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Stefan
I have bought on Alibaba twice. The first time the heat pump from NEW ENERGY, they had a functional website with valid prices, delivery of the heat pump to the yard.Excellent cooperation, the heat ...Read on

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    Photovoltaics from Rosen Solar Energy

    I have bought on Alibaba twice. The first time the heat pump from NEW ENERGY, they had a functional website with valid prices, delivery of the heat pump to the yard.Excellent cooperation, the heat pump is still working after four years of operation without any problems. Only last year 6 heat pumps were bought from my neighborhood. Cooperation still OK.
    In 2021, I bought from Rosen Solar Energy, a Cherry dealer on Alibaba : solar panels, Rosen Lithium Battery, MC4 connector and PV cable. I had problems since the beginning of the purchase. Rosen's non-functional page on Alibaba, increasing the already agreed selling price and unmanaged shipping to Slovakia.
    When installing the battery from Rosen, the technician found that the battery was not compatible with the GoodWe inverter. In all the technical documentation available and supplied to me, Rosen guarantee this.
    After consulting with GoodWe, we got it working, but the inverter still showed a communication error. The battery was functional but setting the parameters was KO. GoodWe has CAN communication. The Rosen battery after the fact has RS 485 communication. After less than two months of work, the battery stopped working. The technician, due to the problem and measurements taken, concluded the BMS was malfunctioning.
    I informed the Cherry dealer of the problem. I documented the problem with photo documentation. In two months of intensive correspondence, the resulting resolution of the problem is zero. No meaningful response. Even asking for help at info@rosensolar.com has not helped. Ignoring problem solving is about standard at Rosen.
    I have also consulted the problem with the BMS manufacturer Seplos. There I was informed that the BMS with the designation 48100-1101-10D-...... that I have installed in the battery has only RS 485 communication. But in all the documentation I received from Rosen, CAN communication is mentioned. This is also the likely problem with the reported communication error.
    According to the manufacturer Seplos, the CAN communication BMS has a 48100-1101-10C/EN/- designation. I have also written to the Cherry dealer about this information from the Seplos dealer.
    He has not responded to my request to have a new functional BMS supplied to the battery that meets the parameters guaranteed in the technical documentation, unless you count the Emoji.
    The technician who helped me select the PV assembly and installed it after delivery commented that he has never encountered such a negative, ignorant attitude.
    If you're interested in Rosen PV, beware of the Cherry dealer. It's a complete disaster.
    On 11/09/22, the seller Rosen wrote to me to send my standard-made GoodWe converter to China for testing. That's really power and incompetence. The inverter works reliably and meets the offered technical parameters. Works with CAN communication. The battery from Rosen does not meet the technical parameters offered, it does not have declared CAN communication, but only RS 485. Its BMS designation is 48100-1101-10D-, which means that it has RS 485 communication.
    The BMS with CAN communication has the designation 48100-1101-10C/EN/-.
    To make you believe this absurdity, I am also attaching a message from Rosen:
    Hello Stefan,

    First of all, we never said we can match all inverters at the same time, we need to set our battery for you in advance.
    Did you send your Goodwe inverter to us to test first?

    Best regards







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