It does say on the description of that charger that it recovers deeply discharged batteries so it may work for you.
- This charger will revive even deeply-discharged batteries from 0V with its force-feeding feature. Once the battery has enough voltage, normal charging will resume
), a Victron SmartSolar charge controller MMPT 75I15, with Durite pure sine wave converter. Mostly will run diesel heater (sparingly) and internal lights plus laptop mobile phones if the family join. It has been a steep learning curve today and barely touched the surface I feel!