William,
Here is what I would recommend. 1. Put pairs of SQ-150s in parallel on an M250. 2. Put PC4JFs as two in series by two in parallel on M250. 3. For leftovers-two PC4JFs in series are the same as one SQ-150 so mix and match to your heart's content. The issue is either getting a paralleling cable for the MC3 connectors or installing J-boxes with cable glands to parallel the sets. This is child's play, but it is fun too. These are just mini PV arrays-no mystery here. You will not overpower the M250 with this arrangement. These modules will have lost 10-20% of their nameplate rating at STC (30% at real power) so no problem with an M250. M215 just does not match well at all. Bill. From: [email protected] [mailto:[email protected]] On Behalf Of William Miller Sent: Thursday, September 26, 2013 10:01 PM To: RE-wrenches Subject: [RE-wrenches] Using legacy modules on micro-inverters Friends: I am trying to upgrade a long time off-grid client to a grid-connected installation. They have a mix of Siemens PC4JF and Shell SQ-150P modules. It is my understanding that putting two of the PC4JFs in series is exactly one SQ-150. I don't have spec sheets for the PC4JFs but I am told they are an SP75. If I use the data for the SP75 and multiply the voltages by two I get exactly a SQ-150P. Anyway, putting two 36 modules together makes one 72 cell module. This would likely work with an Enphase M190 but those are no longer manufactured. Same with the M215. Power One makes a micro that meets the predicted voltage window. I did this a while ago with pairs of SR100s. It worked great. Anyone try this with even older modules, like those cited??? Thanks in advance. William Miller
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