(19)

(11)

EP 2 805 399 A2

(12)

(88) Date of publication A3: 28.11.2013 (43) Date of publication: 26.11.2014 Bulletin 2014/48 (21) Application number: 13709962.8 (22) Date of filing: 17.01.2013

(51) International Patent Classification (IPC):  H02J 3/38(2006.01) (86) International application number: PCT/GB2013/000018 (87) International publication number: WO 2013/108004 (25.07.2013 Gazette 2013/30)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 18.01.2012 GB 201200791 (71) Applicant: DSM Energy Control Limited Cambridge CB5 8LA (GB)	(72) Inventor: DUFFETT-SMITH, Peter James Huntingdon, Cambridgeshire PE29 2AF (GB)