โOct-23-2013 02:34 PM
โNov-01-2013 09:41 AM
โNov-01-2013 09:21 AM
ktmrfs wrote:
BFL
At least I think it was you. Asked about temp effects and what temp panels are referenced to.
well, I just got a 100 W portable panel from solar world. And looked at the panel spec's. Nominal panel temp for rated spec's for Imp and Isc and Vmp is 47C.
Which works out to pretty close to the panel temps I was seeing in my report on MPPT controllers for panel temp at a 70F ambient.
โNov-01-2013 08:09 AM
โOct-31-2013 12:48 PM
โOct-31-2013 11:49 AM
โOct-31-2013 11:12 AM
โOct-31-2013 09:19 AM
BFL13 wrote:
...Yes, I ignored the controller loss for MPPT that would have put PWM ahead. That saves Ken from counter-claiming MPPT works better on every foggy Friday the 13th in November...
โOct-31-2013 09:08 AM
โOct-31-2013 08:00 AM
BFL13 wrote:
13v- 208.3/13 = 16.02a vs 14.68a diff of 1.34a
14v- 208.3/14 = 14.88 vs (230/130 x ๐ 14.15 diff of 0.73a
โOct-31-2013 07:56 AM
BFL13 wrote:
...So I am not getting very excited here about how MPPT will be better than doing it with PWM...
โOct-31-2013 07:47 AM
โOct-31-2013 07:06 AM
โOct-31-2013 05:48 AM
BFL13 wrote:
I have hopes of getting 16.5amps or so when panel is getting full Isc and temp is not so high that it kills the voltage the MPPT needs to feed itself.
โOct-30-2013 03:34 PM
โOct-30-2013 11:37 AM
BFL13 wrote:
Are you saying it is ok to compare two 120s in parallel and PWM with a single 240w and MPPT, but not with two 120s in series and MPPT?