Answers on a postcard please. :+))

It sounds like a classic case of your employer wanting to do it on the cheap
the result of which could be that you get the blame when it all goes pear
shaped.

The whole job needs to be specified by a specialist professional in the
field, which is not likely to be you average sparky who, with all due
respect to inhabitants of this NG, will no experience in this sort of
installation. If possible get three different quotes for the specification
and the installation of it. Get references for similar work they have done
and take them up.

Peter Crosland.