Mixing Victron Smart Lithium with third-party 15 kWh battery (parallel)

Q&A and troubleshooting
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1

Hello,

I currently have a Victron battery setup consisting of:

  • 6 × Victron Smart Lithium 25.6 V 100 Ah

  • Configuration: 2S3P

  • System voltage: ~51.2 V

  • Total capacity: ~300 Ah (~15 kWh)

System is running with an EasySolar II GX 5000VA.

I am considering adding an additional ~15 kWh LiFePO4 battery from a third-party manufacturer (non-Victron) in parallel with the existing Victron bank.

The new battery would be a 51.2 V (16S) LiFePO4 pack with its own BMS (likely JK or similar).

Questions:

  1. Is parallel operation with Victron Smart Lithium officially supported or commonly used in practice?

  2. What are the main risks regarding BMS coordination and current sharing?

  3. Any recommendations regarding wiring, protection, or pre-charge when mixing Victron and non-Victron batteries?

  4. Has anyone successfully integrated a mixed battery bank like this long-term?

  5. Any impact on DVCC / battery monitoring / VRM accuracy?

Goal: increase total capacity while keeping the existing Victron bank.

Thanks in advance for any real-world experience.

2

From voltage point of view it should work.
But you need to combine the information from two not compatible BMSes.

Search for software like “serial battery” “battery aggregator” and check if those support Victron batteries.

There is no official solution AFAIK

Sorry, I don’t have real world experience with such a setup.

2 Likes
3

I would inspect the manual, most commercial vendors will void your warranty if you add different models to the same system.