On module IV curves, 100 w/m2 is the lowest insolation level usually listed. It would also depend on the charge controller or inverter being used. I've seen arrays make power at below 100 w/ m2 if there is enough array to overcome the operating losses of the electronics.

R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760

On 9/5/2013 10:28 AM, Benn At DayStarSolar wrote:
Thank you Kelly.
Not that I don't believe you, but can you provide any data to back this up?
I should have asked for that upfront.

benn
Sent from a 'smart' phone, with touch screen keys. Please excuse shortcuts and typos.

On 2013-09-05, at 10:24 AM, Kelly Larson <[email protected] <mailto:[email protected]>> wrote:

Hi Benn,

It's around 200W per square meter.

Blessings,
Kelly

Kelly Larson
Electrical Engineer
NABCEP Certified Solar PV Installation Professional
ISPQ Master Trainer
CA Electrical Contractor# 868189
SolarKelly.com <http://SolarKelly.com>

On Sep 5, 2013, at 9:06 AM, Benn At DayStarSolar wrote:

Wrenches,
I was asked... What is the minimum Lux level required to make usable electricity with a commonly installed monocrystaline PV module.

The question is for the purpose of designing a tracker that will not operate until a particular threshold is reached.
Thanks,
benn
Sent from a 'smart' phone, with touch screen keys. Please excuse shortcuts and typos.
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