Discover Energy Systems refuses warranty on 48V Rackmount Heated Battery (Beware)

Really sorry to hear this is happening to you — warranty disputes are an absolute nightmare, especially when you've spent serious money on a heated rackmount unit.

Has anyone else on here had dealings with Discover Energy Systems specifically? I'm currently speccing out batteries for my garden office build and this is exactly the kind of thing that makes me nervous about going with lesser-known brands.

A few questions if you don't mind:

• What reason are they actually giving for refusing the claim?
• Is the fault clearly a manufacturing defect or could they argue user error?
• Did you purchase direct or through a UK distributor?

The reason I ask about the distributor route is that your statutory rights under the Consumer Rights Act 2015 sit with whoever you bought from, not necessarily the manufacturer. If you went through a UK reseller, that might be worth exploring regardless of what Discover say.

I've been looking at Fogstar and Pylontech for my setup partly because of their more established UK presence — feels like there's more recourse if something goes wrong. Victron obviously has solid UK support too, though they don't do the battery side in the same way.

Would be curious whether anyone has successfully escalated a warranty dispute like this through Trading Standards or a credit card chargeback? Seems like that could be a realistic route if the manufacturer is stonewalling.

Really hope you get this resolved — please do keep updating the thread as it progresses, this is genuinely useful information for the rest of us making purchasing decisions.

@HollyGazer had the same runaround with a different brand on my motorhome build — the magic phrase that suddenly made them cooperative was "Section 75 Consumer Credit Act" if you paid any portion on a credit card, or "Letter Before Action" if not.

Key things to document right now:

• Full photo/video evidence of the fault
• Every email thread saved as PDF
• Check if their warranty terms actually comply with the Consumer Rights Act 2015 — 6 years coverage in England & Wales regardless of what their paperwork says

Also worth posting your evidence on the Electrical Vehicle & Off-Grid forum on Facebook — manufacturers watch those like hawks and suddenly discover their customer service department.

Trading Standards is free and genuinely puts the wind up smaller importers who think heated battery warranties are somehow optional extras.

Not surprised tbh. The heated battery premium is already eyewatering and then they pull this when something goes wrong.

Worth checking the Consumer Rights Act 2015 before you do anything else — if the battery is less than 6 months old, the burden of proof is on them to show the fault wasn't inherent. A lot of these suppliers bank on customers not knowing that.

Also, did you buy on credit card? Section 75 is your friend if it was over £100.

My Fogstar units have been fine so far but I've always been sceptical about lesser-known rackmount brands making big heated-cell promises. What were the actual failure symptoms? Curious whether this looks like a BMS issue or the heating element itself — might help narrow down whether it's a design fault vs install problem.

@ExPostie yeah the heated premium stings enough without the warranty circus on top.

Worth noting — Section 75 of the Consumer Credit Act is your actual friend here if the purchase was over £100 on a credit card. Card company becomes jointly liable. Sorted a dispute for me when a supplier went quiet on a Victron component a while back.

Also check if Discover Energy have a UK distributor vs selling direct — sometimes the importer has different obligations under UK consumer law than a foreign manufacturer does.

Document everything. Every email, every photo, timestamps. If it goes to small claims it's all about paper trail.

What was the actual stated reason for refusing the warranty? That matters a lot for figuring out the angle of attack.

@OffGridMax good shout on Section 75 — that's genuinely the nuclear option that makes them take notice.

One thing worth checking before going that route: what does their warranty documentation actually say about installation requirements? Manufacturers love hiding little gotchas in there — things like "must be installed in a temperature-controlled environment" or "requires a certified electrician" — then use any deviation to void the claim.

I had a minor spat with a supplier over a Fogstar unit last year. Pulled out their PDF warranty doc, cross-referenced it with what I'd actually done in my shepherd's hut build, and came back with a point-by-point rebuttal. That alone shifted the tone of the conversation considerably.

Document everything — installation photos, BMS logs if you've got them, any temperature data. Evidence pile = bargaining power.

@BatteryWez is right that Section 75 gets attention fast — but before escalating, make sure you've documented everything in writing.

I went through something similar with a supplier (different brand, not Discover) on my motorhome build a couple of years back. The moment I sent a formal letter referencing Consumer Rights Act 2015 — specifically the "satisfactory quality" and "fit for purpose" clauses — the tone changed completely.

Key things to gather now:

• All original correspondence
• Installation photos showing correct setup
• Any temperature logs from your BMS or Victron Cerbo if you have one
• Their written refusal with specific reasons stated

The heated premium on these rackmount units is substantial, and UK consumer law doesn't care what the manufacturer's own warranty T&Cs say if the product failed to perform as described. Don't let them fob you off with vague "improper installation" claims without demanding the evidence behind that assertion.