2 sets of 2S8P - one set 160 volts, other set 166 volts...
- Thread starter SunnyNM
- Start date
timselectric
If I can do it, you can do it.
- Joined
- Feb 5, 2022
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- 19,076
6v isn't a problem.
But the output amperage will be of the lower rating.
If that's acceptable, then carry on.
But the output amperage will be of the lower rating.
If that's acceptable, then carry on.
MisterSandals
Participation Medalist
Just to verify you have 32 panels?
What are the specs of your panels? Watts, Voc and Isc.
Your 2S8P array may have crazy high amps that unless combined in a combiner box exceed MC4 connector 30A rating.
And you are combining these 2x 2S8P arrays in parallel or series?
This sounds like an unusual setup.
2S4P setup.... not 2S8P.... my apologies.
Rednecktek
Solar Wizard
Whew! That makes more sense.
Are your voltage differences what you're seeing on a meter or on the spec sheet? If the panels are all the same make & model the voltage difference can be something as simple as dust on the panels or a branch casting shade, I.E. nothing to worry about.
Are your voltage differences what you're seeing on a meter or on the spec sheet? If the panels are all the same make & model the voltage difference can be something as simple as dust on the panels or a branch casting shade, I.E. nothing to worry about.
OffGridInTheCity
Solar Wizard
I have 3 arrays of 3s5p - going to different charge controllers. One array started dipping to 2500w mid-afternoon and the others were 3500w... so I was thinking something was wrong. I checked voltages and one combiner box was was showing ~101v (2500w) and the others were ~95v (3500w) when all 3 should have been ~95v at good MPPT levels.
It turns out - that the array/controller with the higher voltage was hitting max Absorb/Float sooner than the other 2... because it was seeing a higher battery voltage than the other 2. Basically - nothing was wrong and I felt like an idiot
How do you have things arranged - is it 2 different charge controllers? If so, one of your controllers could be operating a bit differently thinking the battery voltage is nearing 'full' and backing off MPPT efficiency which would raise the voltage as in my case.
It turns out - that the array/controller with the higher voltage was hitting max Absorb/Float sooner than the other 2... because it was seeing a higher battery voltage than the other 2. Basically - nothing was wrong and I felt like an idiot
How do you have things arranged - is it 2 different charge controllers? If so, one of your controllers could be operating a bit differently thinking the battery voltage is nearing 'full' and backing off MPPT efficiency which would raise the voltage as in my case.
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