mppt vs pwm

smkettner wrote:

jrnymn7 wrote:
"BTW who has 150 watt 24 volt panels?"

SMK, That was my first thought, but apparently there are quite a few to choose from.

A 45a controller seems a little on the low side?

600w in = 600w out, 600w / 13v = 46a output + 20% = 55a

(37.5a output + 20% = 45a)

No need to derate a Morningstar. It can run at 45 amps all day and still handle cloud edge effects or anything else.

Truth is I am lucky to see 45 amps out of my 675 watts flat on the roof. Worst case the Morningstar will just limit amps to 45 but no harm to the controller. Most you lose is an amp or two for a few minutes.

And the 600 is now down to 544 watts so even less need for more than 45 amps. Actually more approaching need for just 30 amps.

As long as the controller can handle it, I agree. I'm just a little leary about maxing out charge controllers. But if in your experience, the Morningstar can handle being (near) maxed out, then certainly.