" I have 8 100watt/12 volt panels ……"
I have seen some 100 Watt panels advertised as 12V, but most actually put out somewhere between 21 and 26 "open Volts" (just measured with a meter and not connected to anything). If there is no data plate on your panels that tells you the open voltage, then you need to measure it because it is important to size your controller.
For example if your cells actually put out 26 open volts, and you had 4 in series, then a 100 Volt controller wouldn't be big enough.
But here's the thing, if they only put out an actual 12V open volt, then 4 in a series would not be enough to charge a 48V battery pack, even a lead acid, you would need a minimum output of 51.8 to charge lead acid (and it would take a loooong time).
So if your 4 panel strings are capable of around 100V, then you probably gonna want a 150V 20A controller (20A because 800W/48v=16.66A).
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