Float charge for battery

[DTBA]

I have a Small solar charger, but it only has a float setting? Should I put the float lower than 12.8? I have a lead acid battery that I want to replace in it, so I can test the voltage before putting it in. New battery is lithium

 

[Tomtomtom]

No, float voltage should be above 12.8 V, usually somewhere around 13.6 V +/- 0.2 V.

This happens to work well for LFP too, so if it's in that range you'll be fine.

 

[leon.davibe]

Yea would agree set the float to 13.6v if the battery charges full enough during shedding perfect

The charging slows down a lot if the highest voltage you can go is float ie it charges normal and then may stagnate at about 70%
soc on the lithium sure it will get to 100% soc but may take forever (figuratively)

Can then set slightly higher voltages 13.8-14 to hit full SOC easier if you see it slows down too much

One way to test would be to set it to float at 13.6 then later change the voltage to 14.4v and observe how long it takes to charge if it takes long you know it stagnated early

If quick to finish you know it came close to full

I found that if my inverter goes into float prematurely (common axpert problem -float bug)

Then i end up at 70%soc

If you know the charge rate you can determine how full it was mathing charge time

 

[DTBA]

Will report back