[RE-wrenches] Tesla Powerwall

Thu Feb 4 11:02:14 EST 2021

Jon – if you are installing in PG&E territory, the Sunny Boys (with CA Rule 21 settings enabled) will have freq-watt enabled, so they will reduce power linearly when the PW begins to increase frequency in backup mode as well.

As Jerry mentioned, this has been a required function that must be enabled in all grid interactive PV inverters in the IOU territories of CA for a couple years now, so not unique to the Sunny Boy.  Not sure how the PW moves frequency, but Rule 21 inverters will be at 0 power at least by slightly above 62Hz.  The ramp is percentage of nameplate not actual production when ramp starts, so can be at zero production at lower frequency.

PG&Es required freq-watt: “When system frequency exceeds 60.036 Hz, the active power output produced by the Smart Inverter shall be reduced by 50% of real power nameplate rating per hertz (5% of real power nameplate rating reduction per 0.1 hertz)”
Page 196 of   https://www.pge.com/tariffs/assets/pdf/tariffbook/ELEC_RULES_21.pdf

The Sunny Boy put into Offgrid mode has a linear power ramp of 100%/Hz starting at 61 Hz, so will be at zero by 62Hz as well.  This freq-watt is how the Sunny Island has been intelligently throttling Sunny Boys for many years.

Best –
Mike

From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> On Behalf Of August Goers
Sent: Thursday, February 4, 2021 8:26 AM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Subject: Re: [RE-wrenches] Tesla Powerwall

Hi Darryl -

Yea, you have a good point. We have recently used the SMA freq/watt curtailment feature on a bigger off grid system with SMA Tripower inverters and a Tesla Powerpack. We programmed a curve into the SMA inverters so that the Powerpack can throttle SMA PV production on a smooth curve, rather than just binary on/off. We've done this with Sunny Island based systems too. I don't know about the ability of the Powerwall to do this. It's a good question. It gets tricky trying to meet the utility-approved grid tied settings while optimizing offgrid settings, especially when AC coupling different inverter manufacturers. So, we've been leaving all of our Powerwall and PV systems in the normal ongrid mode. The only real downside is that when the grid is down, and PV is producing more than the battery needs, it will just turn off, wait, and then back on over and over, rather than throttle. It is nice to have it just throttle, but not really a big deal for most applications that are primarily grid tied. I have to think manufacturers are thinking about getting that freq/watt curtailment to work across different AC coupled applications. That would be cool. That is a potential benefit of a all-one-manufacturer AC-coupled solution such as Enphase's Encharge or SunPower's new SunVault system. However, I don't know they're implementing that feature either, yet.

August

On Thu, Feb 4, 2021 at 3:59 AM Darryl Thayer <darylsolar1 at gmail.com<mailto:darylsolar1 at gmail.com>> wrote:
Here is my two cents worth.  the PW is "grid following" and so is the sunny boy when the grid is up.  When the grid fails the PW becomes grid forming, bi-directional, inverter charger with frequency shift to control charging.  The newer SBs will accept frequency shifts and be controlled.  So yes it should work, but I have not tried this, and someone with experience should answer.

On Thu, Feb 4, 2021 at 1:19 AM Jerry Shafer <jerrysgarage01 at gmail.com<mailto:jerrysgarage01 at gmail.com>> wrote:
Mr Hill
The PW is AC coupled so any inverter but the newer the better with Freq shift capable may take programming to work best.
Jerry

On Mon, Feb 1, 2021, 10:03 AM Jonathan Hill <solarjon at gmail.com<mailto:solarjon at gmail.com>> wrote:
So it can be used with a Sunnyboy, correct? Have you ever installed one?
Jon Hill
Solar design engineer
530-559-3781
solarjon at gmail.com<mailto:solarjon at gmail.com>

On Jan 31, 2021, at 4:11 PM, Jerry Shafer <jerrysgarage01 at gmail.com<mailto:jerrysgarage01 at gmail.com>> wrote:

Tesla is ac coupled  you need the tesla transfer switch and a sub panel, everything into and out of that. But its AC coupled so there is that too.
Jerry

On Sun, Jan 31, 2021, 3:18 PM Jonathan Hill <solarjon at gmail.com<mailto:solarjon at gmail.com>> wrote:
Anyone have experience combining some Tesla Powerwalls with Sunnyboy inverters ro other string inverters?
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