Solar Charger & Truck Power Question
I've recently installed a Go Power! GP-PWM-30 30 Amp Solar Regulator because the previous owner had solar installed but no charge controller (he just had a simple diode or voltage regulator that conne...
Forum Discussion
HMS Beagle wrote:
It is correct. Theoretically (and in unusual conditions) you can have current without voltage, and practically you can have very large currents with very little voltage.
The terms "voltage source" and "current source" are engineering terms.
SIGH.
The engineering terms are "constant voltage" and "constant current", indicating which parameter is regulated......as the load changes.
And you can NOT have current flow without voltage; you just CAN'T.
It is Ohms law and a zero in there gives a ZERO result.
And finally, when charging batteries, the current usually is limited by the design of the charger (size of the windings in the transformer or resistance of the internal circuitry) so that you can get maximum current flow when the battery is near dead. Then as the internal resistance of the battery comes up (along with the charge) the charger needs to be voltage limited (regulated) to prevent the voltage from going too high.
A cheap "trickle charger" needs none of that fancy stuff because it is both voltage and current limited by design; but some of those will have a max. voltage that is too high and allow a "trickle" that is too big over long periods of time.
