PWDickerson
Senior Member
- Location
- Clinton, WA
- Occupation
- Solar Contractor
Does anyone ever design a means of disconnecting a PV system at night to avoid transformer standby losses? The question came up on a recent project where we have multiple single phase 240V inverters feeding a 277/480V service. There is a 75 kVA step-up transformer in the system that consumes power all night long. It would have been nice to install a few SMA Tripower inverters and eliminate the need for the transformer, but due to an incentive structure that favors locally made equipment, we were limited in our inverter choices. Have others run into this issue?