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--- electrical:12v:battery_monitor [2020/04/15 23:48]
frater_secessus [inexpensive shunts]
+++ electrical:12v:battery_monitor [2020/04/15 23:59]
frater_secessus [Battery monitors]
@@ Line 10: / Line 10: @@
   * a calculation on capacity used/remaining
+For the monitor to keep accurate count, power **from all charging sources** and **to all loads** must pass through its //shunt//, a relatively heavy piece of metal that reacts predictably to current. Typically the shunt is placed between the battery bank's negative post and the systems's "ground".((negative/return side of the circuit))  The monitor display is mounted remotely where it is convenient to view.
 ===== how they work =====
@@ Line 19: / Line 20: @@
   - counts Amps/Watts in and out while below that voltage, thereby calculating the percentage of capacity used and percentage remaining.  This is an imperfect science with lead batteries because 100% SoC is only reliable after a //complete// charge, and because different discharge rates will change the effective capacity.   Think of the monitor as general guidance for lead batteries rather than gospel. Lithium banks will align more closely with what the monitor shows.
-Note:  Watching amps trail off at the end of lead Absorption (endAmps) will also tell you when the bank is [[electrical:12v:charging|fully charged]].  The battery manufacturer will specify something like [[electrical:12v:battery_capacity|C/200]] or C/100 as a sign Absorption is complete.
+Note:  [[electrical:solar:status|Watching amps trail off]] at the end of lead Absorption (endAmps) will also tell you when the bank is [[electrical:12v:charging|fully charged]].  The battery manufacturer will specify something like [[electrical:12v:battery_capacity|C/200]] or C/100 as a sign Absorption is complete.

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