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Tim's basement (filled) with powerrack(s)?
#1
Hello

This winter i actually start to build my own version of the powerwall.

The idea is that i can charge my plug in hybrid car from green home made solar energy.

In winter i wont have enough and in summer i will be running the entire house on this system.

The hybrid uses around 75-100kWh every week.
That means i need to average 10kWh every day. Makes close to 4000kWh every year of solar production.

I need some help with a few aspects but submit and follow me in this journey with ups and downs.

The first video is already online. And the second one will be uploaded this years. Verry maybe even a 3th one.

Here is the first video. It was a single shot without editing.


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#2
First few questions:

1. What is the best solution:
- glass fuse top and bottem solderd
- thin wire as a fuse top and bottem solderd
- wire or glass fuse on top side solderd and nikkel strips spot welded on negative side?
- spot weld top and bottem

2. I see that most 48Volt systems run 14 cells in serie. Why not 15 cells? The inverter and solar charger can accept up to 66 Volt and 15 x 4,2 = 63Volt. I will limit it to 60Volt for longer life of the 18650 cells

3. What capacity should I install if I run an 8000W continue system (2 times 5000W invertert) that can have peak for short time of 20 000W? Typical loads are 3500-4000W for a few hours. Not much peak loads. Verry few times it will hit 6500W. But that is for only 15 minutes.

I was thinking to go to 3 times 15s80p that means a capacity of around 27 kWh to start with.
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#3
Do you have the means to generate in excess of 10kWh/d ?
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#4
Yes. The solar charger that i plan on buying can handle 4800wp. I will be installing between 4500 and 5000wp. So in summer it wil generate +/_20kWh.
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#5
I can't say I was impressed by your video Tim .... all you did was a assemble a table !!!

You need to explain the bigger picture ... How many solar panels have you got , Are they on your roof ???

What are your driving habits ??? If your car is only used at night you don't need a powerwall , just charge the car directly while it's parked at your house during the day ....

Explain everything , it could save you a lot of wasted time. ....is grid electricity cheaper at night??
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#6
(12-16-2018, 01:24 PM)ozz93666 Wrote: I can't say I was impressed by your video Tim .... all you did was a assemble a table !!!

You need to explain the bigger picture ... How many solar panels have you got , Are they on your roof ???

I figured he's planning on showing the "whole" process. From nothing, to something, to finished. Even the basic stuff he's covering (assembling of the table for example) he's making fun and entertaining.
Perhaps he will explain why he choose each component and the reasoning behind each choice.

I hope that we don't have to wait weeks for the next video, tho. Altho, I understand that life things can inhibit production. Hopefully everything will progress smoothly Smile
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#7
(12-16-2018, 01:24 PM)ozz93666 Wrote: I can't say I was impressed by your video Tim .... all you did was a assemble a table !!!

You need to explain the bigger picture ... How many solar panels have you got , Are they on your roof ???

What are your driving habits ??? If your car is only used at night you don't need a powerwall , just charge the car directly while it's parked at your house during the day ....

Explain everything , it could save you a lot of wasted time. ....is grid electricity cheaper at night??

Right now i only have 1450 cells tested and put in holders. Around 2000 cells u tested. And 161 laptop batteries. And BIG plans.

I have a roof where the south side is just big enough for around 4500wp of solar panels. Those and the electronics will be bought right after the winter.

Right now i need to solder the packs together and keep testing and collecting cels.

As of the first day of 2019 i will start with the roll in leadership at my work so there is a lot of time in preparating that and also preparations of christmas and new year.

My girlfriend who lives with me is currently until end winter following in the eavenings lessons. So i need to do more of home stuff.

I work in a full continue system. So i have early shifts, late shifts and night shifts.

Here in Belgium we need to pay taxes if we have gridconnected solar pannels. And those taxes are around 70% of what you save in electricity. In a few years they change our meter to a 'smart' meter and then you sell your electricity for almost free and pay the full stuff when you take it back. During night and weekends our electricity is cheeper then during piek hours (day hours).

I hope that I answered all the questions. If not, please reask. Thanks

(12-16-2018, 02:01 PM)Korishan Wrote:
(12-16-2018, 01:24 PM)ozz93666 Wrote: I can't say I was impressed by your video Tim .... all you did was a assemble a table !!!

You need to explain the bigger picture ... How many solar panels have you got , Are they on your roof ???

I figured he's planning on showing the "whole" process. From nothing, to something, to finished. Even the basic stuff he's covering (assembling of the table for example) he's making fun and entertaining.
Perhaps he will explain why he choose each component and the reasoning behind each choice.

I hope that we don't have to wait weeks for the next video, tho. Altho, I understand that life things can inhibit production. Hopefully everything will progress smoothly Smile

Yes. I aim making a full covering entertaining video playlist on youtube. So i and others have fun. I post all my succeses and failers so it is fun and a learning proces.

Befor next weekend there will be uploaded the next video. Part 2 of the preparations ?
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#8
(12-16-2018, 03:04 PM)TimBelgium Wrote: Here in Belgium we need to pay taxes if we have gridconnected solar pannels. And those taxes are around 70% of what you save in electricity. In a few years they change our meter to a 'smart' meter and then you sell your electricity for almost free and pay the full stuff when you take it back. During night and weekends our electricity is cheeper then during piek hours (day hours).



Gangster politicians and corporations , giving lip-service to green energy but all the time sabotaging the transformation with taxes on panels from China etc ..

I guess your plan is to be  completely independent , cut off from the grid all together???

Remember panels need to be cleaned regularly ...

I would advise you check out making a spot welder ... very easy using 18650s as a power source , and a motorcycle starter relay to switch current ... 

IMO fusing each cell is  unnecessary 

Good Luck.
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#9
Cut off off the grid is not legal here. Every house needs to be attached. The goal is that i only use electricity during the night from the grid in winter. When solar panels arent producing enough to cover the usage.
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#10
Or just use the grid as backup. If they "require" you to use power, then hook up a light bulb and let it run 24/7. A 40W bulb would suffice. Or use a small fan.

Then just as you add to your system and expand energy production/capacity, you move circuits over to the new panel (that is, having 2 breaker panels; inverter feeds one unit, mains is the other). Then use a transfer switch if your capacity runs too low and you need to use grid as backup.
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Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
(this chat is not directly affiliated with SecondLifeStorage; VALID email req'd)

Kickstarter: Honest STM32F103 based dev Boards
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