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Discussion Starter #1
Re: [EVDL] Solar PV

Here's someone's thesis on that idea:

http://solar-guppy.com/forum/download/mppt_thesis_Hannes_knopf.pdf

> How about using an array that has a DC output that matches the DC
> charge voltage voltage of your EV.
> Then you don't have any DC-AC-DC


Think more
Talk less
Become wise

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Registered
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70 Posts
Discussion Starter #2
Re: [EVDL] Solar PV

When you come to the end of section 3.1 you see the
statement:
It is also noted that the values for the maximum power
point Imp and Vmp are in constant proportion to Isc and Voc.

I have for several years used an inverter with built-in
MPPT that used the Voc to estimate the MPP.
What it did was regularly (every few seconds) the inverter
opened the input FET for a few microseconds and estimated
the Voc of the attached solar panels, then it applied the
simple formula of multiplying the Voc with a contant to
get the Vmp.
There was a default value for the constant, but it was
programmable so that different technology panels could be
used with possibly different relation between Voc and Vmp.
This inverter was never "hunting" for the max power point
and you could manually try some different constant values
during a period of constant irradiation as the inverter
also displayed its actual Pin and Pout
(DC input and grid AC output)

I could hear the inverter's MPPT working on an AM radio
as a repeated click from the short pulse on the panels
and wiring, from Vmp to Voc and back.
Main advantages of this solution were its guaranteed
stability (which was not true for the combination of
some hunting algorithms and panel technologies) and
simplicity of implementation.

Regards,

Cor van de Water
Director HW & Systems Architecture Group
Proxim Wireless Corporation http://www.proxim.com
Email: [email protected] Private: http://www.cvandewater.com
Skype: cor_van_de_water IM: [email protected]
Tel: +1 408 383 7626 VoIP: +31 20 3987567 FWD# 25925
Tel: +91 (040)23117400 x203 XoIP: +31877841130

-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of [email protected]
Sent: Thursday, December 23, 2010 10:40 AM
To: [email protected]
Subject: Re: [EVDL] Solar PV

Here's someone's thesis on that idea:

http://solar-guppy.com/forum/download/mppt_thesis_Hannes_knopf.pdf

> How about using an array that has a DC output that matches the DC
> charge voltage voltage of your EV.
> Then you don't have any DC-AC-DC


Think more
Talk less
Become wise

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
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| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
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