250 watt / 36 v.

[greenHouse]

What was the 36 volt panel ever used or built for?

36 volt panels are for 24 volt nominal systems. They are also popular with string inverters since they help boost string voltage into the working range with a shorter string.

[patrickp708616]

Thanks!

[Wy_White_Wolf]

36 volt panels are for 24 volt nominal systems. They are also popular with string inverters since they help boost string voltage into the working range with a shorter string.

Depends if that is 36 VOC or VMP. A 36 VOC panel would have a working voltage in the 27 to 28V range and would not be high enough for a 24V system. All the Renesola panels I founnd were ~36VOC.

WWW

[patrickp708616]

Voc / vmp

Depends if that is 36 VOC or VMP. A 36 VOC panel would have a working voltage in the 27 to 28V range and would not be high enough for a 24V system. All the Renesola panels I founnd were ~36VOC.

WWW

The VOC is 37.5 v and the VMP is 30.1 v. So it sounds like I have to go with a MPPT controller with a max 100 vdc input for the panel series at 72 vdc to controller charge at 12 vdc with the 3- 12 vdc batteries parallel?

So as advised earlier I should go with a morningstar mppt controller at 12 v to make it work? In the end, would you call this a good system or a cobbled mess?

Morning Star TS-MPPT 45 on E-bay at $404?

[Naptown]

That is a good controller and it would not be a cobbled together system.