I think I'm about $20-$25US a month for my "homelab" stuff. I am pairing it down quite a bit from the past due to electricity costs. Ours in Colorado\US is .12¢ per hour off peak (7pm-1pm, .15¢ from 1-3pm and .19¢ from 3-7pm. I've moved to PI's or NUCs for anything I need on outside of my usual compute stuff.

No solar yet, but will have a setup once I move to the next place.

host pihole/adguard - get a cheap rasberry pi 3+ and host either of these and never worry about it. I run adguard on one, works fine. I update it every so often and reboot it maybe monthly for the hell of it. Uses a cell phone charger for AC power.

i use AdGuard Home on a pi3\rasbian for my home. For me it worked better then pihole, more stable.