As you say you are older than me on this site, if that is the case then you should know that others may input some help regarding our problems.
Whenever I post a problem I know that others will be reading this & try to help me, sometimes they may be way of the mark, but then that could be put down to my bad explaining, but I do not fob them off because of this, if someone wants to put in their 10 cents worth be it right or wrong I do not get upset as I am probably just as guilty at this as they are. We are human, plus it is very hard to fix someone's problem especially when you are not with them & all you have is just a list to go by.
I do hope that you get your system up & running at optimum levels with low voltage, my system is probably a candidate for voltage overkill but then I have solar panels on my roof, which I use to compensate for this.
Ben.
PS. Good Luck.