Growatt 3000 Hybrid System Design Feedback Appreciated!

dcolli32

New Member
Hello Everyone,

Over the past couple of months I have worked on a plan for a hybrid solar system for the house. I wanted to share and hopefully get feedback from you all.
The system will run about 3-5 branch circuits in the house. Mainly just taking some of the load off the utility. Ok so here it goes.

Solar Array InputHouse AC Input

370W 72cell Silver Mono Solar Panel by Renesola

JC370S-24/Abpw.

4 panels 2s2p

STC
370W
Imp - 9.28A
Vmp - 39.9V
Isc - 9.81A
Voc - 47.8V
Max series fuse - 20A
2S
47.8 x 2 = 95.6 V @ 9.28A


2P
9.28A x 2 = 95.6V@ 18.56A

Fuse at inline 20A each string

1774.3 W

TEMCo 100' Red + 100' Black 10 AWG/Gauge Solar Panel Extension Cable with M/F Solar Connector Ends (Variety of Lengths Available)


120V
Fuse/Breaker to Growatt

50 A breaker
smseace Miniature Circuit Breaker Low Voltage 50A 400V 2 Poles DIN Rail Installation DZ47-63 C50
Fuse/Breaker to Growatt

60A breaker
I’m not sure which product to use here. Suggestions?
Siemens WN2060 AC Disconnect 60Amp Non-fused

#6 wire
Southwire(By-the-Foot) 6/2 Stranded Romex SIMpull CU NM-B W/G Wire
Physical Disconnect

Ampper Battery Switch, 12-48 V Battery Power Cut Master Switch Disconnect Isolator for Car, Vehicle, RV and Boat (On/Off)

Growatt SPF
Inverter Output:

24V
3000W
120V out
80 Amp Mppt
Surge 6000W
Wifi module
Solar Charger:


Solar 2000W
30-115 VDC
Max open cir. - 145V
Max current - 80 amp
AC Charger:


Charge current
60 Amp

AC input 120V
Voltage range 65-140V
Battery
Wiring - I saw charts to suggest 2/0 or 4/0.

Suggestions?
AC Out to House

Victron 500A Smart Shunt
Physical Disconnect

Ampper Battery Switch, 12-48 V Battery Power Cut Master Switch Disconnect Isolator for Car, Vehicle, RV and Boat (On/Off)

Physical Disconnect

None? Or suggestions?
Siemens WN2060 AC Disconnect 60Amp Non-fused
Battery
Bigbattery.com

24V HAWK MAX - LifePo4 - 202Ah - 5.2kWh
Or
24V GRILA - LiFePO4 - 240Ah - 6kWh
Battery Fuse/Breaker

300A

WindyNation ANL Fuse Holder + ANL Fuse (2pcs 300A Fuse)

Or

M1A2 Circuit Breaker 300A Waterproof Fuse Inline Holder Resettable Fuse Manual Reset 12V-48V DC
House AC out

I am not sure of the size of wire between Growatt and Load center. 6/2 romex?

Southwire(By-the-Foot) 6/2 Stranded Romex SIMpull CU NM-B W/G Wire

Or
4/2, if I base on 80 amp max output

For AC Breakers

QO 100 Amp 8-Space 16-Circuit Indoor Surface Mount Main Lug Load Center with Cover, Door
Looking for a 50 or 60Amp main

Square DQO 50 Amp 2-Pole Circuit Breaker

Or​

Square DQO 60 Amp 2-Pole Circuit Breaker Must a main be 2 pole?​


I will use a copper bus bar to bridge the two “hots” sides of the panel

6- Square DQO 15 Amp Single-Pole Circuit Breaker

A couple of the runs from the garage to the outlets are 75 ft so instead of running 12/2, these runs will have 10/2
 

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NHRenewables

New Member
I would suggest going 48v and inverter with high voltage string capability. If you have the time, consider purchasing LifePo cells via Alibaba to maximize your $/kw.
Prior to purchase, I’d recommend you size out your loads by doing an energy audit. Even with a grid tie all in one, most people are trying to minimize the monthly bill. The larger the battery bank paired with sufficient panels, the more likely you can make it through the grey days.
 
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