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--- lifestyle:faq_solar_generator [2023/09/24 19:36]
frater_secessus [solar charging limits]
+++ lifestyle:faq_solar_generator [2023/09/24 20:47]
frater_secessus [capacity]
@@ Line 43: / Line 43: @@
 Specs for these devices are often given in nonstandard or even misleading ways.  The following discussion will use the Yeti shown above, although their product description is better than most.
+==== TLDR ====
+We are most interested in
+  * how much capacity the bank has (typically in Watt-hours, Wh)
+  * charging limits
+    * by car adapter (typically ≤120w because of limitations of the ciggy port)
+    * by wall adapter (volts and amps, sometimes the stock wall charger makes lower power than is otherwise possible)
+    * by solar ([[electrical:solar:panels#specifications|Voc]] and input current, which will dictate which panels and how many are suitable)
+  * DC output (typically 10A at 12v)
+  * AC output (given as Watts, the biggest AC loads you can run)
@@ Line 51: / Line 63: @@
-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.
+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]].
 Nefarious marketers sometimes multiply each cell's Ah rating times the number of cells, resulting in a 3x inflation of Ah rating.  \\

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