Monday, October 1, 2018

Re: [Electric Boats] 37ft Sailboat Re-power Project

 

Darin,

It might not be a big deal. One thing I can think of is if you need/care to run your drive motor at full speed you may not have enough volts at lower states of charge. The other thing is anything using the battery will need higher current to meet its power requirements. Again, maybe not a big deal. 
Do you plan to have a generator? If you need to motor against strong currents like you mentioned, you may run low on battery without it. 

Chris

Sent from myPhone

On Sep 30, 2018, at 21:06, D C armyofpenguins@gmail.com [electricboats] <electricboats@yahoogroups.com> wrote:

 

Chris, you may be right.  Thanks for the suggestion.

On Sun, Sep 30, 2018 at 6:08 PM Chris Hudson clh5_98@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:
 

Do you plan to use 15S2P, or 16S2P? I thought 16S was standard for 48 V nominal. Maybe I'm wrong?


Chris

Sent from myPhone

On Sep 30, 2018, at 18:14, armyofpenguins@gmail.com [electricboats] <electricboats@yahoogroups.com> wrote:

 

Hi all, 


I am posting my current project to see if anybody has any thoughts or advice.


Project:  


1972 Buchan 37, kept on Lake Washington (fresh water) entire life, used very little.

WL: 27.3 ft

Cruising speed: 8 kts (efficient, built for racing) 

Beam: 10 ft 

Keel: fin

Displacement: 13,000 lbs

Current ICE: 40hp inboard diesel (to be removed)


Planned Upgrade:


Motor/Controller:  10kW BLDC motor using a kit from Thunderstruck - 10kW (48V)

Batteries: 15S2P LiFeP04 prismatic Calb CA100FI cells (quantity = 30), weight = 226lbs total.  Batteries to be stored in keel where old diesel fuel tanks were previously located.  Battery management system will be used.

House to be served by DC to DC converter for 12V and inverter for 120V AC.  Power use on board includes lights, communication, depth/speed equipment, phone chargers, and occasional microwave use. 


Type of use:


Exploring the San Juan Islands and the Salish Sea (Puget Sound to B.C.).  Occasional vacations up to 1 week.

This should provide about 7.7kWh useable storage assuming 80% depth of discharge.  If I find out I need more, there is space to double the batteries.

Thoughts and reservations:


I considered 72V system (12kW kit) to ensure adequate power and 72V to reduce lines losses, but for safety I like 48V.  Also, at 48V, off-the-shelf equipment are more available such as battery switches.  

The power issue between 72V and 48V remains a concern (getting through Deception Pass comes to mind).  I may just install the 12kW kit so that I can be ready to increase the unumber of cells to get to 72V if I determine later that I need the higher power.  There is room available for the extra cells if needed.


Thanks in advance for any helpful suggestions.


Darin



__._,_.___
Posted by: Chris Hudson <clh5_98@yahoo.com>
Reply via web post • Reply to sender • Reply to group • Start a New Topic • Messages in this topic (4)
Have you tried the highest rated email app?
With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated email app on the market. What are you waiting for? Now you can access all your inboxes (Gmail, Outlook, AOL and more) in one place. Never delete an email again with 1000GB of free cloud storage.

SPONSORED LINKS
.

__,_._,___
Posted by at

No comments:

Post a Comment

Subscribe to: Post Comments (Atom)