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With larger battery banks of three or more, as in motorhomes, the HFBE of choice is the HD-1200 (top, center). We've seen improvements of resting voltage of about 0.2 volts even after just a 300-mile trip-or some six hours of driving time-with Canadus' older units on a four-battery setup. That can be a noticeable difference when starting the tow vehicle back up after a few days in camp. Unlike the SD, the HD-1200's much longer wiring is detachable.