February

NikoV6
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Re: February

#31

Post by NikoV6 »

Thought we would put another PowerWall in, got a quote, £10,900 fitted! :o

Only paid £8995 for the full install with gateway last year, bonkers!

Can a DC battery system play nicely with the PowerWall?
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Fintray
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Re: February

#32

Post by Fintray »

NikoV6 wrote: Tue Feb 07, 2023 10:38 am Thought we would put another PowerWall in, got a quote, £10,900 fitted! :o

Only paid £8995 for the full install with gateway last year, bonkers!

Can a DC battery system play nicely with the PowerWall?
I have been looking at the same, and a DIY battery system could be had for much cheaper and with greater capacity.
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NikoV6
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Re: February

#33

Post by NikoV6 »

Fintray wrote: Tue Feb 07, 2023 10:49 am
NikoV6 wrote: Tue Feb 07, 2023 10:38 am Thought we would put another PowerWall in, got a quote, £10,900 fitted! :o

Only paid £8995 for the full install with gateway last year, bonkers!

Can a DC battery system play nicely with the PowerWall?
I have been looking at the same, and a DIY battery system could be had for much cheaper and with greater capacity.
Interesting! I would only need as storage, the PowerWall can do all the tricky house isolating thing if needed!

Don't want to hijack this thread, do you know if this is discussed in another thread?
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Fintray
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Re: February

#34

Post by Fintray »

I don't think this particular set up is being discussed on the forum.
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Joeboy
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Re: February

#35

Post by Joeboy »

Fintray wrote: Tue Feb 07, 2023 11:29 am I don't think this particular set up is being discussed on the forum.
Looks like a good proto thread Iain? Would be great to see it run.
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nowty
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Re: February

#36

Post by nowty »

The dumber the battery inverter is, the easier it is to add some DIY battery storage. I fear a Powerwall my be too clever for that and difficult to get to a suitable DC tap off point.
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Fintray
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Re: February

#37

Post by Fintray »

nowty wrote: Tue Feb 07, 2023 1:08 pm The dumber the battery inverter is, the easier it is to add some DIY battery storage. I fear a Powerwall my be too clever for that and difficult to get to a suitable DC tap off point.
The DC voltage of the Powerwall would also be too high for safely linking a suitable DIY battery.
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nowty
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Re: February

#38

Post by nowty »

Fintray wrote: Tue Feb 07, 2023 1:15 pm
nowty wrote: Tue Feb 07, 2023 1:08 pm The dumber the battery inverter is, the easier it is to add some DIY battery storage. I fear a Powerwall my be too clever for that and difficult to get to a suitable DC tap off point.
The DC voltage of the Powerwall would also be too high for safely linking a suitable DIY battery.
Spec says "Internal Battery DC Voltage 50V"
https://www.tesla.com/sites/default/fil ... _en_GB.pdf
16.9kW PV > 109MWh generated
Ripple 6.6kW Wind + 4.5kW PV > 25MWh generated
5 Other RE Coop's
105kWh EV storage
60kWh Home battery storage
40kWh Thermal storage
GSHP + A2A HP's
Rain water use > 510 m3
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Fintray
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Re: February

#39

Post by Fintray »

nowty wrote: Tue Feb 07, 2023 1:23 pm
Fintray wrote: Tue Feb 07, 2023 1:15 pm
nowty wrote: Tue Feb 07, 2023 1:08 pm The dumber the battery inverter is, the easier it is to add some DIY battery storage. I fear a Powerwall my be too clever for that and difficult to get to a suitable DC tap off point.
The DC voltage of the Powerwall would also be too high for safely linking a suitable DIY battery.
Spec says "Internal Battery DC Voltage 50V"
https://www.tesla.com/sites/default/fil ... _en_GB.pdf
Duh, I looked up the original Powerwall and that states 350-450v but that will be the dc voltage incoming!

Still wouldn't want to try linking into the Powerwall whilst still under warranty though.
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Moxi
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Re: February

#40

Post by Moxi »

Could you build a DIY battery to your own voltage spec and then use it to trickle feed the background load via a cheap and cheerful hybrid grid tie inverter and leave the heavy lifting to the power wall ? Effectively you are keeping the systems separate but have the advantage of extra storage

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