Rooftop Solar for Landlords in Bangladesh: A Practical Look

Electricity bills in rented buildings keep rising, load-shedding returns every hot season, and the roof of most Bangladeshi buildings sits mostly unused apart from water tanks, clotheslines and the occasional garden. It is no surprise that more landlords are asking about rooftop solar in Bangladesh. Can solar panels cut the building's common-area bill? Can they keep the pump and stair lights running during power cuts? Is net metering worth the paperwork? And how do you share the benefit fairly with tenants?

This article takes a practical, balanced look at rooftop solar for landlords. It explains the main system types, what solar can and cannot power, how net metering works in general terms, how to estimate costs and savings, structural and safety checks, and how to handle the tenant side. It is general educational information, not investment or engineering advice. Every building is different, so always get assessments and quotations from qualified, reputable solar installers and check current rules with the relevant authorities.

Why Landlords Are Looking at Rooftop Solar

For a landlord, the attraction of solar usually comes from three directions:

• Lower common-area bills: in most rented buildings, the landlord or the building's service charge fund pays for the water pump, lift, stair and parking lights, security lights and CCTV. These run every day and add up to a significant monthly bill.
• Backup during load-shedding: a solar system with batteries can keep essential common loads running during daytime cuts, and sometimes into the evening.
• A more attractive building: tenants appreciate reliable lights, water and lower service charges. A well-run solar system can be a small but real selling point.

There are also broader reasons. Bangladesh has policies encouraging renewable energy, and many owners like the idea of reducing reliance on fossil-fuel generation. But the decision should rest on the numbers and practicality for your building, not only on the idea.

The Three Main Types of Rooftop Solar Systems

Grid-tied systems are usually the cheapest per kilowatt because they avoid batteries, which are expensive and need replacement over time. Hybrid systems cost more but address load-shedding. Off-grid systems are simple for small, specific loads.

What Solar Can and Cannot Power in a Rented Building

A common disappointment comes from expecting too much. Rooftop area in a typical Dhaka building is limited, and a large part may be taken by water tanks, stair rooms, lift machine rooms and shaded areas. That limits how many panels you can install.

Realistic loads for rooftop solar

• Stair, corridor, parking and gate lighting.
• CCTV, intercom and the guard room.
• The water pump during daytime, if the system is sized for it.
• Part of the lift load during the day in some buildings, though lifts are heavy loads and need careful design.

Usually unrealistic

• Powering all flats in a multi-storey building. The roof area simply cannot produce that much energy.
• Running air conditioners across the building from solar alone.
• Full night-time backup without a very large (and expensive) battery bank.

For most landlords, the sensible target is: make the building's common services as self-sufficient as practical, and reduce the common-area bill. For more on backup planning, see our guide on load-shedding, generators and IPS for tenants.

Net Metering in Bangladesh: The General Idea

Net metering allows a building with a grid-tied solar system to export surplus electricity to the grid and have it credited against electricity drawn from the grid. Bangladesh has introduced net metering guidelines, and distribution utilities such as DESCO, DPDC, BREB (Palli Bidyut) and others handle applications within their areas.

In general terms, the process involves applying to your distribution company, having a suitable bidirectional meter installed, meeting technical and safety standards, and inspection before connection. The details, including eligibility, size limits, how credits are settled and the application steps, are set by the current guidelines and the utility's procedures, and they may change. Check with your distribution company and the Sustainable and Renewable Energy Development Authority (SREDA) before planning around net metering.

Important: Net metering is tied to a specific electricity connection and meter. In a rented building with separate meters for each flat, the solar system will normally be connected to the common/owner meter. It does not automatically reduce tenants' individual bills.

Estimating Costs and Savings

Solar economics depend on system size, equipment quality, installation cost, local sunshine, how much of the energy you use yourself, your electricity tariff and, for batteries, replacement costs. Prices change, so always get multiple current quotations. The example below only shows how to think through the numbers.

Worked example: a simple payback estimate

For example (illustrative): a landlord in Dhaka installs a 5 kW grid-tied system on the roof to supply common loads. Assume the following placeholder figures (not actual market prices):

Monthly saving = 600 kWh × Tk 10 = Tk 6,000. Annual saving = Tk 6,000 × 12 = Tk 72,000. Net annual saving after maintenance = Tk 72,000 − Tk 6,000 = Tk 66,000. Simple payback = Tk 350,000 ÷ Tk 66,000 ≈ 5.3 years.

Now the realistic adjustments. Dhaka's air pollution and dust reduce output if panels are not cleaned. Monsoon months produce much less. Shading from neighbouring buildings can cut output sharply. If you add batteries for backup, the upfront cost rises significantly and batteries need replacement over the system's lifetime. If tariffs rise, savings increase. The point of the example is the method: estimate generation, multiply by the value of each unit, subtract maintenance, and compare with cost. This is not investment advice; get a site-specific assessment.

Structural and Roof Checks Before Installation

Panels, mounting structures and batteries add weight, and the roof must handle wind loads during storms and cyclones. Before installation:

• Structural assessment: have a structural engineer confirm the roof can take the load, especially in older buildings or where extra floors were added.
• Waterproofing: mounting should not damage the roof waterproofing. Fix leaks before installing, not after.
• Wind resistance: mounting must be properly anchored or ballasted for strong winds. Coastal and Chattogram-area buildings need particular care.
• Shading analysis: check shade from water tanks, stair rooms, neighbouring buildings and trees throughout the year.
• Access and maintenance: leave walkways for cleaning and inspection; do not block rooftop exits or water tank access.
• Approvals: check whether any permission or notification is required for rooftop structures in your area, and discuss with the installer.

Electrical Safety and Equipment Quality

• Use reputable installers who follow recognised standards and provide warranties on panels, inverters and workmanship.
• Insist on proper earthing, lightning protection, DC isolators and correctly rated cables.
• Batteries must be placed in a ventilated, dry, safe location, away from stairways used for escape.
• Keep the inverter and batteries away from water tanks and damp areas.
• Label the system clearly so electricians and fire responders know it exists.

Poor-quality components and installation are the most common reason solar systems disappoint. Cheaper is not always cheaper over ten years. For wider safety duties, see our guide on building safety compliance.

Sharing the Benefit With Tenants

How tenants benefit depends on how the building's costs are structured:

If common-area electricity is part of the service charge

Solar reduces the common electricity bill, so the service charge can be reduced, or held steady while other costs rise. Be transparent: show tenants the before-and-after common bill so they understand the benefit. Some landlords recover part of the installation cost through the service charge over an agreed period. If you do this, explain it in writing and do not charge tenants more than the actual saving.

If the landlord pays common electricity directly

The saving goes to the landlord, which improves the building's net income. The tenant benefit is indirect: more reliable common lights and water during daytime cuts.

If tenants want solar for their own flat

A tenant who wants to install a small solar setup on a balcony or share of the roof must get the landlord's written permission, use a qualified installer, and agree what happens at the end of the tenancy. Rooftop space is shared, so allocate it fairly.

For more on how service charges are structured, see what service charge in apartments means.

Solar Decisions by Building Type

Family-owned house with a few rented flats

This is often the simplest case. The owner lives in the building or nearby, controls the roof and pays the common bill. A modest hybrid system for stair lights, the pump and the owner's own flat can be a practical start. Decisions are quick because there is only one owner.

Apartment building with multiple flat owners

When flats are owned by different people and the roof is common property, installing solar needs the agreement of the owners' association or the owners as a group, usually recorded in meeting minutes. Agree in writing who pays for the system, who owns it, how savings are applied to the service charge, and who is responsible for maintenance. Without this, a good idea can turn into a long dispute.

Market, shopping complex or commercial building

Commercial buildings often have large daytime loads such as corridor lighting, escalators, lifts and ventilation, which match solar's daytime output well. Roof areas can also be larger. At the same time, electrical and fire safety requirements are stricter, and the system should be designed by experienced engineers. Tenants in commercial buildings are also more likely to ask detailed questions about how service charges change, so keep clear records.

Buildings with limited or shaded roofs

If tall neighbouring buildings shade your roof for much of the day, or the roof is largely occupied by tanks and machine rooms, solar output may be too low to justify the cost. In that case, energy efficiency measures such as LED lighting, motion sensors in stairwells and an efficient pump may deliver better value first.

Maintenance: Keeping the System Productive

Keep a simple log of monthly generation. A sudden drop usually means dirty panels, shading, or a fault that needs attention.

Common Mistakes Landlords Make With Solar

• Buying on price alone and ending up with poor panels or an unreliable inverter.
• Skipping the structural check, especially on older roofs.
• Expecting grid-tied systems to work during power cuts without batteries.
• Oversizing the battery bank beyond budget, or undersizing it so backup lasts only minutes.
• Never cleaning the panels in dusty Dhaka air.
• Not telling tenants how solar affects service charges, leading to suspicion.
• Blocking roof access or escape routes with panels and batteries.
• Assuming net metering rules without checking current guidelines with the utility.

A Step-by-Step Plan for Landlords

1. Collect 12 months of common-area electricity bills to understand your usage.
2. List the loads you want solar to supply, and whether you need backup.
3. Get a structural and shading assessment of the roof.
4. Request quotations from at least three reputable installers, comparing equipment brands, warranties and after-sales service.
5. Check net metering and any other requirements with your distribution company.
6. Decide how the cost and benefit will be reflected in rent or service charges, and inform tenants in writing.
7. Install, commission and keep all documents, warranties and test reports.
8. Monitor generation monthly and maintain the system on schedule.

Final Thoughts

Rooftop solar is not a magic solution for every rented building, but for many landlords it can meaningfully reduce common-area bills and keep essential services running during daytime cuts. Start with realistic goals, a proper roof assessment and quality equipment, check net metering rules with your utility, and be transparent with tenants about costs and benefits.

Once a system is installed, tracking whether it pays off is simply a matter of good records. Bariwala ERP (বাড়িওয়ালা ERP) lets you record the installation and maintenance as building expenses, compare monthly utility costs over time in its income and expense reports, and adjust service charges on tenant invoices when the savings arrive.