I have a Victron EasySolar 48/5000 with colour control, 6 x 330 watt solar panels and 8 x 6v 300ah Narada Lead Carbon batteries. The site is completely Off Grid, No Cellphone coverage or internet. The solar charge controller bluetooths to my phone but the Multiplus does not. Error 38 comes up if I run the backup generator for more that 45 mins. I think the Multiplus is set to a higher charging voltage than the Solar Controller and this causes the error 38.I need to check and change the Multiplus settings as shown in the Vicron Connect Demo . I am not sure witch Dongle device I need, can anyone advise me, Thanks.