Where the money goes in a solar pumping system
We cannot put a price list on a page, because the array, the cabinet and the cable run all change with the site. What we can do is show the structure, which is stable, and the six decisions that move a budget more than anything a supplier does.
Shares below are ranges, not fixed figures, and they exclude the pump itself. No project prices appear on this page.
Updated
Budget inputs to send with your enquiry
Ask each bidder to price the same duty, delivery terms and scope. These inputs help obtain a comparable quotation; they are not a published price offer.
| Budget input | Specify or request |
|---|---|
| Water duty and site | Daily demand, total dynamic head, design month, location, water quality and source yield. |
| Equipment scope | Pump included or excluded; exact models, array, mounting, controller, protection, cables, pipework and tank. |
| Local work | Explicit inclusion or exclusion of drilling, foundations, installation, permits, testing and commissioning. |
| Delivery basis | Named Incoterm, named place or port, edition, packing, freight, insurance and unloading scope. Confirm taxes and clearance separately. |
| Commercial validity | Quotation date, currency, validity period, payment terms, lead time and treatment of later changes. |
| Support allowance | Spare parts, access or lifting equipment, planned maintenance and responsibility for site labour. |
The array is usually the biggest line
Not the pump. On 22 kW and up, modules are roughly a third to two fifths of the equipment cost.
The shares move with size
The drive cabinet is close to half the cost at 5.5 kW and about a quarter at 55 kW, because a cabinet is largely fixed per system.
Equipment is one layer of four
Freight, duty and the run to site sit on top of it, and none of them are in an FOB price.
Four layers to a landed cost
Most disagreements about price are actually disagreements about which layers are in the number being discussed.
| Layer | What it covers | Arranged by |
|---|---|---|
| Equipment, FOB China | Pump, drive cabinet, modules, mounting, DC cabling and protection, export packing, loading and export documents. | Us |
| Sea freight and marine insurance | Port to port, plus cover for the voyage. Varies with route, season and whether the load fills a container. | You or your forwarder |
| Duty and customs clearance | Rate depends on the tariff line and the destination. Conformity certification is usually arranged here too. | You or your customs agent |
| Inland transport to site | Port to farm. On a rural pumping site this is often longer and rougher than the buyer expects. | You |
Everything below this point is about the first layer only, the equipment. The other three depend on your route and your destination and we cannot usefully generalise them.
How the equipment cost splits
Shares of the equipment cost, excluding the pump itself. Read the columns downward rather than across: what matters is not any single number but how sharply the split moves as the system gets bigger.
| Pump | Array | PV modules | Drive cabinet | Mounting | DC cabling & protection |
|---|---|---|---|---|---|
| 5.5 kW (7.5 HP) | 7 kWp | 25 – 30% | 45 – 50% | 18 – 22% | 7 – 10% |
| 11 kW (15 HP) | 14 kWp | 30 – 35% | 35 – 40% | 20 – 25% | 8 – 11% |
| 22 kW (30 HP) | 29 kWp | 33 – 38% | 27 – 32% | 23 – 27% | 9 – 12% |
| 37 kW (50 HP) | 48 kWp | 35 – 40% | 23 – 28% | 24 – 28% | 10 – 13% |
| 55 kW (75 HP) | 72 kWp | 36 – 41% | 22 – 26% | 25 – 29% | 10 – 13% |
Ranges, not fixed figures. Derived from published module and mounting price bands and current drive cabinet pricing, with the array taken at 1.3 times pump power. Your own project will sit somewhere in or near these bands, not exactly on them.
The one thing worth taking from that table
The drive cabinet goes from around half the equipment cost at 5.5 kW to about a quarter at 55 kW. Modules move the other way, from roughly a quarter to nearly two fifths.
That is because a cabinet is close to a fixed cost per system while modules scale with kilowatts. It explains something buyers often read as bad pricing: a small solar pumping system genuinely costs more per watt, and no supplier can quote their way out of it.
What about the pump?
Left out of the table above on purpose, for two reasons. It is often not in scope, because plenty of buyers already have a working pump and need the solar side built around it. And where it is in scope, its share swings too widely to be useful as a band: a small submersible is a minor line, while a large borehole pump with 200 m of motor cable is not.
The useful point is the one buyers find surprising: the pump is rarely the expensive part. Most people arrive expecting it to be, and then find that the array that drives it costs more. If you already own a working pump, quoting the drive cabinet and array around it is almost always cheaper than replacing a pump that works.
Six decisions that move a budget
These move a total more than supplier choice does, and all six are yours to make. They are also all much cheaper to settle before an order than after.
Distance from the array to the cabinet, and from the cabinet to any grid or generator connection
DC and AC cable is priced per metre and sized for the run, not just the current. Halving a cable run is one of the few decisions that removes cost without removing capability.
Array clearance height above ground
Raising the array for bifacial gain, livestock or security means a taller, heavier structure and a deeper foundation. It is a real benefit with a real price, so decide it deliberately rather than by default.
Loose components or assembled and wired cabinet
A cabinet built, wired, programmed and factory tested before shipment costs more than an empty enclosure and a box of parts. It also removes the site work and the risk of it being wired wrong.
Array sizing ratio
An array at 1.0 times pump power only reaches full output around solar noon. Going to 1.3 or above buys back the morning and afternoon, and it is the single largest line on the bill, so it is also the largest lever.
Cabinet enclosure rating
IP54 suits an equipment room or a sheltered position. A cabinet standing fully exposed needs a higher rating, and that is a different cabinet rather than a different label on the same one.
Order size
On a small shipment, freight and documentation are spread over few units and can dominate the landed cost. The equipment saving is real; the freight share is what removes it.
Cable distance is the one people underestimate
Cable is priced per metre and sized for the run, not only for the current, so a long run costs twice: more metres and a larger cross-section. On a pumping site the array, the cabinet and any grid connection point are often placed by habit rather than by plan.
Moving a cabinet closer before anything is built is free. Doing it after the trench is dug is not. Walk the site with a tape before you agree a layout.
Making two quotations comparable
A cheaper total is usually a different scope. Six checks settle most of it.
| Ask for the bill of materials line by line | Manufacturer, model and part number on every line. Two lump sums are not comparable and cannot be inspected against. |
| Check the array ratio in each offer | One offer at 1.0 times pump power and another at 1.3 are not the same system. This is the largest single line, so it is where a cheap-looking quotation usually comes from. |
| Check whether the pump is in or out | Some offers include it, some assume you have one. It changes the total by a large margin and it is the easiest thing to miss. |
| Check the Incoterm | FOB China and CIF to your port are different numbers for the same goods. Neither includes duty, clearance or the run to site. |
| Check the cabinet: empty or built | An enclosure with parts in a box and a wired, tested cabinet are both honestly described as a cabinet. |
| Check what is excluded in words | Well work, pipework, civil foundations, installation and commissioning are normally out. An offer that does not say so has not thought about it. |
We quote line by line with manufacturer and model on every line, which is the only format that survives this comparison. If an offer you are holding does not itemise, ask for it before you compare anything.
Where cost can actually be taken out
| Keep the existing pump | If it works and the nameplate is readable, building the solar side around it avoids the largest avoidable purchase. |
| Shorten the cable runs | The only change on this list that removes cost without removing capability. |
| Go one pipe size up | Counter-intuitive, but less friction means less head, which means a smaller pump and a smaller array. Pipe is bought once. |
| Combine sites into one shipment | Freight and documentation spread over more units. On a programme this is usually the biggest single saving. |
| Be honest about the duty point | Sizing for a flow you do not need is paid for every day in array area. Work the number out rather than rounding up for comfort. |
| Decide the grid question early | Solar only, automatic transfer or standby are three different bills of materials. Choosing late means paying for the most expensive one. |
Get a bill of materials you can read
Send the duty point, or the nameplate of the pump you already have, and the site location. You get a selection, the pump curve with your point marked, and a priced bill of materials line by line.
Solar pumping cost FAQ
How much does a solar water pumping system cost?
It is quoted per project rather than from a price list, because the array, the cabinet and the cable run all change with the site. What is stable is the structure: on a complete system the PV array is normally the largest single line, the drive cabinet is next, then mounting, then DC cabling and protection. The share each takes moves a lot with system size.
What is the most expensive part of a solar pump system?
Not the pump, which surprises most buyers. On a system of 22 kW and above the PV array is usually the largest line at roughly a third to two fifths of the equipment cost. On a small system the drive cabinet dominates instead, because a cabinet is largely a fixed cost per system while modules scale with kilowatts.
Why do small solar pumping systems cost so much per watt?
Because the drive cabinet is close to a fixed cost per system. At 5.5 kW it can be around half the equipment cost; by 55 kW it is closer to a quarter. Freight and documentation behave the same way, spread over fewer units. Small systems are not badly priced, they are structurally different.
Does the quoted price include freight, duty and installation?
An FOB China price covers goods, export packing, loading and export documents at a Chinese port. Sea freight, marine insurance, duty, customs clearance and inland transport to site are four further layers arranged at your end. Installation and commissioning are separate again and done by your own contractor.
What makes a solar pumping budget go wrong?
Usually one of six decisions: how far the cable has to run, how high the array is raised, whether the cabinet arrives assembled or as parts, what array-to-pump ratio is used, what enclosure rating the cabinet needs, and how small the order is. All six are within the buyer’s control and all six are easier to settle before an order.
How do I compare two solar pump quotations fairly?
Ask both for a bill of materials line by line with part numbers, then check four things: the array-to-pump ratio, whether the pump is included, the Incoterm, and whether the cabinet is an empty enclosure or a wired and tested one. A cheaper total is usually a different scope rather than a better price.
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