Is this true in a dc system? What if my battery current is negative?
complex task. browse in google and yahoo. that could help!
Current rating of a piece of supply equipment is the maximum current that can be supplied. you may have the capacity to supply 8.75 amps total but your load may draw a lot less than that. like if you fill your cup from a bottle. the bottle may hold 5 gallons but you only use one quarter of a pint to fill the cup. I hope that makes some kind of sense.
I am not sure about your question ? If your Q is, what is the solar panels current output, it is 8.73A regardless of the load. If the Q is, How much extra current is available in this circuit, the answer is 3.58A ( 8.73 - 4.32-.83= 3.58)