Charge Controllers & Grid-tie Inverters [RE-wrenches]

Peter Parrish peter.parrish at calsolareng.com
Sun Jun 11 14:51:04 PDT 2006


Thanks Darryl for the reply. 

The AES works with low voltage strings.  Currently there are 4 Shell SP-75
("12 volt") modules per string. Vmpp around 60 volts and Impp around 4 A.
And there are four of these four module strings feeding a single AES
inverter.

I have asked the customer for the operation and maintenance manual for the
Geo. Don't have it yet.

- Peter

-----Original Message-----
From: Darryl Thayer [mailto:daryl_solar at yahoo.com] 
Sent: Sunday, June 11, 2006 12:19 PM
To: RE-wrenches at topica.com
Subject: Re: Charge Controllers & Grid-tie Inverters [RE-wrenches]


Hi Peter
As I understand it there is no charge controller that
works at that high an input voltage, the voltage of
your string inverters.  As I understand it the
switching devices generate a lot of heat.  However VFD
variable frequency drives work at those voltages.  

What is the battery voltages of the GEO?
Darryl

--- Peter Parrish <peter.parrish at calsolareng.com>
wrote:

> 
> 
> The same customer that wanted a production meter has
> also indicated an
> interest in having a solar chager for his GEO (sp?)
> electric car. He was
> thinking of a system distinct from the two-inverter,
> grid-tie system he
> already has. Of course, the way he charges the GEO
> is via a AC/DC
> charger, which he appreciates involves a dual
> conversion (DC-AC-DC)
> which wastes power.
>  
> I told him a seperate off grid system would have two
> problems: (1) the
> PV modules would not be eligible for a rebate, (2)
> when the GEO's
> batteries were fully charged he would be not be
> using the availble
> generation capacity of the seperate sytem.
>  
> So I proposed looking into placing a charge
> controller in parallel with
> one of his inverters, and so long as the PV string
> sizing matched the
> inverter input range and charge controller input
> range, we might have a
> solution. The customer would not have to add more PV
> modules and he
> could charge his GEO from his solar resource
> directly. 
>  
> How might the inverter and charge controller work
> together, expecially
> when the PV DC power availble is low or the
> batteries need a healthy
> charge? Could we err on the size of a small charge
> controller, to limit
> contention between the two units?
>  
> Thanks in advance for help on what is admittedly an
> odd-ball request.
>  
> 
> Peter Parrish, Ph.D. President
> NABCEP Certified PV Installer (Cert. No. 031806-26)
> California Solar Engineering, Inc.
> 820 Cynthia Ave.
> Los Angeles, CA 90065
> Office 323-258-8883
> Mobile 323-839-6108
> Fax 323-258-8885
> peter.parrish at calsolareng.com
> www.calsolareng.com 
> 
> 
> [Non-text portions of this message have been
> removed]
> 
> 
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