When the supply voltage drops below 10. 2V, the yellow light emitting diode VLi light, suggesting that storage pool can not continue to discharge.
When the voltage exceeds 16. 2V, the yellow, green and red light-emitting diodes VLi ~ VLa are light, suggesting that must immediately stop charging or reduce the charging current. When the voltage is within 10.2-16. 2V, the yellow and green light-emitting diode VLi, VL2 light.