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EMERGEDPower Distribution

For grid-connected RMG & industrial plants

Hybrid Solar

Grid savings by day. Battery backup through load-shedding.

Grid-tied rooftop solar with LFP storage and a hybrid inverter that switches over in under 20 ms. Your lines keep running when the feeder drops, and your cheapest unit is always the one on your roof.

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1.8 MWp + 1 MWh hybrid · Gazipur

Typical size
50 kWp – 3 MWp
Switchover
< 20 ms
Grid bill reduction
25 – 40%
Payback
4 – 6 yrs

Who it's for

Grid-connected plants that can't afford to stop.

Hybrid makes sense when outages cost you production and the grid bill is big enough to matter. If two or more of these sound familiar, it's worth a survey.

Stable feeder and daytime-only load? A net-metered roof without batteries usually pays back faster.

Compare net-metering

  1. 01

    You lose batches to load-shedding

    Dyeing, washing, knitting and injection lines that can't restart mid-cycle without scrap.

    3+ outages a week

  2. 02

    Your gensets run every day

    Diesel at Tk 28–32 a unit is the most expensive electricity in your plant.

    > 2 h genset runtime / day

  3. 03

    The grid bill is a board-level number

    Plants paying lakhs a month on DESCO, DPDC, REB or PBS industrial tariffs.

    Bill > Tk 5 lakh / month

  4. 04

    Buyers audit your energy

    Brands asking for renewable share, Scope 2 data and verified CO₂ reporting.

    Sustainability audit due

System architecture

One inverter. Three sources. No manual switching.

Solar, battery and grid meet at a single hybrid inverter and your main distribution board. The controller decides where every kilowatt goes.

Grid-tied hybrid plant with LFP storage and net-metering or zero-export at the MDB.
  • 01Solar arrayServes your loads first, every daylight hour, before a single unit is imported.
  • 02Hybrid inverter / PCSOne controller decides, millisecond by millisecond, where every kilowatt goes.
  • 03LFP batteryStores surplus, shaves the evening peak and holds a reserve for outages.
  • 04Grid tie & MDBTops up demand, accepts export under net-metering, and disconnects safely when the feeder fails.

How the energy flows

Four moments in a factory's day.

Pick a scenario — or play a full day — to see how solar, battery and grid trade places from the morning shift to the night shift.

Day · 08:00 – 17:00

08:00 – 17:00

Sun covers the shop floor

Solar carries most of the daytime load. Surplus charges the battery, and the grid only tops up what the roof can't cover.

Solar share of load
60–75%
Battery
Charging
Grid import
Low

What the controller does

  • Solar serves loads before any grid import
  • Surplus charges the battery to full
  • Holiday surplus exports via net meter or is curtailed

Net-metering

Friday's surplus becomes Sunday's credit.

When the plant is closed and the roof keeps generating, a bidirectional meter credits exported units against what you import — so holiday sunshine isn't wasted.

  • Capacity is generally capped at 70% of your sanctioned load
  • Where a feeder can't accept export, the plant runs zero-export instead
  • Year-end settlement of unused credit follows your utility's rules

  1. Apply01

    We file with your utility — DESCO, DPDC, REB or PBS — with the single-line diagram and equipment certificates.

  2. Inspect02

    Utility engineers check protection, anti-islanding and the metering point.

  3. Meter03

    A bidirectional meter records imported and exported units separately.

  4. Net04

    Each billing month, exported units are subtracted from imports; unused credit carries forward.

Example month · 1 MWp hybrid plant

Units imported from grid
1,40,000 kWh
Units exported · Friday & holiday surplus
− 9,500 kWh
Net units billed
1,30,500 kWh

export credit this month at Tk 12 / kWh

Tk 1.14 lakh

Specification

Built to switch in milliseconds and last 25 years.

Tier-1, IEC-certified equipment specified for Bangladesh's heat, humidity, dust and cyclone-season wind — and for the grid codes your utility inspects against.

Download Capability Profile
Hybrid solar system specification
Solar array
ModulesTier-1 mono PERC / TOPCon bifacial, 550–620 WpIEC 61215 / 61730, PID and salt-mist tested
MountingClamp-on rails for metal sheet; ballast or anchors for RCC
Wind designBNBC 2020 basic wind speed for the district
Hybrid inverter / PCS
Rating50–500 kW per unit, paralleled to 3 MW
Backup transfer< 20 ms, grid-formingWithin PLC and VFD ride-through tolerance
Grid protectionAnti-islanding to IEC 62116, zero-export control
Efficiency97–98.5% (European weighted)
Battery storage
ChemistryLiFePO₄ (LFP), cabinet or containerised
Capacity100 kWh – 2 MWh, 0.5C – 1C
Cycle life6,000+ cycles at 80% depth of discharge
SafetyCell-level BMS, thermal management, fire detection and suppression
Grid interface & controls
MeteringBidirectional net meter or zero-export relay
SwitchingMotorised grid contactor and critical-load panel
EMS modesSelf-consumption, peak shaving, backup reserve
MonitoringString-level SCADA, 4G / Ethernet, monthly savings and CO₂ report
Warranties
Modules12-yr product · 30-yr linear performance
Inverter / PCS5 yrs, extendable to 10
Battery10 yrs or 6,000 cycles
Workmanship5 yrs including leak-proofing

Savings estimator

What would a hybrid plant save you?

Your monthly bill and usable roof area give an indicative size, monthly saving and payback. The survey turns it into an engineered proposal.

Solar savings estimator

3 inputs · 30 seconds
Tk/ month

From your DESCO / DPDC / REB / PBS bill

sq ft

Shade-free roof, excluding skylights and plant

Connection type

Your indicative system

Recommended system size

—

Based on bill and roof area

Monthly savings

—

Payback period

—

Enter your bill and roof area to see a system size, monthly savings and payback. Nothing is sent until you ask for a proposal.
How we estimate

Tk 12/kWh grid tariff (Tk 30/kWh diesel for off-grid), 1,300 kWh/kWp/yr yield, 90 sq ft per kWp, 70% daytime load. Indicative only — not a quotation.

Gazipur · March 2025

Case study · Hybrid

1.8 MWp hybrid rooftop for a knit composite plant

Result
31%
lower grid bill
Sector
RMG & Textiles
Client
Knit composite manufacturer

The challengeThree sheds, 212,000 sq ft of corrugated roof, and six to nine hours of monthly load-shedding that stopped dyeing lines mid-batch. Diesel backup was costing more per unit than the grid.

The resultThe dyeing lines now ride through outages on battery, diesel runtime is down 78%, and the plant's monthly grid bill fell by 31% in the first full quarter.

Read the full case study

FAQ

Hybrid questions from plant engineers

Battery runtime, switchover, net-metering, heat and safety.

Ask an engineer

Hybrid batteries are sized for critical loads, not the whole plant. A typical design carries dyeing, washing or compressor lines for one to two hours — enough to finish a batch or bridge most load-shedding blocks — with the genset as automatic backup beyond that. A 1 MWh bank at 80% depth of discharge supplies 400 kW for about two hours.

The inverter transfers in under 20 ms, which is inside the ride-through tolerance of most PLCs, VFDs and control systems. By comparison a diesel genset takes 8–12 seconds to start and pick up load, which is what drops lines today.

No. Net-metering lets you earn credit for exported surplus, but a hybrid plant can also run in zero-export mode, using or storing everything it generates. Our Gazipur knit composite client runs zero-export because its feeder can't accept back-feed.

Usually, yes. An AC-coupled battery and hybrid PCS can be added to an existing grid-tied array without replacing modules or string inverters. We survey the existing protection and switchgear first.

With active thermal management keeping cells near 25 °C, LFP systems are designed for 6,000+ cycles — roughly 12–15 years of daily cycling. Without cooling, sustained temperatures above 35 °C shorten life, which is why battery bays are ventilated or air-conditioned.

Indicatively Tk 80,000–90,000 per kWp including storage sized for critical loads, with payback of 4–6 years from bill and diesel savings. Under a RESCO lease or PPA there is no upfront capex at all.

LFP is the most thermally stable lithium chemistry in commercial use. Every bay has cell-level BMS monitoring, thermal management, smoke and gas detection and an aerosol suppression system, and is laid out to Bangladesh fire-service separation requirements.

Free · no obligation

Stop losing batches to load-shedding.

We'll log your outages and load profile, size the battery to your critical lines and show the payback against your grid and diesel bills — free.

Request a Site AssessmentDownload Capability Profile

What you receive

  • 01Outage & critical-load analysis
  • 02Sized solar, battery and inverter design
  • 03Savings, diesel reduction and payback
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