Guides · Faisalabad, Lahore, Punjab
Solar for Cold Rooms in Fruit and Vegetable Markets
Short answer
Solar for fruit and vegetable cold rooms works when the design accepts one awkward fact: a mandi's busiest hours, unloading trucks, auctions and door openings, often fall at night and before dawn, when panels produce nothing. Solar is very good at holding rooms cold through the hot afternoon, when compressors work hardest. The night and early-morning load is carried by the grid, a battery, or well-insulated rooms that have been pulled down to temperature during the day.
This guide is for traders, commission agents and owners of walk-in cold rooms and ripening chambers in and around Punjab's fruit and vegetable markets. Large standalone cold storage warehouses and ice factories are covered in our solar for cold storage and ice factories guide.
How a mandi cold room is different
A cold storage warehouse holds potatoes or produce for months. A mandi cold room usually does something else:
- Short holding. Produce sits for days, not months, between arrival and sale.
- Frequent door openings. Stock moves in and out every day, often at night.
- Mixed produce. One trader may hold several fruits and vegetables at once.
- Small rooms, many owners. A market may have dozens of walk-in rooms, each with its own condensing unit and often its own meter.
- Crowded sites. Roofs are small, shared, shaded by neighbours and sometimes covered with tanks and signboards.
Each of these changes the solar design.
Cold rooms in markets
Day
Compressors on solar
Night
Battery or grid
What the load looks like
A walk-in cold room's load comes mainly from its condensing unit, plus evaporator fans, lights, door heaters on freezer rooms and defrost.
| Room type | Load pattern | What it means for solar |
|---|---|---|
| Chiller room (fruit, vegetables) | Compressor cycles all day; peaks on hot afternoons and after loading | Afternoon load matches solar well |
| Freezer room | Higher, steadier load; defrost cycles | Needs more energy around the clock |
| Banana or mango ripening room | Controlled ripening cycles over several days; temperature held closely | Steady load; cycle timing can sometimes be planned |
| Small reach-in or display chillers | Low, steady | Easy to carry on a small hybrid system |
The night peak is the problem. When a truck is unloaded at 2 AM, warm produce goes into the room and the door is open for a long time. The compressor then runs hard for hours. No panel helps with that.
A few days of load logging on your room's supply show exactly when the compressor runs. Our energy audit before solar guide explains what to measure.
Mixed produce and temperature
Different produce needs different conditions. Agricultural guidance on mixed storage groups produce roughly into cold-tolerant items kept near freezing, moderately cold-sensitive items kept a little warmer, and tropical items such as bananas and mangoes kept warmer still to avoid chilling injury. Some fruits also give off ethylene, which can spoil sensitive vegetables stored beside them.
This is not a solar question, but it affects the electrical design. A trader who splits one large room into two rooms at different temperatures changes the number of compressors, their running hours and the load profile. Settle the room plan with your refrigeration contractor before sizing solar.
Three design approaches
1. Daytime solar, grid at night
The simplest option. An on-grid or hybrid inverter supplies the compressor in daylight, and the grid takes over at night. It needs no battery and suits sites where the grid is fairly reliable at night. Under net billing, most of the solar output is used on site because afternoon cooling load is high.
2. Pull down by day, coast by night
Run the room a little colder in the late afternoon, while solar is still producing, so it can coast for longer after sunset with fewer compressor starts. This works only with good insulation, tight doors and produce that tolerates the setting. Your refrigeration contractor must agree the temperatures; the produce comes first.
3. Hybrid with battery
A battery carries the room through evening hours or load-shedding. Battery power must cover the compressor's starting surge as well as its running load. A compressor started directly on line can draw several times its running current for a moment, so the battery and inverter must be sized for that, or the unit fitted with a soft starter or inverter-driven compressor. Our guide to inverter vs non-inverter ACs explains why inverter-driven compressors are kinder to solar systems.
A battery is costly, so it needs a measured job: protecting stock through outages, or covering a predictable evening load. Our guide Battery storage (BESS): when does it pay? shows how to test it. For commercial batteries and hybrid inverters we work with Huawei, Sungrow and Luminey. Our hybrid vs on-grid vs off-grid guide compares the system types.
Practical issues in a market
Roof space and permissions
Mandi roofs are often small and shared. Panels may need a raised structure to clear tanks and signboards, or a canopy over a loading bay. See solar carports and canopies. Before any work, confirm who owns the roof and what the landlord or market committee allows.
Shared buildings and separate meters
Where several traders share one building, each usually has a separate meter. Solar can supply only the meter it is connected to. Sharing one plant across several meters is not straightforward. Our guide to solar for buildings with multiple meters explains the options, and commercial solar for shops and plazas covers shared commercial buildings.
Dust, heat and theft
Markets are dusty, and panels near loading areas collect grime fast. See how often to clean solar panels. Afternoon heat also cuts panel output a little, which matters because that is when your compressor works hardest; see solar panels in Punjab summer heat. Busy, open sites need anti-theft fixings: our solar panel theft guide lists the measures.
Keep the condenser and inverter apart
Condensing units throw out hot air. Do not mount the inverter or battery in that air stream. Give each its own shaded, ventilated spot.
Net billing
New solar connections come under NEPRA's net billing rules, notified on 9 February 2026. Imported units are billed at your normal tariff, and exported units are credited at a much lower rate. System size cannot exceed your sanctioned load. See our net metering and net billing guide. For a cold room, which uses most of its afternoon solar on site, this is a good fit.
How to estimate the benefit
We do not publish savings figures. Here is a simple method with round illustrative numbers only.
For example, if a chiller room uses about 60 units a day in summer, and logging shows about 25 of those fall between 9 AM and 4 PM, a plant sized to cover most of those 25 units would use nearly all its output on site. If pulling the room down in the late afternoon moves another 5 units of compressor running into solar hours, more of the load is covered at the full tariff. Multiply by your own tariff, and repeat for winter, when both the load and solar output fall.
Cold room solar price
| Scope | What drives the cost | Price |
|---|---|---|
| On-grid or hybrid solar for one cold room (per kW) | Panels, inverter, raised structure | WhatsApp for today's rate |
| Battery for night or outage cover (optional) | Usable kWh, power rating for compressor start | WhatsApp for today's rate |
| Raised structure or loading-bay canopy | Height, span, fixing method | WhatsApp for today's rate |
How Solar Works Pakistan can help
Solar Works Pakistan is a Faisalabad-headquartered solar EPC, engineering and trading company founded in 2021, with a branch in Lahore. We have served 300+ customers, including 50+ industrial clients, and we build systems from about 6 kW.
- In-house load analysis, AutoCAD design and custom structures for tight sites, with a 3-year structure warranty.
- Hybrid and battery systems sized for compressor starts.
- Installation and commissioning by our own teams.
- Manufacturer warranty per product, and a 48-hour target to send service personnel after a complaint is registered.
Get today's price or a free site survey
Send us your electricity bills, the size and number of your cold rooms, the condensing unit ratings and your loading hours. Our engineers will tell you plainly how much of the load solar can carry.
- WhatsApp or call: 0336 666 4321
- Email: info@solarworks.pk
- Head office: Main Boulevard, Sargodha Rd, Block F FDA City, Faisalabad
- Lahore branch: 2nd Floor, Jeff Heights, Gulberg, Lahore
- Hours: 9:00 AM to 6:00 PM, daily
We serve all of Punjab, and site surveys are normally free. You can also contact us online.
Frequently asked questions
Can a cold room run on solar power?
Yes, in daylight, and that is when a cold room works hardest. Night and early-morning loads, when most mandi loading happens, need the grid, a battery or good insulation that lets the room coast.
How many solar panels does a walk-in cold room need?
It depends on the condensing unit, the room size, door openings and how much of the load falls in daylight. A few days of logging gives a reliable answer; a rule of thumb does not.
Can one solar plant supply several traders' cold rooms?
Not simply. Each meter is a separate connection, and solar can only supply the meter it is wired to. Sharing needs a specific legal and technical arrangement.
Do I need a battery for my cold room?
Only if it has a clear job, such as protecting stock during load-shedding. The battery must also handle the compressor's starting surge, not just its running load.
Is solar suitable for a banana ripening room?
Yes. Ripening rooms run steady, controlled cycles, so solar can carry a good share of the daytime load. Temperature control must never be compromised to suit the solar system.
What if my roof belongs to the market or a landlord?
Get written permission first. A raised structure or canopy over a loading bay may be an option where the roof is too small or shared.
Sources
- Department of Primary Industries and Regional Development, Western Australia, "Mixed storage of fruits and vegetables"
- Net billing facts are carried over from our net metering and net billing guide, which lists its own sources, including the NEPRA (Prosumer) Regulations, 2026, SRO 251(I)/2026: https://ke.com.pk/wp-content/uploads/2026/04/8.-NEPRA-Prosumer-Regulations-SRO-251I2026-09-02-26.pdf