PREMIUM 40W 40 WATT SOLAR FAST CHARGER FOR TENNIS TUTOR, SILENT PARTNER TENNIS BALL MACHINE Premium solar Fast Charger for Tennis Tutor and Silent Partner Tennis Ball Machines Generates free electricity to charge tennis ball machine under sunlight - huge cost saving Allow to charge tennis ball machine on tennis court - never be worry about tennis machine running of out power during your training session Able to produce up to 2.29A charging current; Features a trickle charge so you will never overcharge your battery Plug and play - it is so easy to use; Solar panel dimension 26.3inx22.6inx1.57in