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Generally, yes as you increase Voltage, you decrease Amperage. Other things being equal the Wattage would remain the same. Some go to 48V or more.
Series panels can have other issues though, such as shading of any small portion of the said string "could" result in a large reduction of output to all panels in a series string.
Unsure of your controllers capacity and you battery bank type and capacity it would be difficult to determine what actual output might be.
You can only shove so much at your batteries at a given rate and temp to avoid overheating damage etc. If your tech thought it should work, go for it.
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