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Macca61 avatar image

SOC going to 100% immediately

Hi i have a recent install 4 x 200 a/h lithiums, 2 solar banks x 2 controllers the battery SOC gradually creeps down overnight as i would expect but in the morning as soon as the PV are lit up by the sun the SOC goes straight from say 89% to 100%, obviously this not correct , any ideas please

SOC
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Hi @Macca61 How are you reading SOC? There is not quiet enough information about your system in your description. But most issues like this are settings related.

1 Answer
Jaco Reinecke avatar image

Hi,

Jip, I had same. I assume you have a BMV?

These are the settings I used for the BMV, adjust as per your lithium banks voltages:

Settings Set:
Bulk : 54.6v
Float : 53.4v
Charge: 70amps

BMV Charge Efficiency: 99%
BMV Peukerts Exponent: 1.05
BMV Charged Voltage (0.3% below Absorption) : 56.7
BMV Tail Current: 2% (~2 to 4%)
BMV Charged Detection Time: 3 (~2 to 5 min.)

Sync voltage to be about 0.2 to 0.4 below absorption voltage.
Configure the tail current parameters so it syncs reliably.

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