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My solar system running.

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Hungvo4

New Member
Joined
Apr 11, 2020
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I would like to share with you my solar system as my first time in solar system build.
System includes:
- Growatt 6kw
- Panels 1.2k ( I will add 7kw soon)
- Battery: 18 kw. ( 4.5Kw each, 4 total)

The system plug and play well settings is very simple as clear instructions.
I love the all in one inverter Growatt. Hope save enough money buy another 12kw.

Only one thing I found on this inverter is the max wire to connect is 6Awg AC output I wish it is 2 Awg or 0 Awg ( for safety to connect my breaker box)
Over all I love the inverter Growatt. .
 

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Looks good but one additional thought to offer.

Your batteries show 55v and the main rotary shutoff switch is only rated to 48v if it’s the one I think it is.
 
JoeHam said:
Looks good but one additional thought to offer.

Your batteries show 55v and the main rotary shutoff switch is only rated to 48v if it’s the one I think it is.
Click to expand...
Iam total agree . what you should advice on the switch off for safety issue. please Thank you
 
What will be the maximum amperage through the main wire?

I would probably replace both the fuse and switch with an appropriately sized DC breaker.
 
JoeHam said:
What will be the maximum amperage through the main wire?

I would probably replace both the fuse and switch with an appropriately sized DC breaker.
Click to expand...
Each battery is 48Volt at 90 Amp and wire size id 2 awg so i think max amp of 4 batteries is 360 Amp and the switch only 350Amp at 48 volt. the fuse is only 200A. please let me know what a good DC breaker to take care safety issue. thank you
 
Remember that your fuse or breaker is there to protect your wire from catching on fire.

You shouldn’t run more than 125 amps through 2 awg, even for a short run as you can see here:


I like Schneider, Midnite Solar, Blue Seas breakers, all good brand names.

@SolarQueen works for Alt-E and is a forum member who does this stuff all day. Here is one of their offerings:

Midnite Solar 125 Amp 125VDC Panel Mount Breaker with Remote Trip

Click here for Midnite Solar, Inc. Midnite Solar 125 Amp 125VDC Panel Mount Breaker with Remote Trip from altE® - Making Renewable Do-able since 1999.
www.altestore.com www.altestore.com
 
Hungvo4 said:
I would like to share with you my solar system as my first time in solar system build.
System includes:
- Growatt 6kw
- Panels 1.2k ( I will add 7kw soon)
- Battery: 18 kw. ( 4.5Kw each, 4 total)

The system plug and play well settings is very simple as clear instructions.
I love the all in one inverter Growatt. Hope save enough money buy another 12kw.

Only one thing I found on this inverter is the max wire to connect is 6Awg AC output I wish it is 2 Awg or 0 Awg ( for safety to connect my breaker box)
Over all I love the inverter Growatt. .
Click to expand...
Very nice. Can you share a little bit on you batteries, like chemistry, source and cost?

How big of a wire can you fit in the Growatt PV terminals? That's my biggest pet peeve with MPP Solar.
 
Hungvo4 said:
Iam total agree . what you should advice on the switch off for safety issue. please Thank you
Click to expand...

I don't think it is going to present any real problem at all unless you need to open the switch with current flowing.

The other possible issue is the ever-moving number for what voltage is hazardous to humans. But the way things are mounted, no exposed contacts. Basic rule is to require a tool to access hazardous voltages. That could be where 48V spec came from.

Fuse looks like ANL. What is it's interrupt rating? What short-circuit current can batteries supply? What individual fuses do they have? Looks like a "Y" connection to four smaller battery wires.

On one hand we like a switch/breaker to isolate fuse before putting a wrench on it, on the other hand we like a fuse first thing at the battery. Maybe a built-in fuse takes care of yours. I use a breaker built in to my multiple inverters to interrupt current, and a fuse at my single battery bank for short-circuit protection.
 
Nice install! Can those growatt inverters be parralled? Or what you buy is what you buy? I did see the growatt 12k and it peaked my interest.
 
I have to agree, it's a very nice, tidy clean installation, well done.
#6 AWG for AC from Inverter to Panel is fine.... AC isn't like DC and it's too easy to get in aloop on that point... heck still happens to me, gotta change "lanes" between AC & DC as it were.
NM, TW, & UF WIRE (Copper Conductor) 6 AWG - 55 AMPS
SE CABLE (Copper Conductor) 6 AWG - 65 AMPS

I ran #6/3 NMWU & #8/3 NMWU from my powerhouse to house via 4" underground conduit, to be ready for any upgrades down the road if needed. Got a super deal on the wire at the time, couldn't pass it up. 75' each run, copper adds up darned fast! LOL
 
erik.calco said:
Very nice. Can you share a little bit on you batteries, like chemistry, source and cost?

How big of a wire can you fit in the Growatt PV terminals? That's my biggest pet peeve with MPP Solar.
Click to expand...
The Battery I bought from https://www.techdirectclub.com the cost is $1000 each 48Volt Lithium 90A BMW and capacity is 90% but I full charge is 58.7 volt great battery and very happy with them. it include BMS plug and play.
The Growatt PV terminal wire is 6 Awg and it 6KW but 12KW just available on market 5 days after I bought 6Kw in August.
 
SolarBro said:
Nice install! Can those growatt inverters be parralled? Or what you buy is what you buy? I did see the growatt 12k and it peaked my interest.
Click to expand...
On Growatt 6kw can not connect parallel but the 12Kw you can connect parralle to make 24Kw and i think cost each $2400 include shipping cost
 
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