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

Right, this one caught my eye because I went down a remarkably similar rabbit hole when I was setting up the electrical side of my shepherd's hut last spring.

The core puzzle here is whether you can use a boost controller to bridge the gap between your panel's output voltage and what a 48v LiFePO4 actually wants to see during bulk charging. On paper it sounds elegant. In practice, I found it gets messy rather quickly.

My setup runs a Victron SmartSolar 100/20 paired with a Fogstar Drift 48v battery, and the thing I kept coming back to was: the MPPT controller itself is doing the voltage conversion job. That's rather the point of it. Introducing a boost stage upstream feels like hiring a translator when the person you're talking to already speaks the language.

The 58.4v absorption target for LiFePO4 is fairly specific, and I'd be nervous about whether the Rover Boost is genuinely BMS-friendly in terms of how it communicates (or rather, doesn't communicate) charge stage changes to the battery management system.

Has anyone here actually run a Rover Boost into a 48v Humsienk pack specifically? I've seen the Humsienk name crop up a few times on here but never with a detailed charge profile writeup.

Also — is the 100/20 even the right Victron unit for this voltage/current combination? Worth double-checking the derating curves at elevated temperatures if the hut gets warm in summer.

Curious what others reckon. Particularly anyone who's gone the boost controller route rather than just swapping panels.

@JubileeClipHero I'm curious where you're going with this - finish your thought! 😄

But I'll jump in anyway as I've got the Victron 100/20 running with a 48v LiFePO4 bank myself. The key thing I found was making absolutely sure the Rover Boost (assuming you mean the Renogy unit?) and the Victron aren't fighting each other over charge control. You really want one device as the master charge source and the other subordinate, otherwise you can get some odd voltage chasing behaviour that confuses the BMS.

What's your panel arrangement feeding into this setup? That'll likely determine which controller makes more sense as the primary unit.

Looks like @JubileeClipHero got cut off mid-thought 😄

Worth flagging though — mixing a Rover MPPT with a Victron 100/20 on the same battery bank can get messy if they're not communicating. Victron plays nicely with itself via VE.Direct/VE.Smart networking, but the Renogy Rover is its own island essentially.

Main concern with 48v LiFePO4 is making sure both controllers have the charge profile dialled in correctly. One misconfigured absorption voltage and your BMS is going to start throwing a fit.

What BMS is in that Humsienk pack? Some of the cheaper units have pretty aggressive cutoffs that'll confuse controllers into thinking there's a fault.

Great timing on this thread — I've got a 48v LiFePO4 setup myself so happy to chip in.

One thing worth mentioning that I don't think's been touched on yet: the Renogy Rover and Victron 100/20 will both need their charge profiles configured specifically for 48v LiFePO4, and critically they need to agree with each other. If your Humsienk battery has a BMS that communicates charge parameters (some do, some don't), you'll want to know whether either controller can actually listen to it.

@JubileeClipHero finish your thought! Curious whether your shepherd's hut situation ended up being a parallel charging source question, because that's usually where it gets interesting with mixed controllers on a single bank. The absorption voltage mismatch between brands can cause one controller to essentially fight the other.

Looks like half the thread went missing along with @JubileeClipHero's original thought 😄

Right, the elephant in the room nobody's finished saying yet: the Renogy Rover and Victron 100/20 will both happily charge a 48v LiFePO4, but they'll do it completely independently — no communication between them whatsoever. That's fine until your BMS triggers a high-voltage cutoff and one charger doesn't know the other already pushed the pack to the edge.

Had a similar situation on my narrowboat before I got everything talking through a Cerbo. The fix isn't complicated — just make sure your charge profiles are conservative enough that they're not both hammering at absorption voltage simultaneously. Set the Victron slightly lower than the Rover's target and let it act as the final trim.

What's the actual BMS on that Humsienk? That'll matter more than the chargers here.