mppt vs pwm

Salvo wrote:
That's the description to search for the maximum power point. In order to do a complete search, the controller needs to do a sweep. There may be several peaks and valleys in the I-V curve. The first peak that the controller finds may not be the larges peak (meaning it's not at the maximum power point). Hence the sweep.

However, this has no relevance when the controller is in absorption mode. The controller doesn't care about the maximum power point. It outputs a constant voltage.

brulaz wrote:

jrnymn7 wrote:

...
So, is the "mppt-capable" controller still doing something the pwm cannot do? IOW, Can the pwm raise or lower panel voltage to accommodate for variances in lighting, or just for variances in Vbatt?

dunno about pwm controllers.

But JiminDenver's quote about MPPT controllers pretty much agrees with Rogue's manual. Rogue talks about occasionally doing a "sweep" of the panels (guess that means changing the voltage and seeing what happens), especially when changing modes. And it the frequency of "sweeps" can be adjusted.

But it also "dynamically" checks panel output as well without a sweep. Much of this is probably proprietary, but my guess is that in MPPT mode is constantly trying adjacent voltages to see if the current output increases.

Would there not be any adjusting done then, such as lowering amps, to maintain that constant voltage, in the case of low light?