Reverse‑Charging two 95 Ah AGM House Batteries with ecoflow Alternator?

Has anyone tested the reverse‑charger from the ecoflow alternator on two 95 Ah AGM house batteries? At 13.6 V output, it can’t fully recharge the EcoFlow Delta 2 Max, but it comes close.

On cloudy days when solar under‑performs, is using reverse charging from the alternator for those two AGM batteries in my RV (house batteries only) a reliable workaround? What limitations or risks should I expect? Can this configuration cause overcharging?