Table 1 Operating the two pumps at duty point
From: Selection process of photovoltaic standalone pumping systems
Operating hour | Low radiation day efficiency % | High radiation day efficiency % | ||||
|---|---|---|---|---|---|---|
Operating speed (rpm) | Pump 1 | Pump 2 | Operating speed (rpm) | Pump 1 | Pump 2 | |
1 | 2330 | Not operating | 42 | 2550 | 15 | 41 |
2 | 2530 | 16 | 42.3 | 2820 | 37 | 40.8 |
3 | 2650 | 29 | 43 | 2900 | 38 | 38 |
4 | 2350 | Not operating | 42.5 | 2900 | 39.6 | 39.6 |
5 | 2830 | 37 | 40.5 | |||
6 | 2600 | 27 | 42 | |||
Day eff. | 22.6 | 42.5 | 32.8 | 40.3 | ||