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--- electrical:12v:b2b [2024/05/17 11:28]
frater_secessus [Renogy]
+++ electrical:12v:b2b [2024/06/02 20:28] (current)
frater_secessus [Renogy]
@@ Line 32: / Line 32: @@
 See [[electrical:12v:mandatory_dcdc|this companion article]]
+==== triggering / isolation ====
+The general idea is to feed power from the chassis (usually the starter battery) to the house battery **only when the alternator is making power**, and isolate the two from each other when it is not.  The DC-DC will handle this in one of two ways:
+  * **voltage sensing** - watching chassis voltage like [[electrical:12v:alternator#voltage-sensing_relays|a VSR]]
+  * by receiving a **trigger signal** (AKA "D+", "IGN", "ignition", etc) from the chassis:  signal = ON, no signal = OFF.  This method requires the user to find a chassis circuit that has power only when the key is turned.   Caveat:  leaving the key in the ACC ("accessory") position can trick the DC-DC into starting before the engine is running;  so don't do that.
+Product documentation will tell you how the unit is triggered.((sometimes both methods are used together))
 ===== sizing =====
@@ Line 163: / Line 172: @@
 This version is for both **12v and 24v banks**.
-The [[https://www.renogy.com/renogy-12v-24v-ip67-50a-dc-dc-battery-charger-with-mppt/|RBC series 50A charger]] has a 50V PV input limit and built-in bluetooth.  It can also boost 12v panel voltage to charge 24v banks.  A RBC30 is reported to exist.
+The [[https://www.renogy.com/renogy-12v-24v-ip67-50a-dc-dc-battery-charger-with-mppt/|RBC series 50A charger]] has a 50V PV input limit and built-in bluetooth.  It can also boost 12v panel voltage to charge 24v banks.
+>> Ensure that the open circuit voltage of the solar panel/solar panel array does not exceed 50V
 Update:  [[https://store-fhnch.mybigcommerce.com/content/RBC2125DS-21W/Manual_RENOGY%2012V%2024V%2050A%20Battery%20Charger-2.pdf|the manual]] has been updated.
@@ Line 179: / Line 190: @@
 The D**1**S series appears to be a DCC charger with higher PV input limits:
->> For [the] 30A battery charger, ensure that the working voltage of the solar panel / solar panel
+>> For [the] 30A battery charger, ensure that the working voltage of the solar panel / solar panel array does not exceed **30V**. For [the] 50A battery charger, ensure that the working voltage of the solar panel / solar panel array does not exceed **50V**.
-array does not exceed **30V**. For [the] 50A battery charger, ensure that the working voltage of the
-solar panel / solar panel array does not exceed **50V**.
 [[https://www.renogy.com/content/RBC3050D1S-G1/RBC3050D1S-Manual.pdf|manual]]
@@ Line 294: / Line 303: @@
 {{ https://www.srnesolar.com/wp-content/uploads/2020/10/MPPT-Solar-Charging-Controller-MD1250N05-3.jpg?150}}
-SRNE makes [[https://www.srnesolar.com/product/12v-mppt-solar-dc-charging-controller-50a-md1250n05|30A and 50A combo unit]] similar to the Ring and Kisae. Since SRNE makes things that are rebadged by other sellers it is possible they are the original manufacturers.  The BT dongle appears to be the same as the EpEver and Renogy models.
+SRNE makes [[https://www.srnesolar.com/productdetail/DC-DC-Charge-Controller-MD12V.html|30A and 50A combo unit]] similar to the Ring and Kisae. Since SRNE makes things that are rebadged by other sellers it is possible they are the original manufacturers.  The BT dongle appears to be the same as the EpEver and Renogy models.
   * output rating based on solar.  30A will actually do 35A from alternator, 50A will do 60A.

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