I'm looking for ideas and suggestions to build a 220v ~ 40 amp wifi switch for controlling my pool pump so that it can replace my mechanical timer.
Very few devices are available on the market. There are both relatively expensive and according to the reviews don't live up to expectations in terms of reliability and build:
- WiOn Outdoor Wi-Fi Smart Box
- Generic WIFI Relay Module 6000W High Power 220V 30A
- KTNNKG 30amps Smart Pump Switch
The main issue seems to come from the terminal connections not being big or sturdy enough for 10 gage wire.
Looking at the Migro Outdoor Smart Wi-Fi Outlet Box it seems they have combined a contactor with a sonoff switch which seems like the best option. This video explains how a contactor works. Migro are charging around $140 whereas the contactor on it's own only costs $14 here and the sonoff switch $8 here.
Does building one seem the best / cheapest option?