I think we're having several language problems here aside from the 'hybrid' inverter issue.
Is your Mum trying to power her whole village? 50kw is a LOT of power, especially for a home in Africa. I've got two households with modern amenities, TVs, computers, refrigerators, deep freeze, and AC (though we seldom need it), and our power usage averages 15 kilowatt-hours per day which we achieve with a 6 kilowatt system. Yes many large modern homes in the USA use more than we do and average about 30 kilowatt-hours per day. The per capita electrical consumption in Ghana appears to be about 308 killowatt-hours per year... and you seem to be shooting for somewhere around 18,000. Your Mum is lucky to have so much stuff to use the same electricity as 58 of her fellow Ghanans... or maybe we've got a decimal out of place? If you really need 50kwh/d we'll all be glad to help you - just trying to make sure we don't steer you wrong by a factor of ten.