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electrical:12v:b2b [2024/03/23 19:42] frater_secessus [Victron] |
electrical:12v:b2b [2024/03/30 15:12] frater_secessus [sizing] |
The DC-DC should be big enough to meet your charging targets given the amount of driving you do and the | The DC-DC should be big enough to meet your charging targets given the amount of driving you do and the |
contributions of [[electrical:12v:alt_and_solar|other forms of charging]]. It should be small enough that the [[electrical:12v:alternator_details#current|alternator can provide the power continuously]].((Some DC-DC can be derated in the settings in 5A or 10A increments. IOW, you might run your 50A DC-DC at 35A after observing how the system operates.)) **An oversized DC-DC charger cannot protect the alternator**. | contributions of [[electrical:12v:alt_and_solar|other forms of charging]]. It should be small enough that the [[electrical:12v:alternator_details#current|alternator can provide the power continuously]].((Some DC-DC can be derated in the settings in 5A or 10A increments. IOW, you might run your 50A DC-DC at 35A after observing how the system operates.)) **An oversized DC-DC charger cannot protect the alternator**. |
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| Ah = Amps x hours. If your DC-DC charges at 20A and you drive for 2.5 hours it can replace 50Ah (20A x 2.5 hours). |
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Note that [[opinion:frater_secessus:charging_faster|bigger is not always better]]; different battery chemistries and capacities accept current at different rates. Buying more charging capacity than the battery wants((or should have for its own good, see Li below)) is a waste of money. Buying more charging capacity than your alternator can deliver constantly can overheat/damage the alternator. | Note that [[opinion:frater_secessus:charging_faster|bigger is not always better]]; different battery chemistries and capacities accept current at different rates. Buying more charging capacity than the battery wants((or should have for its own good, see Li below)) is a waste of money. Buying more charging capacity than your alternator can deliver constantly can overheat/damage the alternator. |