You should know that 40a is what a controller is, I also think it's max 720 watts, read the instructions with it, I have 600 watts on 3 x 200 panels, I draw 2 kilowatts a day, winter spring, fl. I have 6-6 volts 215 amps. Sam's Club Hour Batteries. At 10 o'clock I am fully charged with 14.5 volts. This controller is so reliable after 3 months of use that I exceeded the advertised 520w or so because the manual says it can exceed those limits and if the amps are bigger it will just lose power. Really I need more batteries, just read the user manual, you can download this controller and it will handle it.
Tool set Ombra OMT82S12, 82 pcs, brown
22 Review
Bit and socket set Stels Tool set, 1/2", 1/4", CrV, plastic case 94 pcs, Stels, 94 pcs, black
46 Review
Xiaomi Mijia Ratchet Screwdriver 16 in 1 Screwdriver with Interchangeable Bits, 10 pcs, Black
22 Review
Reversible Mi 16-in-1 Ratchet Screwdriver
21 Review