Practically non-existent technical support
I ordered a set of Dyness DL5.0C Pro batteries back in March to provide storage on my solar installation, and they have performed really well, so much so that we have gone off-grid. I ordered a second batch of batteries from the distributor to increase the battery capacity for winter, but these turned out to be DL5.0C, not DL5.0C Pro. The distriubutor assured me that they were fully compatible, but other professionals said they were not, and that they should not be combined. I contacted Dyness support for clarification by email, and over the last two weeks I have sent over fifteen emails to seven different addresses provided on their documentation. I have not even had automated responses. On their website they say that they will respond to technical support requests within 24 hours. After almost two weeks, only two of the emails have been answered and they have not provided a definitive answer about the compatibility of the two models of battery.
I like the product, which performs really well, but their technical and after sales support is practically non-existent. The English support website has only an overseas telephone number - not a UK one.