Larry,
How large a battery pack do you have on the Andrews?? We have found the old racers such as your boat and the Olson and others are easily pushed and exceed our "cruising boat" computer model.
Typically the Catalina 30 has space for about 300ah at 48v placing the batteries in the space of the old fuel tank and also in the motor compartment.
Mike
Electric Yacht
Mike Gunning