Smart home tech that works off-grid

Been running a Victron system in my shepherd's hut for two years now and honestly, the "smart" stuff is where I've learned most of my expensive lessons.

Got seduced by Home Assistant initially—lovely idea, total nightmare on a 5kW system when you're rationing electrons like they're going out of fashion. Now I'm all about dumb devices with optional smart overlays rather than the other way round.

What actually works for me:

Victron's own monitoring (GX device + app) is genuinely solid—no surprises, just tells you what's happening with your batteries and solar. Fogstar charge controllers are bulletproof if you can live without Bluetooth. Renogy stuff is decent value but honestly, I've stopped obsessing over real-time data and started obsessing over not needing real-time data (bigger battery = fewer panics).

The real game-changer was accepting that off-grid smart tech means redundancy you can actually afford. My cabin has zero internet most days. That fancy WiFi thermostat? Useless. A mechanical timer and good insulation? Legendary.

My actual question back: Are you lot trying to make off-grid easier or just adding complexity for the sake of it? Because I reckon 80% of us would be happier with reliable basics and proper battery sizing than with 47 sensors reporting every 30 seconds.

What's your setup looking like, and are you trying to automate actual problems or just because it's available?

Home Assistant is brilliant until you realise it's just another thing draining your battery at 3am because some integration decided to phone home, yeah?

I went the other way on the narrowboat—kept it dead simple with a basic Victron BMV display and honestly never looked back. The irony is watching folk with gigabytes of smart monitoring data whilst I'm just... actually generating enough surplus to feel smug about it.

If you must have smart stuff, Victron's native stuff plays nicer with limited bandwidth than bolting on HA IMO. Keeps the goblin gremlins at bay.

What were your specific expensive lessons? Might save someone else a solar panel's worth of frustration.

Has anyone here actually got a reliable setup without constantly babysitting it? I've been eyeing Home Assistant but the parasitic load concerns are putting me off—especially overnight when my battery's already stressed.

What's your actual power consumption looking like @ThistleKen? Are you talking watts or just noticeable drain?

I'm running a modest Victron setup with lithium, so I've got a bit more headroom than some, but I'm genuinely curious whether the convenience is worth it. Been thinking a basic Shelly relay for monitoring might be the smarter move rather than getting pulled into the full smart home rabbit hole.

@Renogy_Nerd what did those expensive lessons teach you? Specifically around battery parasitic loads?

Mate, I've got Home Assistant running on a solar-powered cabin setup and honestly it's a mixed bag. The trick is being ruthless about what you actually automate. I ditched about 60% of my integrations because they were just parasites on the battery.

What actually works for me: basic water tank monitoring, fridge temp alerts, and solar production stats. That's it. Everything else was noise.

The power draw isn't massive if you're sensible—my Fogstar setup handles it fine during daylight—but @ThistleKen's right about integrations going rogue. I had a Zigbee integration that kept polling devices every 30 seconds at night. Nightmare.

For the boat especially, I'd skip Home Assistant entirely. Too fragile for movement. Stick with a simple Victron display and physical monitoring. Your brain's still the best smart home.

Yeah, this is where off-grid reality bites. I've got Home Assistant on my narrowboat and the real issue is you need proper power budgeting before you even install it.

The difference between mine working and not was honestly boring stuff—disabling cloud integrations, setting aggressive sleep modes, ruthless about which automations actually matter. My mistake was thinking "smart" meant every sensor talking to everything else constantly.

@ThistleKen's right about the 3am drain. Mine was doing exactly that until I realised I had like 12 automations running unnecessary checks.

The sweet spot I've found: use HA for critical stuff only (battery monitoring, solar divert), run other things on cheap simple timers. Sounds daft but my system's been rock solid since I accepted it doesn't need to be fully "smart."

What's your power budget looking like, @Cleggy? That's usually the starting point.

Been wrestling with this myself in my static caravan setup. The thing nobody mentions is that Home Assistant needs a fairly stable power supply to not corrupt its database—learnt that the hard way after a battery dip knocked out my entire config.

What's actually worked for me is keeping the "smart" bits minimal. I've got Victron monitoring via their own app and a single Shelly relay for the water pump, nothing fancy. The rest is just good manual habit—checking my battery state every morning with the actual display, not relying on notifications that might not push if the connection drops.

@Cleggy if you're after "set and forget", honestly you might be better off with basic load controllers and manual oversight. The smart stuff is great when your grid is stable, but off-grid means accepting things will be less automated.

That said, if you're determined to do HA, make sure your system has genuinely reliable power first—oversized battery bank, decent voltage regulation. Treat the smart home as a luxury layer on top of solid fundamentals, not the foundation itself.

The problem with Home Assistant off-grid is it's designed by people who've never watched their battery percentage drop because some service decided to phone home at 3am. Learnt that one the hard way on my narrowboat when the whole thing started hammering the connection trying to update integrations I'd forgotten I'd enabled.

What nobody tells you: it's brilliant *until it isn

@Renogy_Nerd, @DODQueen's hit on something crucial there. I'd add that the real problem isn't Home Assistant itself—it's the ecosystem it encourages you to build around it.

Every sensor, every automation, every integration you add is another thing consuming power 24/7. A single Zigbee coordinator left broadcasting when you're in winter is genuinely costing you kWh you might not have.

What I've found works better off-grid is being ruthless about local logic. Skip the cloud integrations entirely. A simple Node-RED flow running on something like a Pi Zero W will handle your essential automations without the overhead of HA's full stack trying to maintain perfect state constantly.

Or honestly? Sometimes a Shelly relay and a MPPT controller's built-in scheduling does the job without touching software at all. Dead simple, near-zero parasitic draw.

The mentality shift that helped me: ask "what am I actually gaining here?" before adding complexity. Off-grid makes you architect differently than grid-tied living.

What's your parasitic draw sitting at currently?

The real issue is power accounting. Home Assistant itself is fine—it's the ecosystem round it that's the killer. Every sensor, every zigbee hub, every little WiFi dongle drawing 2-3W 24/7 adds up fast when you're running off batteries.

I've got a garden office on a modest Victron setup and learned this the hard way. Went through three different smart home attempts before settling on something minimal: basic monitoring through Victron's own interface plus one well-placed Shelly device for the essentials. That's it.

@PanelSteve's right—the designers haven't lived with the consequences of their architecture. Most smart home stuff assumes grid power is infinite and you're just optimising for convenience. Off-grid it's the opposite: you're optimising for survival.

If you genuinely need remote monitoring, use Victron's cloud portal. If you want local automation, keep it ruthlessly simple. A single relay and a timer does more honest work than a hundred smart rules that never run because the hub crashed at 3am.

The shepherd's hut crowd here knows this. We've all got

I've got a slightly different angle on this. Had Home Assistant running in my van conversion for about eighteen months before I ripped it out—not because it's bad software, but because I was using it wrong.

The thing is, when you're grid-tied, you don't really feel your consumption. Off-grid, you do. I was obsessing over automating everything—smart lights, smart plugs, motion sensors—and the irony was I was burning more battery just running the coordinator than I'd save through automation.

What actually works for me now is brutal simplicity. Manual Victron monitoring via their app, a couple of dumb relays for critical stuff (fridge, water pump), and honestly? A notebook where I jot down what's drawing power. Sounds stone age but I know exactly what's happening.

@PanelSteve's bang on about the design philosophy gap. Home Assistant assumes abundant electricity. @LesPhillips is right too—it's the ecosystem that kills you, not the core software.

If you've genuinely got spare battery capacity and want to tinker, fair play. But most of us don't, so

Yeah, I'd say skip the hub entirely if you're tight on power. Been there with my cabin setup—ended up ripping out a Raspberry Pi that was pulling constant watts just to log data I barely looked at.

The trick is being brutally honest about what you actually need to monitor versus what's just nice-to-have. I run a basic shunt and that's it—tells me what I need to know. Victron's own interface does the job without the overhead.

If you're already running Victron, their remote console is genuinely decent. Not flashy, but it'll give you the essentials without turning your battery bank into a subsidy for cloud services.

The smart home stuff works off-grid when it's truly local and genuinely useful. Most of it isn't either. Focus on getting your basics rock solid first—battery, generation, loads. Then add gadgets only if they solve actual problems, not just because they exist.

The power draw issue is real, but I'd push back slightly on ditching the hub altogether. I'm running HA on a Lenovo M90 Tiny here—draws maybe 15W under load, which is negligible against my 10kWh battery bank. The problem @LesPhillips and @LesCrane hit was likely running it on a Raspberry Pi, which becomes a false economy when you're constantly fiddling with corrupted SD cards.

Where I've learned the hard way: automation complexity. Started with 30+ automations thinking I'd optimise everything. In reality, most of them just added phantom loads I wasn't tracking properly. My EV charger integration kept triggering at odd times because I hadn't accounted for how my Victron's DC output fluctuates mid-morning.

Now I run about eight automations—basically solar divert for the car, battery low warnings, and temperature monitoring. Everything else is manual or simple triggers.

If you're genuinely space and power constrained, a local-only setup (no cloud, no fancy dashboards) paired with something like Node-RED might hit the sweet spot. But

Right, so I've got Home Assistant running in my motorhome and it's basically become my most expensive hobby after the batteries themselves. The irony? I spent £300 on a nice Intel NUC to run it "efficiently" only to realise my 5kWh LiFePO4 bank was basically powering a gaming PC that just... tells me when

I've gone a different route entirely with my narrowboat setup, and it's saved me grief. Instead of Home Assistant, I'm running Victron's own monitoring through their app—it's deliberately lightweight and actually designed for off-grid constraints rather than trying to do everything.

The thing is, @LesCrane's got a point about power draw, but @Mark1978's also right that it depends on your battery capacity. I spent ages tweaking a Pi-based solution before realising I was burning through kilowatt-hours just to know when my inverter was getting warm. Madness.

What actually works for me: Victron's native app for the essential stuff, a simple Shelly relay for garden lights, and honestly? A notebook for anything else. Sounds daft, but my system is now more reliable than when I was chasing the perfect dashboard.

The motorhome life means I move around constantly, so I needed something that doesn't depend on local networks anyway. If you're stationary, Home Assistant on a proper box like @Mark1978's doing might be worth it—just don't underestimate the actual draw once it's settled in.

Yeah, the power draw rabbit hole is real. I ditched HA on my caravan setup after realising it was pulling nearly 15W constantly—mental when you're trying to stretch battery reserves.

What actually works for me is just the Victron GX and their app. Sounds basic, but it's genuinely enough—monitoring, alerts, remote relay control. No separate hub burning juice 24/7. The Victron stuff plays nicely with their ecosystem anyway.

@Mark1978 fair point about the M90, but that's still kit running constantly. On a caravan or motorhome, every watt counts unless you've got surplus solar.

The mistake I made was conflating "clever" with "useful." Automating things off-grid is different than a house with mains backup. You need to be thinking about power budgets first, features second.

If you really want monitoring beyond Victron's app, just use your phone when you're actually there. Saves overthinking it.