you need to search harder https://www.amazon.co.uk/SUNDELY®-Converter-Modified-Inverter-220-240v/dp/B00KH199O0/ref=sr_1_27?ie=UTF8&qid=1531819247&sr=8-27&keywords=24+volt+sine+wave+inverter
https://www.amazon.co.uk/KKmoon-Power-Inverter-Voltage-Display/dp/B071YZJGBH/ref=pd_sbs_107_1?_encoding=UTF8&pd_rd_i=B071YZJGBH&pd_rd_r=1f44d79e-89a3-11e8-9d53-39714586c431&pd_rd_w=RxoMq&pd_rd_wg=dqDND&pf_rd_i=desktop-dp-sims&pf_rd_m=A3P5ROKL5A1OLE&pf_rd_p=5179604776422437276&pf_rd_r=VYR9GCQWGDM142CCZEJC&pf_rd_s=desktop-dp-sims&pf_rd_t=40701&psc=1&refRID=VYR9GCQWGDM142CCZEJC