What Electricity can two 100w Solar Panels store in a day

 Electricity can two 100w Solar Panels store in a day

12V100W solar panels, the maximum charging current is about 9A, the longest effective light time of the day in Lhasa, China is about 5.5H, other areas according to the light 4h, that is, you can charge into the 4h * 9A = 36Ah more than, even if 40Ah.

That is to say 80Ah battery, if the day discharge more than 40Ah, it is possible to charge not full. In addition, the maximum charging current of lead-acid batteries is 0.3C, that is, 0.3*80Ah=24A, and you can't charge for a long time above this current. It needs to be considered comprehensively.

Solar photovoltaic power generation system design factors need to be considered:

1, need to consider the solar photovoltaic power generation system used in the place as well as the place of sunlight radiation;

2, need to consider the solar photovoltaic power generation system needs to carry the load power;

3, the output voltage of the system, and consider whether to use direct current or alternating current;

4, the number of hours per day the solar system needs to work;

5. the number of days that the system needs to be powered continuously in case of rainy and cloudy weather with no sunlight;

6. Consider the load, whether it is purely resistive, capacitive or inductive, and the size of the starting current.

Extended information about solar energy system

Solar power system AC  is composed of solar panels, solar charge controller, solar inverter and battery bank; solar power system DC does not include solar inverter.

In order to make the solar power generation system can provide enough power for the load, according to the power of the electrical appliances, the reasonable selection of the components. The following is an example of the calculation method with 100W output power and 6 hours of use per day:

1. First of all, the number of watt-hours consumed per day should be calculated (including inverter losses): 

If the conversion efficiency of the inverter is 90%, then when the output power of 100W, then the actual need for the output power should be 100W/90% = 111W; if used for 5 hours per day, then the power consumption is 111W * 5 hours = 555Wh.

2. Calculate the solar panel: 

according to the daily effective sunshine time of 6 hours, and then take into account the charging efficiency and charging process loss, the output power of the solar panel should be 555Wh/6h/70%=130W. 70% of which is the charging process, the solar panel's actual use of power.

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