Ampera/Volt DCDC or APU

arber333

I got from the salvage a perfectly good DCDC unit. After some searching i found on EVTV forum information what to feed into CAN bus to get the unit to start. There is a wiring for the LV connector as well as HV. My unit is P/N MSE465D and has a tail of HV wires instead of connector on case.

IMG_20180924_175240_HDR

Chevy_Volt_DC-DC_documentation_12_29_2014

  1. To start we have to first connect Enable(5) and Auxiliary(10) wires inside LV connector to 12V from a battery source. Beware! Negative pole of 12V battery has to be connected to the GND of the connector of the DCDC output so connector has the same reference as the output.
  2. CAN H(3) and CAN L(2) connect to CAN network with 120R across to terminate it. CAN speed is 500kbps.
  3. CAN ID is 01 D4
  4. Msg is A0 B2 in 100ms period
  5. A0 is signal to star, to signal DCDC off just send 00 instead A0
  6. B2 means 14Vdc output and likewise AF means 13,8Vdc

DCDCpins

Pin 1               termination resistor

Pin 2               CAN Low

Pin 3               CAN High

Pin 4               NC

Pin 5               Ignition

Pin 6               termination resistor

Pin 7               CAN Low (same as pin 2)

Pin 8               CAN High (same as pin 3)

Pin 9               NC

Pin 10             Accessory

In case after start we remove CAN signal DCDC goes to 13,5Vdc and stays that way providing current until 12V signal is removed from Enable(5) wire.

IMG_20181017_211640_HDR

To provide signal on CAN line i used CANALYST II gizmo which comes with its own interface. It is capable to receive on one channel and transmitt on another.

On my test it provided 14V for a string of 9x H4 dual light bulbs each drawing 10A. So in all it was providing 90A at 14Vdc = 1260W!!! It did got warm to touch, so i will next install one 12V 120mm fan to provide some cooling to the heatsink.

4 thoughts on “Ampera/Volt DCDC or APU”

  1. PAUL YOUNG March 13, 2021 / 2:22 pm

    Do you have a .ino arduino sketch to run this?

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      • Paul March 13, 2021 / 10:32 pm

        Thanks for responding. I’m going to use it on my Teensy 3.2 that has a can transceiver connected.

        I just want to send simple command to enable the APU to produce 13.8 v

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      • arber333 March 13, 2021 / 11:21 pm

        Yes but for this DCDC you need to send telegram at 500kbaud and at a rate of 100ms which is a bit faster than most telegrams.
        You need to send 01D4 A0 B2. This will make 14V.
        If you need to make 13.8V you send AF instead of B2.
        And if you only need 13.6V you simply stop sending CAN msg and DCDC will drop to 13.6V.

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