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You can add more panels and here are the things you need to be mindful of:
the factory wiring connecting the PV array and the charge controller are likley #10 AWG. It's currrent limit is 30 amps. You should add like panels as the existing. The panels need to be wired in series to keep the current within the 30 amp limitation above. Verfiy the voltage limit of your charge controller and confirm the cumulitve Vmp of all your panels do not surpass the charger's rated voltage.
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SOB
2015 Volvo VNL780 D13, iShift, 32k ET air hitch, Idle Free LiFePO4 APU
16.8KWhr LiFePO4, 2.52 kw solar, 10kva Victron split phase
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