Best mode of AIO operation for battery life / performance

I had an AIO and a 5.2kW array installed this summer. We often go away for a few weeks at a time (particularly between autumn and spring), so the house load is a lot lighter.

For argument sake, let's say the house load when we're away is 4x the usable capacity of the battery. Let's say it's winter, so sporadic PV generation. I therefore have a few options in terms of how I configure the use of the AIO. I've listed the obvious ones that I've thought of, and what I consider the pluses and minuses of the approach.

But what's not clear to me is what best for the AIO batteries - hence the question marks below. I anticipate that batteries have finite cycles, so fewer full cycles is better. But is is it bad for the batteries if the AIO never fully discharges, if it's being topped up daily from c 75% to 100% whenever were away? Should I be deliberately discharging it each day, or letting it do so over the course of several days of use?

Would really welcome your opinions and feedback!

1) Charge AIO from 75% to 100% each morning at off peak times
(+) Hold maximum charge in case of a power cut i.e. keep the essentials running (we get a lot of supply interruptions) on average c. 88%
(?) AIO batteries never fully discharge (bad for performance?)
(-) Don't get to discharge AIO to grid at peak times, so reduces return on investment
(+) Benefit from PV mostly grid export when AIO full, minor charging of AIO

2) Only charge AIO when SoC goes below 10% (say) at off-peak times
(=) Only have c. 50% charge in case of power cut (averaged over several days)
(?) AIO batteries fully discharges every 4+ days (so lower cycles per annum)
(-) Don't get to discharge AIO to grid at peak times, so reduces return on investment
(++) Benefit from both PV goes to AIO charging, and grid export when AIO full

3) Fully charge AIO at off-peak and discharge excess at peak-times every day
(=) Only have c. 50% charge in case of power cut (averaged over the day - 15% overnight, 85% during day)
(?) AIO batteries fully discharge every day (so higher cycles per annum)
(++) Get to sell back excess charge at peak times to improve ROI
(+) Benefit from PV mostly grid export when AIO full, minor charging of AIO

Use a forecaster such as solcast to work predict the solar generation likely during the day. Charge the battery during cheap tariff enough to cover your baseline usage whilst you are away taking into account the solar generation. Add a margin if you want to cover any variability. If you don't have regular power cuts ignore them. Don't over think it.

General advice for lithium ion batteries is 20-80% give or take.

I’d probably try and keep the battery in the 50-60% range when you’re away.

50% reserve would keep the bottom end covered. You could probably then schedule some discharge at most advantageous time if it was above 75% down to the 50%.

Home assistant is probably your friend 👍

the AIO batteries have a generous margin already built in. use 5 to 100% as you want to