New Octopus tariff for solar and battery users - Octopus Flux

EcoScruples

I believe you would yes as you can't have both SEG and FIT at the same time.
Mostly it'll be better to keep your FIT unless you were a very late adopter and only get a small price per kw made.

Ron-ski

EcoScruples said:

I believe you would yes as you can't have both SEG and FIT at the same time.
Mostly it'll be better to keep your FIT unless you were a very late adopter and only get a small price per kw made.

That's incorrect, you can keep the FIT generation payment, and change the FIT export payment over to normal export payments. The deemed export is peanuts, rarely pays to keep it. I know, I've done it.

Edit:

May export

EcoScruples

I stand corrected 

superuser19375

Morning All,

as I venture further into the renewable journey, i think i'm going to need some advice on moving forward to get the best use out of my system.

I have at 3.585kwp solar system installed (about 5 years).  I'm getting a Tesla Powerwall 2 installed this thursday.  I currently have the Octopus Agile tariff.

I switched my FiT from British Gas to Octopus and at the same time, applied for the Flux tariff, I dont have an export meter, so am waiting for that to process.  As i didn't fully understand at the time, i went for the flat rate 15p/kw export instead of flexible rate - if someone can highlight the pro's and cons of that, or should i change??

In september, i'm also getting an air source heat pump installed so that i can remove gas from the house and be totally.

Any pointers or advice would be appreciated

 

pete-20-11

When you are on flux you have to have flux export to go with it - it's a combined import and export tariff.

There's also intelligent flux which according to a recent octopus tweet will soon support Tesla power wall - not sure which models though.

You might find flux or intelligent flux works well for the summer, but as winter approaches, something like cosy might be better due to the heat pumps. 

It's hard to say exactly what tariff is best when there's multiple variables! If you have an electric car it gets even more confusing! But at that stage I guess maybe go or intelligent go if compatible.

There's some videos on YouTube which cover off different tariffs and comparisons, look for Tim and Kat's Green Walk, plus Gary does Solar. 

sln8458

Ron-ski said:

May export

  If I am understanding this correct (the main priciple)

You are importing/charging batteries via overning cheap rate/solar, the exporting (including discharge battery) at the 2 higher rates, thus maximising income.

Battery size is not related to solar capacity as you are charging overnight at cheap rate.

Sorry, but I am a novice at this just like Pete-20-11

Ron-ski

Yes that's the basic principle, but I have 8kW inverter and 29kWh of batteries, which means I can charge or discharge at 8kW if I want to. I also have 8.74kWp of panels (more to be added soon).

sln8458

Ron-ski said:

Yes that's the basic principle, but I have 8kW inverter and 29kWh of batteries, which means I can charge or discharge at 8kW if I want to. I also have 8.74kWp of panels (more to be added soon).

So the inverter controlling the batteries (charge/discharge) is the KEY item.

Ron-ski

Well, without an inverter you're not going to turn DC battery power into 240v AC, so yes an inverter is a key item.

You can get what are called AC connected batteries, these have a built in inverter, but my Victron setup uses a DC connected battery.

sln8458

Ron-ski said:

Well, without an inverter you're not going to turn DC battery power into 240v AC, so yes an inverter is a key item.

You can get what are called AC connected batteries, these have a built in inverter, but my Victron setup uses a DC connected battery.

What I meant was that the size of the inverter, whether it be a 5Kw or 8Kw (as in your case) controls the charging/discharging rate.

And hence if the 'cheap' rate is only for 3 hours & the inverter is 5Kw, that suggests a 15Kw battery would be the 'optimal' size

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I have looked at the possibility of an AC coupled inverter/charger, but the hybrid type appears to offer greater flexibility in that I could add the Hybrid inverter + battery(s) and then add additional solar panels at a later date, conneted to the hybrid inverter.