A PWM (pulse width modulated) controller will also deal with fluctuations in
the array voltage, its just not so good at it. We use a PWM controller on our
small array mostly due to cost.
-Curt
From: Craig via Mercedes <mercedes@okiebenz.com>
To: Mercedes Discussion List <mercedes@okiebenz.com>
Cc: Craig <diese...@pisquared.net>
Sent: Saturday, July 29, 2017 10:49 PM
Subject: Re: [MBZ] Buy Me, You Rascally Wabbit!
On Sat, 29 Jul 2017 22:42:32 -0400 MG via Mercedes
<mercedes@okiebenz.com> wrote:
> I think there may also be a voltage matching converter for that
> DC feed to the batteries from the solar array. From what I
> remember if I had chosen batteries then there would have been a
> totally different controller to keep the DC at the right voltage
> for the batteries. I think the voltage from the solar array
> changes a little bit as well as the amps depending on the amount
> of sun. May not matter much as long as it's close. I don't know
> enough about that.
You are correct. I did not show that on the diagram, and probably should
have. I have added it to the diagram below.
What you are talking about in relation to the amount of sun is called
maximum power point tracking (MPPT).
Craig
> Craig via Mercedes wrote:
> > On Sat, 29 Jul 2017 19:48:15 -0600 Craig via Mercedes
> > <mercedes@okiebenz.com> wrote:
> >
> > I missed the AC feed for the Standby Battery Charger:
> >
> >
> > |--------| |-----|
> > |grid-tie| |solar|
> > Grid -+-|inverter|-----------------+-----|array|
> > | |--------| | |-----|
> > | |
> > | |
> > | |----+-----|
> > | Grid Sense | DC |
> > |-----------------------|Disconnect|
> > | | Switch |
> > | |----+-----|
| |
| |----------|
| | Solar |
| | Array |
| | Charge |
| |Controller|
| |----+-----|
> > | |-------| | |---------|
> > | |Standby| +-------------|Batteries|
> > +------|Battery|-------------+ |---------|
> > | |Charger| |
> > | |-------| |
> > | |----+-----|
> > | |Standalone|
> > | | Inverter |
> > | |----+-----|
> > | |
> > | |
> > | |--------| |
> > | | AC | |
> > |--------|Transfer|----------|
> > | Switch |
> > |---+----|
> > |
> > |
> > House
> > Loads
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