Im currently on grid with a 3kw and 5kw system and im looking to expand this and hopefully feed in surplus energy. Im in Australia so 230v
Have each solar system feed into a multiplus II 48/500 (they can handle 50A input)
have a 3rd multiplus II GX and set up a 3rd inverter a 10kw unit which will come close to maxing out the multiplus’s input 50A
Have a large 600ah or so battery bank. Each inverter will pull ~100A max so either 2 x 200A bms (if i go 2 x 300AH batts) or a single 350A BMS
Then have the 3 paralleled multiplus II’s feed into my switch board via 25A CB’s which then has RCD’s ect ect
Battery would be fused or CB rated
2 original inverters are grid approved and export so ill leave there settings as is.
New 10kw inverter has a CT so i can stop it exporting to grid if over 5kw export.
I prefer to use on grid inverters over victrons MPPT’s as well i have them already and for the new one its alot easyier and cheaper to use sungrow/goodwe inverter that has 600V input at 1/3 the cost than the 450/200.
Down the track i could get the multiplus’s to export to the grid if i know ill get surplus solar the next day,
my 9kw of panels gets me lets say ~40kwh a day on average i should double that to 80kwh.
Plus having surplus solar means on cloudy days i still generate some solar. ideally id like to have 2 days reserve of power. But may even set up each AC1 as esstional and AC2 as not so important.
Have i forgotten anything or is it silly to use the AC input of each inverter for my current inverters.
Should they be set up on the output for example (will they back feed and charge the batts)
I have something similar. Finding an electrician that knows the Victron gear and can get you CEC and grid compliant is the hard part. I have a mix of MPPT and grid-tied. I have 2x 5kW inverters on 2 phases. I could only put 10kw of inverters on a single phase, so added a 450/100. I have 5.5kw on the 450/100, get about 34kWh of charge. The 2x 5kW inverters do 35-40kWh a day ea, my overnight usage is about 25kWh. If I get a bad day with clouds and don’t charge, I have a 36kWh battery that will last at least 3 days.
If I get a good sunny day I can put 36kWh back in using the MPPT or AC charger from the multi 48/5000. The only thing you need is a grid meter, an anti-island device and find that rare electrician.
Trust me, get the 450/100 it’s galvanically isolated and has ground fault detection so you dont need to spend $700 on a ground fault detection device. My arrays are east and west so they do 100 amps all day. There are 2 strings so you can set 2 arrays for best capture.
My electrician installed an ABB anti island. I think there are Victron ones you can get. The 1:1 to rule is for AC coupled not grid tied. If you have 10kw on the grid it will not matter. Our rules have changed in the last couple of years with a shift to battery storage, and I can get another 5kW that is AC only and the inverter charger is not counted.
I use a Shelly 3em for the grid meter. It does need some extra code added to the venus OS but is very simple. The victron grid meters work well but if you have more than one phase you will need a 3 phase meter.
I couldnt sleep last night so got a killer deal on GE 10kw hybrid inverter (store display) ($1750ish) is HV battery so will go with an EV based pack. 70kw arround 3k
While CEC approved, the software looks horrible so lets hope i can set it up fine. Its based on a goodwe so should be ok
I still have 2 grid tie converters so gotta make sure i can couple them in my system and run a anti islanding device.
Ill likely go pick a pellet up (36 panels) of 440w jinkos replace a string on the existing 5kw then load up the 10kw inverter.
We do have a few ex solar guys at work so ill rope them in.
should have 20kw+ of panels on 18kw of inverter s0 will “likely” need grid limiting but will pump 8kw (~35A) into the grid when i can as its what ive been approved for.