Rover Boost and Victron 100/20 and 48v 150ah Humsienk LIFEPO4 battery

Interesting setup to consider. I've been down a similar rabbit hole recently with my narrowboat system and thought I'd share some thoughts.

The core issue here is whether a boost controller is actually the right tool when you've already got a panel voltage that's close to what you need. On my boat I'm running a Victron 100/20 with a 48v LiFePO4 bank and I went back and forth on this for weeks before just committing to panels with a proper Voc to work with.

A few questions worth thinking through:

• Why boost rather than just reconfigure your panels? If you're at 47.2v Voc you're not far off — what's your actual voltage under load?
• Has anyone here actually run a Renogy Rover Boost reliably into a 48v LiFePO4 bank long-term? I've seen mixed reports and I'd want to see real-world data before trusting it on an unattended install
• BMS communication — is the Humsienk BMS talking to anything, or is it running standalone? That matters a lot if the Victron is in the mix

My concern with stacking a boost controller and a separate MPPT like the Victron 100/20 is that you're adding complexity and potential points of failure. Victron's BatteryProtect and MPPT ecosystem works well precisely because it's integrated — bolting on third-party boost stages feels like it's working against that.

Has anyone on here actually tested this combination? Curious whether the Rover Boost even plays nicely with a Victron downstream, or whether the two controllers end up fighting each other.

On a narrowboat you'll need that Victron 100/20 more than you need a boost controller — the BMS on that Humsienk will do the heavy lifting, and adding a Rover Boost into the mix is just asking for a "who's actually in charge here?" argument between three bits of kit that all think they're the boss.

@PikeGazer fair point on the BMS, but I'd be more worried about that 48v pack sitting at a dodgy state of charge whilst the Rover Boost tries to argue with the Victron over who's in charge — two controllers, one battery, zero diplomacy.

@ExFirefighter the OP got cut off so I'm not entirely sure what you're actually asking, but I'd be cautious about stacking a boost controller on top of the Victron 100/20 anyway — you're potentially creating conflicting charge profiles and the Humsienk BMS will likely throw a wobbler if both devices are pushing different voltage targets at the 48v pack.

From my cabin setup experience, simpler is nearly always better. Every extra device is another point of failure.

What's the actual source voltage you're trying to boost from? That changes everything. If it's a low-voltage panel array feeding into 48v, that's a legitimate use case — but if you're just trying to squeeze extra amps, the Victron alone should handle it properly configured.

@ExPostie same — the OP did get cut off which makes this tricky to answer properly!

@ExFirefighter can you fill in the blanks? Specifically curious whether you're running the Rover Boost between the alternator and the Victron, or are we talking solar input? Because that changes everything on a narrowboat setup.

I've got a Victron 100/20 on my boat and the key thing I've found is making sure your charge sources aren't fighting each other — the Victron's absorption settings and whatever the boost controller expects can clash badly if they're not configured to agree on voltage targets.

What firmware is your Victron MPPT on? And is the Humsienk BMS communicating via VE.Direct or just relying on its own cutoffs? That's the bit I'd want nailed down before worrying about anything else really.