Doug Roberson

https://shelly.link/usa/gates  Plus 1 Plus Uni Plus 2PM

Good morning! I think you're making this more complicated than is warranted. Whenever you install an electrical product, you make sure that the load doesn't exceed the product's capacity. An example is Shelly Plus 2PM, which has already completed UL certification. Each of the two relays in the device is rated for 8 amps. Use the product in a manner consistent with its specs and manufacturer's recommendations and you're fine. Also, please note that YouTube videos only monetize when people are watching them. What's going to get more views - one of countless videos on how to use a product correctly or a video of an idiot applying 15 amps to a product rated for 8 amps? People are going to watch because they want to see if the idiot starts a fire.

At 120vac/16 amp, the inrush spike (even with snubber) would kick off the safety functions in Plus 1PM. You'll want a contactor whether you run it on 120vac or 240vac. You can use any contactor you like (rated for the load), though. A $20 HVAC contactor off Amazon paired with a Mini 1PM Gen3 will be a really good setup for very low cost.

Thank you! I need to take the time to make sure I type exactly what I mean or else I'll steer customers in the wrong direction and this could have been a disaster for Tim. PS - Tim, you can use RC Snubber with second gen products and the 3rd gen products that don't have PM designation. You'd wire it between A1 and A2 (the line and nuetral connections on the contactor's coil)

This is a solution to remotely monitor power status using one Shelly Plus Plug and any combination of constant-powered Shelly relays or plugs. In fact, it can monitor any device that returns a valid response on HTPP or HTPPS requests. Messaging is handled via Webhook or MQTT. The message template is very flexible, allowing a generic message stating which device is down or an individual message for each device. Each device monitored can submit as many messages as required. There isn't a firm limit on the number of devices that can be monitored or the number of messages triggered when a device is determined offline. The overall script size maximum is the limiting factor. There are any number of reasons to monitor for power outages: Family members who are at risk during extreme temperatures when HVAC equipment fails. Family members who require powered medical equipment. Schools - notify parents to keep children home Businesses that rely on refrigeration or HVAC control (grocery, restaurant, hydroponics) Prerequisites: This solution assumes that both Internet connection and Wi-Fi access point are protected by battery backup. The Shelly Plus Plug hosting the script should also be protected by battery backup. The assumption is that if Internet is up and the host plug can reach Wi-Fi but cannot reach the devices monitored, the power is out. Here are full instructions for setting up the solution: https://shelly.link/usa/power-outage

Hi Tim You won't be able to synchronize the two lines to engage at once - and remember that one of the two wires is always acting as the circuit's return path, so you REALLY don't want to deenergize the two wires individually. You need to use a contactor. Nearly any Shelly product can trigger the contactor's coil. A Shelly product with the PM designation should trigger when the Sine wave crosses the zero line, minimizing the impact of inrush current from the coil.

Here's what gets me going - Plus 1PM. It has built in power measurement, over temp/current/power/voltage protection, WiFi range extender, TLS, Websockets, and JacaScript, all amazing features. The BEST feature, though, is how easy to wire. Two internally connected neutral terminals and three internally connected line terminals. I can jumper neutral to an outlet/socket, or daisy chain it (and line) to the next gang box. I can power the bottom pole of a light switch from one of the L terminals. No Wago or wire nut needed.