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<blockquote data-quote="Ded Driver" data-source="post: 513997" data-attributes="member: 12692"><p>CS, you need to determine total power consumption, by adding up the Watts of all units.</p><p>If you had consecutive days with some cloud cover, & the panels put out 1/3 their full power capacity during about 9hrs effective daylight (less in winter), then a 500W panel might give you about 1485Wh (500W x 9Hrs x 0.33).</p><p>Also, you will be unlikely to see a full 500W consistently over 9hrs (~8am to 5pm for rough numbers of usable sunlight) due to the angle of the sun as it traverses the sky.</p><p>500W x 9hrs would be 4500Wh in a perfect scenario, but early morn & late arvo will give a lower power output, & its not enough to keep batteries charged for a 250W/24Hr drain.</p><p>In winter if it was a dark sky & raining all day you would get bugger all charge.</p><p>If say it all draws 250W, running 24hrs/day, that's 250W x24hr = 6000Wh (6KWh) in a full day/night period.</p><p>In a 12V battery storage system, if you use a nominal figure of 12.5V, then 6000Wh divided by 12.5V = 480Ah, drawing at 20A (20A x 24hrs = 480Ah).</p><p> In that scenario you would need 5x 100Ah batteries (or maybe 4x 150Ah) to run your 250W system for 24hrs, if there was NO solar input at all. <strong>But, this would run your 5 batteries flat in 24hrs</strong>. You wouldn't want that happening regularly!</p><p>As you can see, running a big power hungry system needs a LOT of storage if you want to be able to go just 1 full day with no charge.</p><p></p><p>If your CCTV system isn't too far away, you might be better running heavy 12V cables out to the camera system using a battery bank on a permanent 240V charger.</p></blockquote><p></p>
[QUOTE="Ded Driver, post: 513997, member: 12692"] CS, you need to determine total power consumption, by adding up the Watts of all units. If you had consecutive days with some cloud cover, & the panels put out 1/3 their full power capacity during about 9hrs effective daylight (less in winter), then a 500W panel might give you about 1485Wh (500W x 9Hrs x 0.33). Also, you will be unlikely to see a full 500W consistently over 9hrs (~8am to 5pm for rough numbers of usable sunlight) due to the angle of the sun as it traverses the sky. 500W x 9hrs would be 4500Wh in a perfect scenario, but early morn & late arvo will give a lower power output, & its not enough to keep batteries charged for a 250W/24Hr drain. In winter if it was a dark sky & raining all day you would get bugger all charge. If say it all draws 250W, running 24hrs/day, that's 250W x24hr = 6000Wh (6KWh) in a full day/night period. In a 12V battery storage system, if you use a nominal figure of 12.5V, then 6000Wh divided by 12.5V = 480Ah, drawing at 20A (20A x 24hrs = 480Ah). In that scenario you would need 5x 100Ah batteries (or maybe 4x 150Ah) to run your 250W system for 24hrs, if there was NO solar input at all. [b]But, this would run your 5 batteries flat in 24hrs[/b]. You wouldn't want that happening regularly! As you can see, running a big power hungry system needs a LOT of storage if you want to be able to go just 1 full day with no charge. If your CCTV system isn't too far away, you might be better running heavy 12V cables out to the camera system using a battery bank on a permanent 240V charger. [/QUOTE]
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