I have a nickel iron battery I have chosen to put into a shed with Ventilation added for the hydrogen off gassing. I am planning to run the dc from this battery over to the soffit then across an attic space and down into a hybrid inverter that will be in my garage. I am planning to run 4/0 copper through 2” pvc conduit. Is this acceptable? I have been told must be conduit and metal conduit would be best practice but not sure if it would be deemed ok or unsafe.