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midi avatar image
midi asked

Not getting full capacity from BYD before cut off voltage

Hi


I purchased a 2.5 kW BYD 3U battery module and did a fully charge according the datasheet. After trying to discharge the battery while logging the battery capacity, I found after 1550 Wh/29Ah that the battery bms cut off the battery when the voltage drop below 50.2V. Is there a way to change the cut off voltage to e.g 48V as obviously with current settings, I'm not even near to utilize the 2500 Wh capacity?

BYD
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Guy Stewart (Victron Community Manager) avatar image
Guy Stewart (Victron Community Manager) answered ·

I am making a few presumptions,

Firstly that you, or your installer followed the BYD & Victron manual.

Second, that this is an ESS system, and you are using the recommended values:

https://www.victronenergy.com/live/battery_compatibility:byd_b-box#veconfigure_settings

It is possible to push the battery further by adjusting the sustain voltage setting in the ESS assistant. You will also need to adjust the alarm voltage thresholds.

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midi avatar image midi commented ·

Hi,

I haven't connected the battery to the inverter or external BMU yet.

I first want to make a capacity test of the U3A1 battery but at mentioned it cut off when the voltage drops below 50.2V.

How to lower this cut off limit?

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