[RE-wrenches] Dc Power Supply on Microinverter input

[John Berdner]

Mark:

Depends on the supply and the micro.
One or the other has to have isolation or bad things can happen.
Check with the manufacturers to see if the devices are isolated.
You could also use an isolation transformer ahead of the DC supply and be ok.
You might also need to float the ground on the supply (be careful).

Lastly the control loops in the mico and the supply probably won't play well together.
You can end up getting weird oscillations between the control loops in the MPPT and the CV/CI control of the supply.
You might need to add some resistance and typically some inductance between the supply and the inverter to get it to track right.

Best Regards,

John Berdner
General Manager, North America

SolarEdge Technologies, Inc.
3347 Gateway Boulevard, Fremont CA 94538 USA  (*Please note of our new address.)
T: 510.498.3200, X 747
M: 530.277.4894


-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Mark Frye
Sent: Tuesday, January 29, 2013 11:32 AM
To: RE-wrenches
Subject: [RE-wrenches] Dc Power Supply on Microinverter input

Folks,

Anyone have an idea of what would happen if I connected a bench top DC power supply with adjustable voltage and current to the pv inputs of a microinverter that is also connected on the Ac side? Would something bad happen as the inverter tries to run it's mppt on the ps?

Mark Frye
Berkeley Solar Electric Systems

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