PV Options Advice

[vma]

Hi guys, I am looking for some advice in choosing one of these 2 options

Option 1:

• 6kw Polar S Hybrid Inverter for 2 strings
• 4 Tigo Optimisers on the garage roof for shading issues
• An additional 3.6kw Solax String Inverter connected directly to the grid for the 3rd string
• Total system capacity: 9.6kWh (6kWh + 3.6kWh)

Option 2:

• Single 6kw Polar S Hybrid Inverter
• Both garage roofs are on 1 string
• 12 Tigo Optimisers are required due to different roof orientations
• Total system capacity: 6kWh

Common elements:

• 21 x 435w Jinko N Type All Black Panels
• 5 x 5.2kwh Batteries = 26kwh Total Capacity
• Same price for both options

[Dillsue]

Have you asked your DNO if you can have either or both options?

[Mr Blobby]

As said above, your DNO may not like your plans.  Single phase?

You can buy now buy a hybrid inverter with more than two strings for more than two elevations. Although I note you also have shading issues so looking at optimisers.

Edited June 24, 2024 by Mr Blobby

[Jinglish]

Fox do a triple MPPT invertor I would consider this...

https://theecosupermarket.co.uk/product/fox-k-series-7-0kw-hybrid-inverter-kh7/

It is on the DNA register so could be applied for via G99 "fast track" which should be very quick to get DNO approval (7.36kW is the limit for fast track)

 

Polar brand doesn't appear to be listed on the DNA so either of your options you might have to jump through a lot of loop with a G99 "standard" application.

 

Strongly consider the payback for 5 x 5.2kWh batteries. IMO V2G or V2H is a only a few years away of becoming more mainstream which will almost supersede the need for house batteries.

Edited June 25, 2024 by Jinglish
Linked 8kW instead of 7kWh

[frankmcs65]

Hi there,it's a bit a trickey one,as we don't know your requirements/usage of energy.How many are there in your household and what is your electrical equipment like....Also we don't know the inverter specs,string voltage and so on....I've gone 99% off grid with a DIY Lifepo4 34KW storage and two strings bifacial panels with a max. of 8.5KW.I've over the years reduced heavily the single electric equipment usage,everything what used to eat more then two KW now uses half or even less.So,maybe if you decide to go (mainly) off grid you might go rather towards solution two with some improvements.Also I'm not a great fan of optimizers,if you're able to avoid them because they can complicate things even more,while a neet and tide setup helps to keep run things smoothly....I would suggest an inverter with a minimum of two mppt's,even three,if you can,to leave options open....Looking of the possibility of amount of panels,it would suggest a good range mppt...Mine for examle goes to 500V and 17A per string.Don't rush into things,make your mind up in base of your needs......cheers Frank and everyone a happy and collectful new year🥰

[SteamyTea]

The original poster has not been back on here to check any answers, they only asked one question, then vanished (back in June)

 

  

3 hours ago, frankmcs65 said:

34KW

 

3 hours ago, frankmcs65 said:

KW

 

It is kWh for storage (the energy) and kW for the generation (power).  A lower case k, for kilo, 1000, not an upper case one, that is for temperature (kelvin, not Kelvin, that is the man it is named after).

May seem minor, and a bit anal, but actually quite important to save confusion.

Edited January 3 by SteamyTea