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Regen LiFePO4 with PM motor

15332 Views 12 Replies 4 Participants Last post by  riwe
hi guys,

I'm struggling to understand if Kelly PM 48V controller can regen Lithium LiFePO4 or LiFeYPO4 batteries.

I have an parallel hybrid boat with a 18HP diesel on the same axel as the PERM PMG132.
I asked Kelly but I am very confused by the answer:
- they replied that the regen tension is proportional to the generator speed
- they put on their website that the controller "boost the regen voltage to the battery voltage" but that it can't cap the generator voltage if too high.

Has anyone here has a working configuration with Regen and Reverse, a PM motor and 48V LiFePO4 batteries ?

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Thanks for your comments and ideas.

I am French, from France.

I ordered the LiFeYPO4 Winston batteries at, waiting for them.

Sevcon replied they do not have a powerfull enough controller (200A 48V)

I think the solution is actually to disconnect the Motor (as a generator) if it reach a certain voltage, as it is what my current controller is doing.

I'll investigate and let you know

I have a similar setup running a sevcon gen4 controller and a Motenergy PMAC in parallel with a 12hp combustion engine. Regen is tricky and I still have issues with regulating voltage and current. You should know that if you go for Sevcon there is almost no information to be found on how to program them and the CAN interface used for programming is $900.

The setup I'm running now uses 36V and during regen I get about 15Amp's, this could be a lot higher but I don’t have the skills to program the controller.

I'm working on a second drive train and I'll go for the Kelly this time. I'm also going for 48V but I only need aprox. 80 Amps of nominal power.

Im using the LiFeYPO4 Winston batteries in my fiat,, together with the akumon from ev-power. And I'm getting four more for the boat. The akumon board can be used as a safety switch durin regen. If the voltage of each battery exceeds 17V the akumon will trigger a 12V signal that can trigger a relay that in turn disables regen.

Please keep us updated on your findings.

Best regards

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