invested in mppt solar charge controller batteries
To get the average kw/hr your home requires, simply divide the total kw/hr by the total number of days in the billing period you're looking at. Most utility company billing periods are for 30 days.
By doing that you will know how many kw/hr your solar power for homes system will require each day to meet your dc to ac inverter solar energy needs. If you do this for the whole year, you'll know both your average daily usage and times in which your consumption is likely going to peak. This is essential information for sizing up how many watts your home needs.
You have to confirm that your electricity company is happy to buy back the extra solar power that your solar power system makes. While it is rare indeed for an electricity company to actually pay you for the extra electricity you supply them, most are happy to buy back power up to the extent of your current bill. After that, they will accept it but only under condition that they won't actually pay you for it. You need to check out where your local company stands on this matter.
If you are someone who is choosing to not go fully off-grid (which is perfectly reasonable by the way!) and you haven't invested in mppt solar charge controller batteries to store the extra solar power, then some days you'll be selling your solar energy to the utility company. In the U.S., by law electric companies have to pay you whatever rate you would pay them. On other days, you don't produce enough solar power for homes and you may be buying energy from them. Either way, over the duration of a full year, you want to aim at having your energy bill end up around the zero mark. In other words, you want to have just the right amount of solar power panels, not too many and not too few.
