MPPT Choice ??

Thanks TechWriter.

smkettner wrote:
The 60a may clip power some depending on how big the battery is.
You need the $$ 80a if you expect to run these four panels in series. 600 volt rated.

Consider a Midnight Solar Classic 200. Input 200 volts, output 74 amps.

CLASSIC 200

The Classic 200 is a good choice.

Here's a link to the Classic Sizing Tool, and the results of 3 different panel configs:

SERIAL CONNECTION


PARALLEL CONNECTION


SERIES/PARALLEL CONNECTION

In parallel you'll need 50a wire.

600 volts is pretty standard system rating for panels and MC4 cables.

Controller will also have a maximum input voltage rating. My Morningstar will disconnect if panels get over 150 volts.

Four panels in series Voc at 37.4 will be approaching 149.6 volts on the controller as the battery tops off. And a bit higher in cold temperatures.

I would be a little close for comfort on a 150v rated controller.

Two panels on the back, One mid ships & the last towards the front. Thinking of connecting parallel thinking about shading.

Thoughts?

smkettner wrote:
You need the $$ 80a if you expect to run these four panels in series. 600 volt rated.

Does 600v mean the maximum voltage allowed to course through any one panel in a series array?

The 60a may clip power some depending on how big the battery is.
You need the $$ 80a if you expect to run these four panels in series. 600 volt rated.

Consider a Midnight Solar Classic 200. Input 200 volts, output 74 amps.

CLASSIC 200

Wow.. you'll have quite the setup. I'm jealous already. Now...

The panels are nominal 20v. Never heard of that before, but it's irrelevant considering that really nice controller with the 150vdc input.

mchero wrote:
Should I step up the Charge Controller or should I be AOK?

I assume you're looking at the 60a one? I thought I saw 2 on that page.

Now, if 60a means that's the maximum rated output to the batteries, then you may have a problem. Let's say that array pumps out 850w on a really good day. Assuming a 12v battery array, 850/13 =65+ amps. I think a 24v battery array would work better.

Something to chew on.