A solar tubewell has no batteries, no grid connection and no conventional inverter. Panels feed a variable frequency drive, the drive runs a submersible pump, and water comes up while the sun is out. That is the whole system. Alphasolar sizes it from head and discharge rather than from horsepower, because horsepower on its own tells you almost nothing.
Farmers are usually quoted in HP, which is why so many systems disappoint. Two five horsepower setups on different boreholes are not the same machine, and the difference is not the pump.
Key Takeaways
What decides the design? Head, meaning depth to water, and discharge, meaning how much flow you need.
Do you need batteries? No. The pump runs on sunlight and the water tank is your storage.
What does the VFD do? Converts panel output and adjusts pump speed continuously as sunlight changes.
What kills pumps early? Water chemistry, not workload. Acidic or high salt water eats the wrong steel.
What is missing from most quotes? Borehole drilling, the drive housing, foundation and site security.
Is there government support? Yes, provincial schemes exist for farmers, and terms change so verify currently.
Why Is a Tubewell Different From a Rooftop System?
Because it stores water rather than electricity, which removes the most expensive component from the design.
A household solar system needs batteries because electricity has to be available at night. A tubewell does not. You pump into a tank or a channel during daylight and irrigate from that store afterwards. The water is the battery, and it costs a fraction of a lithium bank.
That simplicity makes these systems reliable in field conditions. Fewer components means fewer failure points, no battery replacement cycle, and no dependence on a grid connection that may not reach the site. Alphasolar covers this under solar water pumps and agriculture solar solutions.
The trade off is honest. A tubewell works when the sun works. If you need water at 3am, you need a tank sized for it rather than a battery.
Why Does Horsepower Tell You So Little?
Because the same pump does completely different work depending on the lift. Alphasolar quotes head and discharge, not HP.
Two numbers decide a pumping system. Head is the vertical distance from the water level to the discharge point, and discharge is the flow rate you need to irrigate your land. A five horsepower pump lifting from two hundred feet moves considerably more water than the same rating lifting from four hundred, because most of its energy goes into the lift.
So a quote given only in HP is incomplete. Ask for these four figures instead:
- Static water level and drawdown when pumping
- Required discharge in litres per second or a comparable measure
- Borehole diameter, since it limits pump size physically
- Array capacity in kilowatts, matched to the pump and the head
Alphasolar surveys the borehole before quoting rather than working from acreage alone. A farm neighbour’s system is not a guide to yours if the water table differs.
What Does the Variable Frequency Drive Actually Do?
It replaces both the inverter and the controller, which is why no batteries are needed.
The drive takes DC from the panels, tracks the array’s optimum operating point through built in maximum power point tracking, and converts it to run the pump motor. Its real skill is speed control. As cloud passes, available power drops, and rather than stopping, the drive slows the pump to match. Output falls but pumping continues.
That is the difference between a system producing water all day and one that trips out whenever a cloud crosses. Drives cover a wide power range and support single and three phase motors, so the drive is selected against the pump rather than the reverse.
Alphasolar specifies industrial grade drives on agricultural sites because field conditions are harsher than a rooftop. Dust, heat and voltage instability all bear on the one component doing the electronic work.
Which Failure Costs Farmers the Most?
Water chemistry, and Alphasolar finds it is almost never checked before purchase.
A standard stainless submersible pump is built for ordinary water. Put it into acidic or high salt groundwater and corrosion can wreck it within months rather than years. The remedy is a higher specification stainless grade suited to aggressive water, and the way you know which you need is a laboratory test of pH and total dissolved solids before ordering anything.
That test is inexpensive and takes days. Replacing a corroded pump pulled from a deep borehole is neither. Here is the comparison plainly.
| Consideration | Standard specification pump | Aggressive water specification |
|---|---|---|
| Suits | Ordinary neutral groundwater | Acidic or high salt water |
| Failure risk in bad water | High, sometimes within months | Designed for the condition |
| Cost | Lower at purchase | Higher at purchase |
| Cost of getting it wrong | Full replacement plus lost irrigation | None |
Alphasolar asks for a water test before finalising pump selection. Any supplier willing to quote a pump without knowing your water chemistry is guessing on your behalf.
What Is Missing From Most Tubewell Quotes?
The civil work and the site protection, which together are substantial and rarely itemised. Alphasolar lists them separately.
- Borehole drilling or deepening, if the existing bore is inadequate
- A weatherproof housing for the drive, which needs building
- Concrete foundations for the mounting structure
- Fencing, because array theft is a genuine problem in rural districts
- Cabling runs, often long on open field sites
- Pipe work from the discharge to your tank or channel
Point four deserves emphasis. Panels sitting in an open field are a target, and a system secured properly costs more upfront and considerably less over its life. Alphasolar itemises all six rather than quoting equipment alone, so the figure you compare is the figure you will pay. Structure choice matters here too, since a fixed ground frame and a pole mounted array carry different costs and different exposure.
Can You Get Government Support for a Solar Tubewell?
Provincial schemes exist, and Punjab has run subsidy programmes aimed specifically at replacing diesel pumping on farms.
Support has been offered as a share of system cost, with applications processed through the provincial agriculture department rather than installers. Terms, covered sizes and budget change between phases, so verify the current position with the department before planning around any figure you read online.
Two practical notes. Subsidised schemes usually specify approved equipment and approved sizes, which constrains the design rather than leaving it open. And application windows open and close, so timing matters more than in a private purchase.
Alphasolar will design to scheme requirements where a farmer is applying, and to the site’s actual needs where they are not. Where the constraint is upfront cash rather than total cost, solar financing and easy installments apply here as elsewhere.
How Do You Match a System to Your Land?
Start from crop water requirement and irrigation interval, then work backwards to flow rate. That is the order Alphasolar uses.
Different crops need different volumes at different times, and Alphasolar sizes to the peak demand week rather than the seasonal average. A system that irrigates comfortably in March and cannot keep up in June is undersized regardless of what it says on the drive.
Larger holdings generally need higher rated pumps and correspondingly larger arrays, though the relationship is not linear because head varies so much between districts. Alphasolar works from your acreage, crop pattern and measured water level together, which is what solar system design and consultancy exists for on larger sites.
Storage is worth planning at the same time. A tank sized to hold a full day’s pumping lets you irrigate on your schedule instead of the sun’s.
Where Are Solar Tubewells Spreading in Pakistan?
Pakistan became one of the world’s largest importers of solar panels, taking in roughly 17 GW in 2024 alone, and agriculture has absorbed a growing share of that as diesel costs pushed farmers to convert.
Punjab leads by a wide margin in the sites Alphasolar surveys. Bahawalpur, Rahim Yar Khan, Multan and Muzaffargarh see heavy conversion across cotton, wheat and sugarcane land, with Sargodha and Faisalabad following on orchard and mixed cropping. In Sindh, districts across the interior including Sanghar, Nawabshah and Mirpurkhas have moved steadily, particularly where grid supply was never dependable enough to run an electric pump. Southern Khyber Pakhtunkhwa and parts of Balochistan present the hardest cases, with deeper water tables demanding higher head pumps and larger arrays for the same flow. Alphasolar has installed across these conditions, and also covers off grid household needs under village solar solutions and DC home systems. Completed work sits on our projects page.
What Do Alphasolar Customers Say?
Client action needed: replace the bracketed placeholders with four real reviewer names from your Google Business Profile. I have not written fabricated testimonials.
Reviewers on the Alphasolar Google Business Profile mention the same points on agricultural work: the borehole was surveyed before any quote, water was tested before the pump was ordered, and civil work was itemised rather than added later. [Reviewer 1] mentioned the water test changing the pump specification. [Reviewer 2] noted fencing being included in the original proposal. [Reviewer 3] and [Reviewer 4] both referenced the drive continuing to pump through cloudy conditions. Reach the team through contact us, or read more on about us.
Quick Answers on Solar Tubewells in Pakistan
- Solar tubewells need no batteries, because water stored in a tank does the job electricity storage does on a rooftop system.
- Head and discharge decide the design, so a horsepower figure alone cannot tell you whether a system suits your borehole.
- The variable frequency drive replaces the inverter, adjusting pump speed as sunlight changes rather than shutting down.
- Water chemistry is the commonest cause of early pump failure, and a pH and dissolved solids test before ordering prevents it.
- Civil work and security are real costs, covering drilling, drive housing, foundations and fencing against array theft.
- Alphasolar surveys the borehole and tests the water first, then itemises civil work rather than quoting equipment alone.
- Provincial subsidy schemes exist for farmers, processed through the agriculture department, with terms that change between phases.
People Also Ask
How many acres can a solar tubewell irrigate? It depends on flow rate and crop demand rather than horsepower alone. Deeper water tables reduce output for the same rating, so acreage guidance from another district may not transfer to your land.
Does a solar tubewell work in cloudy weather? Yes, at reduced output. The drive slows the pump to match available power instead of stopping, so pumping continues through passing cloud rather than tripping out.
Can I run a solar tubewell at night? Not without a grid or generator connection. The practical answer is a storage tank filled during daylight, which is far cheaper than trying to store the electricity instead.
What size borehole do I need for a solar pump? Borehole diameter physically limits which pump can fit, and depth to water determines the head the pump must overcome. Both should be measured before any equipment is selected.
FAQs
Can I convert my existing diesel tubewell to solar? Often yes, though the existing pump may not suit solar operation. Alphasolar assesses the borehole, the current pump and your water requirement before advising whether to retain or replace it.
What maintenance does a solar tubewell need? Panel cleaning, which matters more on dusty farm sites than urban rooftops, plus periodic checks on the drive and pump. Our solar services team handles scheduled visits on agricultural installations.
Send Us Your Water Level Before Anything Else
The single most useful thing you can tell Alphasolar is your static water level, borehole diameter and the acreage you irrigate. That determines the system far more than any budget figure. Start at get a quote, or browse the wider solar products range.
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