Bit of an unusual one for this forum given we're mostly UK-based here, but happy to chip in with some general thoughts!
EG4 isn't a brand that's crossed my radar much over here — we tend to see Pylontech, Fogstar, and the occasional BYD rack battery doing the rounds on the second-hand market. But 12 x 100Ah at 48V is a serious stack regardless of brand, so there's definitely someone out there who'd want it.
A few thoughts on shifting kit like this:
- Facebook Marketplace and local Facebook groups are genuinely the best place for large, heavy items — avoids the nightmare of shipping server rack batteries across the country
- Craigslist (still a thing in the US, I believe!) for local buyers
- r/SolarDIY on Reddit has a decent classifieds-style community and people who'd recognise EG4 kit immediately
- diysolarforum.com is probably your best bet honestly — very US-centric, lots of off-grid folks who'd jump on rack batteries at a good price
What inverters are they? That might actually be the easier sell depending on brand — a pair of decent inverters can move quickly if the price is right.
Worth getting the full spec sheet together, photos of the BMS displays showing cycle counts if possible, and any original packaging. Buyers will want to know the history.
Anyone else here with US connections who might point this person in a better direction? We're a bit limited on this side of the pond for Iowa-specific advice! 😄