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--- electrical:12v:directcharginglfp [2022/09/17 18:13]
frater_secessus [current drawn expressed as percentage of alternator rating]
+++ electrical:12v:directcharginglfp [2022/09/17 18:24]
frater_secessus [assessing your own setup for direct alternator charging]
@@ Line 97: / Line 97: @@
 === lessons ===
-Don't direct-charge banks that have 2-3x the capacity of your alternator's rating.   Use [[electrical:12v:b2b|a DC-DC charger]], external regulation, or current reduction with resistance as described elsewhere in this article.
+Think twice about  direct-charging banks that have 2-3x the capacity of your alternator's rating.   Use [[electrical:12v:b2b|a DC-DC charger]], external regulation, or current reduction with resistance as described elsewhere in this article.
 Do not idle to charge.
@@ Line 189: / Line 189: @@
     * **if isolator wiring is already present** from a previous bank, test it while using a monitor or BMS info to watch actual current.  You may want to decrease fusing to equal the actual wire rating((rather thant he usual rating + 20%)) during testing.
     * **if starting from scratch** there is less to go on.
-      * In the van-relevant examples above LFP banks typically pull 0.33C, or 33A per 100Ah of capacity.
+      * The most conservative approach would be to size the wiring for 1C (non-critical).
-      * LFP manufacturers typically allow up to 0.5C charging for normal use.  One might
+      * In the van-relevant examples above LFP banks typically pull 0.33C, or 33A per 100Ah of capacity, so it might be acceptable to size them to 0.5C (noncritical).
+      * a set of heavy jumper cables and a clamp-on monitor might help assess max current draw before buying any wiring.
 If you are still interested, here is one approach to assessing your setup for direct charging lithium:

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