Voltage Input question with Classic 150

[shawn_1976]

I have 750watts of solar. 3 250watt 60 cell panels. Panels are wired in parallel. Charging a 12V battery bank.

I an adding an inverter to the system. The inverter is 24V. I reconfigured my battery bank to 24V. Do I need to reconfigure my solar array for higher input voltage? Or will it charge fine in parallel. Not sure if the Classic will bump up the voltage to charge properly.

Thanks for any input you may have

[dgd]

Shawn,

These 60 cell panels likely have a max power voltage, MPV, about 30 volts. So keeping these in parallel  will not provide enough headroom voltage above your 24v battery bank to enable MPPT battery charging to work very well.
The easiest solution is to rewire the three panels in series to give an MPV about 90v and the Classic will work nicely with this input voltage.
A better solution would be to obtain another 250W panel, prefereably same as you already have, and wire the four in wo strings of two in series. The MPV would then be about 60v.

dgd

[shawn_1976]

My plan was to add 3 more panels. You are correct about the 30v. I just wasn't sure if the controller stepped up the voltage the same way as it did stepped it down. I will just buy my other 3 panels earlier then I had planed

Thanks

[dgd]

Yes, three strings of two panels would work real nice and it gives you the option of trying two strings of three panels if you have some distance between the PV array and controller.

dgd