Direct Coupling [RE-wrenches]

[Mark Robinson]

Thanks, Matt

Yes, MPPT gets the most possible power out of the panels... But not all.
In the Nextek example, it seems that power from the grid is added to power
from the panel to the extent that it is needed. That means that all power
generated gets used. An inverter won't even come on until the PV reaches a
certain level. My question is whether this amount is negligible or not. 

Regards,
Mark



-----Original Message-----
From: matthew tritt [mailto:solarone at charter.net] 
Sent: Wednesday, April 16, 2003 11:34 AM
To: RE-wrenches at topica.com
Subject: Re: Direct Coupling [RE-wrenches]


Mark,

Isn't that why the SB series has MPPT? All of the MPPT devices I'm familiar
with do a good job of balancing available light with the lowest acceptable
needs of the device they power. Wouldn't that include lighting loads?

Matt T
----- Original Message -----
From: "Mark Robinson" <Mark at TheEnergyGrid.com>
To: <RE-wrenches at topica.com>
Sent: Wednesday, April 16, 2003 4:29 AM
Subject: Direct Coupling [RE-wrenches]


Thanks, all.

I really appreciate the help and support. The links you've suggested on and
off-list are making a difference. That Nextek product you mentioned seems to
have some legs... commercial solar systems without inverters. Hmmmm.

    In case you don't recognize my name, I spent the last several years  in
customer service at Advanced Energy dealing with inverters that had
problems. People were switching to the AEI product because of Trace
inverters that had problems.

An un-resolved question, though, is whether there is any advantage to
collecting the power that the panel produces before an inverter would
normally come on. Most measures of inverter efficiency don't count this.
They start counting when the panel has enough power to kick on the inverter.
Is it significant? Anyone know if this has been studied?

Regards,
Mark

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