I guess you are talking about 220V line for your property. If your output reading is really 150V that is dangerously low. If you reconnect the Trap for only the Air Conditioning, the 9KVA available should be sufficient to maintain the necessary nominal voltage. Of course, it measures what happens with the line voltage available for the rest of the equipment without the connected connection for the entire property.
The first thing we should know is, what is the input voltage ?, because assuming that the elevator is doing well, it should be less than 80 volts, in these conditions cut the current and start crying, because it has no solution, but if It's bigger than the elevator gives you, throw it away. and find another one. From there you can comment.
Your question of using it only for AA. It makes no sense because it will end up burning. luck