amps

Hi everyone. I have 2x Sunpower E-20 327w solar panels that i'm going to install. The output of these panels is shown in the image below:

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Now, my question is about wire sizing. I will use 6AWG from the panels to the Victron 100/50 smart solar controller which will be within 3' of the batteries. 6AWG is good for 37amps effective use current, so that should be more than enough for the approx 20' fun from the panels to the controller (i'm open to other suggestions on wire size if you have advice).

My biggest concern is wiring size from the controller to the batteries. The 100/50 MPPT can only accept up to 6AWG (37amp wire). From my research, that can be a problem given the panels statistics. When the MPPT uses the extra voltage to create more charging amps, the amps can spike considerably on the MPPT output side to the batteries. The panels are approx 650w together, divided by 12v = 54.17amps potentially coming out of the 100/50 MPPT to the batteries. I know there are losses here and there, but it will still be way above the max current rating of 37amps for the MPPT's max wire receptacle size of 6AWG.

Feel free to blow my limited knowledge of all this out of the water. Im new to it all but the brain cells are firing on all cylinders, but I could be completely off the rails with it all.

I apologize if this sounds a little long winded or confusing....probably because I am confused! haha.

Looking forward to any and all advice, help. Thanks in advance.

Scrimma

I had 2x200 watt 12v nominal panels connected in series attached to my Victron 100/20 charge controller. The most watts they ever pulled was ~270 according to VictronConnect. I figured it was due to a very long cable (70 feet). So recently I added two more panels to get the panels up to 48 volts, and should be 800 watts. But in VictronConnect it's still showing only around 270 watts on a perfectly sunny day. In Connect, the voltage is showing that it has doubled since there were just two panels, so that looks good, but the amps is showing that it's been halved. Any ideas?

Hallo !

I have a 1200 watt oven that has drawed that (almost 1200 watts and approx. 45 amps) every time I have switched it on. (I bought the oven new last summer)

However, the last three times I have used the oven has used almost 3600 watts at about 125 Amps (!!).

-I get an "Overload L1" message followed by "Recovery" every time (VE.Bus).

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What could be the cause of this?

I dont understand how or why this could happen (the only other appliance i a fridge that pulls about 70 watts for a few minutes every hour).

(I have an offgrid Easysolar 3kVA (24/3000 - 150/70) with 10 kW lithium ion and 1,8 kW panels.).

Alittle disturbing that my system draws almot three times more amps than I expect, so would greatly appreciate views/solutions to this.

Eric

I have 3 domestic batteries and one engine battery. I assume all negatives go to the shut? The voltage goes down to 12.1 v yet the bmv says 100% and infinity time remaining. Any clues? Thanks

I'd like to be able to see amp hours in the Color Control instead of just watts, including input and output on all connected devices. Does anyone know of a program that can do this?

I have installed a new BMV-712 on my camper that has 2 x 12v 115AHr AGM's in parallel. I also have a separate Volt/Amp meter installed. The BMV reads current lower than what it actually is. 3-5 Amps on Charge and Discharge. 10mm cable used to connect the shunt?
I have no idea if the BMV is just not a very accurate device or how to investigate the problem

Just one more question; IT was sunny, solar panel deliver 17-18 volts, says my victron 75/15. The battery is full (over 13 v). Is that why victron only deliver 1,5 amps? If the battery was low, lets say 12,2, my victron would deliver up to max amps? My solar panel says Max 3,98 amps ....

Just help me - on my Victron connect. What is solar current and Battery current? And why is battery current higher than solar current? Is that the Mppt magic?

i have a 3000 watt inverter running off a 660 amphour 12 volt battery bank. i occasionally will pull close to 300 amps for several minutes from the battery bank. this seam like it would exceed the amp rating on the 220a smart battery protect unit. could i run 2 of these units in parallel to provide the amperage capacity? or is there another similar product. my primary desire is adjustable/programmable low voltage cut off protection.

Hello, anyone else having an issue with the app showing very low amps on the solar side. Have hooked up to old controller and VTVM, both show 10.9 amps, App shows 2.5 or less. Thx for the help.

Mike

Good Afternoon, I am currently designing a hybrid battery system across three phase, the phases are unbalanced and can't be fixed due to the sites businesses. I know that the max AC amperage output is 2 x 100 amps, on a 15kVa Quattro. but if I install 2 per phase does that give me a total of 400 amp output per phase or I am miss reading the spec sheet. My Ampage max output is at its highest around 12 midday and i am also installing 100kWh of BYD batteries that will move up 200kWh by mid-year.

Please can someone just confirm what the max AC amperage output is in this situation

Hi! My newly installed Solar Charger draws about 45 mamps out of my 24AH Battery in my boat.

That discharges the battery in a week or so.

Is that high current normal in sleep mode? The load output is 'always off', no solar cell connected.

Hi All

I have a 6ooAh AGM batt bank on a sailing boat (3 x 200Ah)

What is the max safe current drain for said bank, especially with longevity in mind?

Reason:

I have a 1,6kW 230V AC watermaker and would like to run it off the batt bank through an inverter for about 30min at a time. (and some other power tools on the odd occasion)

I do have a generator so that watermaker can be run for longer periods but for 30min (making 50L of water), it would be very convenient to not use the generator, not to mention saving petrol, fumes, and noise.

I have 640W solar and 300W wind gen which should be more than enough to deal with the discharge, I believe, on a sunny day.

So, is there a rule of thumb for a max safe discharge current for (AGM in my case) Lead Acid Batteries?

My gut feeling is that 300A for an hour on a 600Ah bank should be safe. But then my 2nd gut will freak out when it sees 200A of discharge on the BMV.. Even 100A is a hell of a lot in my mind.

Regards

My controller shows I made 2.15 KW yesterday. I am trying to determine the approx Amps it would have put back into the battery.

I used a Calc program and if I calc it at 80v I get 27 amps and if I use 12v its 179 amps. We had reasonable sun yesterday in the desert of Arizona. Since the voltage from the panels varies all day long depending on clouds and angle of the sun I am wondering what voltage to use to calculate the approx amperage put back from the KW reported by the 100/50 controller.

Thanks, Bill .

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Please see picture. I'm trying to figure out why no watts are being tracked as well as the crruent/amps always seems to show zero in both solar and battery section. This happens even when I plug in a space heater and put it on high. That should definitely draw some amps. Please help.

Editing to add some more photos that may help:

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Thanks!