Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Charge Controller Question
#6
(06-19-2020, 05:18 PM)Wolf Wrote: I would have seen that with all my data collection.I know overkill. 

No overkill, not in the slightest, the more data the better as it is the outliers that sit on the edge of the data that cause all the problems.... and data that highlights the problems before the fire engine turns up...


With 48V and typical panels the economics on small systems (less than a few kW) using PWM controllers is economic, even with the loss of arund 10-20% on not tracking the MPPV. Typical 200-300W panels just need 2 in series. For me MSB was at the margin and the higher cost controllers to me kjust don't make economic sense anymore now that panels have dropped in price so much, Just buy more panels and use cheap as chips PWM controller or even a FET array switch controlled from the BMS.

(06-19-2020, 06:32 PM)OffGridInTheCity Wrote: becasue my 80a circuit breakers tripped (and 4awg wire won't handle it)

4AWG is rated for 130A and I have installed km of it for house incomming mains (100A fused)

My solar is fed off two 8AWG and gets upto about 55A on each cable, granted it gets warm... not hot. and at the limit as to what I find comfortable to use it with. 8AWG is rated for over 70A but that's hot to the touch and would cause thermal expansion/contraction issues if cycled daily.

If your breakers are tripping due to heat at 80A then your terminations may be the issue because 4AWG cable will transfer qute a bit of heat away from the breaker.
If you can't quantify how much they cost, it's a deal, I'll buy 5 of them for 3 lumps of rocking horse ......
Reply


Messages In This Thread
Charge Controller Question - by Wolf - 06-19-2020, 04:36 PM
RE: Charge Controller Question - by Wolf - 06-19-2020, 05:18 PM
RE: Charge Controller Question - by completelycharged - 06-19-2020, 07:03 PM
RE: Charge Controller Question - by Wolf - 06-19-2020, 06:58 PM
RE: Charge Controller Question - by Wolf - 06-19-2020, 10:49 PM
RE: Charge Controller Question - by Wolf - 06-20-2020, 10:36 AM
RE: Charge Controller Question - by Wolf - 06-24-2020, 02:46 PM

Forum Jump:


Users browsing this thread: 1 Guest(s)