Lonny regardless how many amps you have available to charge batteries, you are limited by the design of the battery - dictated by the batteries internal resistance.

For a standard Flooded Lead Acid battery (something you will probably run into the most) "The maximum recommended rate is C/5 (a charge rate in amps of one-fifth the overall battery capacity in amp-hours), but only when the cells are between 10 and 85 percent state of charge (SOC). After the cells reach 85 percent SOC, then a C/10 is the maximum. After cells reach 95 percent SOC, between C/20 and C/15 is recommended." www.homepower.com/articles/solar-electricity/equipment-products/ask-experts-battery-charging-rates

Trying to force too much current into the batteries too fast will result in a surface charge, where the batteries appear full but are not. This can even damage your customer's batteries through overheating and warping the plates. Be sure and research the various battery designs and their charge rate capabilities carefully if you want to start a business as you suggest, so you don't end up being blamed for damaging someone's expensive battery bank. The reason smart chargers were invented was to charge batteries at an optimal rate, filling them completely without damage. Good luck to you in your business venture.

Chip

As a spectator on this subject, I will watch with great interest. I am constrained to point out that Chip's referenced link is from 2006, aeons ago in todays rapidly advancing battery technology space. Those guidelines could well be still valid today in certain circumstances. Lonney's idea may well have viable science behind it or practical documentable evidence, he's promised videos so I look forward to seeing them. Not saying either is right, but it is very interesting. Can't wait to hear other perspectives from other battery systems "experts" on here.

On the surface, Lonney, it looks very interesting. Your other projects look well executed also.

Brian

AGMs have very little internal resistance, especially the spiral wound types like the Optima, Hawker Genesis, etc. I have an Optima and a Hawker Cyclon (a helper battery for a high current electric supercharger) in my car. They can be charged 5 times faster than a typical FLA battery (c/2 - c/3). Lithium batteries can also be charged very rapidly and efficiently, however they are sensitive to charging at low temperatures and overcharging. 30 amps on a 100 amp/hr battery is c/3.3 which is perfectly fine for an AGM, but too high for an FLA.

Some types of batteries can be charged much more quickly than others. I'm just advising to know what type of battery you are dealing with before deciding on a charge profile (charge rate and time for different phases of the charge cycle). If the battery gets hot (warm is normal) during charging it's a good sign that the internal resistance is too high for the charge rate. Modern charge controllers monitor battery temperature and adjust the charge rate to the optimal level automatically, preventing damage to the battery bank from overheating. Just tell it what type of battery you have and let it do the job it was programmed for - simple as pie.

Chip