All the monitoring is needed until we can get the fault fixed, whatever it is.

It has been looked at and remains unresolved.

Every item including a UPS should have a maximum input current marked. In some circumstances a maximum power is acceptable instead.

Plugging both UPSs into the same socket would not be acceptable as 2700VA is more than the 2300VA available from a 230V 10A socket, before considering additional recharge current or inefficiency.

Individually they will be fine if fitted with 10A plugs, because they were fitted with 10A plugs.

Dynamic:

 

kiwifidget:

 

What about putting one between a UPS and the wall outlet? Do UPSs have the same 10A limitation?

 

 

I would expect no issues putting one on a UPS, but have never tested this.

 

UPSes are designed to power PCs, not high-load appliances.  I would imagine trying to start and run the compressor on a fridge from a UPS would be... interesting, at least for a short period of time.

You don't need a Tapo, just anything cheap you can plug in that'll stop pinging when power is removed.  An ESP32 sounds like it'd be ideal.

@neb , sorry for the confusion, I am not running any fridges or freezers off a UPS.

I have a few Tapos.

One plugged into empty socket next to freezer.

One plugged into empty socket in office, but could go before my UPS.

Others just doing Tapo stuff. 

Issues with trips on fridges or freezers are typically defrost elements, id be looking there.

kiwifidget:

 

The price of fish, in my head anyway, being that multiboards and UPSs have multiple applicances plugged in to them, thereby possibly exceeding 10A???

 

Or does it become irrelevant as a UPS wouldnt draw more than 10A regardless of what was plugged in?

 

Powerstrips have a breaker in them to stop them from being overloaded. The only exception is the double adapter which for some weird reason is still allowed to exist without overload protection in it, so nothing stopping some einstein plugging 2 heaters into one and pulling near 20A thru a 10A outlet, with nothing to stop them from it. Worse if they put it at the end of a 1mm extension cord which will nicely cook up.

Once a UPS gets near the limit, they put a 15A inlet on them, since it has to power the loads and charge up, and there will often be 15A outlets on them since that is what larger server PSUs take.

Could you run another device on a double adaptor from the same socket that can send you an offline notification?

Or could you attach a raspberry pi or similar and poll that over the internet with uptime robot or similar to detect when it goes offline?