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I ordered another another msb Controller
It was a little damaged so I decided to test it
I hooked it up to a spare 12 volt battery
Then I used my CV cc power supply on the solar panel input
This way I could limit the current
If broken no deafing bang or light speed shrapnel getting me in my eye balls
It worked ok so far no big loads yet
But I did run across something cool
The controller looking for the highest voltage and amperage showed its self on the display of my power
It was neat to watch it pull the voltage up and down
It would try to pull more amperage voltage would go down
Then it would raise the voltage until it would get the highest of both voltage and amperage
So I tuck a few pics if you look closely the wattage of both matched also
The pics show it going up and down finding the most watts
The make sky blue controllers are packed really good
AT least the ones I have bought are I was gave a few of them by a incredible person
Shipping damages is crazy now days
I don't blame the employees they are probably over worked and under payed
Keep in mind I I only buy from one seller on ebay
Sean Buckner is the ebay seller I buy from
If you have any issues he is fast to respond and more than fair
I thought I might have a issue with the above controller so I texted him before hooking it up
Without knowing if it was working or not he offered to replace it
This kind of service is not heard of now days
That's why I only buy from him
Genetry solar has also been over the top good to me when I buy from them
I feel when we get good service we should let others know
That way the good businesses grow and the bad wither away
I will try to find the link or take a pick and post it for the right Ebay seller
https://www.ebay.com/itm/372791424040
This is link to make sky blue 60amp mppt charge controller with wifi it costs a little more
The one tested above costs around 120 bucks
But the link is to make sky blue usa the good seller I buy from