Programming a Eltek Flatpack2 2000W Rectifier to a fixed voltage

This info was derived from an existing web thread that was extensive and a bit overwhelming.

Reference thread: https://endless-sphere.com/sphere/threads/ultra-compact-1800w-charger-eltek-programming.71139

In order to do this you need a USB-to-CAN adapter. I purchased one and then a second when the first proved flaky.

The DSM unit I used is based on the Canable 1.0 spec.  I later bought a 2.0 unit after having difficulties with the 1.0 unit.  If buying new, get at least a 2.0 spec device.

I used Cangaroo software (https://www.canable.io). With the Slcan firmware set to 125K baud and extended ID you should see messages streaming from the supply.

Look for a received message like this: 0x05__4400 — the data to the right is the serial number of the unit.

The numbers in the __ position is the ID of the unit. 

Login

Send: Address: 0500480C DLC 8, 16 46 50 02 71 76 00 00

(The 0C is hex 12 in decimal  = ID × 4; the data is the serial number of the rectifier followed by 00 00.)

Permanently change the default voltage

Send: Address: 05039C00 DLC 5, 29 15 00 8A 16

The 03 in the address is the ID of the rectifier.

This sets it to 57.7 volts (value encoded as 5770 decimal → 0x168A, flipped to 8A 16).

After changing the default voltage, power off the rectifier and let it discharge fully, then power it back on to apply the new setting.

Operational note: the rectifier may log out after a timeout on some units; in my experience it remained logged in for minutes.

Use case

I plan to have the inverter signal (via generator start relay) when batteries are low; that relay will power up one or more rectifiers to charge the battery bank.

Images

A pict of one of my flatpack2 rectifiers:

This is the Canable 1.0 spec unit I had.   It was not entirely reliable.
This is a Canable spec 2.0 adapter and this is the one I used.   About $20 off Amazon.
This is the power adapter board I purchased off Ebay from overseas.  It works fine, but there are units available in the US now which include screw terminals for about the same price.