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electrical:12v:b2b [2024/04/12 21:40] frater_secessus [Kisae] |
electrical:12v:b2b [2024/06/02 20:28] (current) frater_secessus [Renogy] |
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See [[electrical: | See [[electrical: | ||
+ | |||
+ | ==== 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: | ||
+ | * by receiving a **trigger signal** (AKA " | ||
+ | |||
+ | Product documentation will tell you how the unit is triggered.((sometimes both methods are used together)) | ||
===== sizing ===== | ===== sizing ===== | ||
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=== RBC series === | === RBC series === | ||
+ | |||
+ | NOTE: there are two distinct versions of the RBC line. Both appear to have PV input limits higher than 25v found in the older DCC line. Major differences appear to be: | ||
+ | |||
+ | * DS - built-in Bluetooth, support for both 12v/24v banks. | ||
+ | * D1S - no built-in Bluetooth, 12v banks only. Uses traditional DCC case. | ||
+ | |||
+ | |||
+ | == RBC2125DS == | ||
+ | |||
+ | |||
+ | {{ https:// | ||
Note: some manual versions brand this unit as part of the " | Note: some manual versions brand this unit as part of the " | ||
- | The [[https:// | + | This version is for both **12v and 24v banks**. |
- | The existing | + | The [[https://www.renogy.com/renogy-12v-24v-ip67-50a-dc-dc-battery-charger-with-mppt/ |
+ | >> Ensure that the open circuit voltage of the solar panel/solar panel array does not exceed 50V | ||
+ | |||
+ | Update: | ||
== solar+alternator behavior == | == solar+alternator behavior == | ||
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+ | == RBC30D1S and RBC50D1S == | ||
+ | |||
+ | 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 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:// | ||
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This unit also seems to be sold under the Ring and Merlin brands. | This unit also seems to be sold under the Ring and Merlin brands. | ||
+ | |||
+ | |||
+ | ==== LiTime ==== | ||
+ | |||
+ | {{ https:// | ||
+ | LiTime makes [[https:// | ||
+ | |||
+ | * Pv input 13.0v - 26v, max 600w | ||
+ | * Alternator Input Voltage 11.3-24VDC, max 600w | ||
+ | * Smart Alternator Input Voltage 12-24VDC , max 600w | ||
+ | |||
+ | |||
+ | === solar+alternator behavior === | ||
+ | |||
+ | According to the Amazon listing: | ||
+ | |||
+ | > The DC-DC charger will choose the DC input automatically rather than charging the service battery with both the solar and DC inputs | ||
+ | |||
+ | |||
+ | === starter battery maintenance behavior === | ||
+ | |||
+ | > When the starting battery voltage is between 3-12V and the living battery voltage is greater than 12.5V, press and hold " | ||
+ | |||
+ | |||
+ | |||
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{{ https:// | {{ https:// | ||
- | SRNE makes [[https:// | + | SRNE makes [[https:// |
* output rating based on solar. | * output rating based on solar. |