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building my PerformanceWall
#1
Iam gonna build my own big battery (what else should you expect on a forum like this Wink  ) 

I have already purchased a bunch of spacers for 18650 batteries..
   

Ive browsed/read some topics here and see al lot of (normal?) batterychargers.

At this moment i own 12Solarpanels which provide ~3000W per hour, for example it gathered more than 18kW today.
Which size of pack should i build for my house? Is there a standard rule for, it's not my intension to deliver power back to the grid(for money)
I saw 24v and 48v and there pro's and cons..

What will happen on a day like today with 18-25kW Solarpower with for example with a 5kW battery, where's the rest of the power going to? Does a BMS direct the power o the grid?

We use ~230V at 50Hz here in the Netherlands
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#2
Bms only manage the battery. you need a hybrid system that can backfeed the grid. They cost more and you need approval to run Them since they are grid tie. You can take a look at My system as example
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#3
Thx for your answer, iam going to read your topic.

At this moment the panels/system is feeding the grid when i don't use all the power so i think i can just place the battery between the inverter and the grid?
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#4
Only IF the inverter is made for battery. Of not you have to rebuild it and in worst case swap out all electronics
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#5
(04-21-2019, 06:38 PM)Vdub_nl Wrote: At this moment the panels/system is feeding the grid when i don't use all the power so i think i can just place the battery between the inverter and the grid?

If you have a recent SMA, Fronius or ABB inverter your existing system can remain as is - unless you want to limit the maximum output of your system to that of the battery connected inverter the new system will be connected parallel to your existing, supplementing/minimising grid usage.
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#6
We have a SAJ Sununo TL3KB inverter, single phase.
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