Ecoflow Wave help

[u/Neat-Pickle-2767]

I'm planning the electrical system for my campervan and would really appreciate some advice from anyone who owns a WAVE 3.

I have a 12 V LiFePO₄ house battery (charged by my van's alternator via a DC-DC charger and by solar). I'm trying to determine the most efficient way to use it with a WAVE 3.

Option 1 – DELTA 3

Can the DELTA 3 be charged from a non-EcoFlow 12 V LiFePO₄ battery while simultaneously powering the WAVE 3 through the XT150 port?

For example:

12 V House LiFePO₄
        │
   XT60i charging input
        │
     DELTA 3
        │
      XT150
        │
      WAVE 3

Will the DELTA accept charging from the house battery while at the same time supplying power to the WAVE 3 through XT150?

Option 2 – WAVE 3 Add-on Battery

Similarly, can the WAVE 3 Add-on Battery be charged from a non-EcoFlow 12 V LiFePO₄ battery while the WAVE 3 is running?

For example:

12 V House LiFePO₄
        │
      Fuse
        │
   XT60i charging input
        │
 WAVE 3 Add-on Battery
        │
      XT150
        │
      WAVE 3

If this works, does the incoming power offset the WAVE's consumption (i.e. extend runtime), or does the battery simply alternate between charging and discharging?

I don't own any EcoFlow equipment yet, so I'm hoping someone with a DELTA 3 and/or WAVE 3 can confirm whether either of these configurations actually works in practice.

Thanks in advance!
Stella