Like New! Tesla 7.6kW Solar Inverter w/ Site Controller – 1538000-45-D for sale!

Interesting listing — not something you see every day on here, that's for sure.

Tesla's solar kit is still a bit of an enigma to me. From what I understand, these were designed specifically for their Powerwall/Solar Roof ecosystem, which raises the obvious question of how well it plays with anything outside that walled garden. The site controller integration is the bit that has me curious — does it talk nicely with third-party battery banks, or are you locked into Tesla's own hardware for it to actually function properly?

For my static caravan setup I've gone down the Victron route and I'm very happy with it, partly because the ecosystem is so open and well-documented. Community support is everything when something goes wrong at 11pm and you're trying to read error codes by torchlight.

That said, 7.6kW is a serious chunk of capacity, and if somebody's running a larger property or a small holiday let site, this could be a genuinely compelling bit of kit — especially if the price reflects the uncertainty around compatibility.

A few things I'd want to know before parting with any money:

• Is the firmware still receiving updates, or has Tesla effectively abandoned this product line?
• What's the warranty situation second-hand?
• Does it require a Tesla account/app to configure and monitor?

If anyone on here has actually run one of these outside a Tesla ecosystem setup, I'd genuinely love to hear how you got on. Feels like the kind of thing where the real-world experience is very different from the spec sheet.

@MoreTeaVicar — worth being cautious here. These Tesla solar inverters were designed exclusively for their Powerwall/Powerpack ecosystem and the proprietary site controller is deeply integrated with Tesla's cloud infrastructure. Without active Tesla service agreements and their backend systems, the controller is essentially a paperweight.

The 1538000-45-D designation suggests this is commercial/utility-scale kit, not something you'd drop into a static caravan or narrowboat setup. Victron, SMA, or Fronius gear at equivalent power ratings would give you actual documentation, local support, and a fighting chance at third-party integration.

Unless the buyer has specific Tesla infrastructure already in place, or is a very experienced hacker willing to reverse-engineer proprietary CAN bus comms, I'd walk away regardless of the price. "Like new" commercial Tesla inverters appearing secondhand usually means a site decommission where the ecosystem is gone entirely.

@DevonDweller makes a fair point, and it reminds me of a rabbit hole I went down when speccing out the electrical system for my van build last year.

The Tesla ecosystem is notoriously closed — proprietary comms protocols, firmware that phones home, and if Tesla decides to deprecate support for older hardware, you're potentially left with a very expensive paperweight. I nearly went down a similar path chasing "exciting" kit before settling on Victron gear precisely because the community support and open documentation is second to none.

For anyone eyeing this listing, the key question I'd be asking is: can it operate meaningfully without the Tesla site controller in a standalone setup? My gut says no. These units were architected around their own closed-loop ecosystem, not general off-grid use. Buyer beware, especially at whatever price tag is attached.

@VitoBuild the rabbit hole you're describing is exactly why I'd steer well clear. Part number 1538000-45-D confirms this is a Powerwall 2 gateway-dependent unit — it's not a standalone inverter, full stop.

Even if someone reverse-engineered the CAN bus comms (and people have tried), you're looking at firmware that actively checks for Tesla's proprietary ecosystem handshake. Without it, the thing bricks itself.

My shepherd's hut runs a Victron MultiPlus-II specifically because the open protocol support means I'm not beholden to any manufacturer's whims. Modbus, VE.Can, proper documentation — that's what you want when you're genuinely off-grid and there's no engineer coming to rescue you.

Unless the seller can demonstrate it operating independently — not just "like new in box" — this is an expensive paperweight for anyone outside a Tesla-certified installation. Caveat emptor doesn't even begin to cover it.

@SolarJunkie is right about the part number being a red flag, but I'd add one more practical concern nobody's mentioned yet: firmware lock-in. Tesla's solar inverters rely on their proprietary Gateway/Site Controller ecosystem for grid-tie compliance and safety functions. Without active Tesla cloud connectivity and a registered Powerwall installation, these units almost certainly won't operate as intended — and there's no third-party diagnostic tooling comparable to what we have for Victron kit via VE.Configure or even basic Modbus access on SolarEdge units.

I've spent considerable time integrating less obscure systems than this and even those threw up licensing headaches. Unless the seller can demonstrate it operating independently of any Tesla account, I'd treat this as salvage value at best — interesting for the curious, but completely impractical for a functioning off-grid build.

@Ozzy go on then, what's the practical concern? Don't leave us hanging 😄

Genuine question though — even if someone cracked the compatibility issue, where would you even get support for this thing in the UK? Tesla's residential energy division is basically non-existent here compared to the US. You're on your own the moment something goes wrong.

Had a mate try to repurpose some ex-commercial solar kit for his smallholding. Spent months chasing firmware docs that never materialised. At least with something like a Victron Multiplus you've got a massive community, UK distributors, and documentation that actually makes sense.

For a shepherd's hut or garden office setup this would be massive overkill anyway — and that's before you get into the proprietary headaches.