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1. What effect does a panel's nominal voltage have on the system ? Is a higher nominal voltage selected just so that it can power higher voltage devices ? For example, a 6V panel is chosen over 3V panel because I have a 5W device ?2. What will happen if a panel's nominal voltage differs from the lead acid battery voltage that it is charging ? For example, a 6V panel charging a 12V battery, or vice versa.
3. For battery ratings, I understand that 4.5 AH means that if 4.5A is drawn from the battery, the battery's capacity will be enough to last for one hour. Does this mean that at the end of the hour the battery will have 0 charge left (100% DOD) ? Or am I misunderstanding something ?
Presumably there are high efficiency switched mode chargers which can in take a wide range of input voltages and deliver the correct output for a given type of battery.
I think maybe the output voltage of PVs doesn't change that much with varying sunlight but the internal resistance will drop so that they can deliver more current.