The voltage is dependent on the amount of energy received from sunlight and the amount of current drawn, so it is load dependent. Source: MPPT tracking Many solar panels are watt-rated. Example, in the chart above, if you put the output into a short circuit, it. . The generated power depends on lighting conditions, so either the current and/or voltage is variable. Which one is it? Depending on the load, right? – Eugene Sh. What makes you think it's one or the other? @Trevor, I said "and/or", but really, I'm not sure. This question apparently involves a. . Some key points about current for solar panels: Short Circuit Current (Isc): The maximum current your panel can produce in perfect conditions.