This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
electrical:12v:directcharginglfp [2024/03/20 12:07] frater_secessus [assessing your own setup for direct alternator charging] |
electrical:12v:directcharginglfp [2024/06/04 14:35] frater_secessus [testing phase] |
||
---|---|---|---|
Line 279: | Line 279: | ||
* you have a **small or already-overloaded alternator** | * you have a **small or already-overloaded alternator** | ||
* you **already own a DC-DC** | * you **already own a DC-DC** | ||
+ | * your BMS has no low temp charging disconnect and you have no desire to work around that((to be fair, this also rules out DC-DC that lack low-temp disconnect)) | ||
* you **want predictable charging rates**, like 40A over the next hour. DC-DC will provide this((barring interference from big chassis loads, BMS protections, | * you **want predictable charging rates**, like 40A over the next hour. DC-DC will provide this((barring interference from big chassis loads, BMS protections, | ||
* you want **stable charging rates** regardless of state of charge((acceptance will taper in Absorption if present)) | * you want **stable charging rates** regardless of state of charge((acceptance will taper in Absorption if present)) | ||
Line 297: | Line 298: | ||
[Note: | [Note: | ||
+ | ==== assessment phase ==== | ||
- | |||
- | If you are still interested, here is one approach to assessing your setup for direct charging lithium. | ||
- pay attention to the **chassis' | - pay attention to the **chassis' | ||
Line 311: | Line 311: | ||
- now make a **sanity check** about the ability of alternator, your isolator, and your Li battery to cooperate. | - now make a **sanity check** about the ability of alternator, your isolator, and your Li battery to cooperate. | ||
- ensure the **fuse** between your chassis and battery bank is sized so //you cannot draw more than the alternator and wiring can handle// | - ensure the **fuse** between your chassis and battery bank is sized so //you cannot draw more than the alternator and wiring can handle// | ||
- | | + | |
- | - test it with a drive. | + | ==== testing phase ==== |
- | - repeat | + | |
+ | | ||
+ | - if solar or other charging source is present, disconnect other chargers and repeat #1.((other chargers will push up apparent bank voltage, which would decrease current demanded of the alternator)) | ||
+ | - repeat steps with the Li bank at lower and lower states of charge, down to the lowest state of charge you expect to recharge from alternator. | ||
- celebrate | - celebrate | ||
- | **Caveats**: | + | ==== caveats ==== |
* Only alternator charge while driving ([[rv: | * Only alternator charge while driving ([[rv: |