Jayne
New Member
- Joined
- Mar 2, 2021
- Messages
- 14
+1
What is the spec of the SCC max PV input Voltage?
Based on the stciker of the old dual-panel,
Each panel should have
Voc of 10.60V (21.20 Voc divided by 2).
Vmp of 8.85V (17.70V divided by 2).
Imp of 11.30A.
Youe new 100W panel has
Voc of 21.20V.
Vmp of 17.7V.
Imp of 5.70A.
So when you connect one of the old panel in series with the new panel.
The system parameters are:
Voc of 10.60V + 21.20V = 31.80V
Vmp of 8.85V + 17.70V = 26.55V
Imp for series connected panels will be equal to the lowest Imp rating of the panel = 5.70A
So the system panel power will be = 26.55V * 5.70A = 151W.
The panel specifications are correct, with a OC voltage of 21v. You have wired is series thus giving an over voltage fault indication, The PWM charge controller you have is specified for a maximum input voltage of 26 volts.
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Reconnect the panels in parallel. Make sure you have a voltmeter of some type to ensure you get the polarity correct. Connect the battery first to the controller, then the panels.
Mike
Sorry 'resident asshat' typing as you posted.
So if the voltage is in fact different on the two panels I now have (half of the old set + the new one) (which seems likely), can I still wire them together in parallel?
And if so, would I need to do anything different than following the basic instructions I find online (using y-splitters)?
My "I'll just get a replacement and make sure I wire it the same" project has now officially turned into "a learning experience" ?