UTS10BI when a circuit is set to "either" how does it decide UPS or Gen?

[Anonymous user]

I ran a good test this week-end with the UTS10BI and the Honda EU2000i. I ran the house for about 30 minutes on the generator. I noticed something unexpected for what I thought would happen. When I switched off the main breaker to simulate a power outage, the UTS automatically switched over to the UPS for circuits defined as "either" just great. Then I fire up the EU2000i and plugged it in and a few seconds later, the UTS switched to Generator. All is great and I'm a very happy camper.

What caught my eye as I was looking through the circuit's status display on the UTS was that the circuits defined as "either" were still running through the UPS, while the circuits defined as "Gen Only" were running on the Generator. All this is good & ok, but I would have expected the UTS to switch the circuits defined as "either" over to the generator.

I performed another test. With both the UPS on-line and the Generator running & plugged in (on-line), I again turned the main breaker off. There was again a few seconds delay & everything powered on just Great, Yea! However, this time when I reviewed the circuit's status display, all the circuits where running on the generator. The "either" circuits this time were not running on the UPS, but were running on the generator.

My question is, How does the firmware determine when a circuit defined as "either" gets to run on UPS or Generator?

The manual doesn't seem to go into any kind of explanation on this depth of a level.

I prefer to have all the circuits running through the generator once it's plugged in to save the UPS, but it seems that this may not always be the case.

A follow on question is, Will the UTS switch a circuit that is set to "either" from Generator to UPS if the UTS senses that it's going to run into a generator overload situation?

Thx so much!

-Todd

[BillP · Accepted solution]

i looked at this and came to the conclusion based on discussions here that the generator is always the primary and if it becomes close to overloading, the circuit will switch to the secondary source, i.e. the UPS in your case. based on your testing results, i am not 100% sure what happened there but the UTS somehow decides whats best. beyond that, i am just not sure but on your follow up question, the answer is yes as well.