Electric Tariff best for Solar and ASHP

[Ambaz79]

Hello

 

We have a 8Kwh Mitsubishi Ecodan HP and 12Kwh of Solar on the roof.  Plan in the next 6 months would be to add a battery storage solution once we have some figures on how much we are actually generating/using/selling.  Also no Electric car yet but looking to buy one in Jan 2024.

 

I am currently with EDF of an out of contract plan so need to switch soon.  Looking online and octopus seem to be the only ones I can find that have plans for ASHP or Solar.  Is there anyone else that offers plans if you have both? 

 

Or for now do we need to either pick the ASHP and find the best plan for this? or solar and best plan for that? 

 

Bit of a minefield, any help welcome!

[SteamyTea]

First things first.

An ASHP and PV are rated by power, the kW.

You buy electrical energy by the kWh.

 

As for the best tariff, hard to say.

Do you know the amount of energy your ASHP has consumed, the kWhs, and what your PV has produced, kWhs again.

Do you also know the shortest amount of time you can run the ASHP for to get a day's worth of energy into the house, I am assuming you have UFH in a concrete slab.

What is your DHW usage.

[ReedRichards]

In summer you won't be using the ASHP much so it's likely you'll have lots of spare electricity to export so you need a good export rate.  In winter the ASHP will gobble up any solar power you generate, probably without making much of a dent on what you import.  So you need a tariff that gives you a low import price for most or all of the day because an ASHP typically runs for long hours.  Good luck with that, cheap imports and a good price for your exports, the two rarely go together.  

[sharpener]

AFAICS if you have an EV  you can combine these two tariffs Octopus Intelligent (which is a better bet than their HP tariff Cosy if you don't need the afternoon boost)

 

 

with their export rate Octopus Outgoiing which pays 15p/unit for exports and will even allow you to arbitrage between the two using your battery. Check the actual rates for your particular postcode though.

 

 

 

Edited September 15, 2023 by sharpener

[JoeBano]

I’m on octopus agile it’s fairly cheap average 22p/kWh all day but between 4pm-7pm can be expensive. If got battery storage that could work well in the expensive slot. Not sure how the solar export works on that tariff, you’ll have to do some digging.

Edited September 16, 2023 by JoeBano
Correcting my mistake

[JohnMo]

2 minutes ago, JoeBano said:

Not sure how the solar import works

Is import or export? For export you can be agile export or fixed price. Import if you have a battery would be direct to battery, they wouldn't know or care about it. Even without a battery you would be self consuming or exporting 

[JoeBano]

I meant export just corrected mistake.

 

[JohnMo]

So agile has two export tariffs, an agile type and a fixed cost type.