Are Chinese Home Batteries Reliable? The Data Report

We asked 1,200 homeowners and audited the RMA records of 18 brands. The answer to the title’s question is yes — with one asterisk the size of a warehouse.

The prejudice is understandable. Five years ago, a Chinese home battery was a gamble on an unknown name with an untranslated app. The data from our survey says that era is over: field failure rates of the Chinese brands in our audit now sit within the same band as the European incumbents — in several cases below them. LFP chemistry, mature BMS design and brutal manufacturing scale did that. The product is no longer the risk.

The asterisk is service. When we measured what happens after a fault report — who answers, how fast, who ships the part, who pays for the truck roll — the picture split cleanly. Brands with a European parts hub and a staffed service desk answered installers within 48 hours over 90% of the time. Brands selling through pure import channels took eleven days to acknowledge a claim. The hardware gap has closed; the service gap has not, and it is the gap that decides whether a failure costs you a week or a season.

Three findings from the audit deserve to be quoted directly. First: RMA turnaround ranges from 6 days to 28, and it correlates with one variable — physical parts stock in Europe — not with brand origin, price or marketing language. Second: warranty approval rates vary from 82% to 97%, and the lowest scores belong to brands whose warranty documents leave the decision to “the manufacturer’s assessment”. Third: installer training is the strongest predictor of first-year fault rates. The best hardware installed by an untrained crew fails like bad hardware.

For buyers, the translation is simple. The question is no longer “Chinese or European?” — that question is five years old. The question is “which tier of service network stands behind this box?” A €590/kWh battery with a Rotterdam parts hub and a 7-day RMA beats a €780/kWh battery whose claim process starts with an email to a general inbox.

For manufacturers reading this — and we know you do — the implication is equally direct. The awareness battle is being won; BYD name recognition in our Belgian sample reached 71%. The trust battle is being lost in the last mile: 34% trust-to-install conversion, and every failed service story in a Facebook group costs you a neighbourhood. The money you are spending on brand campaigns would compound harder in service desks and parts hubs. That is what the next survey will measure.

One caveat we owe you: our RMA audit covers the brands we could verify through installer channels; two brands declined to participate and are marked accordingly. Scores are published as audits complete, and no brand can pay to influence them — that is the rule this platform is built on.

Method: 1,200-homeowner survey (BE/NL, Q2 2026), installer-interview RMA audit of 18 brands, warranty-document review. The full scoring grid is published on our methodology page.