Re: [electricboats] 15 KW DC l electric conversikon

Larry,

Really interesting information.

I'm very curious about your sources of materiel (batteries, boxes, BMS, etc) and about your overall design & approach.

In particular it's interesting to me that you employed a waterproofing solution similar to what's used for small packs built from cylindrical cells for thinks like electric bikes; i.e. shrinkwrapping.

ABYC standards require that the batteries be enclosed and insulated from potential short circuiting which it seems your approach probably fulfills.  You might try sending them an email asking the question.  I found them to be responsive.

Do you have four separate BMS units, or are your 12v modules tied together into one system?  Are monitoring individual cell voltages?  I'm curious about how you're connecting the sensing wires to the batteries.  Does your BMS also implement cell balancing?  Are you monitoring cell temperature in any way?

I'm using 16S x 200Ah LiFePO4 prismatics and have also chosen to segregate them into four 12v units.  I'm running the sensing wires through waterproof (Molex) connectors, one connector per 12v group, to facilitate disconnecting and carrying each 4-cell package off the boat for winter storage or servicing.

I've built my 4-cell units into boxes to constrain the cells from expanding during charging and discharging, which understand is important for preventing the internal structural changes that can arise inside an expanding cell.  Do feel the shrinkwrapping you used is strong enough to accomplish this, or did you use constraining plates of some kind inside the package?

I have not yet found a correctly sized box to hold four of the 200Ah CALB cells I'm using.  What are the interior dimensions of the boxes you are using?  Are they hard plastic, or HDPE instead, & wall thickness, plz?

I hope you're not annoyed at all the questions!

[-tv]

Thomas VanderMeulen

"Grace O'Malley"

Cape Dory 27

Monroe, Michigan

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