Thanks Tony - yes, that approach makes perfect sense. Unfortunately, this
design ends up with plenty of lower voltage strings paralleled with higher
ones.
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
----- "Antony Tersol" wrote:
> 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 >
> Subject: [RE-wrenches] mix-n-match Unisolar > To: RE-wrenches > Cc: Randy >
> 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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