Burntwick

Thanks everyone for your input, I really appreciate it! It really does look like I'm getting the run around from them. It's annoying my first battery took a month to sort out and that was only because we had to start chasing them up. I'm assuming they are pulling this tactic because the second battery is going in not long after the first. Considering these batteries are only 2 years old this isn't really giving me confidence in the brand...

Hi Let me start by giving some background first. About 2 months ago I had one of my 2 Hubble AM2's (the slave in my configuration) sent back to Hubble as I noticed the capacity overall was significantly lower than usual. My installer came round and found that the battery had a dead cell. It was sent to Hubble and remained there for over a month (a number of reasons from Hubble). When it came back the battery was reinstalled and I left them to charge up again (I think the slave was at about 60% and the master was 40%). My installer checked both and found no issue on the master or slave. They were both fully charged overnight. Even from full, the slave would always drain down at a slower rate than the master, with the master always being completely empty while the slave had about 4 LEDS left (from the 6 below each battery). I tried to drain them both down to 20% and tried charging again. No luck. I tried Hubble's battery reset method, but the problem remained. They were also charged individually, and I found that when the inverter was showing around 30%, once disconnected, the master was around 7% while the slave was around 30%. I even had the firmware upgraded again (although my installer had already done this previously) but still the problem remained. Keep in mind that the slave that was returned seems to be behaving quite well now. It is now the master battery that is giving the issue. Now for my query. My installer has kindly taken the master battery back to Hubble, but now they are asking for a COC. Why would there be a need for them to be asking for it? I do actually have the COC after the installation was completed, I just find it strange that they would want that. Surely anything out of the ordinary would already be logged to the BMS? Has anyone else been asked for their COC?

Hi Achmat I thought I'd posted a reply before but it seems it never submitted. Thanks for the response, it seems that the derating isn't too critical at the temps I might be expecting. Brandon

Hi All I'm quite new to the forum and I have to say it's great, there's been a ton of info to go through! I'm busy planning an installation at home and I have some idea of what I want from the installation (8kW inverter, 10kW batteries and solar) One of the things (among many!) I've been thinking about is the placement of the inverter. I want it in the garage at least for noise reasons but I've read about the derating of the inveter (I'm thinking of the Sunsynk 8kW). I have a flat concrete roofed garage with no windows so it gets pretty warm in summer (it's about north facing and the door gets hit directly by the sun for most of the morning/afternoon). I haven't measured it but I would probably guess it was at least in the high 30's last summer. I've looked around but I couldn't find much info about is how much of an issue it is. I see SunSynk's manual just says derating over 45deg. Has anyone experienced any issues or found the inverter actually dropping in effeciency when approaching something the 40's? Thanks, Brandon