I can't see how any solar panel can generate 1000v, 24v is the highest I've ever seen in a single panel. You can certainly string them in series to create high voltages though. However I have many times seen their max system voltage quoted as being 1000v, but that's of no consequence in the real world and refers to the insulating properties of the various parts of the panel, for example at 1000v+ you can expect to get arching as various components that are normally not conductive break down and conduct. As to how you will achieve this 1000v outside of a testing lab is not clear, but some commercial systems do get to these levels I think, for example a string of 40 24-volt panels will give you 960 volts (all nominal levels, much higher with no load). There are good reasons for using a voltage as high as possible, but there are dangers involved as well.
Most domestic solar systems are 24 or 48 volts, some go up to 96 and conversely some are 12 volts, those with micro inverters have mains AC levels at the panel. If you stick to the lower voltages (12/24) things are very safe although you can get a buzz from 24. At 48 you are starting to get into the area of getting a nice tingle if you touch the wrong thing, at 96 you have to be very careful.
Regardless of the voltage there are some potentially HUGE currents involved, do not drop a spanner across two wires
Any combination of panels and batteries that are matched (IE all 12/24/48/etc) will "work", it just may not be optimal. For example you can have a 100 panels and a single battery, that's very badly mismatched and the battery will be fully charged by about 6AM, but it will work. Likewise you can have 100 batteries and one panel, that may even be a reasonable option in some weird situation, it's hard to imagine where but it will "work".