How to choose model for solar pumping system？

If we don’t know pump current, we will make inverter power one level higher than pump power.

Type 1: Pump(3AC380V, work 6 hours per day)

1. Check pump rated specification（7.5kW/380V/18A）;

2. Inverter current = pump current*1.4(18A*1.4A=25.2A);

3. Check inverter rated output current(GD100-PV catalogue Page7 show GD100-011G-4-PV current is 25A);

4. Solar panel power = inverter power*1.4 (11kW*1.4=15.4kW);

5. Solar panel quantity = total solar panel power ÷ solar panel unit power(15.4kW÷300W≈51pcs)；

6. Make solar panel Open-circuit Voltage（Voc 45V） less than 800V, make Max-power Voltage (Vmp 37V) near 550V or more than 550V.(51pcs = 17*3, Voc 45V*17=765＜800V, Vmp 37V*17=629＞550V)；

Type 2：Pump(1AC220V, work 6 hours per day)

1 Check pump rated specification（0.75kW/220V/7A）;

2 Inverter current = pump current* 1.4(7A*1.4A=9.8A);

3 Check inverter rated output current(GD100-PV catalogue Page7 show GD100-1R5G-SS2-PV current is 10.2A);

4 Solar panel power = inverter power * 1.4 (1.5kW*1.4=2.1kW);

5 Solar panel quantity = total solar panel power ÷ solar panel unit power(2.1kW÷300W≈7pcs)；

6 With boost module, make solar panel work in series and total Vmp more than 80V(Vmp 37V*7=259＞80V)；

7 Without boost module we have to make total Vmp around 330V. Then we need 11pcs solar panel(330V÷Vmp 37V = 9pcs)；