The Elco dream has died. We found that we couldn't get the RPM or the power that we needed from batteries. We would have had to fill the yacht with three times as many batteries including batteries under the bunks in the saloon and then we wouldn't be able to charge them with a single 144 Volt charger as we would require three phase A/c power. The cost would have been over US$100,000 and the weight excessive, so we have ordered a Yanmar diesel engine and the Elco EP100 is going on E-Bay. Although it is going back to smelly old diesel we need that for the genset anyway and it is probably "greener" than batteries in the long run.