Anyone else running a cheap Chinese MPPT alongside a decent inverter — how are you getting on?

Picked up an EPever Tracer 4210AN off eBay for about £45 delivered a few months back and honestly I wasn't expecting much, but it's been solid so far. Running it with two 200W panels I rescued from a local solar farm clearance, feeding into a pair of 100Ah leisure batteries. Total spend so far is under £180 for the whole charging side of things.

The bit I'm less sure about is how well it's actually talking to my Victron Phoenix 350VA inverter. The EPever has its own MT50 display and the numbers look reasonable — I'm seeing around 280–310W coming in on a decent day — but I've got no way of knowing if the two bits of kit are playing nicely together or just doing their own thing independently. No shared monitoring, obviously.

Has anyone wired up a Victron and a budget MPPT and noticed any odd behaviour? Things like the inverter pulling the battery down faster than the MPPT can respond, or the charge profile not quite matching what your batteries actually want? My batteries are pretty bog-standard calcium leisure cells so I'm not being precious about it, but I'd rather not quietly cook them over winter.

Also curious whether anyone's bothered wiring the EPever into a Raspberry Pi or something for basic logging — seen a few threads about RS485 adaptors but not sure if it's worth the faff on a budget setup like this.

@KenCrane interesting — I've been eyeing up the EPever range myself. Quick question: are you running it directly into a Victron inverter or just straight to batteries?

I've got a Renogy Wanderer at the moment which does the job but I'm seeing some weird behaviour where it seems to throttle back on partially cloudy days even when there's still decent irradiance. Wondering if it's a firmware thing or just the cheap MPPT algorithm not tracking properly.

Did you have any issues getting the PC software to connect? I've seen mixed reports about the MT50 remote meter being a bit flaky on some units.

Also — what's your battery bank? Running AGM or lithium? I'm considering jumping to Fogstar Drift cells next year and want to know if the EPever handles LiFePO4 profiles properly before I commit.

@KenCrane funny you should mention the EPever — I ran one of those Tracer units in my shepherd's hut build for nearly a season before upgrading. Paired it with a secondhand Victron MultiPlus and honestly the two played together surprisingly well, no funny business on the comms side.

The weak point I found was the temperature compensation — the EPever's sensor lead is a bit agricultural compared to what Victron does natively. Worth checking your charge curves aren't cooking your batteries on a warm afternoon, especially if you're running lithium rather than lead-acid.

One tip: grab the MT50 remote display if you haven't already. About £15 on Amazon and suddenly you've actually got visibility into what the controller's doing rather than squinting at two LEDs.

@KenCrane ran an EPever Tracer 3210AN for about eight months in my cabin before swapping it out — not because it failed, mind you, but because I wanted proper integration with my Victron kit. The EPever did its job quietly and without complaint, which is honestly more than I expected at that price point.

The thing nobody warns you about is the MT50 remote display — worth every penny of the extra tenner. Without it you're flying blind on your charge history.

Where I did notice a difference was moving to a Victron SmartSolar. The Bluetooth logging and proper absorption curves made a measurable difference to my Fogstar cells over winter. But if budget's tight? The EPever will absolutely get you there.

Been running a cheap Renogy Wanderer alongside my Victron MultiPlus in the van for about a year now — different price bracket to your EPever but same principle. The key thing I found is keeping the charge profiles consistent between the MPPT and whatever your inverter/charger is doing, otherwise they end up fighting each other over the battery state. Took me an embarrassing amount of time to realise my Fogstar Drift LiFePO4 cells weren't hitting full capacity because the two devices had conflicting absorption voltages set. Once I matched everything up properly, sorted.

@MountainBarry curious what you swapped to — Victron SmartSolar? The Bluetooth monitoring alone is worth the price jump IMO, especially if you're not always on site.