Dabbling with solar. Looking for a single 500w panel to keep my battery full with 400w usage

Hey, have a look at Solar Panels (top left) of Midsummer Renewables. They have 450W panels. For one off stuff, have a look at their clearance stock. Or 'Damaged panels available for a discounted price due to minor damage to the panel faces or frames. Sold as is.' Afaik could put a multimeter on it to check it works before buying it

just be aware that the 450w and the 550w are physically bigger panels. It's not that they are more efficient.

Eco flow delta 2 has a min/max input voltage of 11/60v so you could try getting 2 panels with a voc lower than 30v, preferrably around 27v to leave some headroom. I've got couple of bluetti's and i over panel them but keep within the voltage specs. I use 2 405w panels and the bluetti has max 700w input but its all ok as voltage within spec.

That would be perfect i'd say, similar to what i've done with 2x405w panels to try and ensure i get the 700w max of the bluetti mppt most of the time.

Did you see if Kellihers in Cork have what you need https://kellihers.com/

Give them a call.