Genset install. Electrican surged house. Questions

Previous owner of my current house had the same problem. Generator install company paid to replace two 1-year old AC units and some other stuff.

So, it happens. Insist it gets handled properly and it likely will. Maybe have a third party come to inspect things. Any residential/commercial electrician should be able to handle that.

He most likely fed power through the ground and sent 240v through your house where only 110v should be, overpowering most of your electronics. Hence the low voltage transformer being friend and the light (presumably that were on) blew.

Now he is talking about the loose ground “being left loose” because he talked to someone that knows what happened and wants to come clean it up first. Have someone else inspect it too just to have documented proof in case sensitive electronics need repair / replace.

A/C should be ok, changing bulbs will fix everything else, fridge may need repair, but most everything else should be ok. The wire doesn’t care what the voltage was (it should be rated to at least 600v) it only cares about amperage and most things (that blew) likely protected that.

In that case DV is probably right and he only sent it through one side of the panel.

Update. We replaced the attic air handler/furnace and the contactor in the outside condenser unit.

We used a third party electrician who determine that an open circuit in the new generator caused an overload or surge in the 120V side.

So the ac unit came with the house and is about 10 years and the generator company may want to depreciate it. To be determined.

this is what happens for going cheap and not using a real dealer. Now its gonna cost even more to fix