Let's assume we have a 60 cell 260W PV panel with the following STC characteristics:
Voc= 38.1V Isc=8.98A Vmpp=31.1V Impp=8.37A
The panel is exposed to direct sun light and standard conditions are present (1000W/m2 and 25C). The panel is connected directly to an automotive type, 12V lead-acid battery without any dc-dc converter. The internal resistance of the battery is 100 milli-Ohms.
What would be the approximate operating voltage and current of the solar panel connected to the battery, assuming it is not fully charged.