Solar water pump guides

Size a solar water pump in five steps: daily gallons, design-month sun hours, flow, total dynamic head, then panel watts. Every number shown.

Total dynamic head is lift plus friction plus pressure. How to measure each part for a solar well pump, with worked examples and common mistakes.

Friction loss per 100 ft for polyethylene and Schedule 40 PVC at 0.5 to 20 gpm, computed with Hazen-Williams, and how to pick a pipe size.

Maximum head and maximum flow never happen together. How to read a DC solar pump's curve at your head and sunlight, and why the duty point matters.

Wiring panels to a DC water pump: matching array voltage to the pump's input range, series vs parallel, open-circuit voltage and cold weather.

How many panel watts a solar well pump needs for 250 to 2,000 gallons a day at 25 to 300 ft of head, computed from the same formula as our calculator.

Panels needed for a DC solar pump or an existing AC well pump on a battery: the energy method, a lookup table by running watts and hours, and worked examples.

How far a 12V, 24V or 48V solar pump can be from its panels on each wire gauge, computed from NEC Chapter 9 Table 8 resistance at a 3% voltage drop.

How to read a driller's log, measure static and pumping water levels, run a simple drawdown and recovery test, and match a solar pump to what a well can give.

How to set panel tilt for a solar water pump by season, when a tracker earns its cost on a direct-drive pump, and how to check your site in PVWatts.

When a solar water pump has to go down the well and when it can sit on the bank: suction lift limits, pump types, flow, maintenance and cost compared.

How deep a solar well pump can lift, why flow falls with depth, what a big lift needs, and the safety rope, check valve and well-yield issues.

Should a solar water pump run straight off the panels into a tank, or from a battery? Cost, reliability, winter and when each makes sense.

What a solar pump controller does, how MPPT helps a DC pump start in low light, and how to wire float switches and dry-run protection.

How many days of water to store behind a solar pump, where to put the tank, raised-tank pressure and overflow, with the arithmetic for livestock and homesteads.

DC brushless solar pumps, AC pumps on a solar pump inverter, and AC pumps on batteries compared: power range, voltage, efficiency, cost, and when each fits.

The three pumping mechanisms in solar water pumps compared: behaviour at high head and in low sun, what wears out, and which fits deep wells, ponds and tanks.

Keeping a 120V or 240V AC well pump on solar: inverter surge and split phase, battery size, panel watts, soft starters, and when replacing the pump is cheaper.

Choosing a solar pump's voltage: current and wire size, panel strings, battery systems, and which voltage suits short runs, deep wells and long cable runs.

What to check before buying a solar well pump kit: the curve at your head, voltage window, box contents, cable length, dry-run protection, parts and origin.

Sizing a solar stock-watering system: daily water by animal from NDSU, tank and trough layout, winter use, pasture wells and moving water away from streams.

How to run drip irrigation from a solar water pump: gallons per square foot, emitter pressure, pumping to a raised tank for gravity drip, and zone sizing.

Solar fountains vs diffused aeration for ponds, why oxygen is lowest at dawn, when a battery is needed, and the thin-ice hazard of winter aeration.

Supplying a cabin or homestead from a solar well pump: gravity tank vs pressure tank, booster pumps, daily household use and keeping the system simple.

Daily gallons, flow, storage and panel watts for 10, 25, 50, 100, 150 and 200 head of beef cattle on a solar pump, at 100 ft and 200 ft of head.

Gallons a day, flow and panel watts to irrigate 1/4, 1/2, 1, 2 and 5 acres from a solar pump at 1 to 1.5 inches a week, and where small DC pumps run out.

Pumping surface water with solar: suction limits, screened and floating intakes, spring boxes, flood-proof mounting, water rights and ram pumps.

Giving an off-grid house tap pressure from a solar-filled cistern: booster pump size, pressure switch and tank pre-charge, energy use, and filtering.

Small solar fountain and birdbath pumps explained: lift height vs spray height, why they stop in shade, battery models, placement, cleaning and winter storage.

Solar water pump component prices read from merchant stores in October 2026: panels per watt, controllers, LiFePO4 batteries, kits, and the rest.

When a DIY solar water pump kit makes sense and when to pay an installer: well depth, licensing, warranties, grant paperwork and the parts kits leave out.

REAP changed on 16 October 2026: grants now follow construction, cap at 25% and bar foreign-adversary parts. How REAP and EQIP apply to solar pumps.

The NRCS practice codes behind an EQIP-funded solar stock-water system (533, 614, 516, 642, 574, 382, 528), the 533 rules for PV, and how to apply.

Do you need a permit to drill a stock or domestic well or pump from a spring? Riparian vs prior appropriation, and well rules in eight western states.

Why remote solar pumps are lightning-prone, how array frames and controllers are grounded under NEC Article 690, surge protection, and wellhead details.

A season-by-season maintenance checklist for solar water pumps: panel cleaning, intake screens, diaphragm and brush wear, wiring, float switches and the tank.

Keeping a solar water pump working through freezing weather, or shutting it down safely: drain-back, burial depth, tanks and battery temperature.

Why a solar water pump will not start, pumps nothing, cycles, or delivers less than it used to: a diagnostic table of causes and fixes.