Pumping to a tank: where small solar shines
A DC solar pump runs directly off its panel, no battery, and pumps whenever the sun is on it. For a stock tank that is exactly right: on a bright day it fills a tank or a raised cistern, a float valve stops the flow, and the tank carries the herd overnight. Cloudy days pump less, which is why the tank, not the pump, is the storage.
Sizing turns on lift and flow. A shallow pond or a spring box a few feet down needs a small surface pump on 100–200 W; a well with 100–200 feet of lift wants a submersible on 300–600 W or more. Kits from ranch and irrigation suppliers run very roughly a few hundred dollars for a pond pump to a few thousand for a deep-well setup, prices vary, and the panel should tilt steeply to shed snow and catch low winter sun.
Freeze protection for the pump side is straightforward: drain-back plumbing or a pitless setup so the line empties when the pump stops. Ranchers in Park County and the San Luis Valley have run these for years; the pump side rarely fails in winter. The tank is the problem.
De-icers: the honest arithmetic
A floating or submersible tank de-icer draws 250 W for a small trough up to 1,000–1,500 W for a big rubber or steel tank, and on a 10°F night it may run most of the night. Say 1,000 W for twelve hours: that is 12 kWh in one night. A 300 W panel in a Colorado January, on a good day, produces maybe 1 kWh. The gap is not close, and a battery big enough to bridge it costs more than the tank, the pump and the animals’ winter hay combined.
This is why solar de-icer kits mostly disappoint. They can keep a small drinking hole open in mild cold with a good insulated tank, and that is all. Anyone promising a panel that keeps a 300-gallon tank thawed through a Wyoming-border cold snap is selling you a battery you will have to replace every couple of winters.
Alternatives that actually keep water open
Insulated tanks and frost-free waterers do most of the work for free. A tank sunk into the ground or wrapped in insulation, with a small drinking opening and a lid, holds heat from the ground and the water itself; many make it through most Colorado winters with only occasional ice chipping. Energy-free waterers that draw on ground heat through a buried tube are common on Front Range and plains ranches.
Propane tank heaters are the standard where there is no power and a large herd needs open water; they burn a modest amount through a cold snap and need a bottle swapped now and then. A running-water setup — a continuous trickle from a spring or an overflow that keeps water moving — resists freezing well where the water source allows it.
Where there is any building with power within a reasonable trench, the best answer is a buried line to the tank and an ordinary AC de-icer on a thermostat. That is grid power, and the way to make it cheap is a solar array on the building it comes from.
The ranch-solar angle
A 1,500 W de-icer on a thermostat through a cold Colorado winter can add several hundred kilowatt-hours a month to a ranch meter, and two or three tanks multiply that. On a co-op rate that shows up. A grid-tied array on the barn or a ground mount beside it offsets the winter de-icer load with summer surplus through net metering, along with the shop, the well pump and the house.
Colorado co-ops and municipal utilities must net-meter residential systems to at least 10 kW and commercial to 25 kW under C.R.S. 40-9.5-118; larger operations fall under the utility’s own rules and our agricultural solar work. As of September 2026, business-scale solar still qualifies for the federal §48E credit if placed in service by the end of 2027, with 100% bonus depreciation; the residential 30% credit is gone. Confirm with your tax advisor which side your ranch is on.
What we can and can’t do
We don’t sell or install DC solar pumps, de-icers or off-grid pump stations, and we don’t install standalone panels with batteries at a remote tank. Ranch suppliers and well contractors do that work well and know the local water.
We install grid-tied solar on ranch houses, barns, shops and open ground, sized for the whole meter including the winter water load, and we can set a battery on the house for outages that would otherwise stop a well pump. If a remote tank has no power within trenching distance, a solar pump kit and an insulated tank remain the right combination, and we will say so.
What to do next
- 1Separate the two problems: getting water to the tank, and keeping it open. Solve them differently.
- 2For pumping, measure lift and daily gallons needed and price a DC pump kit sized for that from a ranch supplier.
- 3For freezing, start with an insulated or energy-free waterer; add propane or a trenched AC line only where that isn’t enough.
- 4If an AC de-icer runs off a building, pull that meter’s winter bills and see what the water load adds.
- 5Ask us about a barn-roof or ground-mount array sized for the whole ranch meter, water load included.
AI Colorado Solar installs grid-tied solar, batteries and EV chargers on homes and businesses across Colorado; we don’t sell or install the equipment described above. Prices mentioned are broad market ranges, not quotes.
FAQ
Questions we hear
Can a solar panel keep my stock tank from freezing?
Realistically, no — not a small one. A de-icer needs 250–1,500 W for hours on cold nights, and a small panel in January makes about a kilowatt-hour a day. Insulated tanks, energy-free waterers, propane heaters or a trenched AC line are what work.
Will a solar pump work in winter?
Usually, if it is a drain-back design so the line empties when the pump stops, and the panel is tilted steeply to shed snow and catch low sun. Output drops in December, so the tank needs to carry more days of water than it does in June.
How big a panel do I need to pump from a 150-foot well?
Typically a submersible DC pump on 300–600 W or more, depending on gallons per day. Deeper lift and more animals push it up. A ranch or well supplier will size it from the well log; we don’t sell these.
Does it make sense to run power to the tank instead?
If a building with power is within reasonable trenching distance, often yes. An AC de-icer on a thermostat is reliable, and a solar array on that building offsets the electricity. Beyond a few hundred feet the trench cost usually points back to insulated tanks and propane.
What does a de-icer cost to run on grid power?
A 1,500 W unit on a thermostat through a cold month can add several hundred kilowatt-hours; at typical Colorado co-op rates that is a noticeable bill line per tank. A grid-tied ranch array offsets it with summer production through net metering.
Do you install solar on barns and ranch buildings?
Yes — roof-mounted on barns and shops, or ground-mounted on open ground, all grid-tied and sized for the whole meter. Larger operations fall under our agricultural solar work with business tax treatment; confirm eligibility with your tax advisor.