live4soccer7
Solar Enthusiast
- Joined
- Jun 15, 2020
- Messages
- 670
Are the fuses on the PV panel side of the breakers? I'm just trying to get all components lined out for my drawing.
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Fronius inverters have a built in DC disconnect on the input. I'd love to know how it works because it's a small plastic handle attached to a small plastic box inside the inverter and it must carry the full input current/voltage. The square D DC disconnect is about 10 times the size. The disconnect is manual, and I don't know if there are conditions that would cause the inverter to automatically disconnect the DC.@MarkSolar Is your DC disconnect on the inverter something manual or automatic if a fault or other issue is detected?
Fusing arrays for the Fronius isn't required. Unless you have some local code requiring it.None of them will be combined.
Yup, PV side. This is the way it looks hooked up. Water tight. Overkill with both fuses and breakers, with each string going to a separate MPPT in my inverters. (Each LV6548 has 2 x 4000 watt PV inputs at 250V 18amp)Are the fuses on the PV panel side of the breakers? I'm just trying to get all components lined out for my drawing.
I just built my own. Alibaba breakers/fuses and home depot electrical boxes.
Its just to pass inspection if needed. I went cheap on them. Everything is well grounded though.You have Delta lighting arrestors mounted.
Do you have any illusions they will provide some protection?
How about a report of measurements verifying what they can actually do?
Its just to pass inspection if needed. I went cheap on them. Everything is well grounded though.
Yup, I saw those. Midnight is a much better solution. I even like the little lights. I have all the good stuff on my HAM antenna, including an 8' ground rod.Shouldn't matter to an inspector.
If you have utility grid connection, ought to have something there to swallow surges.
PV array can pickup coupled spikes from nearby lightning, so recommended there too.
Here's my test result:
Delta LA 602 Lightning Arrestor "Hey! Is this thing on??"
I've been using Delta Lightning Arrestors on my system since they were spec'd by Real Goods as part of the package I bought from them. I now have a surge capacitor on the AC input as well, which is supposed to slow rising edge of voltage so it doesn't get as high before the Silicon Oxide...diysolarforum.com
Other parts that did work as expected:
Testing Metal-Oxide Varistors (MOV)
Surge arrestors are used on AC and DC side of PV inverters for protection, to clamp high voltage transients. One inverter I have (actually several) are in the SMA family SUNNY BOY 5000-US / 6000-US / 7000-US / 8000-US. These come with a kit of MOV to protect the DC side: The MOVs are about...diysolarforum.com
Midnight has videos of their guys and a lab testing their lightning arrestor and the Delta.
Thanks! I'll definitely take a look at that. I always like to look forward a bit to leave options open.@live4soccer7 One thing to consider which I can't recall being mentioned is to consider including a Fronius consumption monitor "smart meter" in your main grid supply circuit board. It then connects to the data manager card inside one of the inverters via a data cable (and subsequent inverters).
The version of this you have in the USA is different to ours but I think functionally it's the same:
Smart Meter
www.fronius.com
It provides a plethora of data on your grid imports and exports, which combined with your inverter production data enables you to have a great understanding on your system performance, your household consumption as well as a whole range of data points.
These are the data channels the inverter provides (this is via Fronius Solarweb). My system is three phase so some data channels reflect that:
View attachment 65978
And below are the addition data having the smart meter enables:
View attachment 65979
View attachment 65980
The Fronius has built-in relay controller which can be used for things like when a hot water service operates and programmed based on PV production or excess/export production values.
Data can be polled via your own systems if you want and there are Home Assistant integrations available as well which can of course be part of home automation actions:
Fronius
Instructions on how to connect your Fronius SolarAPI devices to Home Assistant.www.home-assistant.io
e.g. perhaps you set up certain circuits or appliances to operate when a particular combination of events occurs (be it time of day, weather, excess solar production etc).
Just some stuff to consider down the track for which having the data metering can enable.
I can't imagine they don't. Stacks of Tesla Powerwalls in AC coupled systems with Fronius Primo inverters here, and the PW uses grid frequency control to moderate the inverter's output when operating in off-grid mode.I still need to make 100% certain that fronius primo can do frequency watts.
Great to know! I planned on reaching out. I'm sure I will sound pretty incompetent on the phone though. hahaI can't imagine they don't. Stacks of Tesla Powerwalls in AC coupled systems with Fronius Primo inverters here, and the PW uses grid frequency control to moderate the inverter's output when operating in off-grid mode.
I'd be making a call to Fronius HQ in the USA to ask the question and get them to point you to relevant documentation.
I can find lots of vendor pages that say they do, but I've never found anything on a Fronius page that says they do. I'd call and ask them to point to a statement in their documentation.I still need to make 100% certain that fronius primo can do frequency watts. I do wish it had the SPS functionality, similar to the sunny boy as well.
Same problem I had, they were just a hair too low for me to use. The Fronius supports 33A on one of their two trackers, seems like a really big difference given the other parameters are relatively similar.Even if I wanted to do SMA, it seems the max input DC current is 10A / MPPT. That definitely would not work since the panels I'm looking at are all higher than that (around 11A)
View attachment 65983
You would think they would have higher input currents on the SMAs given the higher power panels now. Looks like they need a new version. Might be why they are on sale at some places.I can find lots of vendor pages that say they do, but I've never found anything on a Fronius page that says they do. I'd call and ask them to point to a statement in their documentation.
Same problem I had, they were just a hair too low for me to use. The Fronius supports 33A on one of their two trackers, seems like a really big difference given the other parameters are relatively similar.
I still need to make 100% certain that fronius primo can do frequency watts. I do wish it had the SPS functionality, similar to the sunny boy as well.
Even if I wanted to do SMA, it seems the max input DC current is 10A / MPPT. That definitely would not work since the panels I'm looking at are all higher than that (around 11A)
View attachment 65983