Hi,
If you supply goods and the goods remain the in the UK then the Place of Supply of the goods will be in the UK and so UK VAT will need to be charged.
The goods can only be zero rated if the goods are exported.
Please see the guidance below:
Conditions and time limits for zero rating
However if you are providing services upon the goods like maintenance/repairs then this would be a service and the Place of Supply would then be determined by where the customer belongs.
So if the business customer is in Germany then the supply of services would be Outside The Scope of VAT.
Please see the guidance below:
Services supplied ‘where performed
Thank you.