When considering rooftop solar, one of the most critical decisions is selecting the right system topology: On-Grid, Off-Grid, or Hybrid.
1. On-Grid Solar Systems (Grid-Tied)
On-grid systems are connected directly to the local electricity grid through a bidirectional net meter.
- How it works: Daytime electricity generated by the panels powers your home first. Any surplus is exported to the grid, earning energy credits. At night, you draw power back from the grid.
- Pros: Lowest initial capital cost, shortest payback period (typically 3 to 4 years), and 100% eligibility for the PM Surya Ghar subsidy.
- Cons: Shuts down automatically during power cuts to protect grid line workers (anti-islanding safety).
2. Off-Grid Solar Systems
Off-grid systems operate completely independently of the electricity distribution grid.
- How it works: Solar panels charge a deep-cycle battery bank during the day. Inverters draw power from the batteries to run household or farm appliances.
- Pros: Total energy independence; ideal for remote farmhouses, pump sheds, and areas with no grid access.
- Cons: Higher initial cost due to battery banks, battery replacement needed every 5 to 7 years, and generally not eligible for residential rooftop subsidies.
3. Hybrid Solar Systems (The Best of Both Worlds)
Hybrid systems combine grid connectivity with battery storage.
- How it works: Solar energy runs your home and charges the battery bank. Excess daytime power is exported to the grid for net-metering credits. When a power blackout occurs, the system switches in milliseconds to battery power.
- Pros: Continuous power during blackouts plus net-metering electricity bill savings.
- Cons: Moderately higher initial investment than simple on-grid setups.
Visit Powerr Technologies at our Srirangapatna branch on KRS Main Road to inspect live working demonstrations of both on-grid and hybrid hardware.