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Re: Is the circulator pump too powerful?

The Taco pump for the 3rd floor has an internal flow check which is stuck open or has some debris in it. It’s in (or should be) the discharge side of the pump. Fix that and your problem will be resolved.

Ironman

Re: Off grid heating/ac minisplit efficiency

Minisplits all have power factor correction on the input, not just a simple rectifier. The power factor correction ic needs to sync up to the grid and expects a reasonable sine wave to run properly. Some have better control and will run with noisy power, not all.

Most modern PV inverters are sine wave. The ones I've put a scope on (Outback and Schneider SW) had very clean output. Can't say the same thing about generators though.

Since AC runs mostly during the day in the summer and usually when there is a lot of sun, the minsplit will be running of the PV inverter. I don't see power quality being an issue as long as the inverter has sufficient output.

Kaos

Re: What was the best MacGuyver moment you actually saw on a job site?

Many moons ago a friend of mine's furnace stopped running in the middle of winter. Culprit was a blown transformer.

Late in the evening with everything closed. Luckily he had a pair of older desk lamps with 12V bulb and transformer in the base. Wired two of them in series for 24V, hooked it up to the furnace and fire right up. Kept it going till the replacement part arrived.

Kaos