Solar automatic MPPT charger DC ups and down power supply LT8490 lithium battery 75V/20A
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The default 28.4V value of charging voltage, please note the charge voltage, will be set after delivery, or as already know how to use.
Input voltage 10-75V divided battery board and DC power supply two ways, through short cap switch.
Input current internal control, maximum 20A.
Output voltage 3.6-72V, output current adjustable 0.5-20A
The optional configuration is as follows: * must be confirmed by the customer
Battery type: two kinds of charging methods for lead-acid battery and lithium battery, switching through short cap, short circuit is lithium battery.
Temperature compensation charging mode: the default temperature compensation, the need for external temperature resistance detection temperature, the temperature resistance will be disconnected after the fault can not be charged.
Two way power supply mode: the default is the battery board and DC power supply, two optional power supply for the battery board, parallel scheme is ideal diode, can reduce the loss of 2 parallel battery board. The parallel resistance is 1.5-3 ohm.
Battery board parameters: the default battery board parameter is 16-72V, the maximum current is 20A, and the parameters outside of this will not guarantee the maximization of MPPT. The actual parameter configuration needs complex calculation, and the range of voltage and current value affects the accuracy of MPPT. For example, the maximum current 20A, but the actual use of the maximum no more than 10A, then the current for the 10A will be able to achieve better accuracy. If you use the battery board will not be replaced frequently, advice to inform specific parameters, module parameters configuration, in order to achieve the best results.
Charging time limit: the function is valid only when the DC power input works, and the default has no charge time limit. A direct load on the battery does not require a charge time limit.
1, the input and output fuses prevent accidental connection and other failures.
2, output short circuit protection
3, over temperature fan, over temperature protection 95 degrees
Matters needing attention：
1, the battery board input and DC power input shall not be connected, the DC power supply shall not be connected to the battery board input port
2, the input and output is prohibited to reverse, otherwise it will burn the fuse and even modules
3, under high temperature environment and high current differential pressure environment need derating!
4, MPPT is effective only when the charging power is greater than the input power, otherwise the maximum energy utilization rate can not be reached! For example: the battery board maximum power 450W, but set the charging power of 28.4V*10A, no matter how the MPPT settings are unable to achieve the output power, just like the big horse cart.
Important operating instructions: (improper setting, danger of overcharge)
Due to the existence of battery undervoltage protection function, if the module is connected to the input power, if the output no-load will think the battery fault, and there is no output voltage, then how to adjust the output voltage? Here are a few methods for reference.
1, inform the owner (take message or contact) battery charging voltage and current, will be set before shipment, hand is used. This is the easiest way! (especially the charging voltage is more complicated)
2, the lead-acid battery charging voltage setting method, input power, at this time the output is 0, and the indicator flashing. The output will access the 12V battery or power supply, immediately after the break, to be stable at this time will have an output voltage, a 3-10 ohm load to the output, the output voltage will be increased, at the moment the attention value is output settings. Then adjust the output voltage potentiometer until you want to set the voltage.
3, lithium battery charging voltage setting method: input power, at this time the output is 0, and the indicator flashing. The output of the battery or power 12V access, and then immediately disconnect, to be stable at this time there will be an output voltage value, pay attention to the current value is the output set value. Then adjust the output voltage potentiometer until you want to set the voltage.
The maximum charge current regulation: adjust the voltage, low resistance load resistance or insufficient power supply battery, clockwise to increase the output current.
Use important instructions
1, the reason why the module does not charge
The battery has completed the undervoltage fault of the charging battery, charging time timeout (if set this function) invalid battery temperature (if set this function)
2, failure indicator flashing reason: battery undervoltage, invalid temperature, charging time out of time
3, the status indicator: 3.5 seconds short flash once for fault signal, 3.5 seconds slow flash once normal charge, always bright for charging completed or constant voltage charging.
4, charging stage description:
Stage 0: trickle charging, charging the 20-30% with the maximum charging current until the battery voltage is higher than 70% of the set charging voltage.
Stage 1: constant current charging, charging the maximum charging current until the battery voltage is higher than 98% of the set charging voltage.
Stage 2: constant voltage, charging the charging voltage until the charging current is below C/10.
Stage 3: constant voltage reduction, 2 stage charging is completed after the charging voltage is reduced to 95% (95% change), the battery voltage is greater than the actual charging voltage for charging, stop, until the battery voltage is lower than the value of 95% or greater than the charging current C/5.
Stage 0-3 is suitable for lead-acid battery charging, and stage 0-2 is suitable for lithium battery charging.
A charger for solving one equation of two equations under the explanation
Under certain circumstances, such as illumination, temperature and other factors, without considering the parallel resistance of the battery board, it is assumed that the battery plate is equivalent to the voltage source Vmax of U and the resistor R is connected in series (whether it is equivalent or not, only as the basis of testing MPPT)
The output power is Pout and the output current is Iout
So Po=Io (U-Io*R)
Then, when Io=U/2R, Po has the maximum value.
When I do the test, the actual Io value is only 0.2-0.3A different from the theoretical value (the difference value is brought by the input and output voltage and current testing accuracy, and also has some optimization space.
And U and R remain the same, which is equivalent to solving a single equation of two degree.
The following is the test waveform after startup:
Yellow is the input voltage waveform, green is the inductance voltage waveform.
The input voltage is 35V, then a cycle is started after the switch is switched on, and then 2 disturbances are carried out. The maximum power point is calculated to work stably at the input voltage of 18V.