lifestyle:faq_solar_generator
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lifestyle:faq_solar_generator [2023/09/24 20:45] frater_secessus [TLDR] |
lifestyle:faq_solar_generator [2023/09/24 20:47] frater_secessus [capacity] |
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The 33Ah **capacity** lead-acid battery in the example above is stated as 400Wh.((volts x Amp-hours = watt-hours)) This is technically correct but mixes units in a way that consumers may not understand. Consumers may also not realize that lead-acid chemistries are usually only drawn down to 50% [[electrical:depth_of_discharge|depth of discharge]], giving an actual usable capacity of 16.5Ah. In addition, lead-acid battery [[electrical:12v:battery_capacity|capacities]] are measured over 20hrs. With our example this means a **10w** continuous DC load in this case, or 9w from the built-in inverter. Loads greater than those will decrease usable capacity due to the [[https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwjNo6ayjbXgAhXJwVQKHZ7xAmAQFjAAegQIChAB&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FPeukert%2527s_law&usg=AOvVaw0guPoMgsy0smO6ISiV1t32|peukert effect]]. | The 33Ah **capacity** lead-acid battery in the example above is stated as 400Wh.((volts x Amp-hours = watt-hours)) This is technically correct (and more useful as lithium cells increase in popularity) but mixes units in a way that consumers may not understand. |
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| Consumers may also not realize that lead-acid chemistries are usually only drawn down to 50% [[electrical:depth_of_discharge|depth of discharge]], giving an actual usable capacity of 16.5Ah. In addition, lead-acid battery [[electrical:12v:battery_capacity|capacities]] are measured over 20hrs. With our example this means a **10w** continuous DC load in this case, or 9w from the built-in inverter. Loads greater than those will decrease usable capacity due to the [[https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwjNo6ayjbXgAhXJwVQKHZ7xAmAQFjAAegQIChAB&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FPeukert%2527s_law&usg=AOvVaw0guPoMgsy0smO6ISiV1t32|peukert effect]]. |
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Nefarious marketers sometimes multiply each cell's Ah rating times the number of cells, resulting in a 3x inflation of Ah rating. \\ | Nefarious marketers sometimes multiply each cell's Ah rating times the number of cells, resulting in a 3x inflation of Ah rating. \\ |
lifestyle/faq_solar_generator.txt · Last modified: 2024/05/12 14:45 by frater_secessus