Thanks. I was thinking it was an hourly measurement. I’m planning a 13.4kwh battery bank so would you get 1 or two? Daily draw is probably 7kwh for what I’m powering but I kind of like the idea of enough pv to recharge fully if needed. What’s your opinion!
Since in real world you will never get the Wattage from the panels as the math shows, more likely you will get 80% of that so I would go with more panels based on worst condition on certain months of the year.
Since you will be using inverter to convert DC to AC, it will have conversion loss, most inverter has efficiency of about 85% that you need to factor that in, I.E. you are pulling 1kW on the AC output side of the inverter, the power draws from the battery will be about 1000W/0.85 = 1176W of power, you will use that calculate estimate run time of your battery bank, so having 1kWh battery and with 1kW of AC load on the inverter, you will not get 1 hour of run time, and BTW you do not really want to draw down the battery to zero any way.
When your batteries is drawn down during the night, you will need to have solar that can supply enough power to the load and charging battery at the same time, I.E. during the day time you consume 1000W every hour for 5 hours = 5kWh for your loads, and you will have about 2.2kWhr (disregard the loss for easy math) to put back into your batteries, so if the batteries are low you may never fully charge your batteries in one day unless you cut down on the load to allow the batteries to be charged back up to full again, you should look to see how much power you are drawing the day and at night so you figure how much power you have left for the next day that you need to put back into the battery, you can also get monitoring system that you can easily see the readout.
You have to excuse my writing since it is my second language, I hope you understand what I try to explain, may be some can do better, sorry.
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