Is there connectors to run 4 panels in a series

To run four panels in series, You would connect the positive of one panel to the negative of the next panel and continue this process until you have one positive and one negative lead. Then you would need a negative and positive homerun lead to connect these to a combiner box or whatever

Are these the equivalent of AVG 8 or 10 or 12?

See this chart: https://www.bluesea.com/resources/1437 For critical circuits (like power systems that require less than 3% voltage drop), using the largest indicated wire size (6mm^2 or 10GA) would restrict 12V applications to round-trip circuits of 60ft @ 5A (60W), 30ft @ 10A (120W), and no more than 20ft @ 15A (180W). "Round-trip" means adding up the lengths of both the positive and the negative feeds - so the actual length of 10GA duplex wire to handle a single solar panel feed of 175 watts would be no more than 10ft. If one additional solar panel is added in parallel, the circuit must now be able to handle 350 watts, or 30A (per P = V * I). While 10GA wire is capable of handling this load, the 3% voltage loss rule now reduces the maximum distance between panels and load to 5ft. Even if the wire is able to handle the amps, the voltage drop specification is equally important, especially in this case. Solar panels typically feed into multi-stage battery charging systems, which can be extremely sensitive to minor differences in voltage levels (that's how the charger knows how much power to send to the battery). Excessive voltage drops due to insufficiently sized wiring can make the difference between healthy batteries that are fully charged and maintained at a float level of 14.4V, and ruined batteries that were overcharged because the charger couldn't get above 14.0V. The 3% voltage drop value represents this precise difference (between 14.4V and 14.0V).

Do these connectors have a "max amp" rating?

Hi customer, the max amp (Rated current) of these connectors is UL 25A or TUV 30A, the rated voltage of these connectors is UL 600V DC or TUV 1000V DC Maximum. Which standard you choose is according to your location or your habit, usually, people in US choose the UL as the standard, people in Europe choose TUV as the standard.

What connects do i need to add 2(two) 300w/24v panels in series ?

This solar branch is made for connecting panels in parallel. Most batteries have PWM charge controllers, which can use only parallel connections. If you have a battery with an MPPT charge controller, you can hook up either way, parallel or in series. For series, you probably won't need an adaptor, as long as your panels have the normal male/female connectors and you have an extension cord with the same connectors that go to your battery. They recommend though, that you have some fuses in between along the way, in connecting the red or positive cables, if you are hooking in series. For series you connect your two panels together with one male and female. The other male and female from each will go to the charge controller or battery. I would Google the connections before actually doing it. But for series, you don't need the solar branch connectors.

Manufacturer	BougeRV
Item model number	ISE039
Package Dimensions	12.6 x 5.89 x 2.11 cm; 100 g
ASIN	B07DJ5PHSB

Branch Connectors Connectors Y Connector in Pair MMF+FFM for Parallel Connection Between Solar Panels

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