Automatic switch from 1-p to 3-p does not work

[wolledaum]

Description

I have set up the charging point in evcc to automatic. But the switch from 1-p to 3-p does not happen even if my PV brings 5 an more kW. When I manually switch to 3-p it works. Automatic switch back from 3-p to 1-p works.

Steps to Reproduce

Set automatic switch
In the morning the charging starts with 1-p, as the PV brings not enough power. But even when the PV brings enough power the automatic mode doesn’t switch to 3-p to use the full power for charging.

⚠️ RETURN TO EVCC TAB → COPY STEP 2 → PASTE HERE

Version

v0.312.1

System

linux/amd64, CEST +02:00

Configuration (YAML)

network:
  schema: http
  port: 7070
log: info
interval: 10s
meters:
  - name: grid
    type: template
    template: sungrow-hybrid
    usage: grid
    host: 192.168.178.110
    port: 502
    id: 1
  - name: pv
    type: template
    template: sungrow-hybrid
    usage: pv
    host: 192.168.178.110
    port: 502
    id: 1
  - name: battery
    type: template
    template: sungrow-hybrid
    usage: battery
    host: 192.168.178.110
    port: 502
    id: 1
    capacity: 9.6
chargers:
  - name: peblar
    type: custom
    template: peblar-modbus
    host: 192.168.178.46
    port: 502
    id: 1

Configuration (UI)

{
  "charger": [
    {"id":7,"name":"db:7","type":"template","config":{"id":1,"template":"peblar","baudrate":9600,"comset":"8N1","host":"192.168.178.46","modbus":"tcpip","port":502},"deviceProduct":"Peblar Business"}
  ],
  "experimental": false,
  "influx": {"database":"","insecure":false,"org":"","password":"","token":"","url":"","user":""},
  "interval": 10,
  "loadpoints": [
    {"id":8,"name":"db:8","batteryBoostLimit":100,"charger":"db:7","defaultMode":"pv","limitEnergy":0,"limitSoc":0,"maxCurrent":32,"minCurrent":6,"minSoc":0,"phasesConfigured":3,"planEnergy":0,"planPrecondition":0,"planStrategy":{"continuous":false,"precondition":0},"planTime":"0001-01-01T00:00:00Z","priority":0,"smartCostLimit":null,"smartFeedInPriorityLimit":null,"soc":{"estimate":true,"poll":{"interval":3600000000000,"mode":"charging"}},"thresholds":{"disable":{"delay":180000000000,"threshold":0},"enable":{"delay":60000000000,"threshold":0}},"title":"Wallbox","ui":{"maxTemp":100,"minTemp":0},"vehicle":"db:9"}
  ],
  "meter": [
    {"id":3,"name":"db:3","type":"template","config":{"id":1,"template":"sungrow-hybrid","baudrate":9600,"comset":"8N1","host":"192.168.178.110","maxacpower":10000,"modbus":"tcpip","port":502,"usage":"pv"},"deviceProduct":"Sungrow SH Series Hybrid Inverter","deviceTitle":"PV"},
    {"id":2,"name":"db:2","type":"template","config":{"id":1,"template":"sungrow-hybrid","baudrate":9600,"comset":"8N1","host":"192.168.178.110","maxacpower":"0","modbus":"tcpip","port":502,"usage":"grid"},"deviceProduct":"Sungrow SH Series Hybrid Inverter"},
    {"id":4,"name":"db:4","type":"template","config":{"id":1,"template":"sungrow-hybrid","baudrate":9600,"capacity":9.6,"comset":"8N1","host":"192.168.178.110","maxacpower":"0","maxchargepower":5760,"maxdischargepower":5760,"maxsoc":100,"minsoc":5,"modbus":"tcpip","port":502,"usage":"battery"},"deviceProduct":"Sungrow SH Series Hybrid Inverter","deviceTitle":"Batterie Haus"}
  ],
  "mqtt": {"broker":"","caCert":"","clientCert":"","clientID":"","clientKey":"","insecure":false,"password":"","topic":"evcc","user":""},
  "residualPower": 0,
  "shm": {"deviceId":"","deviceSerial":"","vendorId":""},
  "site": {"aux":null,"battery":["db:4"],"consumer":null,"ext":null,"grid":"db:2","pv":["db:3"],"title":"EVCC"},
  "tariff": [
    {"id":6,"name":"db:6","type":"template","config":{"template":"fixed","price":0.08199999999999999},"deviceProduct":"Fester Preis"},
    {"id":5,"name":"db:5","type":"template","config":{"template":"fixed","price":0.2916},"deviceProduct":"Fester Preis"}
  ],
  "tariffRefs": {"co2":"","feedIn":"db:6","grid":"db:5","planner":"","solar":[],"temperature":""},
  "vehicle": [
    {"id":9,"name":"db:9","type":"template","config":{"template":"smart-hello","autodetectdisabled":false,"cache":"15m","capacity":100,"climaterdisabled":false,"coarsecurrent":false,"icon":"car","maxPower":22000,"password":"***","priority":0,"streaming":false,"title":"Smart #5","user":"***","wakeupdisabled":false,"welcomecharge":false},"deviceProduct":"Smart #1"}
  ]
}

Logs

[lp-1  ] DEBUG 2026/07/25 12:02:47 !! plan: plan time zero
[lp-1  ] DEBUG 2026/07/25 12:02:47 pv charge current: 8.76A = 8.73A + 0.029A (-20W @ 3p)
[lp-1  ] DEBUG 2026/07/25 12:02:47 set charge current limit: 8.76A
[site  ] DEBUG 2026/07/25 12:02:56 ----
[lp-1  ] DEBUG 2026/07/25 12:02:56 charge power: 5792W
[lp-1  ] DEBUG 2026/07/25 12:02:56 charge currents: [8.25 8.21 8.28]A
[site  ] DEBUG 2026/07/25 12:02:56 grid power: 6W
[site  ] DEBUG 2026/07/25 12:02:57 pv 1 power: 6193W
[site  ] DEBUG 2026/07/25 12:02:57 battery 1 power: 0W
[site  ] DEBUG 2026/07/25 12:02:57 grid currents: [0.0251 -0.169 0.281]A
[site  ] DEBUG 2026/07/25 12:02:57 battery 1 soc: 100%
[site  ] DEBUG 2026/07/25 12:02:57 site power: 6W
[lp-1  ] DEBUG 2026/07/25 12:02:57 charge voltages: [236 234 236]V
[lp-1  ] DEBUG 2026/07/25 12:02:57 detected active phases: 3p
[lp-1  ] DEBUG 2026/07/25 12:02:57 session energy: 10.187kWh
[lp-1  ] DEBUG 2026/07/25 12:02:57 charge total import: 57.939kWh
[lp-1  ] DEBUG 2026/07/25 12:02:57 charger status: C
[lp-1  ] DEBUG 2026/07/25 12:02:57 vehicle soc: 89%
[lp-1  ] DEBUG 2026/07/25 12:02:57 vehicle soc limit: 0%
[lp-1  ] DEBUG 2026/07/25 12:02:57 vehicle range: 396km
[lp-1  ] DEBUG 2026/07/25 12:02:57 soc estimated: 89.50% (vehicle: 89.00%)
[lp-1  ] DEBUG 2026/07/25 12:02:57 vehicle soc (estimator): 90%
[lp-1  ] DEBUG 2026/07/25 12:02:57 !! plan: plan time zero
[lp-1  ] DEBUG 2026/07/25 12:02:57 pv charge current: 8.75A = 8.76A + -0.0087A (6W @ 3p)
[lp-1  ] DEBUG 2026/07/25 12:02:57 set charge current limit: 8.75A

[github-actions]

Thanks for the report. To investigate the automatic 1p→3p phase switching not triggering, I need a few more details that aren't in the report yet:

1. Loadpoint/charger config — specifically the charger type, minCurrent/maxCurrent, and phase settings (from your evcc.yaml or UI config).
2. Debug log excerpt covering a period where PV surplus was clearly available (5+ kW) but no switch to 3p happened. Please start evcc with --log debug (or set log level to debug in the UI) and share the relevant lines — they'll show whether the "phase" switch timer is starting and why it isn't completing.
3. The enable delay setting for phase switching (Settings → this loadpoint), since a long delay combined with fluctuating surplus could explain this.
4. Whether the vehicle explicitly reports its phase capability (some vehicles only report 1-phase support, which would cap MaxActivePhases() at 1 regardless of available PV power).

The "Steps to Reproduce" section in the report still contains the unfilled template placeholder, so please also fill that in with the actual reproduction steps.

Without logs/config it's not possible to distinguish a genuine software defect from a configuration issue (e.g. enable delay, current limits, or vehicle phase reporting), so I can't confirm a root cause yet.

🤖 Generated with Claude Code

[wolledaum]

Configuration (YAML)

network:
  schema: http
  port: 7070
log: info
interval: 10s
meters:
  - name: grid
    type: template
    template: sungrow-hybrid
    usage: grid
    host: 192.168.178.110
    port: 502
    id: 1
  - name: pv
    type: template
    template: sungrow-hybrid
    usage: pv
    host: 192.168.178.110
    port: 502
    id: 1
  - name: battery
    type: template
    template: sungrow-hybrid
    usage: battery
    host: 192.168.178.110
    port: 502
    id: 1
    capacity: 9.6
chargers:
  - name: peblar
    type: custom
    template: peblar-modbus
    host: 192.168.178.46
    port: 502
    id: 1

Configuration (UI)

{
  "charger": [
    {"id":7,"name":"db:7","type":"template","config":{"id":1,"template":"peblar","baudrate":9600,"comset":"8N1","host":"192.168.178.46","modbus":"tcpip","port":502},"deviceProduct":"Peblar Business"}
  ],
  "experimental": false,
  "influx": {"database":"","insecure":false,"org":"","password":"","token":"","url":"","user":""},
  "interval": 10,
  "loadpoints": [
    {"id":8,"name":"db:8","batteryBoostLimit":100,"charger":"db:7","defaultMode":"pv","limitEnergy":0,"limitSoc":0,"maxCurrent":32,"minCurrent":6,"minSoc":0,"phasesConfigured":3,"planEnergy":0,"planPrecondition":0,"planStrategy":{"continuous":false,"precondition":0},"planTime":"0001-01-01T00:00:00Z","priority":0,"smartCostLimit":null,"smartFeedInPriorityLimit":null,"soc":{"estimate":true,"poll":{"interval":3600000000000,"mode":"charging"}},"thresholds":{"disable":{"delay":180000000000,"threshold":0},"enable":{"delay":60000000000,"threshold":0}},"title":"Wallbox","ui":{"maxTemp":100,"minTemp":0},"vehicle":"db:9"}
  ],
  "meter": [
    {"id":3,"name":"db:3","type":"template","config":{"id":1,"template":"sungrow-hybrid","baudrate":9600,"comset":"8N1","host":"192.168.178.110","maxacpower":10000,"modbus":"tcpip","port":502,"usage":"pv"},"deviceProduct":"Sungrow SH Series Hybrid Inverter","deviceTitle":"PV"},
    {"id":2,"name":"db:2","type":"template","config":{"id":1,"template":"sungrow-hybrid","baudrate":9600,"comset":"8N1","host":"192.168.178.110","maxacpower":"0","modbus":"tcpip","port":502,"usage":"grid"},"deviceProduct":"Sungrow SH Series Hybrid Inverter"},
    {"id":4,"name":"db:4","type":"template","config":{"id":1,"template":"sungrow-hybrid","baudrate":9600,"capacity":9.6,"comset":"8N1","host":"192.168.178.110","maxacpower":"0","maxchargepower":5760,"maxdischargepower":5760,"maxsoc":100,"minsoc":5,"modbus":"tcpip","port":502,"usage":"battery"},"deviceProduct":"Sungrow SH Series Hybrid Inverter","deviceTitle":"Batterie Haus"}
  ],
  "mqtt": {"broker":"","caCert":"","clientCert":"","clientID":"","clientKey":"","insecure":false,"password":"","topic":"evcc","user":""},
  "residualPower": 0,
  "shm": {"deviceId":"","deviceSerial":"","vendorId":""},
  "site": {"aux":null,"battery":["db:4"],"consumer":null,"ext":null,"grid":"db:2","pv":["db:3"],"title":"EVCC"},
  "tariff": [
    {"id":6,"name":"db:6","type":"template","config":{"template":"fixed","price":0.08199999999999999},"deviceProduct":"Fester Preis"},
    {"id":5,"name":"db:5","type":"template","config":{"template":"fixed","price":0.2916},"deviceProduct":"Fester Preis"}
  ],
  "tariffRefs": {"co2":"","feedIn":"db:6","grid":"db:5","planner":"","solar":[],"temperature":""},
  "vehicle": [
    {"id":9,"name":"db:9","type":"template","config":{"template":"smart-hello","autodetectdisabled":false,"cache":"15m","capacity":100,"climaterdisabled":false,"coarsecurrent":false,"icon":"car","maxPower":22000,"password":"***","priority":0,"streaming":false,"title":"Smart #5","user":"***","wakeupdisabled":false,"welcomecharge":false},"deviceProduct":"Smart #1"}
  ]
}

Logs

[lp-1  ] DEBUG 2026/07/25 12:02:47 !! plan: plan time zero
[lp-1  ] DEBUG 2026/07/25 12:02:47 pv charge current: 8.76A = 8.73A + 0.029A (-20W @ 3p)
[lp-1  ] DEBUG 2026/07/25 12:02:47 set charge current limit: 8.76A
[site  ] DEBUG 2026/07/25 12:02:56 ----
[lp-1  ] DEBUG 2026/07/25 12:02:56 charge power: 5792W
[lp-1  ] DEBUG 2026/07/25 12:02:56 charge currents: [8.25 8.21 8.28]A
[site  ] DEBUG 2026/07/25 12:02:56 grid power: 6W
[site  ] DEBUG 2026/07/25 12:02:57 pv 1 power: 6193W
[site  ] DEBUG 2026/07/25 12:02:57 battery 1 power: 0W
[site  ] DEBUG 2026/07/25 12:02:57 grid currents: [0.0251 -0.169 0.281]A
[site  ] DEBUG 2026/07/25 12:02:57 battery 1 soc: 100%
[site  ] DEBUG 2026/07/25 12:02:57 site power: 6W
[lp-1  ] DEBUG 2026/07/25 12:02:57 charge voltages: [236 234 236]V
[lp-1  ] DEBUG 2026/07/25 12:02:57 detected active phases: 3p
[lp-1  ] DEBUG 2026/07/25 12:02:57 session energy: 10.187kWh
[lp-1  ] DEBUG 2026/07/25 12:02:57 charge total import: 57.939kWh
[lp-1  ] DEBUG 2026/07/25 12:02:57 charger status: C
[lp-1  ] DEBUG 2026/07/25 12:02:57 vehicle soc: 89%
[lp-1  ] DEBUG 2026/07/25 12:02:57 vehicle soc limit: 0%
[lp-1  ] DEBUG 2026/07/25 12:02:57 vehicle range: 396km
[lp-1  ] DEBUG 2026/07/25 12:02:57 soc estimated: 89.50% (vehicle: 89.00%)
[lp-1  ] DEBUG 2026/07/25 12:02:57 vehicle soc (estimator): 90%
[lp-1  ] DEBUG 2026/07/25 12:02:57 !! plan: plan time zero
[lp-1  ] DEBUG 2026/07/25 12:02:57 pv charge current: 8.75A = 8.76A + -0.0087A (6W @ 3p)
[lp-1  ] DEBUG 2026/07/25 12:02:57 set charge current limit: 8.75A

[wolledaum]

evcc-20260725-121453-debug.log

[andig]

Thanks for the config and the log. This looks like expected behaviour for your current limits rather than a defect.

Why the switch does not happen

evcc only scales 1p to 3p when a single phase can no longer absorb the available surplus. With your settings (minCurrent: 6, maxCurrent: 32, 230 V) the two thresholds are:

• 1p to 3p: available power > 32 A x 230 V = 7360 W, held for the enable delay (60 s)
• 3p to 1p: available power < 3 x 6 A x 230 V = 4140 W, held for the disable delay (180 s)

Your surplus ("5 and more kW", the log shows 6193 W PV) falls between those two values, so evcc keeps whatever phase count is currently active. That is exactly the asymmetry you observe: the down-switch triggers, the up-switch does not. From evcc's point of view 1p at up to 32 A can take 7.4 kW, so switching to 3p would not use more solar power. What evcc cannot know is that your car may accept much less than 32 A on a single phase.

What to change

Lower maxCurrent on the loadpoint. Keep it above 18 A, otherwise the up- and down-thresholds cross and the loadpoint would oscillate. maxCurrent: 20 gives:

• 1p to 3p at 4600 W
• 3p to 1p at 4140 W

That should switch up in the situation you describe.

Two things to confirm

1. Your exported config contains "phasesConfigured": 3, which means the loadpoint is fixed to 3 phases. With that setting evcc does not switch automatically in either direction. Please check that the phase setting of the loadpoint is set to automatic while the problem occurs. If the export was taken after you manually forced 3p, that would explain it.
2. The attached debug log covers 11:47 to 12:14 and shows 3p charging throughout, so it does not contain the failing situation. A log from the morning while charging with 1p and surplus available would show whether the phase timer starts at all (look for start phase 3p timer and switched phases).

Charger support is not the problem: the Peblar integration offers 1p/3p switching when the independent relay register reports it, which matches manual switching working for you.

🤖 Generated with Claude Code

[RlfSt]

It's the same behaviour with a SMA STP10SE (this on is a re-labeled Sungrow). With SEMP you can't lock the phases to 1 or 3 - therefore it would be nice, if you could define two tresholds, for example for 1p 6-20A (1380W to 4600) and for 3p 7-20A (4830 to 13800). As I can see, the loadpoint always uses 3p when >=4830W are offered and always uses 1p when <=4600 are offered at the begin of charge - and if you lock the loadpoint to 1 or 3 phases in the GUI with this configuration the loadpoint would never switch the phases if you don't want so.

[andig]

@premultiply