Solar for a farm pump: compare the design before buying
Decision details
Fits if: Farm owners comparing solar for water pumping or other farm loads.
Main drawback: The cited material does not establish a pump-system size, project cost or return for a particular farm.
Compare: Pump nameplate, operating schedule, required flow and head, concurrent loads, storage, site connection and a complete written proposal.
In this guide
Land area alone cannot select a solar pump system. Record the pump nameplate, water duty, operating schedule, simultaneous loads, storage and site connection; then compare each written proposal’s design assumptions, equipment, scope and exclusions.
Start the purchase decision with the water task
Land area alone does not determine a pump system. Before choosing panels, a pump, inverter or storage, write down what the equipment must do: where water is needed, when the pump must run and which other loads must run at the same time. If the operating data is unknown, the next step is to establish the water duty and get a site review—not to select a package from an advertised capacity alone.
Use this worksheet to give each proposal the same starting information:
| Record before requesting a design | Copy or confirm |
|---|---|
| Pump | Exact make and model; a nameplate photo showing units, voltage and power. |
| Water duty | Required flow and pressure/head, delivery point, and daily or seasonal operating schedule. |
| Operating time | Hours and times the pump must run; say whether the task must continue in cloudy conditions or after sunset. |
| Other loads | List staff housing, lights, fence equipment or other loads separately, including what may run at once. |
| Site and connection | Location, electricity account and bill class if present, plus the connection available or proposed. |
| Water and storage | Describe any existing tank or water storage and which task must continue if energy supply changes. |
This is not a sizing formula. Ask the provider to state its assumptions and confirm that your actual pump model and water duty are used in the design. If the proposal is grid-connected, standalone or another arrangement, ask for the choice to be explained on a comparable basis.
Compare the proposal as a complete system
Do not compare one figure such as kWp, kVA or battery capacity in isolation. Ask each supplier to name the equipment and state what is included; copy the units exactly from the nameplate, proposal and datasheet. A forum post captured on 29 September 2026 asked about a planned farm solar system with a hybrid inverter, but it is a buyer question—not a recommended specification or proof that the configuration fits another farm (archived post).
| Comparison row | Get the supplier’s written answer |
|---|---|
| Pump and duty | Does the design use the pump model, flow/head and schedule you supplied? |
| Equipment | Model and quantity for panels, pump, inverter/controller and any proposed storage; preserve the stated units. |
| Operation and protection | How the system starts and is controlled, what protection is included, and which tasks the proposal does not cover. |
| Work and total | Site scope, wiring, installation, delivery, additional work, total price and exclusions. |
| After installation | Stated tests or commissioning, handover documents, warranty for each item and spare-parts contact. |
If proposals use different assumptions, ask both suppliers to explain the difference before choosing. Do not assume a water tank substitutes for electrical storage or the reverse; have the design provider confirm how your stated duty is covered.
Farm tariff: check the account class
The TNB record verified 30 September 2026, effective 1 July 2025, applies only to Peninsular Specific Agriculture Low Voltage General accounts: energy 27.03 sen/kWh, capacity 6.19 sen/kWh, network 11.19 sen/kWh and retail RM10/month. Check your bill class and current rates; these figures do not prove savings or pump performance. [source]
A bill-based indicative kWp uses an entered generation assumption, not measured site output. It does not establish flow, pump head or battery requirements. [source] Request a design based on actual water duty and connection.