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New Solar Setup Questions

Featured Replies

Finally going ahead with my house solar installation.

Can't do it on my own, so getting the help from a Thai communications/electrician friend who installs solar systems. He's really the one doing all the work as my back has gone again. 😞

In the process of ordering the hardware.

The inverter: DEYE SUN-30K-SG01HP3-EU-BM3.

My battery choice: BOS-G. HV. 5.12kWh. 51.2v.

Would need a minimum of 4 modules to get within the inverter voltage range of 160-800v.

 

My Solar Installer recommended (before I came up with the BOS-G): LYPOPSUN, battery Lithum 51.2v 200Ah LIFPO4, LVTS-512200-63.

From what I've read you need to pair the 30kW inverter with HV battery input.

He has installed 30kW systems before and I haven't.

At the moment he is checking on my battery suggestion.

 

What do the learned people on this forum recommend for the battery?

 

30kW system is probably over-the-top but we have intermittant current use of: EV charger, 2 multi point 3 phase water heaters, pool (2HP) and chlorinator, irrigation pumps, aquaponics pumps and plans for solar pool heater and electrical sauna.

 

Do be aware that the big Deye unit needs a battery voltage of somewhere between 160-800V (at least 360V for full power) which severely limits what packs/BMSs you can use.

 

Personally, for a DIY system I'd stuck with several smaller units that can use the readily available "48V" packs which have the advantage that they won't turn you into a pre-cremated body at your funeral.

 

But as with all things that's UP2U.

 

Please note that you cannot just put several 48V packs in series without risking fatal damage to their BMSs unless the BMS is specifically rated for high voltage use.

 

 

"I don't want to know why you can't. I want to know how you can!"

And what kind of panels do you recommend? Can a mix be a good solution ? What is your experience ? 

 

The "best" solar panels for Thailand depend on your priorities, but 

monocrystalline panels are often recommended for their high efficiency, especially in direct sunlight. However, for Thailand's high heat, some experts suggest polycrystalline panels may offer more stable performance, despite being slightly less efficient overall. Popular and reliable brands that are good options include LONGi, JinkoSolar, and AIKO

  • Author
25 minutes ago, Crossy said:

Do be aware that the big Deye unit needs a battery voltage of somewhere between 160-800V (at least 360V for full power) which severely limits what packs/BMSs you can use.

 

Personally, for a DIY system I'd stuck with several smaller units that can use the readily available "48V" packs which have the advantage that they won't turn you into a pre-cremated body at your funeral.

 

But as with all things that's UP2U.

 

Please note that you cannot just put several 48V packs in series without risking fatal damage to their BMSs unless the BMS is specifically rated for high voltage use.

 

 

Thanks for the reply, but I don't understand.

So you wouldn't use any of the two 51.2v modules I asked about.

  • Popular Post

@carlyai

We have the single phase version of the battery installer recommends, and happy with them.  One did have an oops, and was replaced under warranty.  We only use 500-1000kWh a month, so 8kw inverter and two 10kWh ESS is more than enough for us.  Only 2 of us, and basically off grid, though still connected, JIC  inverter craps out.

 

The original ESS has 500+ cycles so far and 3+ years (Aug 2022) use.   Depending what study you read, LFP will last 2500 to 10k cycles, and retain 70%.   On the negative side of that, 15+ yrs for us.

 

Even at 70% (14kWh), wouldn't be an issue for us, as we rarely use 8kWh overnight.

 

30kW sounds like a lot, but depends how much you use every month, or what daily use will be.  We've only max'd out the 8kW inverter once ... oops.   

 

AC's on, baking, water pump, BEV plugged in @ 2.3kWh (I forgot), and I decided to take a hot 3.5kWh shower ... :cheesy:

 

2 better than 1DN.jpg

  • Author
16 minutes ago, KhunLA said:

@carlyai

We have the single phase version of the battery installer recommends, and happy with them.  One did have an oops, and was replaced under warranty.  We only use 500-1000kWh a month, so 8kw inverter and two 10kWh ESS is more than enough for us.  Only 2 of us, and basically off grid, though still connected, JIC  inverter craps out.

 

The original ESS has 500+ cycles so far and 3+ years (Aug 2022) use.   Depending what study you read, LFP will last 2500 to 10k cycles, and retain 70%.   On the negative side of that, 15+ yrs for us.

 

Even at 70% (14kWh), wouldn't be an issue for us, as we rarely use 8kWh overnight.

 

30kW sounds like a lot, but depends how much you use every month, or what daily use will be.  We've only max'd out the 8kW inverter once ... oops.   

 

AC's on, baking, water pump, BEV plugged in @ 2.3kWh (I forgot), and I decided to take a hot 3.5kWh shower ... :cheesy:

 

2 better than 1DN.jpg

Thanks for the reply.

Our monthly power bill is B5000 and I've got my aqaphonics turned off.

🙂

 

 

 

 

 

8 minutes ago, carlyai said:

Thanks for the reply.

Our monthly power bill is B5000 and I've got my aqaphonics turned off.

🙂

On single phase, 5k would be a wee bit more, than our highest use at 1000kWh a month.  1100kWh being ā¸ŋ5200

 

https://eservice.pea.co.th/EstimateBill/

 

1 hour ago, Hummin said:

And what kind of panels do you recommend? Can a mix be a good solution ? What is your experience ? 

 

 

The "best" solar panels for Thailand depend on your priorities, but 

monocrystalline panels are often recommended for their high efficiency, especially in direct sunlight. However, for Thailand's high heat, some experts suggest polycrystalline panels may offer more stable performance, despite being slightly less efficient overall. Popular and reliable brands that are good options include LONGi, JinkoSolar, and AIKO

N-type bifacial split mono is all I want to use now.

 

N-type is best for use in the hotter countries

Split if you have any shadows

Bifacial for situations where light can reflect from underneath.

Mono for better production in lower light (early morning, late afternoon, and cloudy days)

1 hour ago, carlyai said:

Thanks for the reply, but I don't understand.

So you wouldn't use any of the two 51.2v modules I asked about.

It's the 5.12Kwhr that's too small, you'll need much more storage.

And the 51.2v isn't really stackable in series to give you a higher voltage.

2 minutes ago, BritManToo said:

N-type bifacial split mono is all I want to use now.

 

N-type is best for use in the hotter countries

Split if you have any shadows

Bifacial for situations where light can reflect from underneath.

Mono for better production in lower light (early morning, late afternoon, and cloudy days)

And how does it looks like for the next coming years. I guess we will not start before next year start installing a complete off grid system with grid as an option, and my question is, will be worth waiting 2 years for better panels, prices or ? 

13 minutes ago, Hummin said:

And how does it looks like for the next coming years. I guess we will not start before next year start installing a complete off grid system with grid as an option, and my question is, will be worth waiting 2 years for better panels, prices or ? 

Who can tell,

3 years back 340w (3kbht) poly panels were the bees knees

Today 600w (2kbht) mono, x, x, x ....... 2x the output at 2/3 the price.

Batteries and inverters 1/2 the price of 3 years back.

 

And nobody ever suggested my 340w panels would be obsolete today or the 20 year guarantee wouldn't be honored.

And you can't buy any more, because next year they won't be on sale, and don't mix with newer panels easily. 

 

5 minutes ago, BritManToo said:

Who can tell,

3 years back 340w (3kbht) poly panels were the bees knees

Today 600w (2kbht) mono, x, x, x ....... 2x the output at 2/3 the price.

Batteries and inverters 1/2 the price of 3 years back.

 

And nobody ever suggested my 340w panels would be obsolete today or the 20 year guarantee wouldn't be honored.

And you can't buy any more, because next year they won't be on sale, and don't mix with newer panels easily. 

 

Thanks, 

1 hour ago, carlyai said:

So you wouldn't use any of the two 51.2v modules I asked about.

 

Battery systems designed for series connection.

 

If you connect several 51 volt battery modules in series and each module has its own BMS then each module BMS will only see its local 51 volts. The series connection will make all modules pass the same current so they must be able to handle this and also communicate data between each other and the master charge control.


The Deye HV BOS-G battery has been designed for series or parallel connection so its a good choice for inverters that require high voltage storage.


I like your choice of equipment but imagine the total cost will be quite high. There are smaller Deye versions available that use the same high voltage storage. 
 

1 hour ago, carlyai said:

Thanks for the reply, but I don't understand.

So you wouldn't use any of the two 51.2v modules I asked about.

 

The Deye HV units can stack, but you will be limited to sticking with the same type if you want to increase capacity.

"I don't want to know why you can't. I want to know how you can!"

  • Author
50 minutes ago, BritManToo said:

It's the 5.12Kwhr that's too small, you'll need much more storage.

And the 51.2v isn't really stackable in series to give you a higher voltage.

No I need 4 modules to start.

11 minutes ago, carlyai said:

No I need 4 modules to start.

Price for 4?

Thinking expensive.

  • Author
2 hours ago, BritManToo said:

Price for 4?

Thinking expensive.

I think around B30000+

32 minutes ago, carlyai said:

I think around B30000+

 

120k for four batteries + inverter + panels + etc = likely going north of 400k.

 

It would create a tidy system with low current more efficient conversion on the battery side but the price is hard to swallow when you look at the alternatives.

 

@Crossy idea of small units might be a better solution which could be done by dividing your plan into two. The result might even be more efficient.

 

Be interesting to know how you arrived at needing a 30kw system. Planning short term scalable solar system is often a better solution than jumping into the deep end.  
 

  • Author
2 hours ago, Fruit Trader said:

 

120k for four batteries + inverter + panels + etc = likely going north of 400k.

 

It would create a tidy system with low current more efficient conversion on the battery side but the price is hard to swallow when you look at the alternatives.

 

@Crossy idea of small units might be a better solution which could be done by dividing your plan into two. The result might even be more efficient.

 

Be interesting to know how you arrived at needing a 30kw system. Planning short term scalable solar system is often a better solution than jumping into the deep end.  
 

Thank you.

I read in some literature it is best to use HV input with the DEYE 30K inverter.

The batteries come in 5Kv modules, aren't they smaller units.

Can you explain what you mean by smaller units.

Is it starting with a 20kV inverter, and 48v batteries, that aren't recommended?

49 minutes ago, carlyai said:

Thank you.

I read in some literature it is best to use HV input with the DEYE 30K inverter.

The batteries come in 5Kv modules, aren't they smaller units.

Can you explain what you mean by smaller units.

Is it starting with a 20kV inverter, and 48v batteries, that aren't recommended?

 

I like the idea of high voltage batteries because it makes so much sense for the conversion electronics. What I don't like is the huge cost involved. 


Smaller units :-

 

Why not build with two Deye 15kw three phase inverters that allow cheaper low voltage batteries. You could plan to install two but start off with one and see how the capacity fits in with your consumption.

 

The power wall video I posted in a previous topic of yours shows the Deye three phase inverter using two low voltage 15kw batteries at $1000 each. 
 

  • Author

I think my installer has already ordered the inverter and panels, just waiting on time to decide the best battery choice.

What I didn't want was to do some welding or use the 3 phase car charger or 2x 3 phase water heaters and have to use the grid.

I think I have gone over-the-top but apart from the cost, is there a disadvantage to having an over-spec. installation?

I just want the solar system to hum away without me having to think about upgrading.

I have put aside B450000 for the project, maybe not enough.

I was going to get one quote, but they were reluctant to come as they said the installation cost would start at B500000.

I have never worried about ROI or I would never have built a house in Issan with associated rice and tapioca farms.

My EV has an 8 yr warranty and so will the solar I think which will make me nearly 90 yrs old.

 

3 hours ago, carlyai said:

I think my installer has already ordered the inverter and panels, just waiting on time to decide the best battery choice.

 

Appears your path is set, be sure the battery you choose is 100% compatible with the inverter, Deye most likely has a list.

  • Author

With thoughts from your replies, thanks very much, I contacted my solar guy and asked if we could maybe cancel the order and go back to my origional idea of installing everything in the garage and using a smaller inverter built around the amount of panel we can install on the garage roof. So he's redesigning around 10 to 20 kW inverter.

The problem with installing everything in/on the house as still need to get feeds to the garage for the EV charger.

He's happy ?? to go with smaller order.

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