Your problem is complicated. Either you will be on a reliable grid or not. If it is, the utility may or may not allow net metering. If you are not on a reliable grid you will need batteries. I am going to assume you are not on a grid.
My electric kitchen range oven is listed at 4000 watts. it would not be practical to run both ovens simultaneously, and have the solar panels provide the power. I have a 40 panel system which generates about 3000 watts at the best time of day. It starts in the morning with just a few watts, builds up towards noon and falls off again throughout the afternoon. You would need to have batteries to store power when you are using less than the solar panels are producing.
You need to estimate the number of kilowatt hours per day you will use. Each of your electrical appliances should have a tag showing its wattage. Add up all the wattages and hours per day each appliances be used. Divide the grand total by 1,000 and you will have the kilowatt hours (kWh) needed. Just to give you an idea what you are in for a typical car battery might be rated at 120 ampere hours.It would take more than 10-800 AH batteries to power both ovens for about an hour. These could cost about 3500 USD in the US. Knowing the sort of maintenance they might get in Ghana I expect they would have to be replaced every couple of years
If this is a residence, one would expect that it might use 25 to 30 kWh per day. If it is a commercial building I couldn't estimate the usage.
This is getting too long. If I can help further, e-mail me at email@example.com