When adding panels does not increase the output current from a CC, the first thing to look at is whether you are in the current-limited BULK stage or the voltage limited ABSORB phase. If you are in ABSORB the output current of the CC may be determined by how much the batteries can take in rather than how much the CC can put out.
If you can turn on a large load on your battery, do that and see if the current out of the CC does increase when you add the additional panels.
If you can turn on a large load on your battery, do that and see if the current out of the CC does increase when you add the additional panels.
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