[RE-wrenches] strings of older solar panels

[Brian Teitelbaum]

Lee,

I also have an old spec sheet for the MSX60/64 that does not state the max system voltage. It does, however, state that it passes a 2700VDC frame/cell isolation test. I don't know if that is the required test for a 600VDC rating or not.

If I remember correctly, they were not sold with bypass diodes installed, so if you do use them in a system above 24V, be sure to add the diodes.

Brian Teitelbaum
AEE Solar



From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Solar Plexus
Sent: Wednesday, November 18, 2009 9:33 AM
To: RE-wrenches at lists.re-wrenches.org
Subject: [RE-wrenches] strings of older solar panels

Hi Wrenches.

            I have a customer with 32 of the Solarex MSX-64 solar panels an a battery-based system.  He wants to go batteryless inverter.  So I am looking at  2 strings of 16 in series.    But the solar panel spec sheet doesn't say anything about system voltage rating.  Can I do this?
             If  one solar panel in the string is shaded, does it see the full string voltage of around 280 volts?  Is there something in the way new panels are made that makes them more able to handle this voltage, or is it just that they are now tested for it?
            My guess is this request may be happenning a fair amount.  Is there a reason these panels are not listed on the California GoSolr website?

Lee Tavenner
Solar Plexus
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