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electrical:12v:alternator_charging_hvd [2019/04/10 15:12] frater_secessus [how it works] |
electrical:12v:alternator_charging_hvd [2022/07/31 00:33] frater_secessus [solid state isolators] |
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There are scenarios where one might want to prevent a [[electrical: | There are scenarios where one might want to prevent a [[electrical: | ||
- | - the house battery could get overcharged by higher voltages than lead-acid | + | - the house battery |
+ | - the house battery might have a resting voltage high enough to trigger the house side of a dual-sensing relay (LiFePO4) | ||
- the combined circuit can feed higher-than-optimal voltages back from solar charge controller to the chassis' | - the combined circuit can feed higher-than-optimal voltages back from solar charge controller to the chassis' | ||
+ | - a [[electrical: | ||
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===== solid state isolators ===== | ===== solid state isolators ===== | ||
- | Some solid state isolators have a trigger or exciter input; | + | It is unlikely you will need an HVD with a diode-based isolators because: |
+ | |||
+ | - the isolator can't backfeed voltage back to the starter battery, and | ||
+ | - voltage drops up to 1v in the diodes when passing alternator --> isolator --> house bank | ||
+ | |||
+ | But it is theoretically possible alternator voltage is so high that even with the drop you might want an HVD. | ||
Three lug isolators without exciter input might not be usable with HVD. | Three lug isolators without exciter input might not be usable with HVD. |