Hi Johnathan Thanks for the answer. I was thinking of DC step down converter, something like this one: https://www.ebay.co.uk/itm/333975247309?_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D233199%26meid%3D4a5f8c8cffc04f38bcec788f29e9a74d%26pid%3D101224%26rk%3D3%26rkt%3D5%26sd%3D203555790748%26itm%3D333975247309%26pmt%3D1%26noa%3D1%26pg%3D2047675%26algv%3DDefaultOrganic&_trksid=p2047675.c101224.m-1 Jack