Reddit reviews Renogy 150A High-Precision Watt Meter and Power Analyzer, Black

For solar, buy anything that is Renogy brand. VERY nice stuff and well respected.

Here's the panel I use:

https://www.amazon.com/Renogy-Watts-Volts-Monocrystalline-Solar/dp/B00DVPPFDS/ref=sr_1_1?ie=UTF8&qid=1484425808&sr=8-1&keywords=renogy+50+watt+panel

And the crappy PWM controller. Bought it because it was cheap. You really want an MPPT controller, but they're expensive and bulky. You can google around for the what and why, but this works for me.

https://www.amazon.com/Docooler-Controller-Battery-Regulator-Protection/dp/B00L37KZI6/ref=sr_1_2?s=exercise-and-fitness&ie=UTF8&qid=1484425831&sr=8-2&keywords=solar+charge+controller

I have a box full of these things though!
https://www.amazon.com/RENOGY-High-Precision-Meter-Power-Analyzer/dp/B00PSQPSWQ/ref=sr_1_2?ie=UTF8&qid=1484425929&sr=8-2&keywords=renogy+meter

Great to know what's coming from the panel, and coming out of your charge controller to the batter... or how much you're pulling OUT of the battery. 3 is ideal but if I'm out overlanding or camping, I wont use any of them. They're helpful and fun when you're setting up your kit.

So I actually was going through all the colors and functions on it last night for other reasons and wrote out a quick table.
we did minimal brightness and highest of each color

most expensive [in amps] color was purple, pulling just about 2.3 @ full brightness

cheapest was one of the two blues pulling just under 1.1 @ full brightness,

putting the same "cheap blue" to the brightness we actual use regularly, we were pulling .7 [it was fluctuating but not by much] if we dropped it down to the most minimal we can get away with while still being able to see it hits that .1 range

We at max were able to hit 4.6 amps pulled. This was when the lights were full brightness and we had the music feature turned on [it blinks and changes color to loud noises] I saw 5 amps get hit during [flashing purple] this test, but I couldn't get it to draw constantly 5 amps ever. I also had a draw going to a USB bus at this time so numbers are likely a little inflated

I was tracking via this monitor