Quote:
Originally Posted by tuberider
I have 4- 12v 100w flex panels and want to put them in series for 48v. I have a blue sky 3024 controller and contacted Blue Sky but they said it will only support 24v and I don't want to series parallel them. I tried it anyway and the controller worked great for a few months but quit. Is there a solar controller out there that will take 48v and convert it to my 24v batteries.
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Aha!
Going back to your original question
these are the specs of your controller, terrible cut and paste so you can read the whole thing here
http://www.blueskyenergyinc.com/uplo..._datasheet.pdf
Output Current Rating
Nominal Battery Voltage 12 / 24VDC
PV Input Voltage 57VDC maximum (Recommend Maximum VOC @STC <=45.6VDC
Power
Consumption
0.35W Typical standby1.0W Typical charge on
Charge Algorithm 3-stage Bulk/Acceptance/Float Plus Equalize
Acceptance Voltage 14.4VDC (range 14.0 – 14.8VDC
, 10.0 – 40.0VDC
)
Float Voltage 13.2VDC (range 13.2 – 13.8VDC
, 10.0 – 40.0VDC
)
Equalization Voltage
15.2VDC (range 10.0 – 40.0VDC
)
•
automatic or manual operation
Single output field configurable as either: 20 Amp load controller –or– 2 Amp auxiliary battery charge
Bottom line is your controller can handle an open circuit voltage of 57volts but it is recommended that this not exceed 45.6 volts. It is quite possible that you exceeded these voltages on a sunny day as 4 x about 17 volts (typical of a 100w panel) would be about 64vDC
, you will know what sort of voltages you exposed the controller to by reading the Open circuit voltage on the back of one of the panels and multiplying this by 4. Next time buy a controller that has a max voltage higher than this voltage (like a
victron etc). If this Blue sky unit was still operational it should
work with two series strings of two panels,connected in parallel. which would only expose it to about 34VDC, comfortably inside its max.
Keep asking, you are getting there
Mark