I was having serious trouble figuring out how to fit them all into the right side of a bay (across from my genset) because they wouldn't all fit just sitting flat (this is an example of where a properly sized forklift battery would have saved a great deal of effort). I was considering how I would make a super-sturdy platform for the batteries (having the batteries fall would be a catastrophic and dangerous failure), when my Uncle Jerry realized that AGM batteries could be mounted in different positions. We checked with DEKA, and sure enough we could place the batteries sideways, making enough room to fit them and still have room for the inverter in front. Thanks Jer!