DPL - is this behavior normal ?

[alexz707]

HI!
I have a question to my setup and I'm not sure if this is the expected behavior.
Until yesterday I would say it was different:

So my setup is as following:
I'm using 2s2p PV panels on a SmartSolar MPPT 150|35
which is connected to a LTO Battery and a Hoymiles 800.

I have DPL enabled and usually in the night the battery gets completely empty (until the voltage drops to the limit)
Then on the next day the system tries to feed the power from the panels into my appartment and charges the battery if there is more power than needed.
In the evening (when the night time is reached) it starts feeding from the battery to my appartment again.

That is until now the expected behavior.
Yesterday the battery got really really full so it was possible to feed power into the appartment the whole night without hitting the low voltage limit of the DPL. So the pv panels started producing energy.
Now the whole day whenever there was more energy needed than the pv produced the battery got drained.

So I was wondering because I thought when the time reaches the daylight time (Morgendämmerung) the draining of the battery should stop and only start after the night time (Abenddämmerung) was reached.

Am I correct or did I understand something wrong?

I have attached a log from DPL as well as my config and the some screens of my HA.

17:23:43.543 > [DPL] up 236441 s, next inverter restart at 260236 s (set to 0)
17:23:43.550 > [DPL] battery interface disabled, SoC 0.0 % (used), age 236441 s (stale)
17:23:43.557 > [DPL] BMS: -1.00 V, MPPT: 48.71 V, inverter 114181809761: 48.50 
17:23:43.563 > [DPL] battery voltage 48.71 V, load-corrected voltage 49.06 V @ 320 W, factor 0.00110 1/A
17:23:43.572 > [DPL] battery discharge allowed, start 55.00 V or 80 %, stop 44.00 V or 20 %
17:23:43.579 > [DPL] full solar-passthrough dormant, start 56.00 V or 100 %, stop 54.00 V
17:23:43.589 > [DPL] start NOT reached, stop NOT reached, solar-passthrough enabled, use at night enabled and dormant
17:23:43.597 > [DPL] total max AC power is 800 W, conduction losses are 3 %
17:23:43.606 > [DPL] targeting 0 W, base load is 100 W, power meter reads -10.2 W (valid)
17:23:43.617 > [DPL] inverter 114181809761 is behind power meter producing 320 W
17:23:43.629 > [DPL] granting 310 W from DC power bus (no battery discharge limit), solar power is 9/8 W DC/AC
17:23:43.644 > [DPL] requesting 310 W from 1 battery-powered inverter currently producing 320 W (diff -10 W, hysteresis 15 W)
17:23:43.653 > [DPL inverter 114181809761]:
17:23:43.658 >     battery-powered, producing 320 W
17:23:43.666 >     lower/current/upper limit: 26/312/800 W, output capability: 800 W
17:23:43.673 >     sending commands enabled, reachable, eligible
17:23:43.707 >     max reduction production/standby: 294/320 W, max increase: 488 W
17:23:43.715 >     target limit/output/state: -1 W (unchanged)/320 W/unchanged, 0 update timeouts
17:23:43.720 >     MPPTs AC power: a: 171 W b: 149 W

[spcqike]

i'd say its normal.

you checked "use battery at night, even if not fully charged". so i guess you never reached "battery start threshold" (55V), until yesterday.

now, as your battery is considered "charged up", DPL uses it as long as it doesn't reach the stop value (44V).

at leasts that what i would expect from the system.

[alexz707]

thanks a lot for your answer.
Yesterday I've rebooted the system and the feeding during the day stopped.

Today in the morning the battery was still not empty and exactly at the change between night and day the feeding stopped.
It started again at night time (Abenddämmerung).

So I guess this should be normal behaviour. @schlimmchen am I right?
Currently I would say it was a hickup - will monitor the behaviour when the weather is sunny again - I don't think that it will last over this night because it was partly cloudy today.

[spcqike]

Yesterday I've rebooted the system and the feeding during the day stopped.

I don’t think, it was above 55V, was it?

So, you just resettet the system. you have kind of a floating state. The system doesn’t know what to do with your battery, as it’s between empty (44V) and full (55V). So, it doesn’t discharge it.
Except for the night, as you checked „use battery at night even if not fully charged“.

so, you are back at the beginning. The system doesn’t know if you are in a charging or discharging cycle. So it’s charging up.