The bills
Monthly totals or interval data — the load profile, DISCOM and category come straight from them.
DESIGNED IN INDIA · FOR SOLAR EPCs & INSTALLERS
How much solar
How much storage
What it saves
Ingro SIMS turns a customer’s bills into a costed, defensible solar + storage recommendation — in minutes, under your name.
WHAT YOU PROVIDE
- 12 months of bills
- Site location & area
- Existing solar, if any
SIMS DETERMINES THE OPTIMAL SIZE
RECOMMENDED OPTIMAL CONFIGURATIONSAMPLE FIGURES
2.4 MWp solar + 1.8 MWh battery
SAVES
₹0.0 Cr / yr
BILL TODAY → AFTER
₹0.0 → ₹0.0 Cr
BATTERY PAYBACK
0.0 yrs
Feasibility reportFinancial modelComparison sheet
Trusted by
UPDATE
Effective 1 April 2026, Maharashtra requires energy storage with solar installations above 100 kW — 50% of solar capacity, for two hours. Further states are expected to follow.
HOW IT WORKS
From twelve bills to a signed proposal.
SIMS follows the same path an engineer would — it just walks it in minutes, and never skips the arithmetic.
- 1
Create a project
One project per site or consumer. Bills, tariff choices, assumptions and every analysis run are saved to it as you go.
- 2
Feed it the bills
Twelve months of bills, or interval meter data where available. The consumption pattern, the DISCOM and the tariff category are read from them.
- 3
Point at the site
Location and available roof or land area. SIMS derives the generation profile from NASA satellite irradiance — existing solar sharpens it further.
- 4
Confirm the tariff
The DISCOM’s time-of-day zones, seasonal rates and demand charges come from the built-in library — current with every revision.
- 5
Read the recommendation
Every solar × battery combination is simulated against the customer’s year; the build with the fastest return rises to the top.
EPCs & installers
A proposal prepared in the first meeting, issued under your brand.
Energy consultants
Any quotation re-priced on the customer’s own data, before it is accepted.
C&I consumers
The rooftop case checked independently before signing anything.
EVERY STUDY RESTS ON THE SAME THREE INPUTS
The site
Location and usable area; satellite irradiance fills in everything else.
Existing generation
Where solar is already installed, its output sizes storage against reality.
INSIDE THE SIMULATOR
Three ways to simulate. One search for the best.
Every mode runs the customer's actual year hour by hour — dispatch, efficiency, depth-of-discharge and all. They differ only in what they optimise.
The baseline
Solar only
Sizes PV for maximum self-consumption with minimal wastage — the headline savings before storage enters the picture.
- Self-consumption limit
- Wasted-solar warning
The full case
Solar + BESS
Sizes solar and storage jointly against time-of-day zones — charging on midday surplus, discharging into the evening peak.
- ToD arbitrage
- Peak shifting
- Efficiency losses modelled
For demand-heavy bills
BESS peak-shaving
Sizes a battery that flattens demand peaks — standalone, or alongside solar already on the roof.
- Demand charges
- Retrofit-friendly
THE SEARCH BEHIND THE RECOMMENDATION
SAMPLE SWEEP · ILLUSTRATIVE VALUES00.61.21.82.43.03.6
08.96.45.14.64.95.87.4
0.68.15.64.43.94.25.06.6
1.27.65.14.03.43.74.56.1
1.87.34.93.73.23.54.45.9
2.47.45.03.93.43.84.76.3
3.07.85.44.23.84.25.16.8
SOLAR CAPACITY, MWp → · ↑ BATTERY, MWh
Ranked by your objective:
- Lowest bills
- Least grid use
- No solar wasted
- Most solar used
DESIGNED IN INDIA, NOT ADAPTED TO IT
It knows what your DISCOM actually does.
Global sizing tools require Indian tariffs to be built by hand. Ingro SIMS is designed around India’s regulatory structure — DISCOM by DISCOM — and maintained as it changes.
ONE DAY UNDER A TIME-OF-DAY TARIFF
MSEDCL-STYLE ZONES · ILLUSTRATIVE RATESOff-peak₹6.1
Normal₹7.4
Peak₹9.1
Normal₹7.4
Evening peak₹9.3
Off-peak₹6.1
00:0006:0009:0012:0018:0022:0024:00
REGULATION MOVES. SIMS IS MAINTAINED WITH IT.
Apr 2024
Time-of-day tariffs become universal for C&I consumers across India.
Every year
DISCOM tariff orders revise rates, zone boundaries and charges.
Apr 2026
Maharashtra mandates storage with solar projects above 100 kW.
Next
Further states are expected to follow. Each change is encoded as it takes effect.
Your DISCOM is built in
Time-of-day zones, seasonal rates and demand charges for DISCOMs across India — MSEDCL to BESCOM. SIMS identifies the DISCOM from the customer’s bill and applies its rules; nothing is rebuilt by hand.
Current with every revision
Tariff orders, ToD revisions and storage mandates are encoded as they take effect — so a study priced today reflects the rules in force today.
Numbers that withstand review
Savings are computed the way the bill is charged — slab by slab, season by season — and every assumption is carried into the workbook, where it stands up to independent scrutiny.
WHAT YOU GET
What a study delivers.
Everything below is generated from the study — sized, costed and branded for the customer.
sims.ingroenergy.com/sizing-studioSAMPLE DATA
Today
grid only
₹3.9 Cr / yr bill
- Saves
- —
- Battery payback
- —
Solar only
2.4 MWp
₹3.1 Cr / yr bill
- Saves
- ₹80 L / yr
- Battery payback
- —
Solar + battery
2.4 MWp + 1.8 MWh
₹2.8 Cr / yr bill
- Saves
- ₹1.1 Cr / yr
- Battery payback
- 3.2 yrs
Sized to the objective
Select the customer’s objective and the recommended configuration follows it — the ranking always serves the goal, not a single metric.
The complete financial case
Capital cost, annual savings, payback and lifetime return — in rupees, computed against the customer’s actual bill. Ownership and PPA structures, both.
Today vs Solar vs Solar + Battery
A single side-by-side comparison of the current bill, solar, and solar with storage — the summary a decision is made on.
A report issued under your brand
A branded feasibility report for the customer, and a working financial model their finance team can verify line by line.
Results in minutes — a proposal in the first meeting, not the following week.
BENCHMARK ANYTHING
Benchmark any quotation.
Enter any proposed configuration — a competitor's quotation or the customer's own estimate. SIMS evaluates it on the same consumption data and the same tariff, alongside the recommended build. The comparison speaks for itself.
ANNUAL SAVINGS, COMPARED
SAMPLE FIGURESSIMS recommended · 2.4 MWp + 1.8 MWh₹1.1 Cr
Quoted elsewhere · 3.0 MWp + 1.0 MWh₹96 L
Designed in India, for Indian regulationThe customer’s own consumption dataNASA satellite irradiancePublished DISCOM tariffsEvery figure traceable in the workbook
Evaluate it on a live project.
A consultant-grade feasibility study, produced in minutes. Launch offer: 5 projects included for the first 1,000 accounts.