T-Pain Is On A Boat

Re: [Electric Boats] Battery replacement

James,
Alas, I've been told by CALB that they no longer produce this cell.

Chris

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Posted by: clh5_98@yahoo.com

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

with peak currents from 4 to 8 knots, forcing deception pass in a displacement sailboat is a endeavor in slow torture. I would recommend that you consider your current actions and consider how they could or should change when in a differently-powered boat. e.g. right now you can just kinda go and have enough range to do whatever suits ya… but that will not be the case under electric power, so a paradigm shift in thinking and planning might be enough to make it more effective than anticipated..

-Rob

On Oct 1, 2018, at 4:24 AM, Chris Hudson clh5_98@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:

...
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.

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Posted by: Rob <rob@sail4life.net>

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Re: [Electric Boats] Battery replacement

The simplest way of building a system at 400 amp hours is to use the CALB 400 amp hour cells. That way you only need one monitor and one temp sensor for each 3.2 volts. This makes the system safer with less connections and better monitoring.

James Lambden
The Electric Propeller Company
625C East Haley Street,
Santa Barbara, CA
93103

805 455 8444

james@electroprop.com

www.electroprop.com

On Oct 1, 2018, at 7:09 AM, clh5_98@yahoo.com [electricboats] wrote:

Hi Group,
still researching about battery replacement. I've pretty much decided to go the LiFePO4 route. One question I do have though. I need at least a bank capacity of 400 Ah at 48 volts. I have the choice of 100 Ah cells in a 16S4P configuration, or 200 Ah cells in a 16S2P configuration. What are the pros/cons of these 2 arrangements?

Thanks,
Chris

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Posted by: James Lambden <james@electroprop.com>

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[Electric Boats] Re: Battery replacement

Hi Group,

still researching about battery replacement. I've pretty much decided to go the LiFePO4 route. One question I do have though. I need at least a bank capacity of 400 Ah at 48 volts. I have the choice of 100 Ah cells in a 16S4P configuration, or 200 Ah cells in a 16S2P configuration. What are the pros/cons of these 2 arrangements?

Thanks,

Chris

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Posted by: clh5_98@yahoo.com

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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

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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

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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