When you say drawings are you referring to schematics with the parts noted like batteries and panels and inverter?
I have checked the solar store on this forum and it looks very competitive with what I can buy locally but I like ti walk into a place and know if I have hassles they have my back.
Thank you Coulomb - we have the kit and it used to work but my dad “played” with the settings and now it has an interruption every time the mains is switched on and off. I checked the PAL setting and they are both set as such.
do you have any other suggestions of things to try?