DC SOLAR SUBMERSIBLE PUMP
AC/DC Solar submersible Pump
DC Solar Surface Pump
AC/DC solar surface Pump
Solar swimming Pool Pump
Built-in Controller Solar Pump
Solar Pump inverter
Pump Accessories
Mr Youkee Kong 
50-Acre Mango Orchard Irrigation in Thailand: ZRI Solar Pump Setup & 5-Year Data
50-Acre Mango Orchard Irrigation in Thailand: ZRI Solar Pump Setup & 5-Year Data
1. The farm
1,620 Nam Dok Mai trees on 20 irrigated acres of the 50-acre holding.
| Parameter | Value |
|---|---|
| Location | Ban Pong, Hang Dong, Chiang Mai (340 m elevation) |
| Farm / irrigated area | 50 acres total; 20 acres drip (1,620 trees, 7 m × 7 m) |
| Well | 6" borehole, 62 m deep; static 18 m, dynamic 26 m; yield 25 m³/h |
| Pre-solar | 7.5 HP diesel pump + 10 kVA generator (~400,000 THB/year) |
2. Sizing
Peak fruit-fill demand: 1,620 trees × 55 L ≈ 90 m³/day. A 50 m³ elevated reservoir decouples daytime pumping from 24-hour gravity drip.
| TDH component | Value |
|---|---|
| Dynamic water level | 26 m |
| Elevation to reservoir | +12 m |
| Pipe friction (180 m of 3" HDPE) | +9 m |
| Drip pressure (1.5 bar) | +18 m |
| Safety margin (10%) | +6.5 m |
| Design TDH | 75 m |
Selected the ZRI 4SD24/11 (2.8 kW, 42 m³/h at 75 m) over smaller and larger models. Array: ten Trina 450 W mono panels (4,500 Wp) in two strings of five, Voc 206 V / Vmp 174 V — inside the ZRI PD3000-48 controller's 120–260 V MPPT window. Tilt 18°, true south.
9,720 pressure-compensating emitters (4 L/h, six per tree) hold equal flow across the block.
3. Bill of materials
| Item | Specification | THB |
|---|---|---|
| PV modules | 10 × 450 W mono PERC | 65,000 |
| ZRI pump + controller | 4SD24/11 + PD3000-48 | 113,000 |
| Rack, cables, protection | Galvanized rack, SPD, DC isolator | 50,600 |
| Riser, valves, flow meter | 3" HDPE, electromagnetic meter | 60,700 |
| Reservoir + drip upgrade | 50 m³ tank, 6-zone solenoid | 62,000 |
| Labour, civils, permits | 15 installation days | 92,500 |
| Contingency (5%) | - | 17,000 |
| Gross investment | - | 423,675 |
| DEDE 15% rebate | - | −63,550 |
| Net investment | - | 360,125 |
4. Installation and wiring
The old diesel pump was pulled on a tripod; the ZRI pump was fitted with a brass check valve and 316 stainless safety cable, then lowered on 3" HDPE riser to 30 m depth. Surface pipe ran 180 m to the reservoir. On commissioning day, flow reached 41,800 L/h at midday under clear sky — within 0.5% of the pump curve.
The 4.5 kWp ground-mount at latitude tilt, kept clear of the tree canopy.
5. Five-year performance
| Metric | 5-year average |
|---|---|
| Annual water pumped | ~14,600 m³ |
| Peak daily (April) | ~90 m³/day |
| Flow at 75 m, midday | 41.8 m³/h |
| System availability | 99.4% |
6. Economics and yield
| Line | Value |
|---|---|
| Net investment after DEDE | 360,125 THB |
| Diesel + maintenance avoided | ~400,000 THB/yr |
| Payback | ~11 months |
Consistent drip pressure lifted yield from 58.5 t to 73.2 t (+25%), raised export-grade share from 62% to 71%, and cut reject fruit from 8% to 5%.
Steady pressure moved 25% more fruit and 9 points more export-grade.
7. Certifications and compliance
8. Maintenance and lessons
Wash panels quarterly (restores 8–12% after dust), flush drip filters, and annually test per-string Voc/Isc. In five years the only outages were a controller surge alarm, a seized mechanical flow meter (replaced), a loose wellhead cable and a stuck float. Panels, pump, controller and riser had zero failures.
Quarterly panel washing is the highest-return task in dusty Chiang Mai.
FAQ
How much water does a mango orchard need?
About 55 L per mature Nam Dok Mai tree per day at peak fruit-fill — roughly 90 m³/day for 1,620 trees.
What size solar pump powers a mango farm?
A 2.8 kW ZRI submersible on a 4.5 kWp array through a 3 kW MPPT controller, lifting ~75 m.
What is the payback?
About 11 months after the 15% DEDE subsidy against ~400,000 THB/year avoided.
Do I need a licence?
Yes — DGR abstraction permit and DEDE registration for the subsidy.