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--- electrical:12v:b2b [2025/03/10 11:54]
frater_secessus [examples - power stations] added link to solar input limit workaround
+++ electrical:12v:b2b [2025/04/28 20:55] (current)
frater_secessus [Renogy]
@@ Line 118: / Line 118: @@
 === DCC series ===
+**Heads up**:  the specs on the DCC line (30A and 50A) have changed but the model numbers appear to be the same.  Most important change is the PV input voltage limit;  see below. Doublecheck which one you will be getting BEFORE ORDERING if this is a critical spec for you.
 [[https://amzn.to/48L6r1f|{{ https://m.media-amazon.com/images/I/41B+GcTmbyS._AC_UY218_.jpg?125}}]]
-  * DCC50S [[https://amzn.to/48L6r1f|50A model with MPPT charging]]. MPPT input limited to 25v.((per the manual)) - [[https://www.renogy.com/content/RBC3050D1S-G1/RBC3050D1S-Manual.pdf|manual]] (pdf)  Total output is limited to 50A from either independent source (see below).
+  * DCC50S [[https://amzn.to/48L6r1f|50A model with MPPT charging]]. MPPT input limited to 25v on original version and 50v on new version.((per the manual)) - [[https://www.renogy.com/content/RBC3050D1S-G1/RBC3050D1S-Manual.pdf|manual]] (pdf)  Total output is limited to 50A from either independent source (see below).
   * there is no D+ trigger for smart alternators.  Instead, the owner adjusts the cut-in voltage setpoint to make it work as desired:  "...you can connect to DC Home or Core via Bluetooth, and then **adjust the appropriate input voltage value of the charger** according to the characteristics of the working voltage of different types of alternators."((https://ca.renogy.com/renogy-ip67-50a-dc-dc-battery-charger-with-mppt/))
-  * a [[https://amzn.to/3fSFDD2|30A combo model]] is also available
+  * a [[https://amzn.to/3fSFDD2|30A combo model]] is also available.  25v input on older version and 30v input on newer version.
   * low temp charging cut-off supported in Lithium profile when external temp probe is present
   * [[electrical:12v:voltage_sensing|voltage-sensing]] available
@@ Line 141: / Line 144: @@
 This device's behavior regarding solar+alternator charging is widely misunderstood.
-The 50A dual-input charger prefers to charge by solar if possible, up to **50A**.  If it cannot meet charging demands alone and the engine is running it will will charge up to **25A by solar and 25A by alternator**:
+The 50A dual-input charger prefers to charge by solar if possible, up to **50A**.  If it cannot meet charging demands alone and the engine is running it will will charge **≤25A by solar** plus **≤25A by alternator**:
 Consider this snippet from the manual;
@@ Line 160: / Line 163: @@
 Note:  some have reported better alternator charging performance with the D+ (smart alternator) wire connected, even with plain alternators.  Oversizing cables from the alternator may also help. ((https://www.youtube.com/watch?v=LtIe2rIfpW8))
-== disconnecting the solar ==
+== preventing solar from hobbling the alternator side  ==
+Because of the behavior described above, people who want maximal charging can approach the problem one of two ways:
+**Max out the solar side** so it's never failing to make it's fair share.  This would be 400w of panel on the 30A and ~600w on the 50A.
-Because of the behavior described above, people who want maximum alternator charging sometimes add a way to disconnect solar panels.  This is typically done by adding some kind of disconnect on the panel POS wire going to the solar charge controller:
+**Add a way to disconnect solar panels**.  This is typically done by adding some kind of disconnect on the panel POS wire going to the solar charge controller:
   * manual switch

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