I've now witnessed 4 battery percentage plunges in the last month on my AIO (commissioned early September - AIO firmware D0.607-A0.607 with battery firmware 6):
- 14-Nov https://ibb.co/Jz2kyXK
- 27-Oct https://ibb.co/c6R1wKs
- 11-Oct https://ibb.co/JK49m4G
- 01-Oct https://ibb.co/H2j2BTx
In an effort to understand whether this is due to:
A/ the battery percentage reading / algorithm being imperfect
B/ the battery not delivering it's full operating range of 13.5kWh
C/ both
I've started digging into the data to try and understand what's happened.
In so doing, I want to make sure I'm interpreting the AIO "Inverter Data" on the web dashboard correctly. I couldn't find a definitive source for this so I've cobbled this glossary together. Would appreciate any feedback people have.
I'm hoping that with some approximate area under the graph calculations, I'll be able to deduce whether it's simply the SOC algo that's awry, or whether I'm not getting the full operating power range from the AIO.
Thanks all.
Field/Header Interpretation
Time Timestamp of reading (in GMT or local time?) - typically 5 minutes apart - in format YYYY-MM-DD hh:mm:ss
Status Status of inverter/component - NORMAL means online, WAITING means standby, OFFLINE means no internet connection (unlikely to get data recorded in this state as no data cached locally on device, only on cloud at time of recording)
VPV1 Voltage from PV array - String 1 (Volts) [1 decimal place]
VPV2 Voltage from PV array - String 2 (Volts) [1dp]
IPV1 Current from PV array - String 1 (Amps) [0dp]
IPV2 Current from PV array - String 2 (Amps) [0dp]
PPV1 Power from PV array - String 1 (Watts) [0dp]
PPV2 Power from PV array - String 2 (Watts) [0dp]
PPV Power from PV array - String 1 + 2 (Watts) [0dp]
PAC Power to AC i.e. Grid (Watts) [+ve means export to Grid, -ve import from Grid, 0dp]
VAC Voltage of AC i.e. Grid supply (Volts) - should be c 230V -6%, +10% i.e. 216.2 to 253V [1dp]
IAC Current of AC i.e. Grid supply (Amps) [Note this is only shown as a positive figure - while PAC may be +ve / -ve depending on net export / import, 1dp]
FAC Frequency of AC i.e. Grid supply (Hertz) - should be 50Hz +/- 1% i.e. 49.5 to 50.5Hz [2dp]
Load Power drawn by House (Watts) [0dp]
PInv Power from Inverter (Watts) - DC/AC conversion [+ve from DC to AC, -ve from AC to DC i.e. battery charging, 0dp]
PEPS Power of EPS (Watts) - tracks very closely to PInv on an AIO [0dp]
VInv Voltage of Inverter (Volts) - operating range? [1dp]
FInv Frequency of Inverter (Hz) - should be identical to FAC [AIO is AC coupled, 2dp]
TInv Temperature of Inverter (Centigrade) - operating range? [1dp]
VBat Voltage of Battery (Volts) - operating range? [2dp]
PBat Power from Battery (Watts) [+ve means withdrawing, - ve means charging] - for AIO max 6kW in either direction [0dp]
TBat Temperature of Battery (Centigrade) - operating range? [1dp]
SOC% State of Charge of Battery (Percentage) - for AIO on default settings should be 4 to 100% [0dp]Approximate maths:
Load - PPV + PAC + Inverter Losses = PInv
PInv + Battery Losses = PBat
