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the sealey unit that looks the same is 25w 230v
you also need to know how many Amp Hours your battery is
then you can calculate with something like https://www.donrowe.com/power-inverter-faq-a/258.htm#how_long
mcmyk
@BRM
https://www.demon-tweeks.co.uk/Product.do?method=view&n=1313&g=241353&p=176458&istCompanyId=7bed2d1b-ddc3-469a-b48f-8ad2db8ea4ac&istItemId=xxipaqxplw&istBid=tztx&utm_source=bing&utm_medium=cpc&utm_campaign=PX%20-%20DT%20-%20Shopping%20-%20Generics&utm_term=4582558307028093&utm_content=Motorcycle%20-%20Accessories&gclid=CPnfgbPqhNgCFVeZGwoddGYDjw&gclsrc=ds
it's one of these, but I can't find anything