ट्याङ्की भर्न कति समय र पैसा? Time and cost for one tank fill

पानी पम्पले ट्याङ्की भर्न कति समय र बिजुली लिन्छ? How long and how much electricity will your pump use?

ट्याङ्कीको लिटर, मापन गरेको flow र पम्पले तानेको kW राख्नुहोस्। एकपटक भर्दा लाग्ने समय, युनिट र खर्च देखिन्छ। Head र efficiency ले power को छुट्टै जाँच दिन्छ। Enter tank litres, measured flow, and the pump's electrical input kW. See time, energy, and cost per fill, with a separate head-and-efficiency power check.

तपाईंको ट्याङ्की र पम्पYour tank and pump

भर्नुपर्ने पानीWater to fill

पूरै ट्याङ्की होइन भने खाली भागको लिटर राख्नुहोस्।If the tank is partly full, enter only the empty litres.

वास्तविक flowMeasured flow rate

L/min

बाल्टी वा flow meter बाट चलिरहेको बेलाको flow नाप्नुहोस्।Measure operating flow with a bucket test or flow meter.

कुल dynamic headTotal dynamic head

ठाडो उचाइसँगै pipe friction, bend, valve र चाहिने pressure जोडिन्छ।Include vertical lift, pipe friction, bends, valves, and required outlet pressure.

समग्र efficiencyOverall wire-to-water efficiency

Pump र motor दुवैको संयुक्त अनुमान। Curve वा test भए त्यही राख्नुहोस्।Combined pump and motor estimate. Use a curve or test value when available.

Motor को electrical inputMotor electrical input

चलिरहेको बेलाको meter reading वा input power राख्नुहोस्। HP वा shaft-output nameplate सीधै नराख्नुहोस्। खाली वा 0 राखे head model प्रयोग हुन्छ।Use measured running input or rated input power, not HP or shaft-output kW. Enter 0 to use the head model.

बिजुली दरElectricity rate

Rs/kWh

आफ्नो हालको bill मा थप युनिटलाई लाग्ने दर राख्नुहोस्।Use the rate that applies to added units on your current bill.

महिनामा कति पटक भर्ने?Fills per month

पटकfills

भर्ने समय र खर्चFill time and cost

एकपटक ट्याङ्की भर्नOne tank fill 25.0 min 0.125 kWh · Rs 1.25

महिनाको ऊर्जाMonthly energy3.75 kWh

महिनाको खर्चMonthly costRs 37.50

पानीमा जाने powerHydraulic power0.131 kW

Head model को inputHead-model input0.262 kW

हिसाबमा प्रयोग भएको powerPower used for cost0.300 kWentered electrical input

देखिएको समग्र efficiencyImplied overall efficiency43.6%

यो अनुमान होThis is an estimate

Flow र head चल्ने point सँग बदलिन्छ। Voltage, pipe friction, pump wear र tank को बाँकी पानीले वास्तविक समय र खर्च फरक पार्छ। यो pump selection, wiring वा safety design होइन।Flow and head change together at the operating point. Voltage, pipe friction, wear, and remaining tank water change the real result. This is not pump selection, wiring, or safety design.

हिसाब कसरी हुन्छ?How the calculation works

समय volume र flow बाट आउँछ। पानीमा जाने power कुल dynamic head बाट आउँछ। खर्चका लागि motor को वास्तविक electrical input सबैभन्दा उपयोगी हुन्छ।Time comes from volume and flow. Water power comes from total dynamic head. Actual motor electrical input is the most useful basis for energy cost.

fill time (min) = tank litres ÷ flow (L/min)
flow (m³/s) = L/min ÷ 60,000
hydraulic power (kW) = 1000 × 9.80665 × flow (m³/s) × head (m) ÷ 1000
estimated electrical input (kW) = hydraulic power ÷ overall efficiency
energy per fill (kWh) = electrical input (kW) × fill time (hours)
cost per fill = energy per fill × Rs/kWh
monthly cost = cost per fill × fills per month

Motor input 0 राख्दा खर्च head र efficiency बाट अनुमान हुन्छ। Input राख्दा खर्च त्यसैबाट आउँछ, अनि head model छुट्टै जाँचका रूपमा देखिन्छ।With motor input set to 0, cost uses the head-and-efficiency estimate. With input entered, cost uses that value and keeps the head model as a separate check.

नमुना हिसाबWorked example

1,000 L खाली भाग, 40 L/min flow, 20 m कुल head, 50% efficiency, 0.30 kW मापन गरेको input र Rs 10/kWh मानिएको छ। महिनामा 30 पटक भरिन्छ।Assume 1,000 empty litres, 40 L/min flow, 20 m total head, 50% overall efficiency, 0.30 kW measured input, Rs 10/kWh, and 30 fills per month.

1,000 ÷ 40 = 25.0 minएकपटक भर्ने समयtime for one fill

1000 × 9.80665 × (40 ÷ 60,000) × 20 ÷ 1000 = 0.131 kWपानीमा जाने powerhydraulic power

0.131 ÷ 0.50 = 0.262 kWhead model बाट inputhead-model electrical input

0.30 × (25 ÷ 60) = 0.125 kWhमापन गरेको input बाट एकपटकको ऊर्जाenergy per fill from measured input

0.125 × Rs 10 = Rs 1.25एकपटकको खर्चcost per fill

Rs 1.25 × 30 = Rs 37.50महिनाको अनुमानित खर्चestimated monthly cost

स्रोत र मान्यताSources and assumptions

US Department of Energy, Improving Pumping System Performance, second edition, checked 27 Aug 2026. The sourcebook treats flow, head, and motor power as fundamental pump-assessment inputs, explains pump efficiency as fluid power divided by shaft power, and requires the pump curve to relate flow and head.
Oklahoma State University Extension, Irrigation Pump System Testing, checked 27 Aug 2026. It defines total dynamic head as elevation, pipe resistance, and end-use pressure, and compares water power with measured electrical input to estimate overall efficiency.
NIST Guide to the SI, Appendix B.9, updated 18 Aug 2025 and checked 27 Aug 2026. NIST lists litre, cubic-metre, and flow conversions used by the calculator.
Nepal Electricity Authority, Consumer Tariff Rates, checked 27 Aug 2026. Enter the current marginal Rs/kWh from your own bill because tariff slabs and consumer categories differ.

पानीको density 1,000 kg/m³ र standard gravity 9.80665 m/s² मानिएको छ। 50% efficiency र Rs 10/kWh उदाहरण मात्र हुन्, आफ्नो pump test वा curve र bill अनुसार बदल्नुहोस्। Tank को shape चाहिँदैन, खाली volume चाहिन्छ। Cost मा service charge वा demand charge जोडिएको छैन।The model uses water density 1,000 kg/m³ and standard gravity 9.80665 m/s². The 50% efficiency and Rs 10/kWh defaults are examples, so replace them with your pump test or curve and bill. Tank shape is irrelevant when empty volume is known. Cost excludes service and demand charges.