I would like to get opinions on the idea of fitting a 2+1 battery change over switch to my leisure batteries. My thoughts are as follows. 1 Current flow from a solar regulator into a part charged battery is higher than into a more fully charged battery so more power is transferred. 2 Using a battery change over switch I could have battery 1 in service and battery 2 being charged. 3 I would also need a change over switch in the output from the regulator so that it charged the battery not in service. Would there be a power gain using this system?