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electrical:12v:alternator [2019/06/23 18:01] frater_secessus [isolators] |
electrical:12v:alternator [2019/06/23 20:42] frater_secessus [using the coach battery only] |
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===== sizing an isolator ===== | ===== sizing an isolator ===== | ||
- | If an isolator is **oversized** it will cost more for no benefit and will self-consume | + | If an isolator is **oversized** it will cost more for no benefit and will self-consume |
+ | If an isolator is **undersized** (less common) it will not be able to carry enough current, | ||
+ | |||
+ | ==== flooded lead-acid ==== | ||
+ | |||
+ | FLA batteries can accept up to [[electrical: | ||
+ | |||
+ | Example: | ||
+ | |||
+ | |||
+ | |||
+ | ==== AGM lead-acid ==== | ||
+ | |||
+ | Consumer-grade AGM batteries typically will accept C/5 - C/3. | ||
+ | |||
+ | Example: | ||
+ | |||
+ | Note: high-end AGM like Lifeline, Odyssey, Rolls, etc, can pull massive current when charging. 200A+ would be possible for the example bank and could shorten the life of a stock alternator. | ||
+ | |||
+ | |||
+ | |||
+ | ==== lithium ==== | ||
+ | |||
+ | Lithium also has the ability to accept massive amounts of charging. It will do so across the entire charging range, as lithium does not have an Absorption phase the way lead-acid does. | ||
+ | |||
+ | Example: | ||
+ | * Because lithium can use about 80% of it's capacity instead of 50% for lead-acid, 120Ah of lithium is a common replacement for 200Ah lead-acid banks. | ||
+ | * drop-in lithium banks like [[https:// | ||
+ | |||
+ | |||
+ | ==== sudden disconnection ==== | ||
+ | |||
+ | **Sudden disconnection of a large load((including a charging battery)) when the alternator is running** can damage the alternator and any operating chassis electronics. | ||
+ | * an isolator shuts off due to current beyond it's rating | ||
+ | * a BMS shuts off lithium charging. | ||
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===== using the coach battery only ===== | ===== using the coach battery only ===== | ||
- | A simple possible approach would be to replace the starter battery with a marine or AGM battery.((http:// | + | A simple possible approach would be to [[electrical: |
===== further reading ===== | ===== further reading ===== |