Choosing the correct deep well pump is very important.
If the pump is too small → water will be weak.
If the pump is too big → you waste money and solar panels.

Follow these simple steps to choose the right Eiman deep well pump.

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Step 1 – Calculate Total Required Head (Very Important)

Head means:

How high the pump must lift the water.

It is NOT just the well depth.

You must add:

1. Water level depth (from ground to water surface)
2. Height from ground to tank or outlet
3. Pipe friction loss
4. Fittings loss (elbows, valves)
5. Safety margin (10–20%)

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Example:

Water level depth: 30 m
Tank height: 5 m
Pipe loss: 3 m
Fittings loss: 2 m

Total before margin:
30 + 5 + 3 + 2 = 40 m

Add 15% safety margin:

40 × 1.15 = 46 m total required head

👉 You must choose a pump that can deliver water at 46 meters head.

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Step 2 – Decide Required Flow (How Much Water Per Hour?)

Flow means:

How much water you want per hour.

Unit: m³/h (cubic meters per hour)

Typical reference:

Application	Recommended Flow
Household use	1–3 m³/h
Small vegetable farm	3–6 m³/h
Medium irrigation	6–10 m³/h
Livestock	2–5 m³/h

If you only fill a storage tank slowly, you can choose moderate flow.

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Step 3 – Understand the Rule: Higher Head = Lower Flow

Every pump has a performance curve.

Important principle:

When head increases, flow decreases.

Example:

Head	Flow
27 m	3 m³/h
19 m	6 m³/h
12 m	9 m³/h
6 m	12 m³/h

A pump cannot give maximum flow at maximum head.

So you must check:

👉 At your required head, how much flow can the pump still provide?

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Step 4 – Choose the Pump Model

Now compare:

Required head
Required flow

Choose a pump that can provide:

✔ Required flow
✔ At your calculated head
✔ With some safety margin

Do NOT choose based only on “maximum flow” written on the brochure.

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Step 5 – Match Solar Panels Correctly

For solar systems, pump performance depends on solar power.

If solar panels are insufficient:

• Pump may not start
• Water flow becomes weak
• Flow unstable in cloudy weather
• Pump may stop frequently

Make sure:

✔ Voltage matches pump requirement
✔ Total wattage is enough
✔ Panels are not shaded
✔ Use MPPT controller

Example solar configuration:

• 250W / 300W panels × recommended quantity
• 550W / 600W panels × recommended quantity

More head usually requires more solar power.

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Step 6 – Common Mistakes Farmers Make

❌ Only checking maximum flow
❌ Not calculating total head
❌ Using small diameter pipe
❌ Installing too few solar panels
❌ Buying cheapest model without checking performance curve

Result:

• Low water pressure
• Pump overload
• Short pump life

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Step 7 – Quick Summary

Before buying, always check:

✔ Water level depth
✔ Outlet height
✔ Total head
✔ Required flow
✔ Solar panel power

Correct selection ensures:

✅ Stable water supply
✅ Long pump life
✅ Lower maintenance cost
✅ Better irrigation performance

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Final Advice

If you are unsure, use the Eiman Selection Calculator:

Enter:

• Water depth
• Required flow

The system will automatically recommend the most suitable pump model.

For large farms or deep wells, always consult Eiman technical support for confirmation.