This reduces costs to a minimum, whilst still increasing the yield!Īlso, I took the values for all our Blue Solar MPPT charge controllers and Blue Solar modules and combined them into a Spreadsheet. You can now for example add the same type of modules in parallel later without the need to change the MPPT charge controller. This Blue Solar MPPT feature is unique and makes the charge controller even more interesting! Thanks to the output power or current limiter, the output power will never exceed the maximum of the controller. In fact we can now put modules in series as well as parallel, which will also increase the input power and flexibility. Basically any module can now be used if it is within the input voltage range of the charge controller. The challenge now, is to match the PV modules to the controller, because we are not concentrating on only ‘12V’ or ‘24V’ modules anymore. For now I will look at the first part, to find out what is possible on the electrical side.īy adding a DC/DC converter in the Blue Solar MPPT controller, the system also becomes more flexible when we look at the input voltage of the controller. Sizing the system can be done electrically to see if the system is allowed and will not destroy any components, when looking at the yield to see how much energy it will produce. If the size of the solar module was already fixed, the yield is now higher in the same system when using an MPPT. If a specific yield is the goal, the 30% higher efficiency of the MPPT will reduce system costs, because the same energy can now be produced with a smaller PV generator.So, with the advent of the newer Victron Energy Blue Solar MPPTs, things changed for the better when compared to PWM solar charge controllers. In the following diagram you can see, the area of the MPP in blue (Vmpp * Impp) is up to 30% larger than the PWM area (Vbatt * ~Isc) within the IV curve. Unfortunately due to the fact, that with PWM controllers the PV module is not feeding the battery from its maximum power point (MPP), the system loses a lot of energy. Life used to be so simple in a 12V battery system you took a ‘12V’ solar module, watched carefully that the maximum PV current would not exceed the charge controller maximum current and the system would work.
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