CSLB C-46 Solar ContractorPlanning and EstimatingEasy
A C-46 contractor is preparing an estimate for a residential PV system. The client has specifically requested a system that can provide backup power during grid outages. Which of the following components would be a necessary addition to a standard grid-tied PV system to meet this requirement?
- ARapid Shutdown Device (RSD)
- BNet Metering-Compatible Inverter
- CModule-Level Power Optimizers
- DEnergy Storage System (Battery)
Show answer & explanationAnswer & explanation
Correct answer: D. Energy Storage System (Battery)
To provide backup power during a grid outage, a solar PV system requires an energy storage system (battery) to store excess solar energy and discharge it when the grid is down. Standard grid-tied systems shut down during outages for safety.
Why the other options are wrong
- A. RSDs are for firefighter safety and rapid de-energization, not for backup power.
- B. A net metering-compatible inverter allows energy export to the grid but does not inherently provide backup power during an outage.
- C. Power optimizers improve module performance and shade mitigation, but do not provide backup power.
Backup Power Components
Specific hardware required in a PV system to enable power delivery during grid outages.
- Batteries are central to providing backup power.
- Hybrid inverters manage both grid-tied and off-grid operations.
- Automatic transfer switch (ATS) isolates the home from the grid during outages.
Memory trick: Batteries Store Power for Outages.