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FAQs Library
Q
How to select battary capacity for BN E series off grid inverter?
2020-11-02
A

It needs to be calculated according to the actual demand of customers. If the customer needs to use 3kW load for 1 hour, then the output power of the inverter should be 3kWH. Due to the inverter's own loss, the minimum full load efficiency is 88%, so the maxmum required battary capacity  is 3kWH/0.88

Q
What is SVC control for GD5000?
2020-10-28
A

SVC(sensorless vector control),Open loop vector control, vector control without encoder.

Q
What is the GD100-PV's MPPT function?
2020-10-28
A

MPPT is the abbreviation of Maximum power point tracking,according to the working principle of photovoltaic panels, the VFD must support the MPPT function to ensure that the photovoltaic panels always work at the maximum power output point, otherwise the photovoltaic panels cannot work at the best status.

Q
How to use GD35's big power model to control smaller motor?
2020-10-28
A

For P00.00 = 1,  SVC1. As you know, the motor's power is too small, compared with inverter, the range is too big. So my suggestions for user's reference.
After auto-tuning, try to adjust P02.07 and P02.08's value a little smaller, don't adjust too big, and see the performance.  Or adjust P03.03 a little smaller, 18, 15, see the performance.
Rotor resistance does not affect the output voltage, but it will make the speed identification worse, which will result in higher or lower actual speed (bigger rotor resistance) or smaller rotor resistance (smaller rotor resistance), too large rotor resistance will also cause control instability, too small rotor resistance may cause insufficient output.
Large leakage inductance parameters may lead to current oscillation.

Q
How to adjust GD20-EU's carrier frequency in the parameters?
2020-10-28
A

The carrier frequency is an important parameter for the VFD operation. If increase it, the output waveform will be better and the electromagnetic noise will be smaller, but it will increase the inverter's operating temperature, poor heat dissipation, and greater leakage current. The factory default parameters have been reasonably set, and adjustments are not recommended. If it is adjusted larger, the inverter needs to be derated for use. For every additional 1k, derate by 10%.

Q
Why use GD20UL to drive the motor, consumes more electricity instead of saving energy?
2020-10-28
A

The inverter itself needs to consume a part of energy. The inverter has a soft start function, which can reduce the starting impulse current of the motor; the frequency can be adjusted to realize the motor speed regulation. When using a inverter, the motor has been working at the rated frequency. In this case, energy saving cannot be achieved. When the water pump or fan is driven by frequency conversion, it can replace the valve to adjust the flow, which can save energy.

Q
How does GD20UL use multi-step speed function?
2020-10-22
A

For example, the parameters are set as follows:
P00.01 1 Terminal control
P00.06 6 Multi-speed setting
P01.18 1
P01.21 1
P05.00 1 HDI selection
P05.01 16 S1
P05.02 17 S2
P05.03 18 S3
P05.04 19 S4
P05.09 1 HDI speed terminal
P10.04 40% S1 on, 20Hz
P10.08 60% S1+S2 on, 30Hz
P10.16 80% S1+S2+S3 on, 40Hz
P10.32 100% S1+S2+S3+S4 on,50Hz

Q
How many kWh can 100AH battary storage?
2020-10-22
A

Generally, the battary voltage is around 14~10V discharging from full to emty. So 100AH*(14+10)/2V=1200VAH=1.2kWH

Q
What's the maximum input voltage fluctuation range for GD5000?
2020-10-22
A

When the input voltage fluctuates by -15% to 10%, the MVD can run at full load, and when the input voltage fluctuates by -35% to +20%, the MVD must run at reduced amount.

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