question

Thank you for your help.

I mean the following:

1) The SOC meter remains below 80 percent despite there being much power available (and not used). I cannot get the SOC higher. SOC percentage has been tweaked to find an average. Still, I do not believe these new batteries are fully charged - the consumed Ah meter is never fully reversed to even close to what has been consumed.

2) Yes, the battery voltage is raised to 14.2 (Float level) by lunchtime and one would assume they are fully charged at that Voltage, but the Amps consumed during the night hours are never replaced (or reversed) sufficiently, because the MPPT switches to Float when it reaches 14.2V and supplies related current to maintain Float level.

3) When "forced to Bulk' by disabling charger and allowing Voltage to drop below 14.2, the charger obviously switches to Bulk and provides higher amperage. But of course for just a short period. The Ah consumed meter remains un-reversed and the SOC unchanged. My assumption for the installation of an SOC meter is to monitor the Amps consumed (and returned) as the Voltmeter alone, does not reflect true SOC.

Hence my statement to keep the Voltage supplied lower and the Amps higher.

If that is not possible.

My question is:

1) If the Float voltage on the LifePo4's I have is 14.2V, what would you set the Absorption voltage to, to increase the SOC. Would this help? As have monitored "Absorption" by setting to 14.0V but do not see the Ah consumed meter reversing. Please bare in mind - the period of maximum charge (13h00 to 16h00) is not being utilised because the charger is switching to either Float or Absorption phase as the Voltage reaches 14.0 (Absorption) or 14.2V (Float).

I do understand LifePo4 does not require recharging to 100 percent but would like to see higher SOC for when on passage, as the load during the night hours increases and would like full capacity available.

Currently drawing 300Ah in a 24 hour cycle.

Set to increase battery capacity to 900Ah (by adding another 300Ah) in three months time.

Have 1200W solar with two MPPT chargers. One being a 40Amp WRND, the other the 75/50 Bluesolar

Thanks for assisting

Normally errors in SOC are nailed down to 3 things.

Incorrect shunt wiring > loads and chargers must not bypass the shunt, the battery side of the shunt goes directly to the battery.

Badly programmed BMV's that wont synchronize reliably. Youtube tutorial.

Undersized arrays or excessive loads on the system.

You can tell just by looking at your mppt's history if the battery has been fully charged. Eg....

You have watched the Youtube tutorial??

Your history screenshot shows that the mppt has reached float stage for the last 8 days, but only has an absorption stage on 2 days.

Voltages for absorp-float/absorp duration for the MPPT?

Post your BMV settings....

I have adjusted the absorption and float voltages to suit the Bulk phase - as I say to take advantage of available PV power during the day.

I would be more comfortable knowing your mppt settings.

The mppt will supply the loads during absorp and float phase, while holding/increasing the battery SOC, as long as there is enough sun to hold the battery voltage steady.

Scooby has set his battery float at 13.3v, and that maintains SOC at 90-95% until the sun goes down.

I have set my float voltage at 13.4v, and that maintains 98-99% SOC until the sun goes down.