The dry season is the solar season
Drought pressure and peak sunshine arrive together — the 'sun synchronous' match at the heart of solar pumping. A system sized for your driest month, pumping into several days of storage, turns the hardest season into the most productive one.
Get Low-Yield Source Sizing & Quote
Slow, continuous surface pumping maximizes yield from delicate springs and low-flow sources without depleting them.
3-7days of water storage recommended — your buffer through heat waves and cloudy spells
- Made in the USA since 1983 — the world's first solar pump manufacturer
- 15-20 year life expectancy with regular maintenance and user-replaceable wear parts
- Free system design: our engineers confirm every sizing before you buy
Why Growers & Ranchers Choose Dankoff Solar
Manufactured in the USA since 1983 — built for remote off-grid independence.
Zero Fuel & Power Bills
Operates 100% on direct sunshine with no batteries required for standard stock and irrigation setups.
Water When Needed Most
Sun-synchronous delivery ensures peak water volume during the hottest, driest months of the year.
Field Serviceable in Minutes
Solid cast iron and brass bodies with user-replaceable wear parts. No disposable plastic throwaways.
Certified Factory Sizing
Our engineers calculate pipe friction, total dynamic head, and exact PV array size free of charge.
Calculate Your System Requirements in 10 Seconds
Select your state and estimated daily gallons to see local peak sun hours and recommended pump model.
Size it in ten seconds
Build the buffer before you need it
Storage is the cheapest insurance in water planning: pump all day from slow-producing sources, and store for the week in secure storage tanks.
SlowPump Surface Pump
Draws as little as 0.5 to 3 GPM continuously without overdrawing fragile wells or seasonal seeps.
SunCentric Pump
Moves massive volume on high-sun days to fill storage ponds and multi-thousand gallon tanks.
Find Your Pump
Size your dry-month demand and storage buffer with our factory engineering calculator.
Slow solar harvesting vs. high-power rapid pumping
| Evaluation Factor | Dankoff Slow Solar Harvest | High-HP Intermittent Pumping |
|---|---|---|
| Aquifer preservation | Pumps 1-3 GPM continuously; preserves low-flow well recovery | Over-pumps well; draws air and destroys pump impeller |
| Storage economics | Turns low-cost gravity tanks into a 7-day reserve | Requires massive generator or high electric peak demand |
| Dry season performance | Produces maximum volume when sunshine is highest | Struggles with grid brownouts and high fuel prices |
| Equipment lifespan | 15-20 years with regular maintenance | Frequent dry-run motor burnout |
Hydrogeology principles from Dankoff's 'Solar Water Pumping Basics and Terminology'.
“Our low-yield spring would run dry in 20 minutes with a standard pump. The SlowPump draws all day at 1.5 GPM and keeps our 5,000-gallon tank topped off all summer.”
— Homesteader, New Mexico High Desert
Common Questions & Technical Answers
Direct engineering answers to the sizing, installation, and field reliability questions we receive daily from ranchers and solar installers.
Have an unlisted question or complex site?
Our engineers in Elk City, OK calculate total dynamic head and friction loss for your exact setup.
+1 505-471-346901Why is slow continuous solar pumping better for low-yield wells?
High-horsepower pumps pull water faster than a weak aquifer can recharge, causing drawdown and cavitation. Dankoff positive-displacement pumps draw slowly (0.5–3 GPM) all day long, harvesting thousands of gallons without stressing the well.
02How many days of storage should I plan for?
Dankoff recommends sizing storage tanks for 3 to 7 days of peak summer water demand. Storing water is substantially more economical and reliable than storing electricity in battery banks.