The panels are 6.4kW and the inverter is 6kW.
You can set the reserve power (the lowest the battery will discharge to in normal use) in the Tesla between 0 and 100%. The Tesla max output rate appears to be 5kW. I have it at 10% reserve just to avoid short term blips. If the battery was fully charged when the outage happened, it would have 13kWh available to run off grid if there was no solar input. I also have a 3kW generator wired to a switch box as back up, we have a lot of overhead power lines and trees in our area. My kids call me a “doomsday prepper” so, yes I have tested it, there’s an “off grid” feature on the app. There’s also a nice feature called “storm watch” where depending on local weather forecasts the battery will automatically top up ahead of the event,
The 12p is the Octopus Go tariff between 0030 and 0430.
Interesting info - I think that your being a bit hopeful on your grid consumption/cost over the course of the year but would be interested as to the actual year figures especially as your basing it on off peak kwh rate when in reality you will use an amount of peak kwh rate.
Also the cost of replacing the batteries at the end of their life I feel should also be factored in to give a true reflection of any battery benefit.
Ref generator - make sure you turn off the Solar PV system if generator connected in as it doesn't do the PV inverter or the generator any good unless its specifically designed to be able to handle the generator input such as a SMA Sunny Island.
Personally - Seems like the PV/battery system you have is a suits your requirements well - unfortunately for me we are 3 phase with 15 kWp of Solar PV and we still consume average 30 kwh per day in winter. Trouble is that in summer I have grid consumption of only 10 kwh per day (80% night usage) so battery energy usage would be minimal vs capacity.
I'd need 3 x Powerwall's to cover winter (1 per phase which is Tesla requirement) so circa 39 kwh @ £36k at current prices!
There are other battery storage systems available that I can install at a cost of around £18k for 30 kwh of storage which I'm looking at which will output across all 3 phases but still not convinced its worthwhile.
That's still a large financial outlay for a product that might have a lifetime of 10-15 years....
