Ted Moss

In any event, is it true that the Sunsynk is 16s vs 15s of the PylonTech..? (Apologies if I am looking at this matter in quite a limited scope relative to your broad knowledge.)

Hi MafiaMan Yes, I had seen this worrying thread on PylonTech - so maybe one should go for Sunsynk, despite the 5 year limitation on the BMS..? Possibly their BMSs are very reliable in any event? Regards Ted

Hi TheMafiaMan Many thanks for the comprehensive and nuanced response. Have you seen the Australian testing conducted in the link below? I found it fascinating that at that time, a PylonTech battery was only one of two (out of 26) that performed according to its published expectations. https://www.solarquotes.com.au/blog/battery-testing-final-report/# However, I would still like the fundamental question to be answered regarding the possible failure of the BMS occurring outside its warranty period and causing cell failure. I am particularly interested in the Sunsynk 5.32kWh within this context. Regards, Ted.

I really would appreciate some guidance on this issue, that I have not seen aired on the forum. I have committed to a smallish/medium home solar system comprising a 5kW Sunsynk inverter and 10X Jinko 475W Type N panels, sourcing from a local shop that deals directly with large suppliers such as Segen Solar. Regarding batteries I recognise that I need an approximate capacity of 10kWh. My initial considerations were as follows: 2X Revov R100; 2X Sunsynk 5.32kWh; and 3X PylonTech US3000C. Initially I was keen on the Revovs because of their attractive pricing and good reputation, while my local supplier vouched very strongly for the PylonTechs (most pricey) that he said were trouble-free in his experience. I then started looking at the respective warranties, noting that all 3 have an effective 10 year cell warranty. However the BMS is something else, with Revov being 2 years, Sunsynk 5 years and (apparently) the PylonTech being the full 10 years. Of course, combining Sunsynk batteries with the Sunsynk inverter extends the warranty of the latter to 10 years, albeit in a limited way. I have a question in principle that I would be grateful to have answered: Fairly clearly, during that period where the cells plus BMS are covered, the failure of either would lead to a valid warranty claim. However, even a single day beyond the BMS warranty, what is likely to happen in the event of a BMS failure..? Because the purpose of the BMS is to protect the battery against adverse conditions, it is possible that the battery cells might consequently fail, especially if one is not vigilant. In this case, would the supplier reject both the BMS and the cell claim, because the former (no longer under warranty) fault caused the latter failure? Also, does the shorter warranty on the Revov and Sunsynk BMSs imply that these are more vulnerable than the cells themselves..? The above logic, if true, points towards the PylonTech being a good choice; however I have been put off by posts where Segen Solar has turned down warranty claims on these batteries for over-voltage, etc, despite the role of the BMS being to obviate such events. Apologies if this is a bit long-winded or duplicates what has been resolved before, but I would really appreciate informed opinions on this matter.