campermama wrote:
2oldman wrote:
The 1.8 amps sounds more like the 120v side. 13.2 is more than 70% on any chart I've seen. I did not know any Li battery needed absorption.
Can you please post a chart that shows 13.2v is not 70% for Lithium batteries? If it's not 70% what is it? . . .
Many 12v lifepo4 voltage/SOC charts show 13.20v (resting voltage) as equivalent to 70% SOC. The key here is "resting voltage".
If you're going to use a lifepo4 voltage/SOC chart to determine SOC, you must have zero charge/discharge current (ideally by disconnecting the battery entirely). Then you must let the voltage stabilize to a final resting voltage before taking a voltage reading. Depending on the situation, it can take anywhere from a few minutes to a few days to reach the final resting voltage.
As for 2oldman's comment about lifepo4's not needing absorption---that was the lifepo4 charging philosophy a 2-3 years ago when nearly all lifepo4 converters/chargers were single-stage 14.6v (no absorption or float stage). These days it's common knowledge you can damage a lifepo4 subjecting it to a 14.6v bulk mode indefinitely. Thus, the need for an absorption voltage. Many recommend 13.2v - 13.6v. There are still a lot of single-stage 14.6v lifepo4 converter/chargers on the market. Highly recommend purchasing a 2-3 stage converter/charger instead.