What is the operation mode then?

At this time after moving I have no solar power yet. So my 8kw Deye is up and running as “UPS” only.

How should I manage the battery during this time?

@ChrisVermaak

I believe you should use the TOU settings, allowing you to set the percentage of Battery SOC when the GRID is allowed to charge the batteries at which timeslots. Start from midnight (00:00)

2 hours ago, ChrisVermaak said:

What is the operation mode then?

At this time after moving I have no solar power yet. So my 8kw Deye is up and running as “UPS” only.

How should I manage the battery during this time?

What tariff are you on? If you have got a time-off-use tariff with different charges depending on the time of day, then it may make sense to run the battery down during peak hours and charge it again from the night-time or off-peak tariff.

If there's no financial benefit to be had like that, then don't bother cycling the battery (in general), it will cost you some battery cycles and extra electricity costs, for no real reason. Just keep it on standby in UPS mode most of the time.

Maybe just schedule a discharge to 30% or so once in a while so that the battery does not remain fully charged 100% all of the time. Try to follow the manufacturer's recommendations for charge level if available. Try to get solar panels asap.

Ok but then why is the the option to tick or select it?

I had my tou setting at charge to 73% at all times with discharge only happening with utility power fail.

I have unticked that option then a immediately all the time settings were greyed out and the battery charging resumed, I assume to now charge to 100%.

2 minutes ago, GreenFields said:

What tariff are you on? If you have got a time-off-use tariff with different charges depending on the time of day, then it may make sense to run the battery down during peak hours and charge it again from the night-time or off-peak tariff.

If there's no financial benefit to be had like that, then don't bother cycling the battery (in general), it will cost you some battery cycles and extra electricity costs, for no real reason. Just keep it on standby in UPS mode most of the time.

Maybe just schedule a discharge to 30% or so once in a while so that the battery does not remain fully charged 100% all of the time. Try to follow the manufacturer's recommendations for charge level if available. Try to get solar panels asap.

Exactly where I am now. And the two pylontech 5000 batteries are now at 99% charge with 0.15kw charging (trickle charge?)

My thinking is that I don’t want to cycle (use) the battery except for the unavoidable power dips sometimes 1hour long. So I am leaving the battery now to the BATTERY MANAGEMENT.

Not sure if that is right or best though.

6 minutes ago, ChrisVermaak said:

I had my tou setting at charge to 73% at all times with discharge only happening with utility power fail

This is not optimal for your battery - we don't have load shedding anymore. Lithium batteries need to cycle - don't keep it topped up! To charge the battery without solar will be more expensive as explained by @GreenFields

You mean just cycle the battery and use up its life anyway without having the benefit of storage of free solar power at this time.

Without solar panels you have zero free power.

On this topic people stress too much. If your lifep04 battery is fully charged, but not overcharged it is not a problem even if they are not cycled frequently. Do not overcharged, keep the cells balanced, do not charge or discharge beyond cell rating( heat damage).Do not store open curcuit as the internal discharge rate is 3%/month bms could not protect the battery at low current discharge. If you have the battery for self consumption or just in case of power failure it does not matter use it you paid for it calendar ageing is happening if you use it or not!

On 12/5/2025 at 8:00 PM, TaliaB said:

calendar ageing is happening if you use it or not!

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