Why Add the Eaton 3S UPS to your Tesla Powerwall Setup?

Why Add the Eaton 3S UPS to your Tesla Powerwall Setup?

Eaton UPS - https://amzn.to/3XGVvMw

The Tesla Powerwall 2 (PW2) is excellent protection against grid power outages, yet its design does require an additional Uninterruptible Power Supply (UPS) for any devices that are sensitive to even extremely brief power breaks.

While your fridge, microwave, most lights, and other devices will likely not notice the 300-2000 millisecond relay switch-over in case of a power outage, your sensitive electronics certainly will. In fact, only a few Hertz cycles loss will cause anything CPU related to fail.

Thus the need for at least a -short term- UPS to get sensitive electronic devices 'over the hump' of the power outage to final relay 'snap' into the internal house power grid and PW2 power feed. So far, so good. Almost any UPS can fill that bill and, in fact, since it is only needed for a second or two, the battery power for most are severe overkill for the task they perform while supporting the PW2.

However, if the PW2 is at 100% charge while the sun is shining and the user also has solar panels, the PW2 will attempt to 'turn off' the inverters for those solar panels once inside the internal house power grid (which the relay broke from the grid operator no longer providing power). In order to do this, the PW2 will raise the Hertz cycle (in the US) from 60 to 65.

The problem is that MOST UPSs will only see power coming from the outlet as 'good' when it is 60 Hertz plus or minus THREE Hertz (thus 57-63 Hertz). Thus, when the PW2 is 100% charged and in a Backup situation with no grid input and solar panels that need to be inhibited, the PW2 will raise the frequency to 65 Hertz to inhibit the solar inverters - this power will then be considered 'bad' power to those UPSs. The UPSs will then simply run on their own battery power until they run out and the devices behind them will die at that time. All because they see power at 65 Hertz as unacceptable.

Read more about this and what you can do here:
https://www.vcloudinfo.com/2022/10/why-i-added-the-eaton-3s-ups-to-my-tesla-powerwall-setup.html

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