VOC max

[cdunham]

Is there any cushion or wiggle room for the VOC on a MPPT charge controller?

I have a 30a Renogy MPPT that shows a VDC of 100

At 24v I can have an input of 800 watts.

I have solar panels, many of them, all at 260 watts and a VOC of 37.8v

Am I just stuck at 2 of these panels if these are the panels I use?

 

[mikefitz]

Connect two panels in series then add in parallel a second pair of panels in series, the resulting maximum voltage and current levels will be within the controller input limits.
You are somewhat over panneled with this setup but controllers just limit the power output to keep within the rated output current. ( the Renogy confirm this in the instruction manual). Perhaps angle the panels to get optimum am and pm power. In practice you will almost never get the full panel rated output.

 

[cdunham]

Thank you. That was going to be my next question. Gotta love solar!

 

[cdunham]

Connect two panels in series then add in parallel a second pair of panels in series, the resulting maximum voltage and current levels will be within the controller input limits.
You are somewhat over panneled with this setup but controllers just limit the power output to keep within the rated output current. ( the Renogy confirm this in the instruction manual). Perhaps angle the panels to get optimum am and pm power. In practice you will almost never get the full panel rated output.
View attachment 34475

Any suggestions on the panel isolator?

 

[mikefitz]

Any suggestions on the panel isolator?

Its optional fit, useful when commissioning or modifying the system. A specialist solar panel supplier should have a suitable switch. With a panel input of around 80 volts and current of 15 amps, something rated over this would be suitable. Most switches will be two pole so you could have a switch in both the positive and negative, This type of switch,

Get A Wholesale solar pv isolator switch For Home and Office Use - Alibaba.com

Buy a wholesale solar pv isolator switch to help you receive and transmit data to the target device. Visit Alibaba.com for other switches that suit your needs.

www.alibaba.com

Mike