Some general points to consider:
- You mention "I got 5p2s", is this a typo? Your diagram shows two arrays, each of 0S5P i.e. no panels in series, all in parallel.
- Assuming you do mean to connect each panel in parallel, you cannot physically connect them per your diagram without additional terminal blocks; each panel only has two output cables, if you connect +ive to +ive, how would you then connect +ive to your SCC? I would suggest either individual cables from each panel to SCC or connect all panels to a +ive and -ive bussbar, then one line from each bussbar to your SCC
- You have each of your batteries connected to busbars, but then additionally connected to each other? This is unnecessary. Perhaps a throwback from a 24V battery system design?
- PWM SCCs are an outdated and inefficient technology. Consider MPPT SCCs.
- You battery monitor's shunt will very likely only connect to the negative line, and will require a separate, fused supply.
- I personally do not believe you need protection devices on your PV-to-SCC lines, shut-off yes, breaker, no (unless you are using a breaker as a significantly more expensive shut-off switch).
- I do not know enough about PV grounding, or lightning arestors to comment on this aspect.
- I don't see an Earth connection going to your consumer panel. You'll need this to ensure the function of any GFCIs. Also, you should target at least 5 times your circuit breaker ampacity rating to ensure a rapid break. For example, for a 16A mains breaker you should target having at least 80A being able to flow to earth in case of an earth short, this means an earth loop impedance of no more than 2.9Ω for a 230V system or no more than 1.5Ω for a 120V system. It is better to keep your earth loop impedance below 1Ω.
Now to your specific questions:
should i use 8 awg wire from panel to panel?
That depends how you connect up your array. If using independant runs from each panel to your SCC, each cable should be specified for Isc +25%. If these cables are in conduit, lie directly on a surface or will experience an ambient temperature of above 30℃ then consult NEC or rate them at least Isc +50%.
If you are using a bussbar, each panel cable should be rated for panel Isc +25% to the bussbar, then array Isc +25% back to the SCC. Same caveats apply as above.
Also remember that MC4 connectors are only rated for 20A. If using the bussbar option above, you will likely need to use an alternative connector, such as a solid copper lug.
There are 2 connectors on back of my panel pos and neg 14g attached to a black box. I will have to remove them to add the 8 awg pv wire.
Do not remove the 'black box'. This will contain your bypass diodes, which are essential to safe operation of your panel.
The wire going to PV to SCC to Bat is all 8 awg
OK, but make sure you consider the caveats above.
I need a 50a breaker from scc to bat and one 150a from bat to inverter for each bank.
You appear to be rating your breakers only on the maximum current expected from your devices e.g. a 50A breaker for a 50A rated SCC, you must also consider the cable. For example, a cable rated for 17A must not be fused higher than 17A. Of course it is just a lot easier to ensure the cable is rated higher than the expected load, but the premise remains valid: it is better to think of fuses etc protecting the cable.
I'll need 50 amp fuses from busbar to bat for each battery so ill need 8.
I personally would not fuse each battery, as they are lead-acid, they will already be in a sealed container and, therefore, inaccessible to any living area. The potential for a short under these circumstances is remote. Of course, each run from the battery bussbar should be fused at the cable ampacity rating as a minimum.
Ill need a battery switcher
Using such a battery switcher makes no sense to me, you are essentially placing half of your solar PV setup 'on the shelf', reducing the power and energy capacity of your system by half. But, I'm sure you have your reasons.
Do i need a ac breakers after the inverter?
Yes, and at least one GFCI/RCD.
So ill need 100amp ac breaker in a panel with some 50a and 30a breakers plus a ac outlets?
No, each circuit should be protected for the ampacity of the circuit cable. Most domestic circuits in the UK are rated for 230V/16A, can't remember if this is a 120V AC system, maybe it is different for US. The primary line cable to your consumer panel should be rated for your inverter rating +25% (e.g. 3,000W inverter will produce 13A at 230V or 25A at 120V). Do not confuse DC Amps (at e.g. 12V) with AC Amps (at e.g. 230V).
I'm mainly concerned right connector types and wire and fuse/breaker sizes.
DC systems tend to use automotive style cable and connectors.
AC (mains) system tend to use residential style cable and connectors. We call the cable 'twin'n'earth' here in the UK, I'm sure the US will have something similar. Connectors tend to screw-terminal.
Edit: Corrected typo.
