Solar Water Pumping for Pastures

Solar pumps can bring water to pastures that have no power line. They work well when they are sized, installed and maintained with care.

Key points

Solar pumps use panels, a controller, a pump and storage to supply remote water.
Storage lets cattle drink on cloudy days and at night.
Have a dealer, NRCS or extension agent size the system for your site.
Protect equipment from cattle, weather and theft.
Plan for maintenance, backup water and safe electrical work.

How solar pumping works

A solar water system uses panels to power a pump, often through a controller. The pump moves water from a well, pond or other source to a storage tank, and gravity feeds tanks for cattle. Because the sun supplies power during the day, many systems store water instead of batteries.

This setup suits remote pastures where running power would be costly. It runs best on sunny days, so storage matters on cloudy ones.

Because solar output changes through the day and the seasons, water delivery changes too. Ranchers often find that a modest, steady flow into a good-sized tank serves cattle better than a short burst.

Main components

A typical system includes solar panels, a mounting structure, a controller, a pump, wiring, a storage tank and a trough or tank with a float. Some systems add batteries, though many ranchers avoid them for simplicity.

Choose components designed to work together and follow the manufacturer's instructions. Ask dealers about pump type, lift, flow and how the system handles changes in sun and water level.

Ask the dealer how the system protects the pump if the well runs low or the tank is full. Good controls and float switches prevent damage. Check that panel mounts can handle wind, snow and the occasional rubbing animal. A mount that tips in a storm can wreck the panels and the pump along with it.

Panels and a sturdy mount
Controller matched to the pump
Pump suited to your source and depth
Storage tank for cloudy days
Trough with a protected float

Sizing concepts

Sizing depends on how much water your herd needs, how deep or far you must pump, and how much sun your area gets. Exact figures depend on your site, so ask a qualified dealer, NRCS or extension agent to size a system for your herd and source.

Remember to plan for hot weather and growth in herd size. A system that barely meets demand today may fall short next year.

Do not forget winter. Shorter days and lower sun angles can reduce output, and freezing can damage pipes and pumps, so ask your dealer how the system handles cold.

Storage and backup

Storage lets cattle drink on cloudy days and at night. Ask your dealer or NRCS how much storage fits your herd and conditions. Think about a backup plan, such as a second source, hauled water or a generator, in case the system fails.

Check storage tanks and floats often. A stuck float can drain a tank or flood a lot.

A second tank or a connection to another source gives you a margin during repairs and during a hot spell.

Maintenance and protection

Inspect panels, wiring, connections and the pump on a regular schedule. Clean panels as needed and keep brush and shade away. Protect equipment from cattle with fencing and sturdy mounts.

Theft and vandalism can be a problem in remote areas, so think about security and insurance. Ask your insurance agent what is covered.

Fence panels and the trough away from the pump so cattle cannot rub on equipment or foul the wellhead.

Safety and cost

Solar systems involve electricity and sometimes work in wells or on ladders. Follow manufacturer, OSHA and NIOSH guidance and have a qualified person handle wiring. Never work on a live system.

Costs and cost-share vary, and program terms change. Talk with NRCS, USDA FSA or your lender about help with installation. This is not financial advice.

Keep manuals, warranty papers and wiring diagrams in a single folder, and photograph the setup after installation so a repair person can see how it was built.

Common mistakes

Common mistakes include undersizing the system, skipping storage, using mismatched parts, leaving equipment unprotected and not planning for maintenance. Another is picking a dealer with no local support.

Ask for references and visit working systems. Ask the dealer what happens when something breaks and how quickly they respond.

Write down the panel angle, tank size, pump model and installation date in one place. When you call a dealer or a repair person later, that information saves time and avoids guesswork about what was installed.

When to get help: Ask NRCS, your extension office or a qualified dealer to size and design the system, and a licensed electrician for wiring and safety questions.

Sources and further reading

Organization homepages are linked so you can search them for current guidance on this topic.

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