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<blockquote data-quote="Ded Driver" data-source="post: 514066" data-attributes="member: 12692"><p>yeah CS, although a nominal battery voltage of 12.5V is a fair figure to work on, ~12.8 down to 12V ... at 11.8V your battery is pretty much dead flat, depending on the battery.</p><p>If you use the full Ah capacity of a deep cycle battery, it is pretty much flat.</p><p>.</p><p>The Ah rating is, quote,</p><p>"An amp hour (AH) is a rating usually found on deep cycle batteries. The standard rating is an amp rating taken for 20 hours. What this means for a 100 AH rated battery is this: Draw from the battery for 20 hours, and it will provide a total of 100 amp hours. That translates to about 5 amps an hour. (5 x 20 = 100). However, it's very important to know that the total time of discharge and load applied is not a linear relationship. As your load increases, your realized capacity decreases. This means if you discharged that same 100 AH battery by a 100 amp load, it will not give you one hour of runtime. On the contrary, the perceived capacity of the battery will be that of 64 amp hours."</p><p>.</p><p>The 2.5 days/3.3 days runtime you calculate, is of course for the 12hr period you use. I presume this is night, & you would then rely on solar power to provide at least the 72W required for 12hrs daytime. A 150W panel running at an average of 1/3 output over those 12hrs would be delivering 50W (average), so you would need to use substantially more (maybe 250W or more) to ensure you are getting the 72W minimum required. Its possible for a rainy day to drop your solar panel output more than that.</p></blockquote><p></p>
[QUOTE="Ded Driver, post: 514066, member: 12692"] yeah CS, although a nominal battery voltage of 12.5V is a fair figure to work on, ~12.8 down to 12V ... at 11.8V your battery is pretty much dead flat, depending on the battery. If you use the full Ah capacity of a deep cycle battery, it is pretty much flat. . The Ah rating is, quote, "An amp hour (AH) is a rating usually found on deep cycle batteries. The standard rating is an amp rating taken for 20 hours. What this means for a 100 AH rated battery is this: Draw from the battery for 20 hours, and it will provide a total of 100 amp hours. That translates to about 5 amps an hour. (5 x 20 = 100). However, it's very important to know that the total time of discharge and load applied is not a linear relationship. As your load increases, your realized capacity decreases. This means if you discharged that same 100 AH battery by a 100 amp load, it will not give you one hour of runtime. On the contrary, the perceived capacity of the battery will be that of 64 amp hours." . The 2.5 days/3.3 days runtime you calculate, is of course for the 12hr period you use. I presume this is night, & you would then rely on solar power to provide at least the 72W required for 12hrs daytime. A 150W panel running at an average of 1/3 output over those 12hrs would be delivering 50W (average), so you would need to use substantially more (maybe 250W or more) to ensure you are getting the 72W minimum required. Its possible for a rainy day to drop your solar panel output more than that. [/QUOTE]
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