I just installed a mini-split A/C system. It is 2 outdoor compressor units and 7 indoor head units. (I did 95% of the install myself, toot toot)
It was working great, but the weather had been unseasonably mild until now. (Install was done May 1, and then thru June 30, 2018, in Baltimore, MD, we had nothing but cool temps and rain)
Recently, i.e. last two days, we've been hit with a heat wave.
Also, recently, I've had three "brownout" events where the lights flickered, and power cut out in the house long enough to disrupt computers, tvs, etc. The first of these events was pretty coincidental with the start of the heat wave.
The circuit breakers did not trip. None of them, not the individual breakers or the mains.
How can I tell if my AC units are causing this or if it isn't just a general service problem from our provider?
I've tried the following:
- Shut off all the A/C units and wait to see if the flicker happens. (this is tough though since you can't prove a negative)
- Called my provider and asked them to check our lines. They reported no outages or brownouts in our area
- Checked all the circuit breakers
Edit: Additional specs
My electrical service specs are
- 200 Amp main
The breakers are
- 1 X 50A line for the dryer
- 1 X 40A line for the stove
- 3 X 30A lines for the 2 A/C compressors and something else, I'm not sure what. Clothes washer maybe?
- 29 X 15A lines for lights/outlets
That seems like a lot -- but there are still two empty slots in the panel. Although I know I shouldn't have the panel maxed out.
I'm trying to figure out how to do a load calculation to get a better idea but haven't found very good instructions on that.
Edit Spoke with neighbors in my area. There are multiple reports of lights flickering like I experienced. I'm chalking this up to the utility provider having trouble handling the spike in load this week. Also, I'm gonna buy a couple of UPSes for sensitive devices in my home.
I realize these anecdotes from my neighborhood don't prove for certain that my new A/C units are not the problem. When I am able to, and get the equipment to, perform amperage measurements, I'll take that advice and get detailed electrical information. I'd like to have that information for myself, at any rate. It seems like a good thing for any homeowner to know about their home.