TSConfig and Buck Boost DC DC 50A

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thronger asked May 8, '24

TSConfig and Buck Boost DC DC 50A

I have bought a narrowboat with a Victron power system, including a 12V starter battery and 24V Tesla house battery bank. It uses a Buck Boost DC DC Converter to charge from alternator/starter battery to the house battery. Strangely, the Buck Boost input terminal voltage is tied to the output terminal voltage (I.e. house battery 24V), such that when I reconnected the input to the starter battery, it blew the 50A fuse. No matter what I do on TSConfig, the input voltage is stuck to the output (as measured by multimeter and TSConfig). Has my Buck Boost shorted itself, or is it simply a case of the wrong Voltage default being set I.e. 24 to 24V, instead of 12V to 24V)? I can’t find on TSConfig where to make this setting though? I suspect the Buck Boost is busted, but could also being doing something silly. Help would be appreciated.

buckboost tsconfig

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thronger commented · May 24 at 07:42 PM

See my latest TSConfig settings. Help on the float and fully charged numbers would be much appreciated!

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Answer 1 · 2024-05-08T13:26:37Z

kevgermany answered · May 08 at 01:26 PM

There's a page in the manual showing where input and output voltage are set.

You can download the manual.

https://www.victronenergy.com/dc-dc-converters/buck-boost-dc-dc-converter-25a-50a#manual

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thronger commented · May 10 at 04:36 PM

Would anyone happen to have the actual TSConfig manual? Not the Buck Boost manual. I don’t think the help hints in the TSConfig software are enough to adequately program the Buck Boost. Surely there is a detailed TSConfig manual?

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Answer 2 · 2024-05-10T17:43:25Z

Alexandra answered · May 10 at 05:43 PM

@Thronger

Walkthrough here

https://youtu.be/vCOJ3nBFpIM?si=9z8wrVjRhBKycVSn

Time 2.45

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thronger commented · May 10 at 06:38 PM

Thanks but this video is for a 12v to 12v converter setup. I need help in the 12v to 24v setup,

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Answer 3 · 2024-05-10T17:46:22Z

Matthias Lange - DE answered · May 10 at 05:46 PM

What happens if you disconnect the output?

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thronger commented · May 10 at 06:39 PM

Then the output imitates the input exactly. 12v both sides. When I then connected the output to the 24v battery, the 50A fuse on the 12v side blew.

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Matthias Lange - DE ♦ thronger commented · May 10 at 06:51 PM

My guess is that the BuckBoost is defective and needs to be replaced.

You should contact the seller of the boat or you use the serial number of the device to get in touch with the Victron distributor that sold the device.

https://www.victronenergy.com/support

https://www.victronenergy.com/support-request

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Answer 4 · 2024-05-24T19:36:49Z

thronger answered · May 24 at 07:36 PM

Good news! I have replaced the Victron Buck Boost 50A DC DC Converter with a brand new one. GBP650 later mind you! And it now works a treat. The previous narrowboat owner must have blown the last one somehow.

I still think the instructions for TSConfig are very minimal and insufficient. For instance, for my new converter the TSConfig software is insisting that I input float and fully charged voltages. Whereas my Tesla batteries already have a BMS which controls these things. But I don’t I know how to turn off these items in TSConfig! Which is frustrating.

Thanks to everyone that tried to help.

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