Generator backup

Dual Input, 120/240, stainless steel form factor design for unsurpassed surge capability
Meaford
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Generator backup

Post by Meaford » Sat Feb 01, 2020 5:54 am

My installation is somewhat remote and currently the solar panels are fully covered with snow. When the grid goes down and the solar panels do not produce, the load is fed by the batteries. The question is if the generator can recharge the batteries when they reach a certain level while the system is grid tied.

In other words, can the generator back up the batteries, which in turn back up the solar panels, which in turn back up the grid. If so, what would the settings be.

Thank you.

clarkef
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Midnite Combiners, SPDs
MilSurp MEP-802A ‘5K’ Generator
Location: South Central KY

Re: Generator backup

Post by clarkef » Thu Feb 06, 2020 7:58 pm

Meaford wrote:
Sat Feb 01, 2020 5:54 am
When the grid goes down and the solar panels do not produce, the load is fed by the batteries. The question is if the generator can recharge the batteries when they reach a certain level while the system is grid tied.

In other words, can the generator back up the batteries, which in turn back up the solar panels, which in turn back up the grid. If so, what would the settings be.
The Radian has two AC inputs: Grid and Generator (50A AC breakers). The default choice for charging from AC is Grid. If Grid is not available, and 240V AC is present on the generator input, and the Inverter Charger Operating Mode is "on" then your Radian will charge from AC if the battery voltages meet the criteria set in the battery charging menu. You can also leave the charger mode off and manually enable AC charging if an AC source is present (grid or generator). Priority by default is given to grid, then generator - this is configurable.

See my settings below (I'm off-grid, so no Grid in and inverter charging is enabled. Pretty much as soon as I power up the generator, the inverter see's AC in - check my charge parameters and starting charging.

You would choose settings that are appropriate for YOUR batteries and situation. (my values are quite different from most people).
Attachments
Radian Battery Charging Settings.jpg

Meaford
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Posts: 24
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My RE system: 41 265w solar panels, 2 FM80-150 VDC Charge controllers, 1 Radian 8048 inverter, 1 Radian 4048 inverter, Mate3

Re: Generator backup

Post by Meaford » Fri Feb 07, 2020 4:03 am

Thank you Clarkef, I will give it a try.

clarkef
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Posts: 76
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My RE system: Radian 8048A w/PV GSLC
FM100 CC x3
10KW of 72 cell panels (5S3P x2)
1600AH (usable) of Li-Ion modules @48v with SIMP-BMS
Midnite Combiners, SPDs
MilSurp MEP-802A ‘5K’ Generator
Location: South Central KY

Re: Generator backup

Post by clarkef » Fri Feb 07, 2020 4:45 am

You are welcome. I assumed you had thr GSLC with the associated AC breakers, if your load center is different I can help you around that.

Generator needs to be 240V AC w/neutral and of sufficient size (I use a 5KW and have to use the generator input limits and or charger limits to reduce the charger output to fit). What kind of generator do you have? How is it connected today?

Swampdog
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SOLAREDGE SE6000A-US
Briggs & Stratton Elite 5500w generator (8,500 surge; manual connect)

Re: Generator backup

Post by Swampdog » Mon Feb 10, 2020 10:44 am

Scenario: Grid outage. I connected and ran the generator to bolster array charging for overnight loads. Upon connection, I received the following alerts via OpticsRE continuously for the several hours I ran the generator examples):

AC CURRENT TOO HIGH:
18:13: Inverter on port 1, AC Input current exceeded configured range. AC Input current 16 AAC.
18:14: Inverter on port 1, AC Input current returned to within configured range. AC Input current 3 AAC.

18:17: Inverter on port 1, AC Input current exceeded configured range. AC Input current 16 AAC.
18:22: Inverter on port 1, AC Input current returned to within configured range. AC Input current 5 AAC.

AC INPUT VOLTAGE TO LOW:
18:31: Inverter on port 1 has detected AC Input Voltage is Too Low condition. Measured AC Input Voltage 212VAC.
18:41: Inverter on port 1 Low AC Input Voltage warning has cleared. Inverter AC Input Voltage 219VAC.

18:41: Inverter on port 1 has detected AC Input Voltage is Too Low condition. Measured AC Input Voltage 215VAC.
18:41: Inverter on port 1 Low AC Input Voltage warning has cleared. Inverter AC Input Voltage 219VAC.

Also, with the generator still charging, OpticsRE cited my battery voltage as "high" at 58.1vdc (97%; graph line red). At that point, I disconnected the generator.

My questions:
1) Are the AC Input and AC voltage alerts problematic, and if so, what settings would resolve these issues?

2) Is the high battery voltage reported a serious issue and is there not a disconnect to avoid that? Do I need to change some settings?

Thanks for any input!

S/D

raysun
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My RE system: Flexpower One: FX3048T, (2) FM80, MATE3s, FlexNetDC
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Suniva 330 watt panels (12 - 6 strings of 2 in series)
Hyundai 355 watt panels (6 - 3 strings of 2 in series)
Honda EU7000is gas fuel generator

Re: Generator backup

Post by raysun » Mon Feb 10, 2020 11:15 am

Swampdog wrote:
Mon Feb 10, 2020 10:44 am
Scenario: Grid outage. I connected and ran the generator to bolster array charging for overnight loads. Upon connection, I received the following alerts via OpticsRE continuously for the several hours I ran the generator examples):

AC CURRENT TOO HIGH:
18:13: Inverter on port 1, AC Input current exceeded configured range. AC Input current 16 AAC.
18:14: Inverter on port 1, AC Input current returned to within configured range. AC Input current 3 AAC.

18:17: Inverter on port 1, AC Input current exceeded configured range. AC Input current 16 AAC.
18:22: Inverter on port 1, AC Input current returned to within configured range. AC Input current 5 AAC.

AC INPUT VOLTAGE TO LOW:
18:31: Inverter on port 1 has detected AC Input Voltage is Too Low condition. Measured AC Input Voltage 212VAC.
18:41: Inverter on port 1 Low AC Input Voltage warning has cleared. Inverter AC Input Voltage 219VAC.

18:41: Inverter on port 1 has detected AC Input Voltage is Too Low condition. Measured AC Input Voltage 215VAC.
18:41: Inverter on port 1 Low AC Input Voltage warning has cleared. Inverter AC Input Voltage 219VAC.

Also, with the generator still charging, OpticsRE cited my battery voltage as "high" at 58.1vdc (97%; graph line red). At that point, I disconnected the generator.

My questions:
1) Are the AC Input and AC voltage alerts problematic, and if so, what settings would resolve these issues?

2) Is the high battery voltage reported a serious issue and is there not a disconnect to avoid that? Do I need to change some settings?

Thanks for any input!

S/D
I'm not Radian expert by any means, but IIRC, there are two AC IN ports (Grid and Generator perhaps), and presumably two profiles setting the AC IN current and voltage limits. What are the settings in the profiles? Anything odd there?

Swampdog
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Outback Radian 8048a
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Outback FlexNet DC
SOLAREDGE SE6000A-US
Briggs & Stratton Elite 5500w generator (8,500 surge; manual connect)

Re: Generator backup

Post by Swampdog » Mon Feb 10, 2020 11:40 am

I am thinking you are referring to the AC Input settings for my Radian 8040A inverter:
GS80481 AC Input.JPG


I see that the Grid Input AC Limit is 50AAC while the Generator Input Limit is only 12.5AAC. That is the most significant difference. Upper Voltage Limits and Connect Delays are only slightly different.

Any clues there?

S/D

raysun
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Hyundai 355 watt panels (6 - 3 strings of 2 in series)
Honda EU7000is gas fuel generator

Re: Generator backup

Post by raysun » Mon Feb 10, 2020 12:41 pm

One thing that at once piques my curiosity and displays my ignorance: the errors refer to 220V limits (and I guess attendant current limits) but the AC IN parameters look as if they are for the Radian in 110V mode.

Is there any credence to that?

Also, the generator should be able to handle charging and house load demands concurrently for the smoothest operation. I know the Radian has Support mode which will draw from the battery when the generator is overtaxed, but I don't know the parameters needed to make the inverter operate smoothly in that mode.

Swampdog
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Outback Radian 8048a
Outback MATE3s
Outback HUB
Outback FlexNet DC
SOLAREDGE SE6000A-US
Briggs & Stratton Elite 5500w generator (8,500 surge; manual connect)

Re: Generator backup

Post by Swampdog » Mon Feb 10, 2020 12:53 pm

I am no electrician, only a homeowner trying to get my system functioning as it should and as I need. My installer has refused help, as my Outback system is out-of-warranty.

I only see that the Radian AC Output is set for 240 AC (default). Any other setting I should be looking at?
GS80481 AC Output.JPG
S/D

raysun
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Suniva 330 watt panels (12 - 6 strings of 2 in series)
Hyundai 355 watt panels (6 - 3 strings of 2 in series)
Honda EU7000is gas fuel generator

Re: Generator backup

Post by raysun » Mon Feb 10, 2020 1:06 pm

Again, this is the blind leading the blind, but I'd think a 220V AC OUT mode would require (or at least prefer) a 220V AC IN. 220V service is essentially configured as two 110V legs - L1 and L2 - connected to a common neutral. This is usually referred to a 220V split phase.

The Radians are capable of both 110V and 220V operation, so I'd guess there's a spot to configure that. I don't know where that spot is. I'd imagine the setup guide walks through the process.

Swampdog
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Outback Radian 8048a
Outback MATE3s
Outback HUB
Outback FlexNet DC
SOLAREDGE SE6000A-US
Briggs & Stratton Elite 5500w generator (8,500 surge; manual connect)

Re: Generator backup

Post by Swampdog » Mon Feb 10, 2020 1:46 pm

Well... I don't even qualify even as electricalese for a second language, but I do have L1 and L2 breakers. Unless an Outback engineer wants to chime in and help us out, I will peruse the Radian manuals and see what I can find. Another issue if I can understand it.

So, you are thinking this might be a source of my low and high alert issues?

Thanks much for you assistance!

S/D

raysun
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My RE system: Flexpower One: FX3048T, (2) FM80, MATE3s, FlexNetDC
Outback 200NC batteries (8 @ 48v)
Outback IBR3 battery enclosure
Suniva 330 watt panels (12 - 6 strings of 2 in series)
Hyundai 355 watt panels (6 - 3 strings of 2 in series)
Honda EU7000is gas fuel generator

Re: Generator backup

Post by raysun » Mon Feb 10, 2020 2:00 pm

Swampdog wrote:
Mon Feb 10, 2020 1:46 pm
Well... I don't even qualify even as electricalese for a second language, but I do have L1 and L2 breakers. Unless an Outback engineer wants to chime in and help us out, I will peruse the Radian manuals and see what I can find. Another issue if I can understand it.

So, you are thinking this might be a source of my low and high alert issues?

Thanks much for you assistance!

S/D
The errors look so inconsistent, and frankly whack, to me. I'd suspect configuration before anything else.

It may well be looking in the wrong direction, but it's an easy direction to confirm by a walk through the install guide.

Swampdog
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Posts: 109
Joined: Tue Feb 19, 2019 4:23 pm
My RE system: 7.0 kw system
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Outback GS load center GSLC175-PV-120/240
Outback Radian 8048a
Outback MATE3s
Outback HUB
Outback FlexNet DC
SOLAREDGE SE6000A-US
Briggs & Stratton Elite 5500w generator (8,500 surge; manual connect)

Re: Generator backup

Post by Swampdog » Mon Feb 10, 2020 3:15 pm

Looking through the default settings and ranges, I found the following inconsistencies:

Radian GS8048A:
1) Charger AC Limit: Default is 30AAC, but my setting is at 7.5AAC
2) Gen AC Input: Default is 50AAC, but my setting is 12.5 AAC
3) AC Output: Manual default states 120VAC, but the Radian device menu in Optics lists the default as 240VAC. My setting is 240VAC.

Also, my batteries fully charged via my array, while also selling, but currently at 98%/59.4V (graph red line) with a high of 60.1V. Until this last outage, I have never seen this before (high voltage from array).

I am slightly losing my mind over trying to get this system to work smoothly.

Thanks,

S/D

clarkef
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Posts: 76
Joined: Wed Oct 31, 2018 9:43 am
My RE system: Radian 8048A w/PV GSLC
FM100 CC x3
10KW of 72 cell panels (5S3P x2)
1600AH (usable) of Li-Ion modules @48v with SIMP-BMS
Midnite Combiners, SPDs
MilSurp MEP-802A ‘5K’ Generator
Location: South Central KY

Re: Generator backup

Post by clarkef » Mon Feb 10, 2020 3:25 pm

Raysun,
What size generator have you installed/connected? Make/model? How is it wired in? Are you using a GSLC?

FYI My generator setting are also in the 120VAC range, instead of the expected 240V range. I don’t think that’s an issue. I just treat is as min/max per leg.

I would lower your input voltage since it seems your generator might be sagging a bit under load? Do have a volt meter you can check in the AC voltage at the L1/L2 breaker, both across both hots and from each hot to neutral while the generator is charging?

The Gen AC limit should be set to the continuous rated output amps of your generator. That will prevent the Radian from trying to pull out more power than the generator can support.

Your charger AC limits seem low. Is there a reason you are throttling the charger to 7.5A or 1800w? If you set that to your generator limit, the Radian will put as much to the batteries as it can less loads.

It looks like something might be trying to draw 16A out of your generator, but your settings told the Radian to throttle at 12.5A.

Let’s figure out the right settings for your generator, check input voltages under load, and we can get you setup right.

clarkef
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Posts: 76
Joined: Wed Oct 31, 2018 9:43 am
My RE system: Radian 8048A w/PV GSLC
FM100 CC x3
10KW of 72 cell panels (5S3P x2)
1600AH (usable) of Li-Ion modules @48v with SIMP-BMS
Midnite Combiners, SPDs
MilSurp MEP-802A ‘5K’ Generator
Location: South Central KY

Re: Generator backup

Post by clarkef » Mon Feb 10, 2020 3:27 pm

Swampdog wrote:
Mon Feb 10, 2020 10:44 am
Also, with the generator still charging, OpticsRE cited my battery voltage as "high" at 58.1vdc (97%; graph line red). At that point, I disconnected the generator
What are your Radian battery charging settings? How are they different from your solar charging settings?

raysun
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Posts: 1663
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower One: FX3048T, (2) FM80, MATE3s, FlexNetDC
Outback 200NC batteries (8 @ 48v)
Outback IBR3 battery enclosure
Suniva 330 watt panels (12 - 6 strings of 2 in series)
Hyundai 355 watt panels (6 - 3 strings of 2 in series)
Honda EU7000is gas fuel generator

Re: Generator backup

Post by raysun » Mon Feb 10, 2020 3:41 pm

Swampdog wrote:
Mon Feb 10, 2020 3:15 pm
Looking through the default settings and ranges, I found the following inconsistencies:

Radian GS8048A:

1) Charger AC Limit: Default is 30AAC, but my setting is at 7.5AAC
2) Gen AC Input: Default is 50AAC, but my setting is 12.5 AAC
3) AC Output: Manual default states 120VAC, but the Radian device menu in Optics lists the default as 240VAC. My setting is 240VAC.
Also, my batteries fully charged via my array, while also selling, but currently at 98%/59.4V (graph red line) with a high of 60.1V. Until this last outage, I have never seen this before (high voltage from array).

I am slightly losing my mind over trying to get this system to work smoothly.

Thanks,

S/D
OK. Do you know how to eat an elephant? One bite at a time.

1) Charger AC Limit: Default is 30AAC, but my setting is at 7.5AAC

This setting is the maximum the inverter will allocate for battery charging. It is the input side to the charger (from the generator), not the output side (to the battery).

I'm guessing the maximum charging current the 3 battery banks would accept is around 150A. The maximum input from the generator would be roughly 40AAC, way more than you have, so a lower input setting is in order.

Since the generator needs to supply house loads and battery charging when it's running, the amount set aside for charging depends on how much the loads will be consuming at the same time. I'd split it 50/50, so make the Charger AC IN Limit 10AAC. (See below for generator output.)


2) Gen AC Input: Default is 50AAC, but my setting is 12.5 AAC

This should be set to the maximum rated continuous AC Amps from your generator at 220V. 50AAC implies a continuous rating of 240V x 50A > 11000W or 11kW.

Your generator is rated at 20.8A continuous. The Gen AC INPUT should be set at 20A.

3) AC Output: Manual default states 120VAC, but the Radian device menu in Optics lists the default as 240VAC. My setting is 240VAC.

This is the one that puzzles me. 240VAC would be the right choice, but the config screen shown earlier (from OpticsRE) shows parameters for 120VAC.

I'd go look on the MATE to confirm the settings.
Last edited by raysun on Mon Feb 10, 2020 3:47 pm, edited 2 times in total.

raysun
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Posts: 1663
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower One: FX3048T, (2) FM80, MATE3s, FlexNetDC
Outback 200NC batteries (8 @ 48v)
Outback IBR3 battery enclosure
Suniva 330 watt panels (12 - 6 strings of 2 in series)
Hyundai 355 watt panels (6 - 3 strings of 2 in series)
Honda EU7000is gas fuel generator

Re: Generator backup

Post by raysun » Mon Feb 10, 2020 3:43 pm

clarkef wrote:
Mon Feb 10, 2020 3:27 pm
Swampdog wrote:
Mon Feb 10, 2020 10:44 am
Also, with the generator still charging, OpticsRE cited my battery voltage as "high" at 58.1vdc (97%; graph line red). At that point, I disconnected the generator
What are your Radian battery charging settings? How are they different from your solar charging settings?
Good point. Using OpticsRE get a screen capture of Battery Charging from both the Radian and the Charge Controller, and post.

Swampdog
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Posts: 109
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My RE system: 7.0 kw system
25 x Solarworld SW280 w/SolarEdge Power Optimizers
12 x 220 GH Energycell
Outback GS load center GSLC175-PV-120/240
Outback Radian 8048a
Outback MATE3s
Outback HUB
Outback FlexNet DC
SOLAREDGE SE6000A-US
Briggs & Stratton Elite 5500w generator (8,500 surge; manual connect)

Re: Generator backup

Post by Swampdog » Mon Feb 10, 2020 4:00 pm

I think you are responding to me, Swampdog (S/D)? Or maybe both of us? I will attempt to answer your questions, in case it is me. Note that my system profile is listed.

I have a Briggs & Stratton Elite (030209) 5500W gas generator, manual connect. Can't tell how how it is wired in, but it connects via the solar dedicated panel. Note that I

I have a GSLC.

I have a volt-meter and can check the AC voltage at the L1/L2 breakers.

Input voltage: you are referring to the "Gen Input Voltage" in the GS8048A>AC Input>Gen setting? The default is cited as 50AAC, but my setting is already at 12.5AAC. If this is incorrect, please clarify.

Charger AC Limit: Default is 30AAC, but my setting is at 7.5AAC. I did not enter this setting, so no idea why it is not at the default.

I don't understand your reference to "16A from generator throttled by Radian to 12.5A".

Yes, please... I am extremely anxious to have this system, installed in 2016, work smoothly and reliably.

Your post about Radian battery charging settings: refer to image
Difference from solar settings? I assume you mean my GTO inverter? If you can be specific, I can try to get those figures from the digital panel on the inverter. Not available via my monitoring software and generally, SolarEdge only wants to work with installers. One of my challenges is that OpticsRE does not report on array production, only as "to battery" or "selling" when producing.
GS80481 Battery Charging.JPG
Thanks!

raysun
Forum Emperor
Posts: 1663
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower One: FX3048T, (2) FM80, MATE3s, FlexNetDC
Outback 200NC batteries (8 @ 48v)
Outback IBR3 battery enclosure
Suniva 330 watt panels (12 - 6 strings of 2 in series)
Hyundai 355 watt panels (6 - 3 strings of 2 in series)
Honda EU7000is gas fuel generator

Re: Generator backup

Post by raysun » Mon Feb 10, 2020 4:11 pm

SD

I can imagine your head is about to explode. ;)

Regarding the GEN AC IN settings. They should be set to the capacity of your generator (and as I outlined in a long winded response just above.) To recap:

1) Charger AC Limit: 10AAC

2) Gen AC Input: 20AAC.

3) AC Output: Manual default states 120VAC, but the Radian device menu in Optics lists the default as 240VAC. My setting is 240VAC.

This is the one that puzzles me. 240VAC would be the right choice, but the config screen shown earlier (from OpticsRE) shows parameters for 120VAC.

clarkef
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Posts: 76
Joined: Wed Oct 31, 2018 9:43 am
My RE system: Radian 8048A w/PV GSLC
FM100 CC x3
10KW of 72 cell panels (5S3P x2)
1600AH (usable) of Li-Ion modules @48v with SIMP-BMS
Midnite Combiners, SPDs
MilSurp MEP-802A ‘5K’ Generator
Location: South Central KY

Re: Generator backup

Post by clarkef » Mon Feb 10, 2020 4:14 pm

Swampdog wrote:
Mon Feb 10, 2020 4:00 pm

I have a Briggs & Stratton Elite (030209) 5500W gas generator, manual connect. Can't tell how how it is wired in, but it connects via the solar dedicated panel.

I have a volt-meter and can check the AC voltage at the L1/L2 breakers.

Input voltage: you are referring to the "Gen Input Voltage" in the GS8048A>AC Input>Gen setting? The default is cited as 50AAC, but my setting is already at 12.5AAC. If this is incorrect, please clarify.

Charger AC Limit: Default is 30AAC, but my setting is at 7.5AAC. I did not enter this setting, so no idea why it is not at the default.
Sorry - I realized after I asked those questions, I could have referred to your profile.

Your generator is listed as 5500 watts continuous. I would set generator limit setting to 22.x amps (5500W out /240V = 22.9A continuous).

Test the voltage at the Radian input (or monitor the Mate3 input voltage. I'd check with a meter though - each leg to neutral and across both hots. combined should match the generator voltage on the mate3. If the voltages are sagging (or bouncing), then you may need to lower your generator AC low voltage limit. I'd also have the generator serviced since they shouldn't drop like that. I hope you are using fresh gas and exercising your generator regularly?

I didn't realize you were AC coupled (should have looked at your profile). Are you the old-school AC Couple with the remote operated circuit breaker in the GSLC that disables the string inverter AC input when the generator is energized? I'm sure your Charger AC limit is an attempt to limit AC Coupling charging of the batteries - so more can go to the grid.

raysun
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Posts: 1663
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower One: FX3048T, (2) FM80, MATE3s, FlexNetDC
Outback 200NC batteries (8 @ 48v)
Outback IBR3 battery enclosure
Suniva 330 watt panels (12 - 6 strings of 2 in series)
Hyundai 355 watt panels (6 - 3 strings of 2 in series)
Honda EU7000is gas fuel generator

Re: Generator backup

Post by raysun » Mon Feb 10, 2020 4:22 pm

Oh goodness, I didn't read the whole history so missed the AC Coupling stuff as well. I'm going to defer to @Clarkef because my experience (and some of the above advice) is from my off-grid background.

clarkef
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Posts: 76
Joined: Wed Oct 31, 2018 9:43 am
My RE system: Radian 8048A w/PV GSLC
FM100 CC x3
10KW of 72 cell panels (5S3P x2)
1600AH (usable) of Li-Ion modules @48v with SIMP-BMS
Midnite Combiners, SPDs
MilSurp MEP-802A ‘5K’ Generator
Location: South Central KY

Re: Generator backup

Post by clarkef » Mon Feb 10, 2020 4:37 pm

Swampdog wrote:
Mon Feb 10, 2020 4:00 pm
Difference from solar settings? I assume you mean my GTO inverter? If you can be specific, I can try to get those figures from the digital panel on the inverter. Not available via my monitoring software and generally, SolarEdge only wants to work with installers. One of my challenges is that OpticsRE does not report on array production, only as "to battery" or "selling" when producing.
Yeah, sorry about that - again before I saw you were AC coupled. Based on your profile you have a 880AH bank yes? The AC Charger limits shouldn't be that low, unless it's done to limit battery charging as as to optimize AC grid sell.

If your profile is correct, you have NO DC charging correct? No charge controllers - just the grid-tie SolarEdge inverter and AC Coupling charging right? If that's the case, then the charging under generator should be exactly the same as the charging by Grid/AC Coupling as there aren't different parameters for grid charging (other than the throttle).

Clarke

clarkef
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My RE system: Radian 8048A w/PV GSLC
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10KW of 72 cell panels (5S3P x2)
1600AH (usable) of Li-Ion modules @48v with SIMP-BMS
Midnite Combiners, SPDs
MilSurp MEP-802A ‘5K’ Generator
Location: South Central KY

Re: Generator backup

Post by clarkef » Mon Feb 10, 2020 4:41 pm

raysun wrote:
Mon Feb 10, 2020 4:22 pm
Oh goodness, I didn't read the whole history so missed the AC Coupling stuff as well. I'm going to defer to @Clarkef because my experience (and some of the above advice) is from my off-grid background.
You were doing great! Your troubleshooting advice was spot on. I've invested a bit of time into both Generator and AC coupling recently. So it's relatively fresh.

Swampdog
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My RE system: 7.0 kw system
25 x Solarworld SW280 w/SolarEdge Power Optimizers
12 x 220 GH Energycell
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Outback Radian 8048a
Outback MATE3s
Outback HUB
Outback FlexNet DC
SOLAREDGE SE6000A-US
Briggs & Stratton Elite 5500w generator (8,500 surge; manual connect)

Re: Generator backup

Post by Swampdog » Mon Feb 10, 2020 4:52 pm

clarkef wrote:
Mon Feb 10, 2020 4:37 pm
Swampdog wrote:
Mon Feb 10, 2020 4:00 pm
Difference from solar settings? I assume you mean my GTO inverter? If you can be specific, I can try to get those figures from the digital panel on the inverter. Not available via my monitoring software and generally, SolarEdge only wants to work with installers. One of my challenges is that OpticsRE does not report on array production, only as "to battery" or "selling" when producing.
Yeah, sorry about that - again before I saw you were AC coupled. Based on your profile you have a 880AH bank yes? The AC Charger limits shouldn't be that low, unless it's done to limit battery charging as as to optimize AC grid sell.

If your profile is correct, you have NO DC charging correct? No charge controllers - just the grid-tie SolarEdge inverter and AC Coupling charging right? If that's the case, then the charging under generator should be exactly the same as the charging by Grid/AC Coupling as there aren't different parameters for grid charging (other than the throttle).

Clarke
Amp-hours... I have 12 x 220GH batteries. Don't know how to calculate and could not find a spec.

I would want to optimize grid sell, as since grid-tied, the back-up is only needed during outages. Generally, the array output is enough for our daily loads.

Not sure how to answer. I do not have a charge controller, but we can receive power during array production and sell at the same time, excess from array also charges batteries.

raysun
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My RE system: Flexpower One: FX3048T, (2) FM80, MATE3s, FlexNetDC
Outback 200NC batteries (8 @ 48v)
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Suniva 330 watt panels (12 - 6 strings of 2 in series)
Hyundai 355 watt panels (6 - 3 strings of 2 in series)
Honda EU7000is gas fuel generator

Re: Generator backup

Post by raysun » Mon Feb 10, 2020 5:25 pm

I think the battery blocks are 220AH @ C20 discharge rate. The battery would be 48V @ 660AH.

The B&S documents on the generator specify a runtime Amperage of 20.8A. So, if AC coupling doesn't impact the generator AC IN settings, reasonable parameters might be:

Gen AC IN Max Amperage: 20AAC
Charger AC IN maximum Amperage: 10A

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