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Solax X1/X3-HAC: add CurrentLimiter (#33181)

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Jakob Altevolmer 2026-08-25 22:39:28 +02:00 • committed by GitHub
parent 88a4004d4d
commit 887ec9ecd2
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GPG key ID: B5690EEEBB952194
1 changed files with 34 additions and 5 deletions
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39
charger/solax.go
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@ -37,16 +37,20 @@ type Solax struct {
log *util.Logger
conn *modbus.Connection
enabled bool
maxCurrent float64
isLegacyHw bool
}
const (
// register map per "X1/X3-HAC EV Charger Modbus TCP/RTU protocol V1.0.0"
// holding (FC 0x03, 0x06, 0x10)
solaxRegSerialNumber = 0x0600 // 7x string
solaxRegDeviceMode = 0x060D // uint16
solaxRegCommandControl = 0x0627 // uint16
solaxRegMaxCurrent = 0x0628 // uint16 0.01A
solaxRegPhaseSwitch = 0xA105 // uint16
solaxRegSerialNumber = 0x0600 // 7x string
solaxRegDeviceMode = 0x060D // uint16
solaxRegCommandControl = 0x0627 // uint16
solaxRegMaxCurrent = 0x0628 // uint16 0.01A, spec: adjust_charge_current
solaxRegMaxChargeCurrent = 0x0668 // uint16 0.01A, spec: MaxChargeCurrent, the device-side ceiling
solaxRegPhaseSwitch = 0xA105 // uint16
// input (FC 0x04)
solaxRegVoltages = 0x0000 // 3x uint16 0.01V
@ -212,6 +216,25 @@ func (wb *Solax) MaxCurrentMillis(current float64) error {
return err
}
var _ api.CurrentLimiter = (*Solax)(nil)
// GetMinMaxCurrent implements the api.CurrentLimiter interface
func (wb *Solax) GetMinMaxCurrent() (float64, float64, error) {
b, err := wb.conn.ReadHoldingRegisters(solaxRegMaxChargeCurrent, 1)
if err != nil {
return 0, 0, err
}
// the device-side ceiling is set in the Solax app, not by evcc; log it on change
// so a loadpoint silently capped below its configured maximum is traceable
if max := float64(encoding.Uint16(b)) / 100; max != wb.maxCurrent {
wb.maxCurrent = max
wb.log.INFO.Printf("device max charge current: %.1fA", max)
}
return 6, wb.maxCurrent, nil
}
var _ api.Meter = (*Solax)(nil)
// CurrentPower implements the api.Meter interface
@ -324,6 +347,12 @@ func (wb *Solax) Diagnose() {
fmt.Printf("\tLock State:\tUnknown (%d)\n", state)
}
}
if b, err := wb.conn.ReadHoldingRegisters(solaxRegMaxCurrent, 1); err == nil {
fmt.Printf("\tAdjust Charge Current:\t%.2fA\n", float64(encoding.Uint16(b))/100)
}
if b, err := wb.conn.ReadHoldingRegisters(solaxRegMaxChargeCurrent, 1); err == nil {
fmt.Printf("\tMax Charge Current:\t%.2fA\n", float64(encoding.Uint16(b))/100)
}
if b, err := wb.conn.ReadHoldingRegisters(solaxRegDeviceMode, 1); err == nil {
switch state := encoding.Uint16(b); state {
case solaxModeStop: