Why is it so expensive to modify a load bank in the field?

Not all load banks have the same configuration. With most industrial electrical equipment it takes more time to do a modification in the field because the equipment has to be disassembled and then reassembled. Being that service technician is outside versus in the factory where there are more resources and a good working environment. It is easier to do initial installations at the factory and product should be sold as much as possible during the quoting stage.