Objective
Replacing the current spa controller with a custom wifi controlled controller.
Control Board
Verison 1
Schematic
Board Layout
Version 2
Changes
- Move Flow sensor to ADC on CH7 in order to free up GPIO 0
- Use GPIO to trigger light relay
Schematic
Board Layout
Pump
Specifications
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 |
Cost Calculations
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
- PEAK Power Rate
- 9 hours on LOW
- 1 hour on HIGH
| 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 |
Heater
Specifications
| 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 |
Cost Calculations
Assuming PEAK RATE = $0.21/kwh, OFF-PEAK = $0.13
| Power Consumption | Rate | Cost/hour |
|---|---|---|
| 4kw | PEAK | $0.84 |
| OFF-PEAK | $0.52 |
Assuming
- OFF-PEAK Rate
- 2 hours per day
| Cost | Calculation | Total |
|---|---|---|
| Cost/day | 2 * $0.52 | $1.04 |
| Cost/month | Cost/day *30 = $1.04 * 30 | $31.20 |