Page 1 of 1
Adding additional battery to Tesla Powerwall setup
Posted: Wed Oct 25, 2023 8:10 am
by NikoV6
Being quoted £9K for an additional Powerwall which is unacceptable!
So, looking at other options (if there are any that will play nice with Tesla!)
Estimate is we need an additional 10 - 15kWh to see us stay on overnight rate for all of the year.
We have 10kW solar split between three strings. Thought was to split one off to feed another battery?
https://www.itstechnologies.shop/collec ... octopus-go
I cant make out if this needs an inverter too?
Other options please?
Re: Adding additional battery to Tesla Powerwall setup
Posted: Wed Oct 25, 2023 9:01 am
by Fintray
NikoV6 wrote: ↑Wed Oct 25, 2023 8:10 am
Being quoted £9K for an additional Powerwall which is unacceptable!
So, looking at other options (if there are any that will play nice with Tesla!)
Estimate is we need an additional 10 - 15kWh to see us stay on overnight rate for all of the year.
We have 10kW solar split between three strings. Thought was to split one off to feed another battery?
https://www.itstechnologies.shop/collec ... octopus-go
I cant make out if this needs an inverter too?
Other options please?
From the ITS page - "Up to 5 batteries can be used with each AC charger/hybrid inverter, multiple charger/inverters can be installed."
I'm also looking to add additional battery storage but am going down the Victron inverter and DIY battery pack route.
Re: Adding additional battery to Tesla Powerwall setup
Posted: Wed Oct 25, 2023 10:45 am
by NikoV6
Fintray wrote: ↑Wed Oct 25, 2023 9:01 am
NikoV6 wrote: ↑Wed Oct 25, 2023 8:10 am
Being quoted £9K for an additional Powerwall which is unacceptable!
So, looking at other options (if there are any that will play nice with Tesla!)
Estimate is we need an additional 10 - 15kWh to see us stay on overnight rate for all of the year.
We have 10kW solar split between three strings. Thought was to split one off to feed another battery?
https://www.itstechnologies.shop/collec ... octopus-go
I cant make out if this needs an inverter too?
Other options please?
From the ITS page - "Up to 5 batteries can be used with each AC charger/hybrid inverter, multiple charger/inverters can be installed."
I'm also looking to add additional battery storage but am going down the Victron inverter and DIY battery pack route.
Sounds interesting, will you be detailing your build?
Re: Adding additional battery to Tesla Powerwall setup
Posted: Wed Oct 25, 2023 12:05 pm
by Moxi
Nikov,
Check the comments section for that link you posted, the price seems to have gone up quite a bit since last year, also IIRC there was some discussion about this same item as sold by Octopus whereby you appear to pay and hand over control to them - hence the battery system appears to not be as accessible and home user friendly as some of the other market options where you can change parameters and settings to suit your needs and with some effort in some cases download your data without having to export to the cloud first - thats if I have understood the other threads on the forum and believe me the ICA side of batteries and inverters is an uphill struggle for me most of the time
Moxi
Re: Adding additional battery to Tesla Powerwall setup
Posted: Wed Oct 25, 2023 12:45 pm
by NikoV6
Moxi wrote: ↑Wed Oct 25, 2023 12:05 pm
Nikov,
Check the comments section for that link you posted, the price seems to have gone up quite a bit since last year, also IIRC there was some discussion about this same item as sold by Octopus whereby you appear to pay and hand over control to them - hence the battery system appears to not be as accessible and home user friendly as some of the other market options where you can change parameters and settings to suit your needs and with some effort in some cases download your data without having to export to the cloud first - thats if I have understood the other threads on the forum and believe me the ICA side of batteries and inverters is an uphill struggle for me most of the time
Moxi
Thanks, will do!
I think my confusion came from it not explicitly stating it needed an inverter on that page. They mention plug and play functionality, for the uninformed it would have been nice to see "Also requires xxxx Inverter to function"
Re: Adding additional battery to Tesla Powerwall setup
Posted: Wed Oct 25, 2023 12:49 pm
by Fintray
NikoV6 wrote: ↑Wed Oct 25, 2023 10:45 am
Fintray wrote: ↑Wed Oct 25, 2023 9:01 am
NikoV6 wrote: ↑Wed Oct 25, 2023 8:10 am
Being quoted £9K for an additional Powerwall which is unacceptable!
So, looking at other options (if there are any that will play nice with Tesla!)
Estimate is we need an additional 10 - 15kWh to see us stay on overnight rate for all of the year.
We have 10kW solar split between three strings. Thought was to split one off to feed another battery?
https://www.itstechnologies.shop/collec ... octopus-go
I cant make out if this needs an inverter too?
Other options please?
From the ITS page - "Up to 5 batteries can be used with each AC charger/hybrid inverter, multiple charger/inverters can be installed."
I'm also looking to add additional battery storage but am going down the Victron inverter and DIY battery pack route.
Sounds interesting, will you be detailing your build?
I'll try my best to give as much detail as I can.
Re: Adding additional battery to Tesla Powerwall setup
Posted: Wed Oct 25, 2023 3:00 pm
by richbee
Fintray wrote: ↑Wed Oct 25, 2023 9:01 am
NikoV6 wrote: ↑Wed Oct 25, 2023 8:10 am
Being quoted £9K for an additional Powerwall which is unacceptable!
So, looking at other options (if there are any that will play nice with Tesla!)
Estimate is we need an additional 10 - 15kWh to see us stay on overnight rate for all of the year.
We have 10kW solar split between three strings. Thought was to split one off to feed another battery?
https://www.itstechnologies.shop/collec ... octopus-go
I cant make out if this needs an inverter too?
Other options please?
From the ITS page - "Up to 5 batteries can be used with each AC charger/hybrid inverter, multiple charger/inverters can be installed."
I'm also looking to add additional battery storage but am going down the Victron inverter and DIY battery pack route.
How do you make sure the inverters play nicely together (if not the same type and connected in parallel), in terms of charging / discharging batteries - you don't want 1 battery discharging to charge the other one.
I guess some of it will come down to the placement of the CT coils & accuracy - plus settings?
Re: Adding additional battery to Tesla Powerwall setup
Posted: Thu Oct 26, 2023 10:29 am
by Fintray
richbee wrote: ↑Wed Oct 25, 2023 3:00 pm
How do you make sure the inverters play nicely together (if not the same type and connected in parallel), in terms of charging / discharging batteries - you don't want 1 battery discharging to charge the other one.
I guess some of it will come down to the placement of the CT coils & accuracy - plus settings?
I think it will be a bit of experimentation to see how they work together, or don't as the case may be!