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--- howto:electro:supercapacitor [2024/04/18 10:28] – vytvořeno harvie
+++ howto:electro:supercapacitor [2024/04/21 19:35] (aktuální) – [Greencap 16V 83F (6x 2.7V 500F)] harvie
@@ Řádek 3: / Řádek 3: @@
 ===== Greencap 16V 83F (6x 2.7V 500F) =====
-Each cap can handle 2.7V long term, 2.85V short term
+Each cap can handle 2.7V long term, 2.85V short term. Balancer starts discharging overcharged caps through 1 ohm power resistor once they overshoot 2.8 - 2.85 V.
+Self discharge current is expected to stabilize at relatively low value after 100 hours of being charged.
+  * Absorbtion current (initial)
+  * Leakage current (constant)
-Balancer discharges overcharged caps through 1 ohm resistor set once they reach 2.8 - 2.85 V
 Replacing lead acid battery with supercapacitor
   * UPS (replaced 12V 7Ah)
+    * There is some inefficiency in conversion from 12VDC to 220VAC
+    * UPS stops discharging at 10.2V (under load, which might translate to ~11V with no load)
     * 8W LED was running for over 5 minutes
     * 100W incadescent bulb was running for 30 seconds
-  * Piaggio scooter (replaced 12V 10Ah AGM)
+  * Piaggio scooter (replaced 12V 10Ah AGM, immobiliser has 3mA idle current)
     * Charges to 14.4V (in ~1 minute)
-    * After sitting for 9 hours voltage drops to 12.2V (cranks up)
+    * After sitting for
-    * After sitting for 15 hours voltage drops to 11.2V (cranks up)
+      * 9 hours voltage drops to 12.2V (cranks up)
-    * At 8V (cannot crank up)
+      * 15 hours voltage drops to 11.2V (cranks up)
+      * 22 hours voltage drops to 10V (cranks up)
+      * 34 hours voltage drops to 8.2V (cannot crank up)