I have a single 100 ah flooded lead acid house battery. It powers a fridge, water pump, lights, fan inverter and tool battery chargers.
it is fed by a yandina combiner and solar.
I want to add shore power.
What shore power converter contraption do you recommend?
If wanting to simply add shore power to charge your single house battery while parked, you can't go wrong with a
NOCO Genius GEN1; a single bank, 12v, 10-Amp fully-automatic smart marine charger and battery maintainer.
It does
not produce power on it's own, is
not a jump starter, but takes your AC shore power and smart charges your battery (or batteries if you get a GEN2 or GEN3 etc) while hooked to shore power.
NOCO has other products that do provide a charge of their own that are often confused with these.
I've had the
NOCO Gen2 Mini, similar to image below, for almost four years for the dual 50ah Odysseys (2 bank in NOCO terms) in my trailer and love it.
I'm rarely hooked into shore power, though when I am, this NOCO handles the job expertly and efficiently; it equalizes the charge between batts, desulfates, and maintains without overcharging, etc. It is also waterproof.

..
NOCO has newer versions of the Genius GEN series; more compact, faster charging from shore power, that handle lithium batts as well, if thinking of an upgrade to lithium at some point.
If so, you may be interested in the
NOCO GenPro 10x1:
.