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Typical cost range for adding or replacing a 2-pole 220 breaker generally falls between $85 and $680, with most residential installations landing around the $125–$250 mark for a standard 20–30A breaker. For higher amperages, AFCI/GFCI protection, or difficult access panels.
Annual O&M costs for floating solar power plants are estimated to be 2-5% of capital costs. This is lower than ground mount systems as the water environment reduces soiling and allows natural cooling of panels. Costs involve periodic cleaning, component replacement, insurance etc.