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RegGuheert
Posts: 6178
Joined: Mon Mar 19, 2012 4:12 am
Delivery Date: 16 Mar 2012
Leaf Number: 5926
Location: Northern VA

Re: Solar capacity needed for my Leaf?

Fri Sep 20, 2013 10:36 am

ERG4ALL wrote:I was told by the Enphase people that they intentionally have more panels with smaller inverters because the generation on a daily basis is a bell curve with a flat top.
That is only true if you use a tracker OR the inverter limits the output. Otherwise, the curve looks almost exactly like a bell (no flat top).

Fortunately, the OP will almost never see a flat top with his new array. For that to happen, it has to be quite cold and clear and the sun needs to very close to the boresight of the array. That will likely occur only a handful of times each year. If the roof is very flat, then it likely will never happen.
RegGuheert
2011 Leaf SL Demo vehicle
10K miles: Apr 14, 2013, 20K miles (55.7Ah): Aug 7, 2014, 30K miles (52.0Ah): Dec 30, 2015, 40K miles (49.8Ah): Feb 8, 2017, 50K miles (47.2Ah): Dec 7, 2017.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

Burr
Posts: 33
Joined: Mon Sep 09, 2013 9:35 am
Delivery Date: 07 Dec 2013
Leaf Number: 400968

Re: Solar capacity needed for my Leaf?

Sun Sep 22, 2013 8:14 am

ERG4ALL- Thanks for the info. I never really understood the the " flat part of the curve before". I wounder how that would apply to the newer microinverters that are made for larger solar panels. SMA, Energy One, and Enphase are the only companies I know of that address the need for those solar panels above 255 watts.
One last note SMA has anew line of central inverters that will shift from "grid" to non-grid DC production during a power outage. My older central inverter systems may need replacement some day. These new SMA would be a nice adaptation. Right now, expanding the older array with microinverters for my Leaf is working out fine.........Thanks again.

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drees
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Joined: Fri Apr 23, 2010 3:51 pm
Location: San Diego

Re: Solar capacity needed for my Leaf?

Sun Sep 22, 2013 11:22 am

Burr wrote:ERG4ALL- Thanks for the info. I never really understood the the " flat part of the curve before". I wounder how that would apply to the newer microinverters that are made for larger solar panels. SMA, Energy One, and Enphase are the only companies I know of that address the need for those solar panels above 255 watts.

All PV inverters will clip if you send too much DC power to them. Higher rated inverters simply start clipping at higher power levels.

Burr wrote:One last note SMA has anew line of central inverters that will shift from "grid" to non-grid DC production during a power outage. My older central inverter systems may need replacement some day. These new SMA would be a nice adaptation. Right now, expanding the older array with microinverters for my Leaf is working out fine.........Thanks again.

SMA has had this for a while using their Sunny Island product - the Sunny Island integrates with existing SMA inverters.
'11 LEAF SL Powered By 3.24 kW Enphase Solar PV

DarthPuppy
Posts: 580
Joined: Sun Aug 11, 2013 8:45 pm
Delivery Date: 11 Aug 2013

Re: Solar capacity needed for my Leaf?

Sun Sep 22, 2013 10:26 pm

Oooohhhh! I didn't think one existed like this. I'm intrigued.

Is there any barrier to installing one of these SMA with the SPS functionality in California or with SCE?
'13 Leaf SL
'18 Honda Clarity Touring PHEV

DarthPuppy
Posts: 580
Joined: Sun Aug 11, 2013 8:45 pm
Delivery Date: 11 Aug 2013

Re: Solar capacity needed for my Leaf?

Mon Sep 23, 2013 8:45 pm

Looking at online vendors, it looks like one SMA 3000 with the SPS feature would cost about $100 more than the 10 Enphase M215s for my solar expansion. I'm thinking that would handle the 10 250 W panels and have room to add 2 more down the road. (Am I interpreting this stuff correctly?)

While I like the flexibility of the micro-inverters and the fact that I don't take such a production hit if I get a damaged panel, the SPS feature is very tempting. Being completely without power when the grid is down is really annoying. :cry: I'm thinking that 1500 W through the SPS would be enough to operate the trickle charger that came with the Leaf. :D (Please confirm if I'm correct on that???) So an extended power outage wouldn't force me to switch to an ICE. :idea:

And I see that the SMA inverter is US made. Anyone have these installed and can speak to their quality? So far, I've heard lots of good stuff about the M215s.

Thanks!
'13 Leaf SL
'18 Honda Clarity Touring PHEV

User avatar
RegGuheert
Posts: 6178
Joined: Mon Mar 19, 2012 4:12 am
Delivery Date: 16 Mar 2012
Leaf Number: 5926
Location: Northern VA

Re: Solar capacity needed for my Leaf?

Tue Sep 24, 2013 6:25 am

DarthPuppy wrote:Anyone have these installed and can speak to their quality?
The Sunny Boys are well designed and manufactured. The difference is that you only get a 10-year warranty with them instead of the 25-year warranty with the M215s. That is mainly due to the electrolytic capacitors that the Sunny Boy uses. The good news is that you can pay extra to get a 25-year warranty on the Sunny Boy if you like. By way of anecdotal information, DesertDenizen has stated in my thread on MTBF, failure modes, etc. that his lower-power Sunny Boys have served him without any problems for over 10 years in Arizona. Of course no one has that much history with any Enphase inverters.
RegGuheert
2011 Leaf SL Demo vehicle
10K miles: Apr 14, 2013, 20K miles (55.7Ah): Aug 7, 2014, 30K miles (52.0Ah): Dec 30, 2015, 40K miles (49.8Ah): Feb 8, 2017, 50K miles (47.2Ah): Dec 7, 2017.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

Burr
Posts: 33
Joined: Mon Sep 09, 2013 9:35 am
Delivery Date: 07 Dec 2013
Leaf Number: 400968

Re: Solar capacity needed for my Leaf?

Tue Sep 24, 2013 9:53 am

I have two old SMA's that have been working for about seven years. One installer referred to them as being " bullet proof". At that time they were also called "Sunny Boys", and were made in Germany. As far as adding solar panels' little by little' and DIY, the microinverters will work best for me. The Enphases are 'plug & play'. If you make a few calls, you'll find the warranty process is much more user friendly at Enphase than Power One or SMA.. Two installers said that Enphase was their first choice based on the warranty processes. That SMA back-up feature is really tempting........Good Luck

Burr
Posts: 33
Joined: Mon Sep 09, 2013 9:35 am
Delivery Date: 07 Dec 2013
Leaf Number: 400968

Re: Solar capacity needed for my Leaf?

Tue Sep 24, 2013 9:55 am

I have two old SMA's that have been working for about seven years. One installer referred to them as being " bullet proof". At that time they were also called "Sunny Boys", and were made in Germany. As far as adding solar panels' little by little' and DIY, the microinverters will work best for me. The Enphases are 'plug & play'. If you make a few calls, you'll find the warranty process is much more user friendly at Enphase than Power One or SMA.. Two installers said that Enphase was their first choice based on the warranty processes. That SMA back-up feature is really tempting........Good Luck

DarthPuppy
Posts: 580
Joined: Sun Aug 11, 2013 8:45 pm
Delivery Date: 11 Aug 2013

Re: Solar capacity needed for my Leaf?

Tue Sep 24, 2013 2:27 pm

Thanks for the info. I've revised the bid request to the sma with the sps outlet. I wish I had known about this option a year ago when we did our first solar install if it was available then. But fortunately we can get it this time around.
'13 Leaf SL
'18 Honda Clarity Touring PHEV

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