<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr">Or a charger such as Iota, or power max. </div><div dir="ltr"><br></div><div dir="ltr">Jay</div><div dir="ltr">Peltz power. </div><div dir="ltr"><br><blockquote type="cite">On Mar 3, 2020, at 7:24 PM, don@energysolarnow.com wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">\ufeff<span style="font-family:Verdana; color:#000000; font-size:10pt;"><div>You wrote that you would connect the Exeltech to just one of the service phases. </div><div>But most GT inverters are 240 and require both phases. Is yours different? You did not mention which model it is. </div><div>Also, as Kent Osterberg mentioned, the Exeltech will not charge its batteries from the AC output. </div><div>Your scheme with the PLC controlling an SCR leaves unaddressed how any charge current gets directed into the batteries to allegedly raise their voltage. Is there a charger somewhere in this scheme?<br></div><div>You still need some way to charge batteries from solar. How about connecting a charge controller to some of the solar panels?</div><div><br></div><div>Don Barch</div><div>Energy Solar<br></div>
<blockquote id="replyBlockquote" webmail="1" style="border-left: 2px solid blue; margin-left: 8px; padding-left: 8px; font-size:10pt; color:black; font-family:verdana;">
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-------- Original Message --------<br>
Subject: RE-wrenches Digest, Vol 13, Issue 59<br>
From: <a href="mailto:re-wrenches-request@lists.re-wrenches.org">re-wrenches-request@lists.re-wrenches.org</a><br>
Date: Sun, March 01, 2020 2:19 pm<br>
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Today's Topics:<br>
<br>
1. OK, so what iwould happen if I do this... (Mark Frye)<br>
2. Re: OK, so what iwould happen if I do this... (frenergy)<br>
3. Re: OK, so what iwould happen if I do this... (Kent Osterberg)<br>
4. Re: OK, so what iwould happen if I do this... (Jerry Shafer)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Sat, 29 Feb 2020 15:27:32 -0800<br>
From: Mark Frye <<a href="mailto:markf@berkeleysolar.com">markf@berkeleysolar.com</a>><br>
To: RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>><br>
Subject: [RE-wrenches] OK, so what iwould happen if I do this...<br>
Message-ID: <<a href="mailto:93731c38-40b5-7c63-1d74-a879fbdd9d74@berkeleysolar.com">93731c38-40b5-7c63-1d74-a879fbdd9d74@berkeleysolar.com</a>><br>
Content-Type: text/plain; charset=utf-8; format=flowed<br>
<br>
I have 2kw of grid tied PV on my house.<br>
<br>
Suppose I:<br>
<br>
- Open the main breaker to disconnect from the grid<br>
<br>
- I open the PV breaker<br>
<br>
- I connect a small good quality inverter like an Exeltech XP 500 to one <br>
of the phases of the service (120 VAC)<br>
<br>
- I put a small battery pack, 100 AH at 24 VDC on the inverter<br>
<br>
OK so far, I could run some small loads for a relatively short period of <br>
time before the batteries get low<br>
<br>
-I have a PLC with an AD input and DA output. On the input I measure the <br>
battery voltage, on the output I control a SCR. The SCR controls a 2kw <br>
immersion heater sitting in a big bucket of water. The PLC has a scan <br>
time of 2 mS and I program it to increase the duty cycle of the SCR as <br>
voltage of the battery rises above 24 VDC.<br>
<br>
OK so far nothing has really changed from above.<br>
<br>
- I close the PV breaker, the GT inverters see the battery inverter, <br>
sync and connect after five minutes.<br>
<br>
Voila, I can run house loads from 0 to 2kw with my existing GT PV with <br>
the balance of energy dumped as needed to the immersion heater.<br>
<br>
Right?<br>
<br>
Mark Frye<br>
<br>
<br>
<br>
------------------------------<br>
<br>
Message: 2<br>
Date: Sun, 1 Mar 2020 06:26:27 -0800<br>
From: frenergy <<a href="mailto:frenergy@psln.com">frenergy@psln.com</a>><br>
To: <a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a><br>
Subject: Re: [RE-wrenches] OK, so what iwould happen if I do this...<br>
Message-ID: <<a href="mailto:c97234cd-4441-34d7-740c-51f07837b081@psln.com">c97234cd-4441-34d7-740c-51f07837b081@psln.com</a>><br>
Content-Type: text/plain; charset=utf-8; format=flowed<br>
<br>
Mark,<br>
<br>
??? ??? ??? OR, you change-out your inverter to an SMA with Secure <br>
Power Supply and during grid power outage, while there is some sun on <br>
the panels, you would have up to 2KW of 120VAC power on the SPS circuit <br>
by just flipping a switch. We usually install a 4X outdoor box with a <br>
120 VAC outlet ganged with a switch right under the inverter and let the <br>
customer run the power to the : frig, lights, battery charger, TV or <br>
whatever during an outage, though some romex could be run to close to <br>
the frig.<br>
<br>
Bill<br>
<br>
Feather River Solar Electric<br>
Bill Battagin, Owner<br>
4291 Nelson St.<br>
Taylorsville, CA 95983<br>
530.284.7849<br>
CA Lic 874049<br>
<a href="http://www.frenergy.net">www.frenergy.net</a><br>
<br>
On 2/29/2020 3:27 PM, Mark Frye wrote:<br>
> I have 2kw of grid tied PV on my house.<br>
><br>
> Suppose I:<br>
><br>
> - Open the main breaker to disconnect from the grid<br>
><br>
> - I open the PV breaker<br>
><br>
> - I connect a small good quality inverter like an Exeltech XP 500 to <br>
> one of the phases of the service (120 VAC)<br>
><br>
> - I put a small battery pack, 100 AH at 24 VDC on the inverter<br>
><br>
> OK so far, I could run some small loads for a relatively short period <br>
> of time before the batteries get low<br>
><br>
> -I have a PLC with an AD input and DA output. On the input I measure <br>
> the battery voltage, on the output I control a SCR. The SCR controls a <br>
> 2kw immersion heater sitting in a big bucket of water. The PLC has a <br>
> scan time of 2 mS and I program it to increase the duty cycle of the <br>
> SCR as voltage of the battery rises above 24 VDC.<br>
><br>
> OK so far nothing has really changed from above.<br>
><br>
> - I close the PV breaker, the GT inverters see the battery inverter, <br>
> sync and connect after five minutes.<br>
><br>
> Voila, I can run house loads from 0 to 2kw with my existing GT PV with <br>
> the balance of energy dumped as needed to the immersion heater.<br>
><br>
> Right?<br>
><br>
> Mark Frye<br>
><br>
> _______________________________________________<br>
> List sponsored by Redwood Alliance<br>
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Message: 3<br>
Date: Sun, 1 Mar 2020 08:58:45 -0800<br>
From: Kent Osterberg <<a href="mailto:kent@coveoregon.com">kent@coveoregon.com</a>><br>
To: <a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a><br>
Subject: Re: [RE-wrenches] OK, so what iwould happen if I do this...<br>
Message-ID: <<a href="mailto:9e32901e-c5d4-ff70-9c44-406cc6d48d50@coveoregon.com">9e32901e-c5d4-ff70-9c44-406cc6d48d50@coveoregon.com</a>><br>
Content-Type: text/plain; charset=utf-8; format=flowed<br>
<br>
Mark,<br>
<br>
I believe that your plan would fail because you are forcing power to <br>
flow through the XP inverter backwards to charge the batteries. I don't <br>
believe the XP inverter can do that. The grid tied inverter would <br>
probably connect then immediately shut down, or connect and immediately <br>
ruin the XP inverter. It would work if you had a inverter with a <br>
bidirectional architecture like a Magnum, Outback, or Schneider <br>
inverter. But even then you'd have a hazardous situation because the <br>
cooling water is going to evaporate.<br>
<br>
Kent Osterberg<br>
Blue Mountain Solar<br>
<br>
<br>
On 2/29/2020 3:27 PM, Mark Frye wrote:<br>
> I have 2kw of grid tied PV on my house.<br>
><br>
> Suppose I:<br>
><br>
> - Open the main breaker to disconnect from the grid<br>
><br>
> - I open the PV breaker<br>
><br>
> - I connect a small good quality inverter like an Exeltech XP 500 to <br>
> one of the phases of the service (120 VAC)<br>
><br>
> - I put a small battery pack, 100 AH at 24 VDC on the inverter<br>
><br>
> OK so far, I could run some small loads for a relatively short period <br>
> of time before the batteries get low<br>
><br>
> -I have a PLC with an AD input and DA output. On the input I measure <br>
> the battery voltage, on the output I control a SCR. The SCR controls a <br>
> 2kw immersion heater sitting in a big bucket of water. The PLC has a <br>
> scan time of 2 mS and I program it to increase the duty cycle of the <br>
> SCR as voltage of the battery rises above 24 VDC.<br>
><br>
> OK so far nothing has really changed from above.<br>
><br>
> - I close the PV breaker, the GT inverters see the battery inverter, <br>
> sync and connect after five minutes.<br>
><br>
> Voila, I can run house loads from 0 to 2kw with my existing GT PV with <br>
> the balance of energy dumped as needed to the immersion heater.<br>
><br>
> Right?<br>
><br>
> Mark Frye<br>
><br>
> _______________________________________________<br>
> List sponsored by Redwood Alliance<br>
><br>
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------------------------------<br>
<br>
Message: 4<br>
Date: Sun, 1 Mar 2020 07:31:36 -1000<br>
From: Jerry Shafer <<a href="mailto:jerrysgarage01@gmail.com">jerrysgarage01@gmail.com</a>><br>
To: RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>><br>
Subject: Re: [RE-wrenches] OK, so what iwould happen if I do this...<br>
Message-ID:<br>
<<a href="mailto:CAMUFgmVYBnMmzgE__tjDS9xpFsOU59jdf3wwSkFhjw291VGH0g@mail.gmail.com">CAMUFgmVYBnMmzgE__tjDS9xpFsOU59jdf3wwSkFhjw291VGH0g@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Mark<br>
What you are saying is to AC couple but most likely this would fail as your<br>
battery fills not enough loads HBCO or to much loads and your battery does<br>
a LBCO, either way you would be better off spending the money in a maybe a<br>
Outback Skybox easy install and is high voltage PV input and even a small<br>
48 volt bank but think about storage<br>
Jerry<br>
<br>
On Sat, Feb 29, 2020 at 1:27 PM Mark Frye <<a href="mailto:markf@berkeleysolar.com">markf@berkeleysolar.com</a>> wrote:<br>
<br>
> I have 2kw of grid tied PV on my house.<br>
><br>
> Suppose I:<br>
><br>
> - Open the main breaker to disconnect from the grid<br>
><br>
> - I open the PV breaker<br>
><br>
> - I connect a small good quality inverter like an Exeltech XP 500 to one<br>
> of the phases of the service (120 VAC)<br>
><br>
> - I put a small battery pack, 100 AH at 24 VDC on the inverter<br>
><br>
> OK so far, I could run some small loads for a relatively short period of<br>
> time before the batteries get low<br>
><br>
> -I have a PLC with an AD input and DA output. On the input I measure the<br>
> battery voltage, on the output I control a SCR. The SCR controls a 2kw<br>
> immersion heater sitting in a big bucket of water. The PLC has a scan<br>
> time of 2 mS and I program it to increase the duty cycle of the SCR as<br>
> voltage of the battery rises above 24 VDC.<br>
><br>
> OK so far nothing has really changed from above.<br>
><br>
> - I close the PV breaker, the GT inverters see the battery inverter,<br>
> sync and connect after five minutes.<br>
><br>
> Voila, I can run house loads from 0 to 2kw with my existing GT PV with<br>
> the balance of energy dumped as needed to the immersion heater.<br>
><br>
> Right?<br>
><br>
> Mark Frye<br>
><br>
> _______________________________________________<br>
> List sponsored by Redwood Alliance<br>
><br>
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</blockquote></span>
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