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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.

buckboosttsconfig
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thronger avatar image thronger commented ·

img-2811.jpeg

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

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kevgermany avatar image
kevgermany answered ·

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 avatar image thronger commented ·

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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Alexandra avatar image
Alexandra answered ·
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thronger avatar image thronger commented ·
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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Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

What happens if you disconnect the output?

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thronger avatar image thronger commented ·

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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thronger answered ·

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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