question

jimbo avatar image

Pylontech VEconfig Inverter Tab Settings conflict.

The Victron Pylontech install documentation recommends:


5.3 Inverter Settings

In the Inverter tab of VEConfigure

VEConfigure Inverter Parameter Setting

DC input low shut-down 44V

DC input low restart 48V

DC input low pre-alarm* 48V


However:


PylonTech recommended

DC input low shut-down 42V

DC input low restart 45V

DC input low pre-alarm 45V


which is correct/best to use?


thanks


J



Multiplus-IIPylontech
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2 Answers
Guy Stewart (Victron Community Manager) avatar image
Guy Stewart (Victron Community Manager) answered ·

Hi @jimbo,

It doesn't really matter. Ultimately the battery will take care of itself.

The Victron settings are more conservative, so you will sacrifice some battery capacity for a more reliable system.

It is always Victron's preference that the inverter shuts itself down BEFORE the battery enters some internal error low voltage protection shutdown state, that might require some manual intervention.

Pushing the shutdown and restart voltages too low can lead to the system cycling too quickly (3 times repeatedly), and then not automatically restarting (requiring a manual intervention to start up again).

None of these settings will damage either the battery or our equipment, so you are free to modify them to suit your particular circumstances, and find the best balance of reliability and usable battery capacity.

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Rob Duthie avatar image
Rob Duthie answered ·

My setting i use with out any issues.

TAB: Assistant Configuration

ESS (Energy Storage System) (size:945)

*) System uses LiFePo4 with other type BMS

(This can be either a BMS connected via CAN bus or a BMS system in which the

batteries are protected from high/low cell voltages by external equipment.)

*) The battery capacity of the system is 200 Ah.

*) Sustain voltage 48.00 V.

*) Cut off voltage for a discharge current of:

0.005 C= 46.00 V

0.25 C= 46.00 V

0.7 C= 46.00 V

2 C= 46.00 V

*) Inverting is allowed again when voltage rises 1.20 V above cut-off(0).

*) Relevant VEConfigure settings:

- Battery capacity 300 Ah.

- PowerAssist unchecked

- Lithium batteries checked

- Dynamic current limiter unchecked

- Storage mode unchecked

TAB: Charger

Enable charger checked

Weak AC input unchecked

Stop after excessive bulk unchecked

Lithium batteries checked

Use equalization (tubular plate traction battery curve) unchecked

Charge curve Fixed

Absorption voltage 52.00 V

Float voltage 51.00 V

Charge current 35 A

Repeated absorption time 1.00 Hr

Repeated absorption interval 7.00 Days

Absorption time 1

TAB: Inverter

PowerAssist unchecked

Inverter output voltage 230 V

Inverter DC shut-down voltage 44.00 V

Inverter DC restart voltage 48.00 V

Low DC alarm level 48.00 V

Do not restart after short-circuit (VDE 2510-2 safety) unchecked

enable AES unchecked

Regards

Rob D

NZ

2 comments
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Thanks Rob. I'd like someone from Victron to clarify the disparity.

It's explained in the document you quoted from.


Basically you don't want to drop under 3V (LiFePO4 cell voltage), so I would set the "DC input low shut-down" limit even higher, at 45V.