You paid for on-grid solar, the installer left, and still lights do not run the way you expected — or the bill barely dropped. That frustration is common on farms and rural homes. The system is often working as designed, but not the way WhatsApp explained it.
This guide covers the real causes: net metering vs export-only wiring, inverter shutdown during outages, wrong meter/CT placement, and DISCOM activation delays. For policy costs on new installs, see ALMM List-II. For farm schemes, see PM-KUSUM.
Grid-tied solar is not a diesel generator. During a grid outage, most on-grid inverters turn off by law (anti-islanding). Panels in the sun will not power your home until the grid returns — unless you have hybrid + battery or a separate off-grid line.
Symptom 1: “Light nahi aati” during bijli cut
What happens
When the DISCOM line fails, the inverter detects no stable grid reference. It stops converting DC from panels to AC for your home. Reason: linemen repairing wires must not face live solar back-feed.
What farmers expect (wrong)
“Suraj hai, panel hai, fan chalna chahiye.”
Fix paths
| Option | Trade-off |
|---|---|
| Wait for grid | Zero extra cost; no backup |
| Hybrid inverter + battery | Power in cuts; higher cost, maintenance |
| Critical load backup circuit | Fans, lights, phone charge only |
| Off-grid pump branch | PM-KUSUM Component B style — separate from on-grid house |
Read: on-grid power cut — is hybrid better?
Symptom 2: Grid is on but bill unchanged
Net metering not active
You may have panels installed but bi-directional meter or net metering agreement still pending. Solar exports (or wastes) while the home runs on normal import.
Check: DISCOM approval letter, meter serial, portal login for import/export columns.
Gross metering surprise
Some states moved toward gross metering for new rooftop — you sell solar at low tariff and buy at full retail. Bill reduction looks small even when the plant runs.
Check: approval type on sanction letter — not just installer brochure.
Export-only / wrong wiring
A frequent field mistake:
- Solar AC is tied only to grid side of the meter
- Loads stay on import-only path
- Result: 100% consumption billed, solar exports separately — farmer sees “solar chal raha hai” on app but no feel at home
Fix: Licensed electrician reviews single-line diagram vs DISCOM net metering standard — often needs coupling at load bus or correct CT direction.
Symptom 3: Inverter off or blinking — user settings
- AC isolator off after service
- DC switch off
- Grid voltage too high/low — inverter protects itself (common weak rural feeders)
- Frequency trip — see inverter trip on pump for grid-quality fixes
Tip: Photograph error code from display; call brand service, not only the broker who sold the deal.
Symptom 4: Night use — solar cannot help
On-grid solar does not store energy without batteries. Night tubewell on grid will still show on the bill. Size expectations: solar offsets daytime use and net export credit if policy allows.
Step-by-step diagnosis checklist
- Grid present? If cut → expect inverter off (normal for on-grid)
- DISCOM net meter live? Import/export visible online
- Metering type — net vs gross on paper
- Wiring diagram — who installed, does it match sanction
- Daytime test — turn off heavy loads; see if import drops on meter LED/app
- Installer warranty — many disputes are activation, not panels
When hybrid makes sense for farms
Consider hybrid if:
- Daily outages > 2–4 hours and you need cooler, lights, milk machine
- Medical or drip control cannot stop
- Component C grid pump trips often — compare on-grid vs hybrid pump
Stick to plain on-grid if:
- Grid is stable
- Goal is bill savings only
- You accept no backup in cuts
DISCOM disputes
If export is shown but bill credit is wrong, document six months of readings. Rajasthan farmers: see net metering bill dispute patterns (other states similar).
New install in June 2026? Use ALMM-listed hardware or subsidy may fail — farmer impact guide. Plan pump separately if irrigation cannot depend on grid backup — solar pump bill savings.
Bottom line
- No light in outage → usually normal for on-grid; need hybrid/battery for backup
- Bill same → check net metering activation, gross vs net, wiring
- Do not guess — get diagram + DISCOM portal proof before fighting the installer
Disclaimer: DISCOM rules vary by state. Wiring changes must follow licensed practice and local standards. Ask Kisan is not an electrical contractor.
Last verified: June 2026.
Frequently asked questions
Why does on-grid solar not work during a power cut?
Standard grid-tied inverters shut down when the grid fails — anti-islanding safety stops them from feeding live lines during outages. Your panels may be producing, but the inverter will not power home loads until grid returns unless you have a hybrid inverter with battery backup or a separate off-grid circuit.
Solar is on but my home meter shows no reduction — why?
Common causes: export-only wiring (solar feeds grid but loads run only from grid), wrong CT/meter placement, net metering not activated, or high daytime load elsewhere. Ask the installer for a single-line diagram and compare gross consumption vs export on your DISCOM app.
What is the difference between net metering and gross metering?
Net metering offsets what you import with what you export (often bi-directional meter). Gross metering pays a low feed-in tariff for all solar export while you buy full retail rate for consumption — bills may barely drop. Know which approval your DISCOM issued.
Can wrong wiring cause zero use of solar at home?
Yes. If the solar output is connected ahead of the load panel or only to the grid side without coupling to consumption, the house may draw 100% from the grid while solar exports separately. A licensed electrician should verify bus coupling per DISCOM standard.
When should I switch to hybrid solar?
If frequent outages and you need lights, fans, or pump control during cuts, a hybrid inverter with battery or a dedicated backup circuit may be worth the extra cost. Compare with [on-grid vs hybrid pump guide](/blog/on-grid-vs-hybrid-solar-pump-2026) and [power-cut hybrid article](/blog/on-grid-power-cut-hybrid-better).
