just to let you folks know I had to wait 6 weeks for 20kW and 27.6kW inverters from ABB No suppliers in U.K. Are handling them. There are 2 main ones. They promise 4 weeks but the reality is 6 weeks via ship from Italy. You can however buy reconditioned ones which carry less warranty which are stocked in U.K. - maybe worth considering but if you buy new ones, then 6 weeks will be wait time. If you have farms near you with same inverter system join up and buy a spare one to use on breakdowns. If you miss summer that's 1 year set back, I'm going to pitch this tactic to all my farmers, I would suggest groups no more then 4.