Yes
I was in homebase and lifted a 5 meter bundle of 15A mains wire, but set it down again when I read the price. £12.99. Ouch.
I'll order some on ebay, I have run out of "kettle leads" to salvage. When you are looking for other cables there are fecking dozens of them, but when you are looking for power leads, you can't find any for USB leads and wall warts
The way it goes.
I mentioned the MPPT, DC/DC bit in case you thought it was a PWM duffer or linear regulator.
Yes the controller and monitor runs off the battery, but it doesn't seem to show internal load. It registers watts and amps to 2 decimal places though, so it should. However it does other weird things too.
Over RS485 if you have 1Amp of solar, and 0.5Amp of load it will show:
Panel current: 1A
Battery current: 1A
Load current: 0.5A
There is a separate register for "Charge Current" which would read 0.5A. It seems the battery sense is before the load gets split off. On the panel LCD it does the sums though and subtracts the load from the battery current to be fairer. Over RS485 you have to remember to do it yourself.