Ifgow can you adjust you're charge rate/schedules so the battery is always doing something? That would help keep the cell temps up.

Failing that, wrap them in some Kingspan (other insulation is available), just don't forget to remove it in spring.

      Ifgow
      Make a cover out of 50mm Kingspan. Foil tape, tape measure and a sharp knife is all you need. It will only take an hour or so. Small thermostatic heat pad optional.

          Crazysquares I wondered about that but wasn’t sure about ventilation requirements for the battery.

              I figured it wasn't an air tight fit as such and has some holes cut for the cabling etc so likely drafty enough. There are no ventilation holes on the battery itself so nothing being blocked in that respect. Worth checking yours for any.

              Ifgow mine are inside, so not an issue for me. Also, I have 2x9.5 and a Gen2 5kW inverter, which effectively eliminates the reduced discharge issue anyway.

              Ifgow there's no ventilation requirement for the batteries, only the inverter. If you had an AIO, the batteries are at the bottom and inverter at the top, so just insulate the bottom 2/3 of the unit.

                    MrMessy
                    Thank you Mr Messy. I am at the design phase of my customised box using 50mm sheet insulation from B+Q, your comment has just reduced my B.O.M. 👍

                      4 days later

                      Thank you Ifgow I'd not noticed this arrive.
                      @admin what impact would you expect enabling this function to have on WW instructions? Specifically would you expect the AIO to return to WW setting post 'tickle' as Ifgow has named it?

                          JayC Yeah, this would interrupt and overwrite any schedules/automations (including WW's) and mess things up.

                            admin I have now found a way to get this information (although me it at least is a little convoluted!) There is a field BatteryCellMaxTemp(℃) in the historical data.
                            To get to this I had to share the plant to myself (different email address to the one Growatt have for me!) and then I get the option to view the "history data" in my photovoltaic devices. (Also had to open the link in incognito mode!)
                            You've got to wonder why Growatt are making this so difficult to find/see!
                            Anyways, I have now boxed my battery in with Kingspan and the battery temp has gone from being 10/11degrees to a healthy 26/27 degrees and now charging a hellava lot better.
                            Loadsa posts on the Growatt Uk fb page have concerned me and I have also ordered a smoke detector to install alongside it!

                                Kevin Thanks for digging this info out. Sounds like a bit of a faff!

                                  Kevin I had a hell of a job getting my smoke alarm (which the installer informed was a regs requirement) to connect. Eventually realised I had effectively built a Kingspan faraday cage insulating the eaves where the gateway and solar inverter live.

                                      JayC

                                      JayC
                                      Before retirement one of the lads at work built a remote alarm system that used the mobile network to alert if anyone broke into a quarry / stone crushing plant ( loads of heavy copper cables to nick )
                                      Everything tested ok so he moved it from a glass reinforced plastic box into a more sturdy steel one. It took a while for the penny to drop as when he took of the lid check the circuitry and connections it started working again....

                                          You can also lose signal if you have too much metal of a similar length to your antennae nearby. I have 2 smart meters and if they are too close to each other they both lose the signal as they each contain a metal antennae of the same length. This is down to the way electric fields work and if nearby bits of metal are of a similar size to your antennae (the aerial within the mobile phone for example) the fields get distorted.

                                          This effect is exploited in high gain TV aerials where there are directors which are the slightly shorter bits of metal than the dipole (the bit where the cable actually connects) precisely spaced on the side nearest the transmitter and reflectors which are the slightly longer bits of metal precisely spaced on the side away from the transmitter. These alter the electric field to focus the signal into the dipole. How well they do this is the aerial gain which is shown in dB. Have a look at a TV aerial to see how it is assembled and look at the adverts as to how much gain they have (which might be linked to the number of directors and reflectors they have).

                                          So it is worth considering any metal that is near to the antennae of whatever piece of equipment you are using (particularly short lengths near the half wavelength of the frequency you're using).

                                          Kind of obsessed now with the battery temp now I've found out where to check on it! In the last 24 hours it has ranged from 24 - 37 degrees.
                                          Wondering now if should drill a few air holes into my box to lower it a little! 😅 Have I insulated it too well? 🤔