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Going to a larger converter won't hurt but it may take more space. If you are planning on increasing the size of your battery bank or planning to increase the battery drain by installing some high current item it may make sense, but if you are happy with what you have you probably won't benefit by a larger converter. The current drawn by the batteries is determined by the battery state of charge, not by the current rating of the charger.
Installing a larger converter may require you to install larger wiring to handle the additional current and will probably cost more. when I changed converters the current drain increased by quite a lot since I replaced an old single stage converter with a modern 3-4 stage. The old wiring was #8 wire and I replaced it with #4 wire, partly because the current increased from about 5A to 30+A, and also to decrease the voltage drop.
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