Can I leave the battery disconnected for few months?

[castellani]

Good afternoon, new member here

I watched the explanatory video that Will made about "How to isolate a FoxESS system" in order to troubleshoot, and reset the system.

But I was wandering if it is possible to just isolate and leave the battery disconnected pressing first the recessed button with the edge Will speaks about on the battery, and then the circuit breaker and leave it like that for few months in order to avoid any depletion of the battery since nobody is gong to leave in the house for few months but keep the PV and inverter on and sell back to the grid the energy they solar system produces during the day.

And when someone will go back and resume living in the house I can fire back on the battery flicking first the circuit breaker and then the button on the battery.

Anything wrong with my idea?


Thanks,
Marco

[Dave Foster]

Yes that is possible and it will work fine - without battery when the solar falls below the startup voltage level the inverter will go into standby and simply wait for the next dawn when it has enough power to startup again.

The battery will lose around 3% soc each month because of internal resistance so I would advise charging it to around 75% first if you are leaving it for 3-6 months - it will likely report a battery error but at least you’ll know why

The only thing to add is that you're not saving much power by turning the battery off, during darkest winter it may save 1kWh overnight but in most months the battery will store any excess and feed the house, and any excess after that being sold to the grid.

The only thing you are really saving are a few battery cycles and these batteries are good for 4000-6000 cycles, ageing (not cycles) has a bigger affect than cycles so I would suggest leaving them on and let them continue to do their job.
As you are more aware of your personal circumstances / power use whilst you are not at the house - you can leave them on, or turn them off safely whichever you choose.

[castellani]

Hi Dave,

Thanks for the answer.
I will not prolong life that much as you are saying, but I still try to optimise what I can, as I don't like wasting anything if I can help it.
Few months might become even a little more so I like to plan ahead!

Cheers
Marco