Hi,
With the VAT rate now nil on battery storage, I think a home battery may make now (almost!) sense for our household.
I’m leaning towards the Powerwall. I was considering the Givenergy AlO, but after spending some time on the Givenergy forums I’m concerned by their long-standing SOC / BMS issues.
We have 4kW of PV, a Zappi, an Eddi and an air source heat pump.
My first goal is to maximise self-consumption of solar and minimise overall electricity costs, while being kind to the grid.
As we are current on FITs payments for solar, I haven’t yet done the maths to work out whether switching to an Octopus export tariff to replace the deemed export is worth the risk. We have about 11 years left on FITs.
In summer, I think we’ll have plenty of solar to live off self-consumption.
In winter, the ASHP will often use more than one Powerwall can provide just charging once per day.
We are currently on the Octopus Agile tariff as this is cheapest for our current energy usage; the heat pump needs to run at various times through the day. We can avoid too much draw during the peak evening period on Agile.
I’m interested to learn from other Powerwall owners how you use the self consumption and time of use tariffs, in conjunction with plans like Agile, Go, Intelligent etc.
Do you use self-consumption mode in summer and time of use mode in winter, or does time of use work satisfactorily all year round?
How do you prioritise Powerwall and car charging?
I have a decent Home Assistant setup and am not averse to some automation, but a bit unsure what Fleet API will mean for third party access and so don’t know if I can rely on clever automations to nudge Powerwall behaviour long term.
Thank you.
With the VAT rate now nil on battery storage, I think a home battery may make now (almost!) sense for our household.
I’m leaning towards the Powerwall. I was considering the Givenergy AlO, but after spending some time on the Givenergy forums I’m concerned by their long-standing SOC / BMS issues.
We have 4kW of PV, a Zappi, an Eddi and an air source heat pump.
My first goal is to maximise self-consumption of solar and minimise overall electricity costs, while being kind to the grid.
As we are current on FITs payments for solar, I haven’t yet done the maths to work out whether switching to an Octopus export tariff to replace the deemed export is worth the risk. We have about 11 years left on FITs.
In summer, I think we’ll have plenty of solar to live off self-consumption.
In winter, the ASHP will often use more than one Powerwall can provide just charging once per day.
We are currently on the Octopus Agile tariff as this is cheapest for our current energy usage; the heat pump needs to run at various times through the day. We can avoid too much draw during the peak evening period on Agile.
I’m interested to learn from other Powerwall owners how you use the self consumption and time of use tariffs, in conjunction with plans like Agile, Go, Intelligent etc.
Do you use self-consumption mode in summer and time of use mode in winter, or does time of use work satisfactorily all year round?
How do you prioritise Powerwall and car charging?
I have a decent Home Assistant setup and am not averse to some automation, but a bit unsure what Fleet API will mean for third party access and so don’t know if I can rely on clever automations to nudge Powerwall behaviour long term.
Thank you.
Last edited: