I started with epever and they were OK, tried 3 models of renogy because they were recommended and all were hot garbage. Went back to epever and have recently been using Victron. I’d say the Victron are expensive for what you get, but they are bulletproof. If you just want to have a controller you know will work, that’s the way to go. But I have a dozen small pumping stations and fencers, I can’t afford Victron for all of them. The epever controllers are at least pretty reliable.

But Renogy will just fall down and not pick themselves back up. This notion that they’ll go into an error state because the battery is low, then never come back out again until you manually charge the battery up to a voltage they’re comfortable with even if they have plenty of solar power, that’s crap. I went back and forth with their customer support on all 3 that I bought, the response I ended up with always was “well, that’s what they do and we aren’t changing it”. So I put them on eBay and sold them to the next poor sucker. Even when they worked, they seemed wildly inefficient compared to the epever, and miles worse than the victrons.

Nominal 12v panel + nominal 12v battery is good, and the Wanderer will charge LiFePO4 with a canned profile IIRC.

Here’s the next hurdle: I’d expect a 10w panel on PWM to max at ~7w under excellent conditions; we could estimate this more accurately better if we knew the panel specs. And the controller will require a certain amount of power to run its own innards. The Wanderer 10A specs say Self-consumption <10mA but this may be with the panel[s] disconnected, or when the panels are connected but there is no PV input. Or it may really be <10mA in all cases; not much electronics inside a PWM compared to MPPT. If you do it please report back with what you find.

These kinds of challenges are common in very small (experimental, learning) solar setups; when the numbers get larger this kind of challenge largely gets lost in the noise of bigger numbers.