Fun and games :-)
OK, for anyone seriously interested in Pulse Width Modulation (PWM) technology used in battery chargers
(not the same as the little pulsers we've been talking about early in this thread), there are some good papers out there.
Here's one: Morningstar - The World's Leading Solar Controllers and Inverters
Just hit the "download now" button to get a copy of Morningstar's "Why PWM?" white paper, complete with tech notes, references
, etc. Not a bad summary, IMO.
Morningstar and Iota
are two manufacturers which produce PWM-based chargers suitable for marine
use. I have two of the Iotas (a 45-amp model and a 55-amp model); both have performed beautifully and have maintained battery
capacity very well over a couple of years without the need for equalization
So well, in fact, that I'm thinking of adding another Iota to my house battery
bank on the boat
which is now maintained by a high-end smart charger
(Victron Multi-Plus) which is great but which doesn't do as good a job of maintaining capacity and preventing sulfation as I believe does the Iota.
It's either that or more frequent equalization
cycles on the house batteries
BTW, PWM has been developed rather extensively in the PV (solar panel) industry.