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3 Posts
Hey all,
I have been doing some research on EV's over the past couple of months and I feel like I am finally ready to build my project, a small electric boat.
Planning on fitting an electric motor to something small, like a 14' john boat for example and having fun out on the water for a few hours.
I started with the motor and since I'd like the boat to get on plane, I decided a 5KW motor should be able to do the trick. After searching around, I found this one online and priced pretty low. https://www.goldenmotor.com/frame-bldcmotor.htm
Now I am thinking what kind/size battery do I need?
Trying to keep the battery as small as possible I decided to go with 48v and after taking a look at the data curve, I noticed that this thing can draw up to 200A. So using that and assuming I will only be using the motor intermittently and rarely at full throttle, I decided to opt for a 200ah battery. This should provide at least a couple of hours out on the water.
I am interested in building my own battery out of 18650 cells, and upon further research found that this will require between 1000-1500 cells depending on manufacturer (13s, 70-120p)
Now that I have my specs in order, I am interested in adding BMS to the pack so I don't blow up my garage during charging or my boat while I'm on the lake. Problem is, I can't find a BMS that will work for 13s and a draw of up to 200A during discharge.
I figured you guys in the EV conversion world must have some advice that can help a newbie out.
Oh, my background, I have pretty good mechanical and electrical knowledge, but batteries are new to me. And computer programming is basically a foreign language at this point.
Thanks in advance!
Kevin
I have been doing some research on EV's over the past couple of months and I feel like I am finally ready to build my project, a small electric boat.
Planning on fitting an electric motor to something small, like a 14' john boat for example and having fun out on the water for a few hours.
I started with the motor and since I'd like the boat to get on plane, I decided a 5KW motor should be able to do the trick. After searching around, I found this one online and priced pretty low. https://www.goldenmotor.com/frame-bldcmotor.htm
Now I am thinking what kind/size battery do I need?
Trying to keep the battery as small as possible I decided to go with 48v and after taking a look at the data curve, I noticed that this thing can draw up to 200A. So using that and assuming I will only be using the motor intermittently and rarely at full throttle, I decided to opt for a 200ah battery. This should provide at least a couple of hours out on the water.
I am interested in building my own battery out of 18650 cells, and upon further research found that this will require between 1000-1500 cells depending on manufacturer (13s, 70-120p)
Now that I have my specs in order, I am interested in adding BMS to the pack so I don't blow up my garage during charging or my boat while I'm on the lake. Problem is, I can't find a BMS that will work for 13s and a draw of up to 200A during discharge.
I figured you guys in the EV conversion world must have some advice that can help a newbie out.
Oh, my background, I have pretty good mechanical and electrical knowledge, but batteries are new to me. And computer programming is basically a foreign language at this point.
Thanks in advance!
Kevin