Hello BoB:
Barcelona with firmware 24.02.14.07, MNGP2 with 24.02.08.0.
I have solar connected to MPPT2, nothing on MPPT1. The status at the bottom on the MNGP2 MPPT display is reversed, so current status for MPPT2 (FLOAT) is displayed for MPPT1, and (RESTING)for MPPT2. Also voltage on MPPT1 shows about 51V but has nothing connected to it and the breaker is off.
When MPPT2 breaker is off, I don't see PV+ to ground. When the breaker is on, I see PV+ to ground. Is that supposed to be?
I have 8 REC405 panels on MPPT2. Voc for them is about 49V, Vmp is about 43V, but I am not seeing that. Instead I get about 340V, or about 43V each, a long way from 405 watts. I checked three of them open circuit, and that is correct: 43 volts in full sun. Best wattage so far is about 2250, so my batteries can charge ok. Is there any reason for this?
Is there any word on rapid shutdown for the Barcelona or CAN support for EG4LL batteries?
Been over 100F here for a while.
R.
Quote from: Raster on August 13, 2024, 12:28:55 AMHello BoB:
Barcelona with firmware 24.02.14.07, MNGP2 with 24.02.08.0.
I have solar connected to MPPT2, nothing on MPPT1. The status at the bottom on the MNGP2 MPPT display is reversed, so current status for MPPT2 (FLOAT) is displayed for MPPT1, and (RESTING)for MPPT2. Also voltage on MPPT1 shows about 51V but has nothing connected to it and the breaker is off.
When MPPT2 breaker is off, I don't see PV+ to ground. When the breaker is on, I see PV+ to ground. Is that supposed to be?
I have 8 REC405 panels on MPPT2. Voc for them is about 49V, Vmp is about 43V, but I am not seeing that. Instead I get about 340V, or about 43V each, a long way from 405 watts. I checked three of them open circuit, and that is correct: 43 volts in full sun. Best wattage so far is about 2250, so my batteries can charge ok. Is there any reason for this?
Is there any word on rapid shutdown for the Barcelona or CAN support for EG4LL batteries?
Been over 100F here for a while.
R.
Hi Raster,
Not a lotta time for a Post right now, but, to start:
First, feel free to start a new Thread for your situation. Your post may "hide" on page 8 of a thread, and not get the attention it deserves.
Most MPPT CCs will show about 2/3 of the battery voltage of the battery to which it is connected, so, that 50-ish volts on the unused MPPT seems fine to me.
As you probably know, PVs are rated at 25 degrees C, cell temperature -- 77F. The heating of the cells from the radiant sunlight causes this max PV output to be reduced to about 75-80%, of the maximum rating, and, this peak is generally only available at Solar Noon, with PVs at right angles to the sun.
Are you using the MN Barcelona Breaker Box?
More later, Vic
Quote from: Raster on August 13, 2024, 12:28:55 AMIs there any word on rapid shutdown for the Barcelona or CAN support for EG4LL batteries?
Been over 100F here for a while.
R.
I do not know the answer to that one. Hopefully Ryan or someone who knows the answer will answer.
boB
Vic:
Yes, I have the breaker boxes. Very happy with all the Midnite equipment. The Barcelona is very noisy when the fans come on. First system I put together that can do something useful.
Max I have seen so far is about 2500 watts, which is 77% of rating. Over 100 every day. It didn't sink in it was that serious when reading the spec sheets. I have some LGs mounted where I can check the undersides, and they can get to 150 degrees.
When the Barcelona is in FLOAT, is there some way it can run the Rosie loads, instead of just sitting idle or trickle charging, so on good days with batteries charged, solar can run all the loads, and use the batteries just at night?
R.
Quote from: Raster on August 13, 2024, 12:28:55 AMBarcelona with firmware 24.02.14.07, MNGP2 with 24.02.08.0.
I have solar connected to MPPT2, nothing on MPPT1. The status at the bottom on the MNGP2 MPPT display is reversed, so current status for MPPT2 (FLOAT) is displayed for MPPT1, and (RESTING)for MPPT2. Also voltage on MPPT1 shows about 51V but has nothing connected to it and the breaker is off.
The RESTING on MPPT 2 has been causing support calls too so let me explain. The original plan was to display individual CHARGE STAGES on the Barcelona. The issue discovered was the CANBUS specification did not have a register to store the 2nd MPPT's CHARGE STAGE. The MNGP2 programmer built the display PAGE with a RESTING "Placeholder" waiting on the register data to be implemented. We had him "HIDE" that status until such time the data is available in the latest firmware. No date on the implementing of this...
Quote from: Raster on August 14, 2024, 12:06:20 AMVic:
Yes, I have the breaker boxes. Very happy with all the Midnite equipment. The Barcelona is very noisy when the fans come on. First system I put together that can do something useful.
Max I have seen so far is about 2500 watts, which is 77% of rating. Over 100 every day. It didn't sink in it was that serious when reading the spec sheets. I have some LGs mounted where I can check the undersides, and they can get to 150 degrees.
When the Barcelona is in FLOAT, is there some way it can run the Rosie loads, instead of just sitting idle or trickle charging, so on good days with batteries charged, solar can run all the loads, and use the batteries just at night?
R.
Hi Raster,
YES, I am very happy with all of the MN equipment that is in service, here -- all of the Classic CCs here have been in daily off-grid service since early 2011, thirteen years!! This is a long time, for power electronics.
It seems to me, that you are getting expected PV Production, given your report. Hot WX will reduce production further, compred to that, with more moderate WX.
If your Rosie and the Barcelona are on the same battery bank, then, even when the Barcelona is in Float, it will power loads, until the point when there is insufficient PV production, at which time, the Barcelona will show, "Float-MPPT".
You have some very fine equipment in your Solar system!
... Keep cool, Vic
Vic:
You are right on the money.
Today:
Panels: 8x REC405AAPure, ~4" air gap underneath
Battery pack: 54v (float)
Roof: metal, 3:12 slope, south facing, way too hot to touch, panels probably 140+ (a hose will get that hot)
Location: Texas, 3:30pm, live numbers vary a little
The numbers:
Env AirT Panel-F Panel-C Voc Vmp Watts %Prod 8xVoc 8xVmp 8xWatts
STC - 77 25 49.1 41.8 405 100 392.8 334.4 3240
NMOT - 111 44 46.3 39.4 308 76 370.4 315.2 2464
Live 100F - - 42.8 34.8 292 72 343.1 278.5 2342
Panel temperature does have a tremendous effect. Down to 72% for hot August days.
R.
Quote from: Raster on August 14, 2024, 12:06:20 AMWhen the Barcelona is in FLOAT, is there some way it can run the Rosie loads, instead of just sitting idle or trickle charging, so on good days with batteries charged, solar can run all the loads, and use the batteries just at night?
If you have grid power connected to Rosie and loads in a separate load panel box you can actually "push" back at the incoming power using "GRID SUPPORT" mode. This mode tries to power your loads while taking zero from the grid connection while there is solar power available. BUT, early firmware actually pushed back too much and actually would sell power of about 100-150 watts which if you don't have a Net-metering agreement to back-feed will get you a visit from the Power Police. Your "smart-meter" will squeal on you. I think they tried to not go back more than a few 100 watts incoming on newer firmware, this means push back all but 100 watts or so incoming.
You can set a battery voltage or SOC% to decide when and how long to "support loads" which means you can actually run the battery down a bit overnight. If you don't have a grid input or use a generator then this will not work...
I split this topic off so it wouldn't get lost in the other thread
Wiz:
No generator, and no AC in.
Does that mean that Barcelona won't run daytime loads when the batteries are full, or is there some way to control that function? Famous fortune cookie message: Wash face in morning and neck at night.
Today, with a few hundred watts of load on the Rosie, Barcelona was idle unless trickle charging. That is the way it appears.
R.
Quote from: Raster on August 14, 2024, 12:06:20 AMYes, I have the breaker boxes. Very happy with all the Midnite equipment. The Barcelona is very noisy when the fans come on. First system I put together that can do something useful.
Would you say the Barcelona is way louder than the Rosie?
I have a Rosie and a Victron rs450/100 which does have fans but they are large and slow running, so at full 100A charge the noise is low frequency and more of a woosh. I'd love to add a Barcelona for more charge capability but if its super loud that's a deal breaker for me. Also I'm used to per second stats via Cerbo and VRM, my Rosie just shows up as a DC load. My understanding is the Hawkes bay 90A version is completely passive versus fan cooled for the 120A HB and the 200A Barcelona?
Quote from: Raster on August 16, 2024, 04:15:40 AMWiz:
No generator, and no AC in.
Does that mean that Barcelona won't run daytime loads when the batteries are full, or is there some way to control that function? Famous fortune cookie message: Wash face in morning and neck at night.
Today, with a few hundred watts of load on the Rosie, Barcelona was idle unless trickle charging. That is the way it appears.
R.
Generally speaking if the float voltage is dialed in the MPPT will ratchet up and down as loads come and go, it is not instantaneous it should ramp pretty quick
Brucey:
The Barcelona fan(s) seem to come on full when it/they do, and are pretty loud, but are off most of the time. Not stressing the system yet.
Rosie has been nicely silent. Just small loads so far: led light, mini-fridge, battery chargers, garage door opener, and microwave. Plan to add a mini-split, cameras, fridge-freezer, water heater, and network stuff. I had a new building done (not connected to anything) to do all the experimenting in.
R.
Quote from: Raster on August 19, 2024, 01:30:09 AMBrucey:
The Barcelona fan(s) seem to come on full when it/they do, and are pretty loud, but are off most of the time. Not stressing the system yet.
Rosie has been nicely silent. Just small loads so far: led light, mini-fridge, battery chargers, garage door opener, and microwave. Plan to add a mini-split, cameras, fridge-freezer, water heater, and network stuff. I had a new building done (not connected to anything) to do all the experimenting in.
R.
Thanks for the info Raster. Wonder if there could be a firmware update to allow the fans to ramp up slower versus all or nothing on the Barcelona. And then maybe the Hawkes bay 90 and 120A are quieter as they have less power to dissipate?
I do love the silence of my Rosie, generally under 1500W the fans stay off, no serious transformer hum like my Victron Pheonix 48/1200.
I think that all of the fan circuits allow 3 speeds
OFF, medium and high.