![]() Connect batteries to the charge controllerĢ. Connect PV panel to the charge controllerģ. Connect loads to the charge controller. Sizing the DC charge controller or AC inverter (A, W)ġ. Determine your power consumption (Wh per day/week)ģ. #OFF GRID SOLAR SYSTEMS FULL#Important characteristic is the allowable discharge level (%) of its full charge of capacity (Ah) and the number charging cycles.ġ. PV modules - Buy a good one, failure of one PV module can mean failure of whole system.īatteries- are the weakest point within the PV off-grid systems. In this case for an PV module with 30V/8A, the needed charge controller should withstand 36V and 10A.įor Phocos PWM charge-controllers the max allowed Voc is 41/52Voc in 12/24V systems, and 95Voc for the MPPT and 90Voc for MPS charge controller. This is especially important while selecting the PV charge controllers (its max allowed parameters). ![]() If an PV string will be created and in series connected (several modules in section) the voltage and current adds up (!). ![]() This same in case of panel's Isc, if defined as (eg) 8A calculate as x1.25 and possible occurring may be 10A. Calculate panel Voc x1.2, the Isc x1.25 - for safe buffer under extreme weather conditions (more than STC: 1000W/25C/1.5AM).Įxample: if in the PV solar panel datasheet defined voltage 30Voc, calculate it as x1.2. Voltage refers to PV panels Voc and current, its Isc. The deep discharge protection is an optional feature (but very common), helps to protect the batteries against damage (fully discharged battery may cause its damage).ĭo not exceed the allowed voltage and current of charge controller. The over-discharge protection occurs, when the loads will cause critical/min voltage within the battery. Controls the flow of current to and from the battery, to protect it from over charging after reaching the required voltage within the battery (eg protect against boiling the electrolyte). In general: the simpler the system, the better.Ĭharge controller - high-quality PV charge controller is the most important component within the PV off-grid systems. ![]()
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