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I have no idea of what il is. It is not an accepted term. I suspect you mean Imp (Current @ maximum power point). What is likely escaping you is solar panels are current sources, not voltage like a battery or generator. Unless you have a extensive knowlege of electric circuits there is no way I can explain it to you in a way you would understand.
From a DIY POV there are only two test measurements you can make. For that matter only the same two measurements a professional can make in the field. Those two are Voc (Voltage open circuit), and Isc (Current short circuit). From those two measurements you can determine if the panel is operating correctly or not. As a DIY panel you cannot determine accurately the Vmp (Voltage maximum power), Imp (Current maximum power), and Pmax (Power at maximum power point), but you can estimate them.
So here is where I am going with this. If you have a 36 cells panel with all the cells in series using 6 x 6 cells that are rated at 5 amps, and you measure a Voc of around .67 volt x 36 cells = roughly 22 to 24 volts, and measure around 5 amps Isc then you know your panel is working properly. From that you can guestimate the Vmp to be around .5 volts x 36 cells = 16 to 18 volts, Imp to be .9 x 5 amps (Isc reading) = 4.5 amps, Pmax = Vmp x Imp = roughly 72 to 81 watts.
As I stated earlier you need to first determine the State of Charge of your batteries because I suspect you are chasing ghost and just spinning your wheels chasing a problem that does not exist.
From a DIY POV there are only two test measurements you can make. For that matter only the same two measurements a professional can make in the field. Those two are Voc (Voltage open circuit), and Isc (Current short circuit). From those two measurements you can determine if the panel is operating correctly or not. As a DIY panel you cannot determine accurately the Vmp (Voltage maximum power), Imp (Current maximum power), and Pmax (Power at maximum power point), but you can estimate them.
So here is where I am going with this. If you have a 36 cells panel with all the cells in series using 6 x 6 cells that are rated at 5 amps, and you measure a Voc of around .67 volt x 36 cells = roughly 22 to 24 volts, and measure around 5 amps Isc then you know your panel is working properly. From that you can guestimate the Vmp to be around .5 volts x 36 cells = 16 to 18 volts, Imp to be .9 x 5 amps (Isc reading) = 4.5 amps, Pmax = Vmp x Imp = roughly 72 to 81 watts.
As I stated earlier you need to first determine the State of Charge of your batteries because I suspect you are chasing ghost and just spinning your wheels chasing a problem that does not exist.
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