12.6p with Symbio it was around a 14 year payback best case. At 17.6p with Neon Reef it's around 9 years. At Eon's 20.8p it's close to 7 years. With the possible prices in April it could be under 5 years.

The sweet spot seems to be 7.2kWh of pylontechs with a Solis inverter for around £3k

I'm guessing that's with solar ? The EVM video is without
Did you included losses and that the 7.2kwh is 6.5kwh useable which will reduce over time?
Also £3K seems cheap if you are including install

EVandPV

arty688 said:

Petriix said:

arty688 said:

Yes, watched yesterday thinking of unsubscribing , even on my most optimistic man maths day my figures are nowhere near. I just wonder how much Givenergy paid him or maybe he is just stupid?

My man-maths are really starting to add up. I've got a spreadsheet with historical generation data which I have adapted to calculate possible savings from various sized batteries.

At my previous rate of 12.6p with Symbio it was around a 14 year payback best case. At 17.6p with Neon Reef it's around 9 years. At Eon's 20.8p it's close to 7 years. With the possible prices in April it could be under 5 years.

The sweet spot seems to be 7.2kWh of pylontechs with a Solis inverter for around £3k

I'm guessing that's with solar ? The EVM video is without
Did you included losses and that the 7.2kwh is 6.5kwh useable which will reduce over time?
Also £3K seems cheap if you are including install

That's pretty much what I paid for a Lux inverter and 7.2kwh Pylontechs, including installation.
That said, Pylontechs have gone up in price a little since we got ours in 2019.

arty688

Oh and not forgetting that the excess solar is worth 5P export.

arty688

EVandPV said:

arty688 said:

Petriix said:

arty688 said:

Yes, watched yesterday thinking of unsubscribing , even on my most optimistic man maths day my figures are nowhere near. I just wonder how much Givenergy paid him or maybe he is just stupid?

My man-maths are really starting to add up. I've got a spreadsheet with historical generation data which I have adapted to calculate possible savings from various sized batteries.

At my previous rate of 12.6p with Symbio it was around a 14 year payback best case. At 17.6p with Neon Reef it's around 9 years. At Eon's 20.8p it's close to 7 years. With the possible prices in April it could be under 5 years.

The sweet spot seems to be 7.2kWh of pylontechs with a Solis inverter for around £3k

I'm guessing that's with solar ? The EVM video is without
Did you included losses and that the 7.2kwh is 6.5kwh useable which will reduce over time?
Also £3K seems cheap if you are including install

That's pretty much what I paid for a Lux inverter and 7.2kwh Pylontechs, including installation.
That said, Pylontechs have gone up in price a little since we got ours in 2019.

I would say the kit is about £2.5k + 20% vat not sure how much the install would be but I guess that price has gone up to.

lisyloo

arty688 said:

Oh and not forgetting that the excess solar is worth 5P export.

Which it still will be if it's "deemed" right?

arty688

What I was saying was if you unit price is say 20p and you have generated 10kwh excess solar if you had a battery you could store it and use it and it would be worth £2 but take 10% for losses etc so £1.80 the take away the 50p you would have got anyway (export) and the battery has saved yo £1.30. Not the £2 you might think.

Petriix

arty688 said:

Petriix said:

arty688 said:

Yes, watched yesterday thinking of unsubscribing , even on my most optimistic man maths day my figures are nowhere near. I just wonder how much Givenergy paid him or maybe he is just stupid?

My man-maths are really starting to add up. I've got a spreadsheet with historical generation data which I have adapted to calculate possible savings from various sized batteries.

At my previous rate of 12.6p with Symbio it was around a 14 year payback best case. At 17.6p with Neon Reef it's around 9 years. At Eon's 20.8p it's close to 7 years. With the possible prices in April it could be under 5 years.

The sweet spot seems to be 7.2kWh of pylontechs with a Solis inverter for around £3k

I'm guessing that's with solar ? The EVM video is without
Did you included losses and that the 7.2kwh is 6.5kwh useable which will reduce over time?
Also £3K seems cheap if you are including install

Yes, calculations include 80% round trip efficiency and 80% depth of discharge. Fortunately I'm on deemed exports so no loss there.

I'm looking at £2800 for the materials, then self-install the bulk of it and get a friendly sparky to make the final connection to the isolator I already have connected to the CU.

The numbers are still borderline at current prices ~ £300-400 savings per year. But with more rises in the spring it's going to be a no-brainer.