Hi Eric,
I hear what your saying about the weight factor. Those batteries are heavy! Price was my concern over weight so we will see if I made a bad call or not. Once I get some time to get some controlled testing done I will add the numbers to this sites Database. I need to get a thru-hull put in for my knot meter. I am using a new knot meter with an old thru-hull transducer from a different brand of knot meter. I think it may be reading high and it cuts out alot as well. I want the numbers to be accurate for the data base.
I usually stop in at two harbors 2 or 3 times in the Summer Eric,
I would love to meet up. Keep an eye out for "Slip'd Away"!
electricboats@yahoogroups.com, "Eric" <ewdysar@...> wrote:
>
> Hi Jonathan,
>
> Thanks for the info. If you ever find yourself on the boat with an hour to kill and conditions too calm for sailing, it would be great if you could do some controlled performance testing. Getting accurate watts to knots is very helpful for others that are considering converting and helpful to you by providing a baseline to monitor your boat's health.
>
> I see that your running four 8D Lifeline batteries. Very cool, 250Ah * 48V is almost 10kWh. Without cabling that's about 640 pounds of storage. That was one of the reasons that I chose LiFePO4 batteries, 8kWH is 200 pounds. Plus there is no place in my boat where I could fit four 8D or ever four 4D batteries.
>
> Your Ericson 27 should have a LWL of 20.5'. I'm surprised that you reported 7kts. My 30' ketch with 25' LWL has never touched 6.5kts in any conditions and can barely hit 6kts under power (5.5kts was top speed with the Yanmar diesel). I look forward to hearing your performance figures under controlled conditions.
>
> If you ever think about heading up to Two Harbors at Catalina, let me know. Maybe we could meet up there, schedules permitting.
>
> Eric
> 1964 Bermuda 30 ketch, 5.5kW Propulsion Marine drive, 8kWh lithium batteries
> Marina del Rey, CA
>
> --- In electricboats@yahoogroups.com, "jonathanheirendt" <jonathanheirendt@> wrote:
> >
> > Hi all,
> > Just returning from my boat in Long Beach. My son and I had a very productive trip! Here are some pictures of how the rest of the installation went:
> > http://groups.yahoo.com/group/electricboats/photos/album/247467376/pic/list
> >
> > The coupling set screw was able to come right out due to the penetrant left on there for several weeks I suppose. After that, the coupling came right of with the puller, No heat. We had to build a new battery box for 2 of the new batteries where the gas tank used to sit. It's all glassed in and very solid. Once everything was in place and hooked up we went for a shakedown cruise around the harbor on the 4th of July.
> > everything worked great! We motored around for about 2 hours and went approximately 4 to 5 miles at speeds ranging from 3 to 7 knots. When we returned to the slip we had drained the batteries to about 79%.
> > So far I am very pleased with the electric Yacht kit and I cant wait to get back to the boat to spend more time on the water!
> > We are planning a trip to Catalina at the end of July so that will be a good test of the sailing charecteristics with the new prop and using a generator to recharge etc.
> >
>
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