Inverter Help

full_mosey wrote:

Lantley wrote:

full_mosey wrote:

Lantley wrote:

What you are really showing is the ability of AGM's vs. wet cell.
AGM can rebound from 11.45 without issue. I think running your typical wet cell at 11.45 may do damage?

It is not the rebound that I believe is the issue.

I don't believe your typical 220AHs of flooded 2 x GC 6Vs will hold the 11.45V like the AGM does, but will LVD instead. More weight, more footprint/space; less performance.

HTH;
John

Maybe I don't understand or maybe we are saying the same thing. Your AGM batteries started above 12 volts. They slowly discharged to 11.45.
But they will take a charge back to 12 volts without issue or damaging the batteries.
My thought is if a wet cell is discharged to 11.45 the cells will be damaged and the battery will suffer from being discharged that much.
not sure what LVD means ?

We are not saying the same thing. 11.45V under load will not damage the battery. It says little about the battery's % of charge.

LVD is Low-Volt-Disconnect/Trip. This is an inverter specification. The documentation usually states that the inverter will shut down to protect the bank. The other reason for LVD is to protect the inverter. The LVD can also give a clue as to the robustness of the inverter. A lower LVD is better.

In the 11.45V test, I was using an inverter with a 10.5V warning(beep) and a 10V shutdown. I was nowhere near LVD. Some inverters have 11.5V LVD!

Now if you combine a pair of GCs with an inverter having a higher LVD, you are going to have quicker shutdown meaning less 120VAC run times. GCs drop Volts faster and lower than AGMs as the draw increases.

Conversely, the AGM with the same inverter will give longer 120V run times because the Volts will take longer to drop to the inverter's LVD. Best is combining AGM and a robust inverter with a 10V LVD.

HTH;
John