ggunn
PE (Electrical), NABCEP certified
- Location
- Austin, TX, USA
- Occupation
- Consulting Electrical Engineer - Photovoltaic Systems
If you must interconnect a 480V inverter to a 208V service and you want to use an autotransformer to do it, be sure that your 208V service is actually 208V, because if it's on the high side of the acceptable range at the service, the transformed voltage plus the voltage rise in the conductors may result in the voltage at the inverter being too high for the inverter to operate consistently. Isolation transformers have (or at least can have) taps where the voltage can be adjusted but autotransformers (at least the ones I have found) do not.