MAINTENANCE · GUJARAT
Solar Installed but Bill Still High in Gujarat, Causes and Fixes
Solar installed but your DGVCL bill is still high. Nine causes, from fixed charges to a new AC or tripping inverter, checked against 4.2 units per kWp a day.
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If your solar is installed but the bill is still high, the cause is usually one of three things. Your home now uses more than the system makes, the net meter is not yet billing as net, or the system is making fewer units than it should. In Bharuch a healthy system averages about 4.2 units per kWp per day, so a 3.3 kWp system should make roughly 420 units a month, and checking your inverter and bill against that number usually shows the reason within ten minutes.
What a normal bill looks like after solar
Solar removes the energy charge, not the whole bill. Fixed charges stay on every DGVCL bill whether you use one unit or a thousand. Duty on whatever energy you still draw stays too, and so does meter rent where it applies. A well-sized system gives you a small bill, not a zero bill.
Imran Sheikh in Huseniya Society, Bharuch, had a ₹3,200 bill that fell to ₹120 after we installed a 4 kW system. That ₹120 is what a near-zero solar bill looks like in practice.
It also helps to know how net metering counts. Within a billing period, every unit you export cancels one unit you import, at full value. The ₹2.25 rate applies only to the surplus left over after all imports are cancelled. Many owners believe their daytime export earns ₹2.25 while their night-time AC costs ₹8 a unit. That is not how the DGVCL bill works inside a billing period. The full logic, with a May and July bill worked out, is in DGVCL net metering in Gujarat.
Check generation first
The inverter tells you how many units the panels made. Most inverters show today’s units and lifetime units on the display, and most also have a phone app when the Wi-Fi logger is connected. Note today’s units at sunset for a week, then compare them with this table.
| Array size | Average day (4.2 units/kWp) | Clear May day (about 5.2) | Cloudy July day (about 3.0) | Average month |
|---|---|---|---|---|
| 2.2 kWp | ~9.2 units | ~11.4 units | ~6.6 units | ~281 units |
| 3.3 kWp | ~13.9 units | ~17.2 units | ~9.9 units | ~421 units |
| 4.4 kWp | ~18.5 units | ~22.9 units | ~13.2 units | ~562 units |
| 5.5 kWp | ~23.1 units | ~28.6 units | ~16.5 units | ~702 units |
| 6.6 kWp | ~27.7 units | ~34.3 units | ~19.8 units | ~843 units |
These figures are for a clean, shade-free roof in Bharuch. A fully overcast day in the monsoon can fall well below the July figure.
If your daily units are close to the table, the system is healthy and the cause is on the consumption or billing side. If they are well below it on clear days, the cause is on the roof or in the inverter.
Next, take your last few bills and write down the import and export readings. Your real household consumption for the period is generation minus export plus import.
Nine causes, how to check each, and the fix
| Cause | How to check | Fix |
|---|---|---|
| Fixed charges and duty | Energy charge near zero, fixed amounts still on bill | Nothing to fix, this part stays |
| Consumption has grown | Consumption formula shows more than last year | Add panels if roof, inverter and sanctioned load allow |
| Monsoon months | Daily units drop in July and August, recover by October | Judge the system over a full year |
| Net meter not fitted or not billed as net | Bill shows one reading, or zero export | Chase inspection and meter change with DGVCL |
| Surplus at ₹2.25 across periods | Sunny periods show surplus credit, cloudy ones a bill | Size to your use, not to your roof |
| Inverter tripping or offline | Gaps in the app graph, error codes, blank display | Installer check, DGVCL complaint for high voltage |
| Dirty panels or new shade | Low units on clear days, shadow on panels at 10 am or 3 pm | Clean properly, move the tank or the panels |
| Wrong meter reading | Bill reading does not match the meter display | Photos of the meter, complaint at the subdivision |
| Generation below design | Clear-day units well below the table even when clean | Installer inspection of strings, tilt and sizing |
Your home now uses more
This is the most common cause we see. A system sized for last year’s ₹3,000 bill cannot cover this year’s ₹5,000 bill. A 1.5 ton AC running through summer nights can add 200 to 300 units a month, depending on its star rating and thermostat setting. A new family member, a second fridge or an electric scooter charged at home adds more. Our post on what size solar system your home needs shows how to size from the bill and the number of ACs.
Monsoon months
June to September brings heavy rain and cloudy weeks along the Narmada belt, and output in July and August falls well below the yearly average. Your AC load does not fall as much. A small bill in these months is normal. Compare each month with the same month last year rather than with April.
The net meter is not fitted yet, or not billed as net
Until DGVCL fits the bi-directional meter, your export has nowhere to be counted. Some older meters even register exported power as consumption, which pushes the bill up. The first bill after a meter change can also still be based on the old meter. If your bill shows no export reading, check where your application stands. Our guide to checking your DGVCL solar application status explains each stage.
Surplus credited at ₹2.25
Surplus left at the end of a billing period earns about ₹2.25 a unit and does not carry forward. A home that exports heavily in March to May and imports heavily in the monsoon ends up with credits worth little and bills at full tariff. Night-time AC use is only a problem when total generation in the period cannot cover it.
Inverter tripping or offline
On streets where many homes export at midday, grid voltage can rise above the inverter’s limit. The inverter then stops to protect itself and restarts later. In the app, this shows as the daily curve dropping to zero around noon. Frequent trips need an installer visit, and if the voltage itself is high, a complaint to DGVCL to check the transformer. Also check that the app is not simply offline. The logger loses connection after a router change, and the app then shows zero while the inverter display shows normal units.
Dirty panels or new shade
Dust, soot near the GIDC estates and bird droppings all cut output, and our cleaning and maintenance guide covers the safe method. New shade is easy to miss. A new water tank, a neighbour’s added floor, a dish antenna or a growing tree can shade one panel for part of the day, and one shaded panel pulls down the whole string. Walk onto the roof at 10 am and 3 pm and look for shadows on the glass.
Wrong meter reading
The net meter display cycles through several readings, and a reader can note the wrong one. Photograph both import and export on your reading date and compare them with the bill. If they do not match, take the photos and the bill to your DGVCL subdivision office.
Generation below design
A loose connector, a failed string, panels facing the wrong way or a poor tilt all lower output. So does a system undersized from the start, where the size was chosen from the budget or the roof rather than the bill. If clear-day units stay well below the table after a proper clean, call your installer.
A worked example, a 3.3 kWp home that added an AC
Take a family in Bharuch whose bill was ₹3,000 a month, about 375 units. Following the calculator, they installed 3.3 kWp, six 550 W panels on a 3 kW inverter. It cost ₹1,65,000 before subsidy and ₹87,000 after the ₹78,000 subsidy. The system averages about 421 units a month, and in the first year their energy charge was near zero in most months.
The next summer they added a 1.5 ton AC in a bedroom. The figures below use 5.2 units per kWp per day for May, 3.0 for July and ₹8 a unit.
| May, before new AC | May, with new AC | July, before new AC | July, with new AC | |
|---|---|---|---|---|
| Solar generation | 532 units | 532 units | 307 units | 307 units |
| Household consumption | 470 units | 690 units | 380 units | 520 units |
| Net result | 62 units surplus | 158 units import | 73 units import | 213 units import |
| Energy charge at ₹8 | ₹0 | about ₹1,264 | about ₹584 | about ₹1,704 |
| Surplus credit at ₹2.25 | about ₹140 | ₹0 | ₹0 | ₹0 |
Nothing is wrong with the system. The inverter still shows about 17 units on a clear May day, which matches the table. The bill went up because consumption did.
The fix is more capacity. With the new AC, their use now sits close to a ₹4,000 to ₹4,500 bill, which the calculator matches with 4.4 kWp. At that size, May generation rises to about 709 units and covers the 690 used. July generation rises to about 409 units, leaving 111 units to pay for, about ₹888.
Two panels more usually means a larger inverter as well, because a 3 kW inverter is matched to about 3.3 kWp. The subsidy is already at its ₹78,000 cap, so the added panels carry no further subsidy. The extra capacity usually needs DGVCL approval and must fit your sanctioned load. An add-on is priced per site, so send us your details on WhatsApp for today’s figure.
How we catch this for our customers
Every residential customer of ours gets a monthly generation report on WhatsApp. When a month comes in below the same month last year, we call before the bill arrives. Our five years of free maintenance include a quarterly check by our own team, covering generation against expected output, the inverter’s error log, panel surfaces, structure, wiring and earthing.
Most high bills we look into turn out to be consumption growth, and the report makes that clear quickly. The rest are usually a tripping inverter, a new shadow or a net meter still waiting on DGVCL. We follow the same routine on every roof, from Bharuch town and the villages to jobs across South Gujarat.
Talk to us
Send a photo of your last two DGVCL bills and your inverter’s daily units on WhatsApp at 98241 95027, and we will tell you where the units are going. Check what your system should produce on the calculator, or visit the shop at Mehfuz Complex, opposite Patel Welfare Hospital, Bharuch.
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Want the number for your own roof?
Send your last electricity bill on WhatsApp. We reply the same day with a size and a price, and the site visit is free.
Questions people ask
Why is my electricity bill not zero after installing solar?
Solar removes the energy charge, not the whole bill. Fixed charges stay on every DGVCL bill, and so does duty on any energy you still draw from the grid. A well-sized system brings the bill down to a small amount. One of our customers in Bharuch went from ₹3,200 to ₹120 a month. If your bill is far higher than that, check generation and consumption.
How many units should my solar system generate per day in Gujarat?
In Bharuch and most of South Gujarat, a clean, shade-free system averages about 4.2 units per kWp per day across the year. A 3.3 kWp system should make roughly 14 units on an average day, around 17 on a clear May day and closer to 10 on a cloudy July day. Compare the inverter's daily units with these figures over a week, not a single day.
Is the ₹2.25 export rate the reason my solar bill is high?
Usually not. Within a billing period, every unit you export cancels one unit you import at full value. The ₹2.25 rate applies only to surplus left after all imports are cancelled. It matters when a sunny period leaves a big surplus and a cloudy period leaves a bill, because the surplus does not carry forward. A system sized to your use keeps that loss small.
How do I read import and export on my DGVCL net metering bill?
A net metered bill shows two readings, one for units imported from the grid and one for units exported to it, and bills the difference. Write both down for your last few bills. If the bill shows only one reading or no export at all, the net meter may not be fitted yet or the billing may not have been updated after the meter change.
Can I add more panels to my existing solar system?
Often yes, if the roof has space, the inverter has headroom and your sanctioned load allows the larger size. A 3 kW inverter is matched to about 3.3 kWp of panels, so adding panels often means a larger inverter too. The added capacity usually needs approval from DGVCL. If you already received ₹78,000, there is no further subsidy on the extra panels.
My inverter app shows zero units. Has my solar stopped working?
Not always. The app depends on the Wi-Fi logger, and it shows zero when the logger loses the connection, for example after a router change or a new Wi-Fi password. Check the display on the inverter itself. If the display shows today's units, the system is working and only the app needs reconnecting. A blank display in daylight needs a call to your installer.