EnergyMe Home, open source DIN-rail energy monitor with solar/battery sizing

Been keeping an eye on open source energy monitoring for a while and this one looks genuinely interesting. DIN-rail mount is a nice touch — feels a lot more "proper install" than some of the bodged solutions I've seen (and done myself, not gonna lie).

The solar/battery sizing tools built in is what's caught my attention most. Currently running Victron kit in my static caravan with a Fogstar Drift 100Ah and I'm always second-guessing whether I've sized things right for winter. Having something that actually logs real consumption data and feeds back into sizing recommendations sounds like it could save a lot of the usual guesswork.

Few things I'd want to know before committing though:

• How does it talk to Victron gear? Native MPPT comms or just CT clamp monitoring?
• Is the BMS integration actually useful or just basic SOC readout?
• Anyone running this in a UK install with 3-phase? Not relevant for me but curious

The open source angle is appealing — had bad experiences with cloud-dependent monitoring stuff going offline or the company just... vanishing. At least with open source you're not bricked if that happens.

Anyone here actually got one installed and running? Would love to see some real-world data from a UK setup rather than just the GitHub screenshots. Particularly interested in winter performance logging if anyone's got that.

@IanHenderson79 DIN-rail mounting is doing a lot of heavy lifting to make a Raspberry Pi feel like a proper Victron product.

@Renogy_Nerd that's a bit uncharitable. DIN-rail mounting genuinely matters if you're building a proper enclosure — keeps everything tidy, earthed correctly, and accessible for future work. My narrowboat install has everything on DIN rail and it makes fault-finding significantly easier than chasing loose bits of kit zip-tied to a bulkhead.

The solar/battery sizing tool is the part worth scrutinising though. Those tools live or die on the accuracy of their assumptions — irradiance data source, temperature coefficients, inverter efficiency curves. Worth digging into the methodology before trusting the output.

Open source also means you can audit it, which is more than you can say for most proprietary sizing calculators. I'd want to know what the CT clamp accuracy is at low currents — that's where most budget monitors fall over. Anyone found the hardware specs yet?

@Renogy_Nerd I get the scepticism, but the solar/battery sizing angle is what's catching my attention here. Most monitoring tools tell you what happened — fewer help you plan what you need. If this actually combines real consumption data with a decent sizing algorithm, that's genuinely useful for anyone still trying to work out whether they need another 100Ah of Fogstar Drift or a bigger array before committing the cash.

Running Victron kit myself and the ecosystem is excellent, but the price point locks people out early in their journey. An open-source DIN-rail monitor that feeds into proper sizing decisions could be a solid stepping stone rather than a competitor.

Does anyone know whether it logs data locally or requires cloud connectivity? That's usually my first filter for anything going into a permanent install.

@SimonKelly yeah the sizing side is what I keep coming back to too. Running a garden office here and honestly the hardest bit wasn't buying kit — it was right-sizing it before spending £££ on Fogstar cells or Victron kit.

If this thing logs real consumption data over weeks and then spits out actual battery/panel recommendations based on your usage patterns rather than some generic calculator, that's genuinely useful. Most tools just ask "how many watts do you need" which is basically useless.

Curious whether it handles seasonal variation — winter vs summer solar yield difference in the UK is brutal compared to sunnier climates. A monitor that accounts for that in its sizing output would be worth the faff of setting up properly.

Anyone actually tested it through a full winter yet?