If you had, for instance, strings of quantity 10 PVL136 watt modules, and you needed to put in a 68 watt module because of a skylight, then you would want to use a string of 9 PVL136 watt + 2 PVL68 watt. This would keep the voltages the same between strings. Having a string of 9 PVL136 + 1 PVL68 paralleled with strings of 10 PVL136 would cause some of the strings to see non-optimal voltages. I don't see how bypass diodes would fix things.
> Message: 1 > Date: Thu, 30 Oct 2008 13:29:38 -0700 (PDT) > From: Geoff Greenfield <[EMAIL PROTECTED]> > Subject: [RE-wrenches] mix-n-match Unisolar > To: RE-wrenches <re-wrenches@lists.re-wrenches.org> > Cc: Randy <[EMAIL PROTECTED]> > Message-ID: > <[EMAIL PROTECTED]> > Content-Type: text/plain; charset="utf-8" > > > > I thought I knew the answer to this one, but wanted to run it by the list. > > > > We are responding to a bid where the electrical engineer has designed a > system with different sized Uni-solar laminates in some?series strings > paralelled with consistant full size strings.? (this was done to work around > skylights etc). > > > > We suggested that this was a poor design and will lead to "least common > denomenator" performance, exacerbated by MPPT confusion.? The EE responded > that "the bypass diodes allow for this". > > > > Any experience with this in practice? > > > For a brighter energy future, > > Geoff Greenfield > Founder and CEO > Third Sun Solar & Wind Power Ltd. > 340 West State Street, Unit 25 > Athens, OH 45701 > > 740.597.3111 ? ? Fax 740.597.1548 > www.Third-Sun.com > > Clean Energy - Expertly Installed > > >
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