The relationship between the output voltage and current of the panel is as follows: (I = [1 - C1 Isc * * e ^ (U)\/(C2 * Uoc) - 1] C1 = (1 - Im\/Isc) * e ^ - Um\/(C2 * Uoc) C2 = (Um\/Uoc - 1)\/(1 - Im\/Isc) (In) the premise: e^[Um\/(C2*Uoc)] > > 1 Isc: short circuit current Im: maximum power point current Uoc: open circuit voltage Um: maximum power point voltage I: output current U: output voltage When two panels are connected in parallel, calculate the output voltage of each panel based on the Uoc,Um,Isc, and Im of each panel. At this time, the output voltage of the low voltage is used as the output voltage U1, the output current of this road can reach Im1, the output voltage of the low voltage of the road U1, corresponding to its own I-V curve, the voltage U2 '=U1, according to the formula calculated current I2' is the output current of this panel, the total current is Im I2' This way only one of the way to the maximum power point, for the other way is equivalent to a waste of energy, so for the case of multiple panels, the best way is to supply power independently, regardless of series and parallel, the final output power will be reduced
Adding an equalizer problem solves the problem of two different solar panels, charging the same battery, even if it is designed with the same voltage pad, the other transmission current is different, so there must be a balancer, with a balancer, charging is very easy, there will be no other unexpected situations
Solar panels can't charge the battery directly. General solar panels to charge the battery, there are protection circuits and charging circuits, that is, the solar controller has 12V, 24V, 48V, 20A, 30A. Controller protection circuit functions: battery overcharge, overdischarge, output overload, overvoltage, high temperature protection functions. The solar panel is connected together in parallel, and then the battery can be charged, and the light time required to fill the battery is determined by the specific equipment, and the time is uncertain.
In addition, the problem of installing a controller is to see whether you are near the panel power generation system, if you can use it without a controller, if it is unguarded for a long time, you just want to use it at night or install a controller.