I have had a 15kw solar system installed December 25 and it has a Deye inverter and 15kwh battery

As my PEA consumption is going up to around 15units each evening from 5pm -8am I looked at adding an extra 15kwh battery but told with all fittings/stand as outside it will be 96k

I thought maybe 70k maximum?

Also probably could do with a 20-30k kwh Battery as 15kwh won't cover the consumption and when it gets hotter the ac's will drain even more.

I have seen before people saying it's simple to do just 2 wires?

Is it that easy as I am sure a Deye battery is nowhere near as expensive as they are charging

Exactly which inverter and existing battery pack do you have.

It CAN be as simple as two wires, but it's not always.

It's always worth re-doing the charger load calculations.

The reason I say that is because of things like isolator switch rating.

I'm in the process of doing just that myself.

My existing switches are old and, in some cases, well and truly knackered.

After upgrading my panels some time ago, about a year I think,

I now have loads more amps in places where they weren't before and it shows.

3 hours ago, Crossy said:

Exactly which inverter and existing battery pack do you have.

It CAN be as simple as two wires, but it's not always.

Hi Crossy
We have a Deye SE-F16 16kw battery

A Deye hybrid inverter SUN-16K-SG01LP1-EU

I was going to attempt a diy solar install but very happy with how they installed this.
Would love to add a 20/30 kw battery as the 16kwh battery turns off around 11pm when it goes to 20% and we are now using around 15 units from PEA which isnt the end of the world but if i can install a battery myself it would be a bonus
Just seen the Deye SE-F16 16kwh battery is around 60k so almost 40k with cable /stand and breaker

Please could you post clearer images of the rating plates.

I can't read the text when zoomed.

1 minute ago, Crossy said:

Please could you post clearer images of the rating plates.

I can't read the text when zoomed.

I was just checking the images and they are clear until i upload them i will try to drag files as they seem to compress them when i upload

OK still not clear but the SUN-16K-SG01LP1-EU is designed for 48V battery systems.

So pretty well any 16S LiFePO4 pack can sit in parallel with your existing.

Do please verify the battery pack type you have (can't read the label).

Looks to be a decent instal you have there 😊

Are you uploading from your phone or a PC?? If it asks thumbnail or full image select full image.

I really have no idea what's going wrong with the image uploads.

Just screenshot the images and attached to the post above
Clearer but not perfect

13 minutes ago, Crossy said:

I really have no idea what's going wrong with the image uploads.

OK clearer
Screenshot seemed to work but still not perfect

OK confirmed that's a 16S pack.

There are loads on lazada that will work, some of better pedigree than others.

A mate bought one from LVtopsun recently and is most happy with the beast.

Have a look and post the one you are thinking about.

46 minutes ago, Crossy said:

OK confirmed that's a 16S pack.

There are loads on lazada that will work, some of better pedigree than others.

A mate bought one from LVtopsun recently and is most happy with the beast.

Have a look and post the one you are thinking about.

I would prefer to keep with DEYE but probably no difference
LVtopsun would be ok with Deye inverter?

Would probably go for a 30kwh as if we are using an average of 15kw+ an extra 15kw from PEA during non solar hours having a 15kw battery + a new 30kw battery would mean i can set them to go to maybe 30% rather than 20% or would this not make a difference?
maybe charge them to 80-90% rather than 100%?

To be honest any recommendations would be good as not got much of an idea which battery is a good pedigree and i expect i would choose the wrong one

Many thanks and how easy would it be to install ?
Feel like i might need someone to fit it unless there is a good youtube video?

I've a 20kW Deye and a LVTopsun battery, work together.

57 minutes ago, carlyai said:

I've a 20kW Deye and a LVTopsun battery, work together.

Now this is exactly what i am wanting to do.

Did you add the LVTopsun battery yourself?

Trying to see how difficult it would be to add the extra battery

IIRC LVtopsun actually make/made packs for Deye.

Whether the packs will actually communicate with each other is debatable but that matters not in reality. So long as one pack can talk to the inverter everything will sort itself out.

Connect the packs in parallel + to + and - to - (check they are within 0.25V or so or you'll get some large currents flowing as they balance) with nice fat wires (same size as your existing battery to inverter) and you're good to go!

12 hours ago, kwak250 said:

Now this is exactly what i am wanting to do.

Did you add the LVTopsun battery yourself?

Trying to see how difficult it would be to add the extra battery

I mainly watched.

@kwak250 the imige quality issue is not your fault ,it doesn't matter how clear or high quality an image you upload the forum software loslely compreses the image to save space is suppose,but in doing so the details are lost...I moaned about this over a year ago when I was trying to share a new immigration form...but was told 'it was not an issue'

so gave up trying.

They also stopped allowing PDF and Zip file uploads which is a pain too.

Just got our PEA bill today

628 baht

Is the Deye app quite far out with import figures as this month alone its showing 225kwh but got charged for 164 kwh

The cycle starts around 22nd of the month so I was guessing I used around 300 kwh ?

Not complaining just don't understand if the Deye cloud is giving incorrect data?

Fitting a new battery might cost around 60k70k

That would take 9-10 years .

Sorry I can't help you with bill analysis yet as waiting on PEA approval before system is handed over.

I do have the Deye graph like you but I'm just letting it hum along. Only been a week since PEA application.

Did you get PEA approval?

Seemed a bit sus. as engineer said B5000 for 5kW inverter, B10000 for 10kW inverter and B20000 for 20kW inverter.

I got it down to B15000 and spose to be done in a week.

What did PEA cost you?

35 minutes ago, carlyai said:

Sorry I can't help you with bill analysis yet as waiting on PEA approval before system is handed over.

I do have the Deye graph like you but I'm just letting it hum along. Only been a week since PEA application.

Did you get PEA approval?

Seemed a bit sus. as engineer said B5000 for 5kW inverter, B10000 for 10kW inverter and B20000 for 20kW inverter.

I got it down to B15000 and spose to be done in a week.

What did PEA cost you?

The company we used said we can get approval through them for 10k baht for our 15kw inverter as they know someone who works there and they don't need to check but said it wasn't necessary at the moment and you can do it anytime.

Not sure about that but for now I will leave it as it is and getting a bill for 6-700 baht a month will probably look normal.

Maybe o.should look into registering but the company we used said they have installed 100's of systems and very rarely does anyone want to register

I suppose as long as you have a digital meter and are not exporting back to the grid it wouldn't matter but could mine be doing this as the import units used on deye cloud are certainly higher than the PEA bill charged ?

For me I want to sell power back to PEA so this is the final hurdle.

So we'll just let it hum away with my electrician friend monitoring via Deye Cloud and our camera setup as we're off overseas for a couple of months.

We've found our inverter readings are often rather different to what the PEA meter says.

Since it's the PEA one that matters that's all we worry about, the inverter is just a sanity check.

In reality we are mostly off-grid anyway and the grid breaker is mostly turned off, I just turn on for a few nights before the meter man comes to keep our whizzy-disc meter moving forwards.

1 hour ago, carlyai said:

For me I want to sell power back to PEA so this is the final hurdle.

So we'll just let it hum away with my electrician friend monitoring via Deye Cloud and our camera setup as we're off overseas for a couple of months.

I also thought about this but our installer said he knows people still waiting from 2 years ago.

Not sure if this is still an isuue?

Might look into it if its possible.

Export meters do seem to be low-priority!

Stupid really as it's just slightly different programming of the electronic meters.

And, of course, if you get spotted spinning your old meter backwards ...

Just don't get caught!

45 minutes ago, Crossy said:

We've found our inverter readings are often rather different to what the PEA meter says.

Since it's the PEA one that matters that's all we worry about, the inverter is just a sanity check.

In reality we are mostly off-grid anyway and the grid breaker is mostly turned off, I just turn on for a few nights before the meter man comes to keep our whizzy-disc meter moving forwards.

Our old house still had the whizzy disc.

Unfortunately our new house got fitted with a new digital version.

Still nice to only be paying 600 baht a month .

13 hours ago, Crossy said:

Export meters do seem to be low-priority!

Stupid really as it's just slightly different programming of the electronic meters.

And, of course, if you get spotted spinning your old meter backwards ...

Just don't get caught!

I got caught, my punishment? They said "You're a naughty boy, please don't do it again". All smiles and off they went.

21 minutes ago, JBChiangRai said:

I got caught, my punishment? They said "You're a naughty boy, please don't do it again". All smiles and off they went.

Haha that will teach you.

We had someone opposite our old house that was running his house free by adding a wire from the main cables

The electrician from PEA came to check then got the owner out and told him to remove the cable.

That was it !

Lucky I reckon

2 weeks later his mate is up the top of the mango tree at 2am putting a new bypass cable up.

Should of got him to do mine ,saves on solar install.