Re: [electricboats] Complex design issues

Ok, ball park...  How much is one of these things?    200 pounds doesn't sound bad for a diesel gen.

On Friday, November 29, 2024 at 10:52:46 AM CST, Dan Pfeiffer <dan@pfeiffer.net> wrote:

Is this a Buccaneer 32?

Have you confirmed is actual service the 60 amps at 3.5 to 4 knots?  If you get the reduction and prop sizing right you might do better than that.  I have a similar sized boat (33ft, 12,500 lbs, 28.33 LWL) and at 4 knots I use about 30 amps.

7 to 7.5 kts may not be reachable though.  Not in a practical way.  But I do get to 85% hull speed (apr. 6 kts ) at 100 amps.  

I was planning for a 12kW generator (using same ME1616 motor as generator) but after running for several seasons I think that's overkill.  6 to 8 kW would do what I need.

I would look at a DC generator.  I saw these guys at Annapolis Baot Show.  Very interesting and maybe ahead of the curve in offerings?
https://polarpower.com/marine-dc-generators/#tab-id-2


Details on my installation here (with data):
http://dan.pfeiffer.net/10m/electric_drive.htm


Dan Pfeiffer
 

On 2024-11-29 11:12 am, Dale Shomette via groups.io wrote:

I have a 32' Bayliner sailboat (now dismasted) that I've gutted and am turning it into an electric hybrid. It has an 8 battery (185 a/h 12 volt each) battery bank of AGM Oddysey batteries to power a (to be purchased) ElectricYacht 2.0, 48 volt motor drive system. I have 8 solar panels, 100watts each to augment the two Fischer Panda 48 volt 10kw diesel gen. sets. I've taken the 13' mainmast spar and am stepping it where the main master was, with a 500watt wind generator mounted on top. To flesh it out a bit more, I've installed a separate 4 battery bank forward as the house batteries, with a 200watt PV on the forward cabin top to keep them topped up.

  Having said all that, I'd like to configure the 800 watt set of PVs to meet the 48 (actually need 54-6) volt requirement to charge the 8 battery bank but also maximize amperage. 10-11amps/hrs isn't much to plug into a 370amp bank.

The ElectricYacht will need roughly 60 amp/hr for a 3.5-4knot speed, up to 270 amps/hrs to reach a 7- 7.5 knot hll speed. The gen sets can run the motors by themselves and/or charge the batteries but I would like to get as much quiet time propulsion as possible. The gen. sets only put out 60 decibels of noise but would like to keep their use to a minimum. How would you do the overall PV / wind turbine configuration, and voltage and amperage to the battery bank? Should I utilize one 4  185amp 48 volt bank at a time or use and charge both at the same time? Other insight would be appreciated. Thanks so much.

Dale