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Search took 0.00 seconds. Search: Posts Made By: cal40john
Forum: Electrical: Batteries, Generators & Solar 04-12-2010, 22:21
Replies: 69
Views: 10,117
Posted By cal40john
I don't understand regulators on both sides. ...

I don't understand regulators on both sides. There's just the one buck converter in the white paper that is linked in my last post (You referenced it also.). The buck converter function is...
Forum: Electrical: Batteries, Generators & Solar 04-12-2010, 17:43
Replies: 69
Views: 10,117
Posted By cal40john
I think you're wrong. In the link below is...

I think you're wrong.

In the link below is a schemetic of the power circuit of an MPPT controller. The panel output basically goes through a low pass filter then to a sync buck regulator to the...
Forum: Electrical: Batteries, Generators & Solar 03-12-2010, 19:42
Replies: 69
Views: 10,117
Posted By cal40john
Maybe I'm reading this wrong but what I get out...

Maybe I'm reading this wrong but what I get out of this is that you're saying the MPPT controller is always trying to find the max output of the solar panel, then if it determines that the battery...
Forum: Electrical: Batteries, Generators & Solar 01-12-2010, 12:10
Replies: 69
Views: 10,117
Posted By cal40john
You're right, but from 7 am to 10 am the output...

You're right, but from 7 am to 10 am the output was 20% down. We're talking about an interesting place that brings the panels up to 170 deg F nice and early in the morning.

John
Forum: Electrical: Batteries, Generators & Solar 01-12-2010, 11:29
Replies: 69
Views: 10,117
Posted By cal40john
Yes I know I-sc will not be used, that is why I...

Yes I know I-sc will not be used, that is why I said look at the I-V curves, again the I at 12 volts is a couple of percent below I-sc, not 20% down. For the panel to output 20% less current than...
Forum: Electrical: Batteries, Generators & Solar 01-12-2010, 06:01
Replies: 69
Views: 10,117
Posted By cal40john
What does the short circuit output tell you? ...

What does the short circuit output tell you? (Right hand column) He didn't get that value by hooking the solar panel to the batteries. Looking at the I-V curves graph I posted, what do you maximize...
Forum: Electrical: Batteries, Generators & Solar 30-11-2010, 13:30
Replies: 69
Views: 10,117
Posted By cal40john
Actually he provides the answer to this, I didn't...

Actually he provides the answer to this, I didn't catch it the first pass. His last column shows an 80 watt panel short circuited. Multiply that number by 3 to give you close to what the 3 panels...
Forum: Electrical: Batteries, Generators & Solar 30-11-2010, 11:31
Replies: 69
Views: 10,117
Posted By cal40john
I didn't see where he talks about the state of...

I didn't see where he talks about the state of charge of the batteries. As stated by another poster on that thread, MPPT only gives you increased performance when the regulator is not limiting...
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