Lets say you have an 8Kw Sunsynk inverter and are looking for 10Kw of battery backup. Which is better 1 x 10Kw battery or 2 x 5Kw batteries. Does this still hold true for say 15Kw (1x 15 or 3 x 5) and 4 x 5 for 20  or 2 x 10 or 1 x 20. Just trying to see which is better. My thinking is more batteries more cables which are not cheap, but on the other hand, if 1 battery gives issues you don't lose your entire battery backup.

Pros and Cons to both

Like you mentioned, with 1 larg(er) battery - if there are issues then its likely your whole bank is gone. But then you run less cables / trunking and potentially takes up less space

With multiple you have the reverse of the above. 

I couldn't get a single large 9.6kWh when i got the system installed so currently have 2x4.8s

Other thing to keep in mind is the differing warranties on different battery specs. For example, the 2.4 and 3.5 Pylons have a 10 year warranty while the 4.8 is only 5 years. 

2 hours ago, Greglsh said:

Lets say you have an 8Kw Sunsynk inverter and are looking for 10Kw of battery backup. Which is better 1 x 10Kw battery or 2 x 5Kw batteries. Does this still hold true for say 15Kw (1x 15 or 3 x 5) and 4 x 5 for 20  or 2 x 10 or 1 x 20. Just trying to see which is better. My thinking is more batteries more cables which are not cheap, but on the other hand, if 1 battery gives issues you don't lose your entire battery backup.

I would say the better would be 1 there are pros and cons. I had a 5kw batt and changed to 1 x 15Kwh running a SunSynk 8K.

If finances allow, go for the single biggest battery you can afford. I know of someone with a "Freedom Won Lite Commercial 100/80" battery at home.

When the Freedom Won guys came to install it, they said it was the biggest Home install they have done. 🤣

45 minutes ago, TimCam said:

If finances allow, go for the single biggest battery you can afford. I know of someone with a "Freedom Won Lite Commercial 100/80" battery at home.

When the Freedom Won guys came to install it, they said it was the biggest Home install they have done. 🤣

What size solar array does he have to charge?

1 minute ago, Buyeye said:

What size solar array does he have to charge?

He has a 3 phase setup with 6 inverters and many panels.

I don't want to say too much, as it's not my setup.👍

thats crazy for a home install, I bet there's a story there, one of those over the top types, ending with "I'm never using Eskom again!!!"

alternatively its a plot/farm and there's a business running there which explains it easily.

Edited March 9, 20224 yr by Nitrious

6 minutes ago, Nitrious said:

thats crazy for a home install, I bet there's a story there, one of those over the top types, ending with "I'm never using Eskom again!!!"

alternatively its a plot/farm and there's a business running there which explains it easily.

The battery alone cost more than most peoples entire solar setup. 😲

5 minutes ago, TimCam said:

He has a 3 phase setup with 6 inverters and many panels.

I don't want to say too much, as it's not my setup.👍

No stress, the extremes are always more exciting to read about. I'm already wondering if he gets 10kw solar peaks on overcast days.

3 minutes ago, TimCam said:

The battery alone cost more than most peoples entire solar setup. 😲

I'm aware, he must have had a really really good reason, and I always enjoy a good story

decided to assume it was far more important than some blowout with Eskom, hence the business suggestion.

Edited March 9, 20224 yr by Nitrious

I was trying to say though, that cells in any battery can be replaced if it comes to it, and they aren't immediately trash the second a cell gives out.

 

1 minute ago, Nitrious said:

I was trying to say though, that cells in any battery can be replaced if it comes to it, and they aren't immediately trash the second a cell gives out.

 

Yip, and good warranties on batteries are important.

they all lie, in full disclosure I've been assisting bobster since nov/dec with his 2.5 yr old battery install.

I've never ever seen so many tricks being pulled out to deflect blame/claim ever, and its under a 10 yr warranty btw.

No I didn't install it, or had anything to do with it really, except provide guidance on getting the warranty fulfilled and in depth knowledge so he wasn't getting the wool pulled over his eyes, its still going on. At least its finally coming to some kind of closure though, every step included challenging the stated data, the current stance at the time. You'd think it was a international negotiation.

I can only say, you think you have a warranty until you try and get it actioned, then every excuse comes out under the sun. yes its a good, well known, locally supported brand.

Edited March 9, 20224 yr by Nitrious

Yes, it's unfortunately the same in many markets. Send your vehicle to the wrong place for a service, and bang goes the warranty.

Don't maintain your Roof structure properly, and the house burns down due to nothing to do with the roof, the insurance won't pay.

Get the wrong installer to install your battery, and no warranty.

It doesn't seem fair, but looking from the other side, sometimes people do take chances.

in this case, everything but everything was done by the book, approved installer, owner didn't touch anything or interfere with settings. manufacturer consulted at every turn, before the battery went in for repair, so it goes on.

I'm sure there are very good experiences out there however, I'm only mentioning a particularly trying one which doesn't indicate a trend, merely a singular indicator at best.

So yes, under all circumstances ensure your warranty is upheld under any and all circumstances in which you operate, regardless of market.