pv solar panel
Questions about DV volts to AC volts conversions and how this applies to wattage?
I have some basic questions about DV volts to AC volts conversions and how this applies to wattage. Here is where I will begin I took some of those solar lawn lights removed the PV panels, connected them together and get 15 -18 DCVs but its not enough to even power a single item the runs off of say 12 DC volts. This is because of wattage? I have a digital volt ohm meter and do not know how to test for wattage or amps. I do see mili amps on it I guess but not sure. If a guy was to take a solar panel the could produce say 60 watts how many 12 volt batteries would be needed to power 2 or 3 items that use 120 volts and get converted down to 12 volts. You know like cordless phone charges, routers things like that. So if I have say 4 item on my computers routers etc. how many 12 volt batteries and a panel of what wattage would I need to keep the items running 24 hours a day?
Thanks for your help in advance
Vince
The watt (symbol: W) is the SI derived unit of power, equal to one joule of energy per second. It measures a rate of energy conversion.
You can calculate Watts by multiplying Volts by Current.
Solar cells produce power proportionate to the amount of sunlight and the area of the cell. For this reason, the time of the day is important. Midday, the sun is directly overhead and the sunlight is strongest. Late in the day, the rays from the sun are oblique and are absorbed by the atmosphere. As well, the construction of the cells is also a factor in how much energy they can produce. Some cells are more efficient than others.
Those Solar lawn lights use cheap, inefficient cells with very small area. Don’t expect too much from them. They are only just sufficient for the job they do.
Solar panels are constructed of many cells. Some are made to work with 12v batteries. With an inverter, you could produce 120v directly of the battery. Sixty Watt inverters are quite inexpensive and easily available. Limiting factor on how much power you can consume is how much power you generate. Sixty Watt panels are fairly big (not huge). However, you will need several (or larger panels). Sixty Watts for 24hrs is 1440 Watt/hours. Since you can only generate power for about 8 hours a day, you will need about 180 Watts of panels (but preferably a lot more to give you a reserve and allow for overcast days.
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