Replacing the current spa controller with a custom wifi controlled controller.
2022:
Problems
2023:
New Control Panel
Since I have a custom controller, I decided to add a control panel to the hot tub. The plate was 3D printed with light grey PLA filament. It was then sanded smooth. The center switch controls the lights and the small switch to the left controls the pump. All other controls are set using HomeKit.
AUTO = Powersave Mode
...
{
"accessory": "mqttthing",
"type": "thermostat",
"name": "spa",
"url": "http://192.168.1.50:1883",
"username": "homebridge",
"password": "pass",
"topics":
{
"getCurrentTemperature": {
"topic": "spa/status",
"apply": "return JSON.parse(message).temperature_f;"
},
"getTargetTemperature":{
"topic": "spa/status",
"apply": "return JSON.parse(message).tarTemperature_f;"
},
"getTemperatureDisplayUnits":{
"topic": "spa/status",
"apply": "return 0;"
},
"getCurrentHeatingCoolingState":{
"topic": "spa/status",
"apply": "return JSON.parse(message).state;"
},
"getTargetHeatingCoolingState":{
"topic": "spa/status",
"apply": "return JSON.parse(message).mode;"
},
"setTargetTemperature": {
"topic": "spa/command",
"apply": "return 'setTemp ' + message;"
},
"setTargetHeatingCoolingState": {
"topic": "spa/command",
"apply": "return 'mode ' + message;"
},
"setTemperatureDisplayUnits": {
"topic": "spa/command",
"apply": "return 'tempUnits ' + message;"
}
},
"heatingCoolingStateValues": ["0","1","2","3"],
"temperatureDisplayUnitsValues": [0,1],
"minTemperature": 50,
"maxTemperature": 110
},
... |
...
{
"accessory": "mqttthing",
"type": "fan",
"name": "hottub",
"url": "http://192.168.1.50:1883",
"username": "homebridge",
"password": "pass",
"topics": {
"getOn": {
"topic": "spa/status",
"apply": "return JSON.parse(message).pump > 0 ? true : false;"
},
"setOn": {
"topic": "spa/command",
"apply": "if(message) return 'pumpOnOff 1'; if(message==false) return 'pumpOnOff 0';"
},
"getRotationSpeed": {
"topic": "spa/status",
"apply": "return JSON.parse(message).pump;"
},
"setRotationSpeed": {
"topic": "spa/command",
"apply": "console.log('MESSAGE: ' + message); if(message >50) return 'pumpState 2'; if(message==0) return 'pumpState 0'; return 'pumpState 1';"
}
}
},
... |
Waterway Executive 48 2.0 HP pump | |
|---|---|
Description | 2.0HP Waterway Executive 48 Spa Pump, 2 Speed Waterway OEM part # 3420820-1A 2.0" intake and 2.0" discharge, (Measures 3" outside to outside) |
| Voltage | 220-240volt |
| High Speed Details | 10.5 Amps high speed (3450 RPM) 2.5KW |
| Low Speed Details | 2.8 Amps low speed (1725 RPM) 0.67KW |
Assuming PEAK RATE = $0.21/kwh, OFF-PEAK = $0.13
Assuming pump is running for 9 hours/day @LOW SPEED
Assuming pump is running for hours/day @HIGH SPEED
| SPEED | Power Consumption | Rate | Cost/hour | Cost/day |
|---|---|---|---|---|
| Low Speed | 0.67kw | PEAK | $0.14 | $1.26 |
| OFF-PEAK | $0.09 | $0.81 | ||
| High Speed | 2.5kw | PEAK | $0.52 | $0.52 |
| OFF-PEAK | $0.33 | $0.33 |
Assuming
| Cost | Calculation | Total |
|---|---|---|
| Cost/day | 9*$0.14 + 1*$0.52 = $1.26 + $0.52 | $1.78 |
| Cost/moth | Cost/day *30 = $1.78 * 30 | $53.40 |
| Name | Universal Heater Assembly - 4 kW |
|---|---|
| Description | 15" heater manifold (measured from stainless steel flange to flange). 5 options for location of pressure switch (includes threaded plugs). Moveable bands allow movement of thermal well (for sensors) and studs to connect to pack box. Includes black split nut unions and white PVC unions (as pictured). - 2" white PVC slip connections accept 2" pipe (2-3/8" O.D.). - 2" threaded connections measure 3" O.D. on threads. |
| Supplier | Hot Tub Essentials |
| Voltage | 240v |
| Power Consumption | 4 kw |
Assuming PEAK RATE = $0.21/kwh, OFF-PEAK = $0.13
| Power Consumption | Rate | Cost/hour |
|---|---|---|
| 4kw | PEAK | $0.84 |
| OFF-PEAK | $0.52 |
Assuming
| Cost | Calculation | Total |
|---|---|---|
| Cost/day | 2 * $0.52 | $1.04 |
| Cost/month | Cost/day *30 = $1.04 * 30 | $31.20 |