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Alpine5654 | 06-01-2007 03:31 PM
Question on Solar Panel Rating I may just be a knuckle head, but I can't for the life of me figure out what the rating on solar panels actually means. ex - 100W solar panel means you get 100W of power per Minute/Hour/Day/Week/Month/Year ???? :eek_ma:

Orion | 06-01-2007 04:09 PM
Re: Question on Solar Panel Rating Alpine, It means you get 100W instantanously (under full sun). Watts is the product of volts and amps. 25V * 4A = 100W. Let the panel sit in the sun for 5 hours and you get 500Watt-Hours. Watt-hours (WHrs) is what you use to gauge how much energy you have. 500WHrs will run a 100W light bulb for 5 hours, a 1500W hairdryer for 20 minutes, and a 1W night light for 500 Hours. A battery is rated by voltage (12V lead acid car battery) AND amp-hours (AHrs). Amp-hours is like Watt-hours, a product of current (amps) and time. 500WHr/12V = 41.67AHrs... ...so, your 100 W solar panel in full sun for 5 hours would completely recharge a 12V car battery that is rated at ~40AmpHours with a little to spare. Yeah, so math, but it's just the concept of integrating power (watts) over time to get energy (watt-hours). That help any? Orion

Alpine5654 | 06-01-2007 04:40 PM
Re: Question on Solar Panel Rating Quote:
Originally Posted by Orion (Post 625340) That help any? Orion
Very much so. Thank You!!! I owe you one :beer:

Baphomet Jones | 06-01-2007 06:58 PM
Re: Question on Solar Panel Rating http://www.otherpower.com/ They have some good info regarding battery banks and such, as well as wind turbines and the like. Just thought I'd share!

Alpine5654 | 06-01-2007 09:22 PM
Re: Question on Solar Panel Rating Quote:
Originally Posted by Baphomet Jones (Post 625518) http://www.otherpower.com/ They have some good info regarding battery banks and such, as well as wind turbines and the like. Just thought I'd share!
Thanks! I just purchased a small wind turbine - 1440 watts (don't know at what speed tho). I'm thinking about supplementing with solar also.

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