Shockingly poor data feed
I can't speak to the quality of the kit, not being a technical expert, but the data interface at server.growatt.com is shockingly poor in terms of available data, download options, and server response times. The Android ShinePhone app is almost useless - a major battery drain and for some reason disrupts NFC and stops GooglePay working properly. It would cost almost nothing to sort this out and the fact it's so poor reflects badly on the company's commitment to engineering excellence.