Hello from The Netherlands (Arnhem)

Hi there,

A few weeks ago, I started to think about storing power. At this moment I have 14 PV panels which deliver me a maximum 3kWh. All that they produce minus our usage, will flow back to the grid. In case we the sun is down we have to use the grid. I think you know how it works.

Because I have zero knowledge about electrics and so on, I began to view the various YouTube channels. And I got exited about this.

At this moment I am collecting, and processing18650 cells. From work I obtained about 50 old laptop batteries, I local computershop donated 25 to me. Also I have bought some new cells (Samsung) and some other old laptop batteries. I'm expecting this week about 50 old Dell batteries (9-cells), hopefull I can reuse a lot of them.

After soldering and testing, I hope to aquire some simple, small PV panels for dedicated purposes.
My first plan is to setup a small powerwall. 7s72p for now and bought some things from AliExpress.
Here's my plan:





Questions I have:
- does this make sense to you?
- what kind of devices do I need extra?

Thank you!

Maarten

Welcome!

It makes sense. I would though
* Make sure to use a good enough MPPT charger instead of the one you had on the image.
* Insert breakers/fuses on every part ie inverter, battery and solar.

You panels btw are rated in kW not kWh kWh is the unit for energy over time. Even though you can calculate the energy over time from panels thats not how you rate them.

Welcome!

ClardiPower said:

- does this make sense to you?
- what kind of devices do I need extra?

Click to expand...

It does! However, if this is a picture of your actual solar charge controller then I would change that to a proper MPPT model, just as daromer said.
Whether or not you need some extra devices depends on what you want to do. I guess over time you will find that you can always make use of this or that. For the start you don't strictly need any more devices.

daromer said:

kWh is the unit for energy over time.

Click to expand...

It isn't, there is no such thing as energy over time Energy is inherently over time because power over time is energy

Hi daromer and DarkRaven,

Thank you for your welcome!

My intentions are first to start a 'cheap' configuration and get more experience with it and get some confidence in it. That's why I choose this solar charge controller. The breaker/fuses are planned between every device in my picture (I did not draw them), and I am still looking what breakers/fuses I can use in my setup.

daromer said:

* Insert breakers/fuses on every part ie inverter, battery and solar.

Hi Daromer,

Click to expand...

What kind of breakers/fuses would you recommend me?

Thank you

Maarten

DarkRaven Yeah you are correct.

The fuses/breakers need to be made for the voltage and current going through!

Instead of me pasting in tons of different types here I have created a start-list for such systems: http://diytechandrepairs.nu/complete-solar-best-buy-list/

I just copy paste the links here so they are Ebay links:
Battery switch https://goo.gl/eFftC4
Fused battery breaker. Can also be used for panels: https://goo.gl/rqWfy3

But check out my list. Im working on it and before end of this year my current setup will be represented there as well.

Also link in a Swedish site:http://www.solelgrossisten.se/product/list/dc-komponenter/273
This one have most of the DC components I use. I have yet not had time to look them up on Ebay/Amazon or equal site.

/D

Thank you very much!

Also HBpowerwall have a very good list. He have very good breaker/fuse boxes. Depending on area they would be better. Where I live they kind of doesnt exist.