Engine battery discharged by Orion when connected to 220V?

DIY
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1

Hi, can this problem be possible? If I install a Orion XS to charge the LiFepo4 battery from the engine AGM battery, can I have a situation like the pic? So the charger put 40A into the engine battery but the Orion pull 50A, so the engine battery will be discharging.

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2

Section 4.2 of the manual states that if the input voltage falls below the shutdown voltage that you set, then the Orion reduces the current it is passing forward to the lithium battery. So it sounds like you need to set the shutdown voltage at something like 12.8V to stop discharging the starter battery.

3

Yes, but in case the 220V charger is ON, the Orion will see more than 13V so start charging the LiFePo4 Batteries.

4

Yes I know, I was telling you how it would avoid discharging the starter batteries. It is all in the manual.

To describe it in detail.

  1. The 220ac charger will turn on
  2. This raise the voltage above whatever start up voltage you have on the Orion.
  3. The Orion will start charging the lithium battery.
  4. Because the Orion can input perhaps 55A but the 220ac charger is only providing 40A the battery will start discharging.
  5. The starter battery voltage will fall.
  6. When it reaches the shutdown voltage you set, the Orion will reduce its current to maintain the shutdown voltage to stop the starter battery discharging.

If you set the shutdown voltage at say 13.5V the 220ac charger will keep charging the starter battery by a small amount.

You can also set the Orion to have a lower charging current.

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5

and once the Lithium battery is charged, then the starter battery will go to full charge.

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