GoodweYES

Hi , For the interested ,Photos of the interior cell of the failed Dyness battery. For the technical savvy out there this question. Is it probable that if over-voltage occurred not more the one cell would have failed ? The temperature the inverter reporter from the BMS where 30.2 .My suspiscion is that the fifth cell being in the middle were of inferior quality and the additional bit of heat it would experience being in the centre caused it to fail, Not over-voltage as alleged. BMS report were not able to be extracted by CNBMSOLAR. Strange that Dyness still says overvoltage.

Hi, Just a warning see my alert/experience dealing with Dyness guarantee https://powerforum.co.za/topic/18042-dyness-10year-warranty-anyone-else-had-a-legitimate-warranty-rejected/#comment-159143

Thanks for the advice I will ask the installer Reviron to obtain the BMS Data for me.

The installer used the Dyness-LV*4. This has a more conservative amp charge and discharge for the 4 x 50AH battery while the ones installed were 4 x 75AH . The voltage max and min are the same that is why they have a Dyness-LV*1 - 4 for both the 2.4kWh and 3.5 kWh. The inverter indicates that the max voltage that it had ever supplied were 53.69. The inverter max charge voltage setting was 53.5. (Dyness B3 has a max of 54v and min of 42V)

Hi, I had a Dyness B3 4X battery stack installed by a supplier on 3 August 2020 . At that time the installer informed me that I had a 10 year warranty on the Dyness batteries. The settings of the Goodwe 5048 inverter was set on 50% DOD on grid and 80% of grid. One of the batteries failed and I requested my installer to assist. He informed me That CNBMSOLAR the Dyness service company refused as they said the battery was given over-voltage. Now I do not understand the logic as there were 4 Dyness B3 batteries in the stack with this being the second one in the stack and wired as Dyness prescribed by the installer. All the batteries have their own BMS and as well only one battery were set as the primary which was the top one. Could you please advise me if I am correct in assuming that Dyness is shirking their responsibility as: 1) What is their basis or ground to say there were over-voltage and should the batteries Dyness BMS not protect it? I understand the swollen cells indicates overvoltage but their BMS and circuitry is to blame and should protect the cell ? 2) If the BMS failed is this not still/also the battery manufacturer issue? 3) How come all the other batteries in the stack are fine? Did their BMS work correctly and this batteries not? Is it still the manufacturer's issue? . 4) Anyone that has followed a legal resolution and what were the costs of this? 5) Do I have any recourse ie asking Goodwe why their inverter supplied overvoltage or will this just start a ping pong game in China with not respnsibility taken by anyone? 6) Any other recourse? I would appreciate any advice as it would seem the battery manufacturer intends to not wanting to honor their warranty when there is cells that are swollen regardless if the failure is caused by the BMS or the poor quality selection of the wet cells that were used. If someone had a similar experience and got it resolved I would also appreciate some advice. My advice in the mean time is to think carefully when buying Dyness batteries and you want to assume the 10 year battery warranty is valid when comparing to other brands. This one B3 battery failed after 2 year and 2 months and it was not really worked hard with the full stack only going about 12 times to 80%dod and the rest of the time to 50%. So the battery could have given me 1400 kWh out if the possible guaranteed 16800kWh ( 3.5 @80% dod x 6000 cycles ).

Some interesting reading from SSEG.org.za https://www.sseg.org.za/municipality/city-of-johannesburg-metropolitan/

Maybe old..... City-Power-Embedded-PV-Generation-Application-Form-V2.pdf City_Power_Install_Standards.pdf

Hi, The electricity suppliers argument holds true for an installation without a sufficient battery system that also uses or consumes large KW power during the night. However , 1) Most of the domestic Solar PV system users in South Africa also has a battery system installed that carries them right through the night and early morning , that includes as well as during South Africa' grid peak. Currently these installations can or do feed their excess power back to electricity suppliers at way less than the current generation cost. In same cases even normalises/improves the voltage on the network. 2) Most of the Rural factories and farms only operates during the day and at night the factories is closed. 3) The businesses/factories that has deployed in their parking areas and roofs solar systems that uses large electrical loads at night could be the only ones that can somewhat be blamed by electricity suppliers. The right logical way for Nersa and electricity distributors to approach this is to disallow large power consumption at night if there is no corresponding battery storage on site or wheeled to compensate/handle the night and early morning load. With disallow I mean regulation that disallows/outlaws night usage or force battery storage. Even more friendlier or professional is to do the actual battery storage installation and required hardware themselves at these installations at a large % discount and even if the extra storage is used they can then charge the units used at night from these extra installed storage at the calculated recovery rate required. This is how Businessmen thinks not lackeys that now try to recover their inefficiencies from the populous. Some or all the of the cost can be carried by the consumer. This would not pose a financial burden on the industry off course they will have to burden their grey matter to some extend. The strategy of increasing the daily fixed charge will only result in more paying customers disconnecting from the Grid and thus cause the feedback benefit being lost that could have helped all South Africans..... I think we do not have competent tariff designing experts/businessmen or strategists working at Electriciy supplier.

Hi see https://github.com/mletenay/home-assistant-goodwe-inverter/blob/master/custom_components/goodwe/goodwe_inverter.py for detail and say thank you to https://github.com/mletenay