Is there such a beast?

Almot wrote:
...2 people told you this :)

Okay, Dad. :B
Saw MC4 and thought it was a go.
Oh, well - little grease never hurt anybody.

ON EDIT: And making those inexpensive mistakes is how we learn, isn't it? Sometimes, they're even expensive mistakes (been there. Done THAT).

But we all had to start somewhere, even you pros! :)

Sort of.
HC4 is the same design as MC4.

But I would shop around for MC4. 2 people told you this :)

MC4 is the connector name and also brand name (Multicontact something in Illinois). You buy Ebay thingy that looks like MC4 and then need a grease to mate them because it doesn't fit well or O-ring is missing or one out of 4 will break at the prongs. Take your chance.

I ordered these...they were almost half the cost of the other type.
Right ones (I hope!) ? :)

#2 is the same Y-connector as #1, only with a pigtail.
In either scenario you'll end up with one male fitting and one female, for a pair of 2 panels.
I don't see much sense in #2 (unless they are cheaper than #1), as you'll probably need several feet long MC4 #10 extension cable anyway.

Make sure they are MC4 Y, because occasionally there are other Y-s sold in solar stores (both kinds, i.e. with and without tail).

11A current is high enough to check V-drop as well. Might need MC4 #8 extension from Y to controller, - not #10. Depends on cable length.

The Y connectors.

OP here...still trying to figure this all out. So, I put my two panels (1 flexible, 1 framed) side by side to figure out how the heck do you connect them??

I need these to join the panels in parallel?



OR these "Y" connectors?

It's not common having MPPT with 2*100W. Important numbers with MPPT would be Imp (not Isc), and Voc.

With MPPT you can wire in series too. In this case, the panel with lower Imp will force the other panel into same Imp, this will drag the total wattage down - a little. Not too important, you can still wire these particular panels in series as long as total Voc is within the controller input limit.

Series wiring is much easier than parallel. You just use MC4 #10 cable all the way to controller.

One drawback of series is that higher voltage results in lower MPPT efficiency, but with voltages as low as in your case, I wouldn't worry.

I can't agree about exceeding the Voc input limit of controller. You can exceed MPPT current rating, yes, - TAD. But I don't remember any MPPT of "RV size" that could digest excessive Voc with no ill consequences.

Series vs parallel--When modules are in series, you will see a higher voltage at the controller but the amperage of the lowest module. When connected in parallel you will see the average of the two voltages and the amperage is additive.

If you have adequate wiring to the controller, parallel configuration will probably harvest the most wattage. In some cases, with an MPPT controller, a series connection may harvest slightly more, depending on the efficiency of the controller at certain voltages. Most controllers have a maximum voltage input and cheaper ones will self-destruct at that maximum. Better MPPT controllers just choke back the voltage and deliver the maximum amperage they are rated.

Almot wrote:

xyzHollyxyz wrote:

Still compatible to use both in parallel?

Yes.

My panels are 2 x 100W Renogy.
My battery is a brand new AGM Group 31.
My controller is pictured below.
I am beyond frugal in energy consumption:
(use lantern for light, use water from gallon jugs; only concern is fridge, but gave myself a Yeti cooler for Christmas (just in case).

What's the functional difference between connecting in parallel vs. in series?

xyzHollyxyz wrote:

Still compatible to use both in parallel?

Yes.