Re: Hi & balancing a Xantrex C30 & XW MPPT 60 Charge controller
Welcome to the forum.
No, you do not need one charge controller per panel. That's just nuts. Let's pretend it's a misunderstanding and move on.
The problem is that the two different controllers can't "talk to each other". The closer you can get the charging settings on both, the better off you'll be. So same Absorb Voltage, Absorb set time (or current limit) and Float Voltage. The trouble is they also will not be sharing battery temperature information and they may not agree on what the actual battery Voltage is. The larger controller brings the Voltage up to 29.6, the smaller one thinks 28.4 is right so anything over that is "charged" and quits.
If the C35 can be reconfigured to more closely reflect the settings on the XW MPPT someone around here will know how to do it.
I'm an Outback man myself. Our motto is " No worries!"
Four 175 Watt panels, OB MX60, 232 Amp hrs, OB 3524, Honda eu2000.
Ohm's Law: Amps = Volts / Ohms
Power Formula: Watts = Volts * Amps