ive got a clarke ig1000 inverter generator from machine mart.....awesome value for money (specially if you wait for the vat free days),does exactly what you need it to do and the machine mart quarantees are good if you ever have a problem....at the last regional i did there was 6 chargers running off mine,and the tank off fuel lasted 7 hours!
http://www.machinemart.co.uk/shop/pr...nerator-ig1000