Sportzfann
New Member
- Joined
- May 17, 2020
- Messages
- 93
I ran 8/2 to the roof inside a 3/4” flex i can add another pair if needed, but like the one controller idea rather than two.Yea that’s the “magic” of the mppt’s. If you had a cheaper older pwm solar charge controller it just puts the amps into the battery- so a 40-45a pwm would be the right size.
But the mppt’s convert the excess voltage to amps and put it all into battery at the proper voltage.
Remember it may be cheaper for you to split your solar array from 2S2P into two arrays of 2S (or maybe 2p - need the exact specs of the panels to know if that’s better), run another set of cables down from the roof and just buy another 150/45. Versus buying a 150/70 or 80 and trying to sell the 150/45 - it may be cheaper but more work running the cables. Just changing out to the 150/70 or 80 will be a lot easier. Remember you will need to increase the size of the wires from the mppt to the bus bar/battery.
Good Luck!
I will look at the 150/70 or 80. Would going to an all parallel setup be any better? I don’t really have room to add panels but want as much as I can get out of what I have. I might get the tilt brackets at some point to get some more watts during the winter months, I hoped to have enough PV to charge back to 100% in a day. I am using about 50 to 100 watts consistently to run things from my batteries while boondocking. Add the appliances to that number, microwave, etc. I didn’t really think about how the controller would take the additional volts and convert to more amps, so like I said a learning curve for me…. Thanks for all the replies!