The Question We Get Asked Most
Of all the questions we field from prospective customers, this is probably the single most common: "If I have solar panels, will my lights stay on during a power cut?" The honest answer for most residential installations in Assam — standard on-grid systems — is no, and understanding exactly why is one of the most important things to know before you buy.
Why On-Grid Systems Shut Off During Outages
An on-grid (grid-tied) solar system is electrically synchronised with the APDCL grid — it feeds any surplus power it generates back into the grid through your net meter, and draws from the grid when your usage exceeds generation. When APDCL's supply goes down, the inverter is required by design and by electrical safety code to disconnect and stop generating immediately. This is called "anti-islanding" protection, and it exists for a very serious reason: if your system kept generating power onto a "dead" line during a grid outage, it could electrocute utility linemen working to restore power on what they believe is a de-energised line. This isn't a limitation installers can bypass — it's a mandatory safety feature.
So On-Grid Solar Doesn't Help During Power Cuts at All?
Correct, for the standard on-grid configuration that most homes in Assam choose — its entire purpose is reducing your APDCL bill through daytime generation and net-metering credit, not providing backup power. This is exactly why we're upfront about it with every customer who mentions power cuts as a concern, since it changes which system type actually fits their needs.
What Hybrid Systems Change
A hybrid inverter system adds a battery bank and a specially designed hybrid inverter that can safely island itself from the grid during an outage — disconnecting from the dead APDCL line (maintaining the same lineman-safety principle) while continuing to power selected household circuits from stored battery charge and ongoing solar generation. This gives you both grid net-metering benefits during normal operation and backup power during outages, at a higher upfront cost due to the battery bank and more sophisticated inverter.
What Off-Grid Systems Change
A fully off-grid system has no connection to the APDCL grid at all — it relies entirely on solar generation and battery storage. This is uncommon for urban Assam homes with reasonable grid access, since it forgoes the cost benefits of net metering, but it can make sense for remote properties without a practical grid connection.
Comparing the Three Options
| System type | Reduces APDCL bill? | Works during power cut? | Relative cost |
|---|---|---|---|
| On-grid | Yes, via net metering | No — shuts off for safety | Lowest |
| Hybrid | Yes, via net metering | Yes, on backed-up circuits | Higher (battery + hybrid inverter) |
| Off-grid | No grid connection | Yes, fully self-sufficient | Highest per usable kWh |
How to Decide
If your main goal is cutting your monthly electricity bill and power cuts in your area are infrequent or short, a standard on-grid system remains the most cost-effective choice by a wide margin. If your area experiences frequent or long outages, or you run equipment that genuinely needs uninterrupted power (medical devices, a small business, work-from-home setups), it's worth discussing hybrid options and sizing the battery to your actual essential-load requirement rather than your whole house.
FAQs
Can I add a battery to my existing on-grid system later?
In some cases yes, if the existing inverter supports a hybrid retrofit or a compatible battery-ready upgrade path — this depends on your specific inverter model and is worth checking before assuming it's possible.
Is a hybrid system eligible for the same subsidy as on-grid?
Subsidy eligibility rules focus on the solar generation capacity rather than the inverter type, but battery components are generally not covered by the core subsidy. Confirm current rules for your specific configuration before finalising.
How long can a hybrid battery power my home during an outage?
This depends entirely on battery capacity and which circuits are backed up — a battery sized for a few essential circuits (lights, fans, router, refrigerator) will last considerably longer than one expected to run an entire house including ACs.