From your customer base that has these installed, have you started to get a feel for the expected longevity of these batteries, either in year or number of cycles? Or, have you tested any yourself?
If they are designed to go 'really' deep in the cycle and operate under PSOC, then what sorts of failure mechanisms remain? Heat only?
If they significantly outlast other AGM's, then their economy becomes obvious.
I was one of the first in the marine industry to have a Firefly, Nigel was the other. Nigel's experience parallels what I have seen. He is using his on his own boat and I have been beating the piss out of mine in my in my shop/lab/test bench as well as on my own boat last year..
When I got the battery I was sure carbon foam
was another BS fad and I set out to try and prove that. So far the battery is winning.
Nothing I have done to it has resulted in a loss of capacity.
-- That battery was used in the Practical Sailor PSOC testing
. It survived with all its capacity when no other AGM did.
-- After the PSOC testing the battery was left to sit for three months after a discharge to 20% SOC in temps between 90F and 70F. It recovered all its capacity.
-- It has had no less than 40 complete discharge capacity tests to 10.5V and still has all its capacity.
-- It has undergone nearly 100 cycles to 80% DOD and it still has all its capacity.
-- I took it "car camping" with the kids, installed on my brother-in-laws camper (his battery was dead) and we used an inverter off it. By day three the inverter kept shutting down on low voltage.. The kids kept turning it on and it would eventually hit low voltage again and shut off. LVC on that inverter is 10.7V. It was four weeks before my brother-in-law got the battery back to me, at a resting voltage of 11.1V. I charged it, cycled it, charged it and tested Ah capacity and it still had all its capacity...
-- It was used on my own boat last year and never charged beyond 13.8V, which is my LiFePO4 batteries charge voltage. Despite 9 months of never seeing more than 13.8V, for about 20 minutes at a time, the battery still has all its capacity.
-- This winter it has undergone another 42 cycles to 11.7V and still has all its capacity..
So to answer the question, yes I have tested it...
While I certainly don't have long term data what I have seen thus far is darn impressive. I've not seen any
lead acid battery perform like this.