I'm not trying to argue. I'm merely stating that customers have demanded of us to get involved with fast charging.
The sad truth is operators don't take care of their trucks, batteries or chargers. A very small percentage do.
As the only battery manufacturer of high capacity lift truck batteries, we totally believe in productivity savings from using the highest possible capacity batteries per cubic inch in a lift truck compartment.
Most fast charge applications aren't really heavy duty applications; therefore heat isn't a factor. Less than 10% of the fast charge market is trully demanding. The whole big three car market in fast charging don't trully fast charge. The big three see savings in not changing batteries out and optimizing on one third of the batteries that they normally require. They also don't have to pay battery room maintenance people or battery changers at $100,000 plus a year.(No lie with over-time and benefits) Safety savings alone on UAW Workman Comp benefits on battery changeout issues alone are worth the savings in going to fast charging.
As for cost, not all fast chargers cost 10 times as much as conventional chargers. 80% of our ROI studies show a ROI savings of.3 to.9 years by merely eliminating the extra batteries, because in most applications customers are going to get 4+ years out of their single battery.
Conventional battery rooms are operating or charging 24 hours a day, because the spares need to be charged and cooled. If you have 3 batteries per truck or pooled batteries, then the chargers are always charging. Fast charging may have higher peaks but that depends on the operation. Most customers stagger breaks somewhat, because they aren't shutting down their operations for breaks, it isn't productive. So the practice of 24 hour charging of conventional chargers is always putting back 5 to 10% overcharge everyday is wasteful for energy conservation. Whereas in fast charging, charging to 80 or 90% and reducing gassing is basically more efficient. The overcharge is only done on weekends. Fast chargers also can be a lot more efficient with much higher power factors(PF), because they use IGBT's(93%+efficiency and PF of near unity). SCR chargers have effieciencies of 83 to 89% and PF of.55 to.70. Ferros have efficiencies of 73% to 93% and PF of.87 to.91. Every manufacturers conventional chargers ratings are all over the specrum. Fact is IGBT's are much more controllable in profiling and saving energy. Infrastructure is a different matter. Our IGBT's can almost always co-exist on standard charger lines of 30 amp services, until you get to the 30KW or larger models. The competion fast chargers that use SCRs jump to 60 and 120 amp services.(A major cost difference in infrastructure cost).
One last thing about ANSI / OSHA standards. We never state on cutting back on standards, but charging one third of the amount of batteries usually requires less ventilation, and charging throughout a facility can reduce the need for that ventilation. We are required by OSHA to limit Hydrogen evolution to 1% before needing ventilation. We are very observant of that regulation. In my 15 years of application studies I've never seen a customer even with a battery failure to exceed 1%. 4% Hydrogen evolution would require charging in a closet or small sealed room with no ventilation. We don't promote that.
So as a customer, people need to do their due diligience and get the whole story. Training is necessary with fast charging, just as it is in conventional charging. If you have poor conventional charging practices then you need to rethink all of your processes, because down batteries or missed charges can mean down truck or no productivity with fast charging. Of course that can happen with conventional charging also, but it usually takes longer.