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definition:battery_dis-_charge_sequence [2018/12/26 00:39] admin created |
definition:battery_dis-_charge_sequence [2020/09/16 21:41] (current) |
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| * active power setpoint (Target active power shown in settings-AC) | * active power setpoint (Target active power shown in settings-AC) | ||
| - | ===== Constant current charge (fast charge) ===== | + | ===== Constant current charge (aka fast charge) ===== |
| When the battery voltage is much lower than constant voltage charging threshold, shown on the HMI as [[Slow charging voltage]], the inverter will charge it in a constant power or constant current mode, limited by the maximum charging current (Max charging current) and the given active power (Target active power) at the same time. The voltage of the battery will rise in the charging process. | When the battery voltage is much lower than constant voltage charging threshold, shown on the HMI as [[Slow charging voltage]], the inverter will charge it in a constant power or constant current mode, limited by the maximum charging current (Max charging current) and the given active power (Target active power) at the same time. The voltage of the battery will rise in the charging process. | ||
| - | ===== Constant voltage charge (slow charge / topping charge) ===== | + | ===== Constant voltage charge (aka slow charge / topping charge) ===== |
| When the battery voltage reaches the constant voltage charge threshold (Slow charging voltage), the PWS2-30K will charge the battery at constant voltage, the charging power and the charging current will reduce gradually till 0. | When the battery voltage reaches the constant voltage charge threshold (Slow charging voltage), the PWS2-30K will charge the battery at constant voltage, the charging power and the charging current will reduce gradually till 0. | ||
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| Example 2. The battery voltage is 600V in initial, the maximum charging current (Max charging current) is 100A, the requested charging power (Target active power) is 50kW, the PWS2-30K will charge in 50kW, because the charging DC current is just $50kW\div 600V=83A$, and as the voltage rises, such as 660V, the power is still 50kW, because the charging DC current is $50kW\div 660V=76A$. But if 670V is the constant voltage charging threshold set by user, when the voltage reaches 670V, the power will reduce gradually till 0. | Example 2. The battery voltage is 600V in initial, the maximum charging current (Max charging current) is 100A, the requested charging power (Target active power) is 50kW, the PWS2-30K will charge in 50kW, because the charging DC current is just $50kW\div 600V=83A$, and as the voltage rises, such as 660V, the power is still 50kW, because the charging DC current is $50kW\div 660V=76A$. But if 670V is the constant voltage charging threshold set by user, when the voltage reaches 670V, the power will reduce gradually till 0. | ||
| - | ===== float charge voltage ===== | + | ===== Float charge voltage ===== |
| - | The float charge is just for lead-acid or lead-carbon battery. For lead batteries, the float charging voltage shall be a little lower than slow charge voltage (topping charge mode), and there is a threshold called " | + | The float charge is **ONLY |
| But lithium batteries shall not be float charged. So care must be taken to these parameters: | But lithium batteries shall not be float charged. So care must be taken to these parameters: | ||
| - | * float charging voltage shall be set same as slow charging voltage\ | + | |
| - | * "current threshold from topping charge to float charge" | + | * **current threshold from topping charge to float charge** (legacy name: equal charge to Float charge current) |
| In order to maintain capability for both lithium-ion and lead-acid (carbon), Sinexcel inverters use above settings to differentiate them. | In order to maintain capability for both lithium-ion and lead-acid (carbon), Sinexcel inverters use above settings to differentiate them. | ||