Pairing up the Eco-worthy 20a MPPT controller

westend wrote:
With this talk of two controllers, it raised a question: Is there any problem with connecting two controller outputs to the same pair of wires and then leading that pair to the batteries?

That's just a parallel of the two controllers with extended battery posts. You don't save much wire if the controllers are both close to the batteries. You can save wire on the input side though. (PWM)

Last year I posted about my use of a Y on the input side using two controllers. I had 330w of array (a 130 and two 100s in parallel) to one long wire pair towards the battery bank, then the Y near the battery bank to the two controllers where each would supposedly take half the amps. Each controller was on the same battery bank. (could have been on separate banks I suppose for this exercise) This was to save having two long pairs from array to near the battery bank with a split array like the 130 on one long wire and the two 100s on the other long wire.

The Trimetric showed all the amps from the 330w was arriving at the battery bank, but I was not able to measure how many amps each controller did (no clamp on meter). Likely not quite equal since R of each leg not likely perfectly equal.

So that works ok.

BTW I am now just an MPPT guy (How low can you go? :( ) I am down to a JiminDenver 230w plus Eco-W set. Another camper here has my Sharp 130w panel and the RJ Special to run it. I kept the Solar30 in case I ever get another 12v array. So after all that we are back to where we were three years ago when I found out that 210w was perfect for us. Got to stop fixing things that ain't broke!