4 12V 200AH deep cycle lead acid batteries cost $1552 on Amazon and hold as much energy in practice as a 100AH 48V LFP battery which last 15 years, minimum, and only costs about 6% more up front. (Not linking to specific batteries in order to not shill for them, but do a little searching for 100AH 48V 4U server rack LFP batteries on youtube, and you will find dozens of tutorials.) Quality inverters last 30 years, not 10.
Are these people TRYING to light money on fire? Are they fronting for someone by trying to make solar look impractical? Or are they just stupid?
Also, where did you buy your inverters in 1993? I've used about six different brands on various deployments and ten years is about right for MTBF there. I sure wouldn't trust a fifteen-year-old inverter to handle 3500VA continuous, and god forbid there's a spike...