Background: I'm a survivalist. One of my post-collapse businesses will be bartering and charging batteries. Since this is a post-collapse scenario, the objective is to be able to work with a set of solar panels, and not use 120VAC. Yes, you can have inverters to do stuff (and I have multiples on hand), but the most efficient, least-loss approach is DC to DC, and eliminating the inverter takes a really complex component out of the MTBF calculations.
I've got AA/AAA charging covered (multiple Maha MH-C9000s on a RigRunner hooked to my solar system) but need to address Lead Acid. In a post-collapse scenario a lot of UPS units are going to get scavenged, so people will be bringing these batteries in for charging, not to mention car batteries.
Now, I could simply use a solar charge controller to do the job, but I'm wondering about the four-step algorithm for optimal SLA charging. Is there a SLA/AGM charger out there that uses the standard 4-step algorithm as described by Deltran, but runs on DC? I'm thinking I could set up a 24v battery bank to run such a charger (would enable charging overnight), but is there a charger that can do this out there? All the ones I can find take household current.
Has anyone taken a Deltran unit apart and figured out what the internal power supply is producing?
Or would I be better off using a solar charge controller and just charging during the daytime?