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lifestyle:faq_solar_generator [2023/09/24 20:45] frater_secessus [Specifications] |
lifestyle:faq_solar_generator [2023/09/24 20:54] frater_secessus [capacity] |
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We are most interested in | We are most interested in | ||
- | * how much capacity the bank has (in Watt-hours, Wh) | + | * how much capacity the bank has (typically |
* charging limits | * charging limits | ||
* by car adapter (typically ≤120w because of limitations of the ciggy port) | * by car adapter (typically ≤120w because of limitations of the ciggy port) | ||
Line 58: | Line 58: | ||
==== capacity ==== | ==== capacity ==== | ||
- | |||
- | Ah are often expressed as mAh. Which is more impressive, 33Ah or 33, | + | Capacity is most often listed in Wh (watt-hours), |
+ | Nefarious marketers sometimes multiply each cell's Ah rating times the number of cells, resulting in a 3x inflation of Ah rating. | ||
- | The 33Ah **capacity** lead-acid battery in the example above is stated as 400Wh.((volts x Amp-hours = watt-hours)) | ||
- | Nefarious marketers sometimes multiply each cell's Ah rating times the number of cells, resulting in a 3x inflation of Ah rating. | + | === usable capacity === |
- | On the upside, they have almost no peukert effect and therefore can support heavier loads (at the expense of running time). | + | |
+ | Most people know that only about 50% of lead batt capacity should be used in order to ensure a long life. Lithium also has a recommended safety margin, 20%. This means 80% of the rated capacity can be used and still hit the manufacturer' | ||
+ | |||
+ | With 320Wh usable we could run the a theoretical 400w inverter at max load for 48minutes. | ||
- | You could run run [[electrical: | ||
==== cell chemistry ==== | ==== cell chemistry ==== |