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electrical:12v:b2b [2021/06/05 19:00] frater_secessus [Renogy] |
electrical:12v:b2b [2021/06/21 15:07] frater_secessus [Kisae] |
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- enough //time// at that voltage for the battery to stop accepting much current.(([[electrical: | - enough //time// at that voltage for the battery to stop accepting much current.(([[electrical: | ||
- | DC-DC chargers are often triggered by the IGN circuit, but [[electrical: | + | DC-DC chargers are often triggered by the IGN circuit, but [[electrical: |
Dual-input (alternator + solar) units make charging source decisions that are sometimes quirky. | Dual-input (alternator + solar) units make charging source decisions that are sometimes quirky. | ||
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===== examples - with MPPT ===== | ===== examples - with MPPT ===== | ||
- | Combining the [[electrical: | + | Combining the [[electrical: |
Combo units typically have much **lower maximum panel input voltages** (as low as 23v) than a standalone charge controller would (60v - 150v). | Combo units typically have much **lower maximum panel input voltages** (as low as 23v) than a standalone charge controller would (60v - 150v). | ||
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When the alternator input terminals detect at least 13.2v the charger will be switched to alternator charging.((trigger wire allows use of smart alternators)) | When the alternator input terminals detect at least 13.2v the charger will be switched to alternator charging.((trigger wire allows use of smart alternators)) | ||
+ | ==== Redarc ==== | ||
+ | |||
+ | [[https:// | ||
+ | |||
+ | * [[https:// | ||
+ | * [[https:// | ||
+ | |||
+ | The Redarcs appear to do both buck and boost; | ||
+ | |||
+ | |||
+ | |||
+ | === solar+alternator behavior === | ||
+ | > The unit will always take as much power from the unregulated Solar input as it | ||
+ | can before supplementing that power, up to the maximum rated output, from Vehicle power input((https:// | ||
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[[http:// | [[http:// | ||
+ | |||
+ | ===== gotchas ===== | ||
+ | |||
+ | Observe voltage input maximums on units with built-in solar charge controllers. | ||
+ | |||
+ | Voltage-sensing units((triggered by elevated chassis voltage)) can misbehave when an undersized starter battery charger/ | ||
+ | |||
+ | - starter battery voltage rises from 10A maintainer charging... | ||
+ | - triggering the DC-DC charger... | ||
+ | - which begins pulling up to 20A from the chassis | ||
+ | - pulling down the starter battery since the 10A maintainer cannot keep up | ||
+ | - starter battery voltage drops far enough the DC-DC turns off | ||
+ | - repeat forever | ||
+ | |||
+ | The workaround is to either charge the house battery first or to buy a big enough starter battery maintainer to support both the starter battery and DC-DC charger loads. | ||
===== further reading ===== | ===== further reading ===== | ||
[[https:// | [[https:// |