Thanks 🙏 - more solar battery content on the way!

You’d be surprised the arguments I’ve had on Twitter and KZfaq about this… agree why fit 2 if one meets the requirements

Depending on the inverter disconnect (what we call isolator switches on this side of the pond) means that you would have live PV wires in the inverter unless you shut off any disconnects at the array, as we *never* use MC4 connectors at the inverter. Everything is in conduit or a raceway of some sort.

But you would not have a DC isolator and an AC isolator in series. No cable in the installation is going to be carrying DC and AC at the same time, or even at different times.

Keith is a legend

yes but nothing for the end user. I keep trying to find answers to really basic questions for the end user. they don't answer comments or check their own forum. this video is a good overview. love the inverter but it's made for engineers, and even then the installers don't learn the configuration post install.

Shame their manuals don't tally up

One of our team has just installed one in his home. We are confident in the brand and technology.

😂

You can use these as regular solar inverters and add batteries later if required.

After lots of testing most need a separate esth rod on island or IT mode.. And fitting a type A rcd socket 😊

Visual torque that's new 😂

The battery can go in any direction, it’s the wiring regs which stipulate the IP4X requirements. Originally they were designed to mount in 19 inch racks.

We’ll try to get hold of one and find out

wondered why I couldn't hear anything 😂

@@efixx Hehe, Im the same. You can see it with a sound analyser. It can make transformers in power supplies scream. Poor kids.

@@timlist5664 pardon?!

All the manuals suggest that battery isolators and fuses / circuit protection should be fitted.

I asked the installers and they contacted SS who said it wasn't necessary to be compliant in the UK (South Africa requires them). The batteries BMS has built in protection i was told on the Facebook forum

Wouldn't do any harm to fit them.

Hey how are you Sunsynk Batteries? Would you recommend them

@@silkstar20 no issues so far

Electricians Meccano - Unistrut

@@efixx Cheers, was it difficult to do? Do you have any pics by any chance? Not my forte so considering just buying a cheap frame. Reckon a handyman could make a unistrut frame?

Thanks Sean - we need more sun and bigger roofs to go fully off grid!

@@efixx is there any regs or law that say we can’t go of grid ?

@@Dog-whisperer7494 No there is a house near me which didn't want electricity when they electrified the area in 1956, and today it would cost over £25,000 for the 11kv network to be extended - It's staying off grid.

Agreed 👍 - lots more on this subject coming

First time I’ve heard that one. Can’t think of anything inside a circuit breaker which makes it unidirectional? - will double check with our special guest on Wednesday

@@efixx ​ @eFIXX You need to check that breaker you've fitted on the battery, as it appears to be for AC. The data sheet makes no mention of DC, it does mention AC and 50Hz, AC breakers should never be used for DC - you mention this in the video, as the arc is much harder to break. The majority of DC breakers are directional, run power through them in the opposite direction and you could have a fire when they trip as the arc suppression is designed for current flowing the other way (search KZfaq for "Polarised Solar DC Circuit Breakers - Reverse Polarity"). On a battery the current will run in both directions. Its rather hard to find DC breakers that are "No Polarity" or "By directional", I used Z Beny breakers, as these are specifically designed for solar and battery systems, I also installed suitable T Class fuses to be extra safe. I'm a DIYer and built my Victron system, only employed an electrician for the AC side.

@Ian Stanley Yes that statement is correct, however you can get bi-directional, non polarised DC breakers, I used Z Beny in my build, but also fitted T Class fuses for extra safety.

Circuit breakers are tripped by heat using a bimetallic strip. The heat produced by the current passing through does not depend on current direction.

@@deang5622 LOL I strongly suggest you go and read up on how circuit breakers work, especially if you are working with DC or you could have far more heat than you ever expected!

5kWh, not 5kW. Battery capacity is measured in kWh, inverter power handling is measured in kW.

but you could still answer Catfaces question @@deang5622 2 x 5kWh fed at 5kW is two hours storage is that a rate of C = 2?

The Sunsync 5kW inverter can charge/discharge a max of 125A, so even for 2x100Ah batteries you can only draw 125A

So in the settings I can set it to 125a and that will max out the settings?​@@padraicberry8856

I certainly wouldn't advise it after seeing some videos of Tesla batteries failing.

These systems are LFP and don’t get thermal runaway. LFP one of the safest types of lithium chemistry

@@dvrn86 tesla is lifepo4 ???

In someone else's house!

@@PhilippeCJR Tesla is NMC for Powerwall and some of their EVs now LFP

We haven’t looked at micro inverters yet. Last time we checked Enphase didn’t have a battery solution.

I've used Enphase before on a mini DIY project, they are great micro inverters and as far as I can tell seem to be the only ones that are officially certified I think. The output wattage is limited. I have some cheapish Chinese micro inverters which work well with high output (linked to Shelley devices). Reading this week tho, I think none of these Chinese inverters are certified and you will not be able to get sign off by your local DNO, which in turn means you cant get paid for your export. I'm not 100% sure as I'm still learning. I'm now more leaning towards the victron Multiplus 2 low frequency inverters. They are more pricey but rock solid from my research. Enphase do offer a battery solution now also, but I don't think its been launched in the UK yet. The optional control unit from Enphase for the microinverters is about £350. From what I've been reading this week, if you want to feedback energy to the grid you then have to purchase this optional unit to keep DNO happy to get paid for the export.

@@stevengajek you thinking of putting cheap Chinese micro inverters on your roof under the panels ? Hope you got your own scaffolding and roofing kit. If its on the roof you don’t want to go there for 20 years. Personally that’s the reason I wouldn’t fit them. There are some advantages if you have shading issues

and firmware

We are trying to get an expert on lithium ion battery safety in the show in the coming months. Stay tuned later today for Joe looking at ac va dc isolation.

More demos on the way

Doesn't physically matter where the fuse is, the current is the same all the way around the circuit.

Here’s a sneak peek 🫣 there is a difference! kzfaq.info/get/bejne/j954dqeklZm5dZs.html

You can still benefit from traditional off peak tariffs such as Economy 7.

It is on the data sheet - chint.co.uk/wp-content/uploads/2022/11/DZ158-Datasheet.pdf

@@efixx ah, good stuff. It wasn't on the datasheet that I found.

You have to dig deep you had me for awhile thought I’d been tucked up by a solar distributor.

It’s built in to the inverter

@@efixx It does, can you refence this statement to a page in the manual?

Still lot of DC voltage after the inverter... If the positive cut in the solar string will it arc on the cement, galvanized iron(coated vs bare metal) and other roof materials???

Most the inverters we use have SPD’s built in for both DC and AC. They also have an alarm that registers the SPD activation. However their manuals also recommend fitting tour own external SPD’s. I imagine this is because it extends inverter lifespan and its easier to change your own SPD than call out an engineer for the inverter.

​@@efixx did you read the installer manual, you're meant to install an external spd

Actually Pi=3.1415926, often shortened to 3.14, but never down to 3.0

@@deang5622 "Pi is exactly _3!"_