Poll: What inverter is best to use
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Singel hybride inverter
15.79%
3 15.79%
Multiple hybride inverters
31.58%
6 31.58%
Single inverter
15.79%
3 15.79%
Multiple inverters
36.84%
7 36.84%
Total 19 vote(s) 100%
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Aim high, 100 KWh powerwall
#11
It makes no sense to charge your ebike or e vehicles from your powerwall ..

If the solar feeds direct into the e vehicles you will have saved your powerwall work and it will last longer ...

Or just make sure you charge vehicles when the sun is out , then power is taken out of the powerwall into the vehicles at the same time power is going from panels into the powerwall ... so the powerwall voltage is fairly constant , the cells are neither charging or discharging and will last longer.

Bottom line , try to avoid charging e vehicles at night.

I notice that although 33 people have read this thread , only 3 have voted in the poll ...I suspect , like me , most are not sure what a hybrid inverter is , or why it should be necessary to use many ...etc

Anyone care to explain?
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#12
(12-01-2018, 04:12 AM)ozz93666 Wrote: I notice that although 33 people have read this thread , only 3 have voted in the poll ...I suspect , like me , most are not sure what a hybrid inverter is , or why it should be necessary to use many ...etc

Anyone care to explain?

Hybrid Inverters are discussed in fairly good detail in the FAQ, found on the main page in the top section.
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Proceed with caution. Knowledge is Power! Literally! Cool 
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#13
(12-01-2018, 04:12 AM)ozz93666 Wrote: It makes no sense to charge your ebike or e vehicles from your powerwall ..

If the solar feeds direct into the e vehicles you will have saved your powerwall work and it will last longer ...

Or just make sure you charge vehicles when the sun is out , then power is taken out of the powerwall into the vehicles at the same time power is going from panels into the powerwall ... so the powerwall voltage is fairly constant , the cells are neither charging or discharging and will last longer.

Bottom line , try to avoid charging e vehicles at night.

Completely agree here. Minimize your conversions as much as possible. Charge when charging doesn't cost anything, which is when the sun is out. When it's not possible, better to use a buck converter to go from the powerwall to the ebike pack. If they are nominally the same voltage, then you'd want to use a buck-boost converter that can top off the ebike even if the powerwall is lower.
Menno likes this post
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, ...)
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#14
Nice idea to charge the bikes with a Buck inverter. Will look into that.
Menno
Using 7S80P pack. Building 14S40P packs.
"Tell me, and will I forget. Show me, and I may remember. Involve me, and I will understand." Confucius 450 BC
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#15
48 KWh for daily use seems quite high. Upon reading the title I though you want to build a SHTF system.
2x power aim is fine although in my case I'd go for a 3x.
Anyway, it's quite an objective you've set there, hope you complete it successfully.
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#16
I have already Hot water solar heating, which in summer, when temp looks to top out,will be dumped into the pool to get a nice pool temperature. Currently I have 15KW build and another coming in the next coming months. Only when I am above the 30KW I will start connecting to the grid. I have currently only about 600W solar panel. Which preferable will be updated with a solar roof.
Menno
Using 7S80P pack. Building 14S40P packs.
"Tell me, and will I forget. Show me, and I may remember. Involve me, and I will understand." Confucius 450 BC
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#17
(12-01-2018, 01:21 AM)completelycharged Wrote: These are the types of inverter board I plan on using to build my own and oil bath cool the toroid

http://s.click.aliexpress.com/e/BrUq2Uo

I looked at these and wonder, would love to learn but don't have the experience or extra money yet.

I am in the 1600 kwh monthly range as well or 50 or so a day.  

If you do have a build log, would love to learn.  Also any of your building, you have did your homework. I have my basic work done but know for sure that I am not accounting for everything correctly.

CB
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#18
(11-30-2018, 03:38 AM)Menno Wrote: This project started end 2017 and only a few things where know.

1. Build with 18650 cells which I salvage from broken packs.
2. Aim for 2 times my highest measured daily use, which is 48 KWh. This means a target pack of 100KWh, as the future also will have an Electric car and Motorbike planned.

In the past years some basics are came up.
3. Max load for my house is estimated between 10 and 15 Kw.
4. I do not want to ballast the batteries more than 0.5C. This means I need at least 30 KWh before I start connecting to the net.
5. Battery packs will be 14S80P which makes an average of 5 KWh per pack. They are with electronics about 30 Kg and that is easier to handle and replace. Pack size is 560mm*400mm*<70mm. The ideas is to place them on the long side.

The first 5 Kw is packed, other are underway, See picture. The pack on the back is a 7S160P. This was my practice pack and I used cells that are not deemed right (low capacity or less than 90% of original capacity) for my Powerwall and is used for charging my E-Bikes. Currently I have >14 KWh packed. This is without a couple of smaller packs and the 7S160P Which I builded to test idea's. I have a steady stream of batteries coming in and currently have tested or are in testing another about 6 KWh on cells and more to come early next years. The expectation s that I will start hooking up somewhere end 2019.

I am not sure with what kind of BMS I will start working and what kind and size invertor I am going to use. I was thinking a Hybrid inverter, any advice is welcome.

>2. Aim for 2 times my highest measured daily use, which is 48 KWh. 
My 24 panel 6.885Kwh array produces 44kwh / day this month of June 2019.

>3. Max load for my house is estimated between 10 and 15 Kw.
Prior to my solar system the power comapny reports my daily hi (with 6 Ton air / 100F day and spa and regular stuff) at around 9kwh. I run several computer servers 24/7 that account for about 1500watts/hour.
 

>4. I do not want to ballast the batteries more than 0.5C. This means I need at least 30 KWh before I start connecting to the net.
My 18650 battery bank is 40kwh / 780ah @ 48v.   Its 14s360p and drives a 12,000watt AIMS that delivers 240v @ 50a.   At full load to the AIMS thats 48v @ 250a DC.  250a / 360cells = 690ma per cell max.   The system typically draws between 200 and 350ma per cell thru the day.  
My worst cell is 3amp (and best is 10amp) so that's within the 0.5C you are shooting for.

The power delivery to the house is everything active / significant power except spa and air conditioner.   This is computers, TV, Refrigerators, Hybrid Hot Water Heater, lights all over house, Cook Top, Kitchen outlets/appliances, offices, shallow well pump, and power tools (table saws, drills etc).   

Overall, with 7Kwh PV array, 40Kwh battery, and 12.000watt inverter the house (during the day in June) consumes an average of 28kwh 'directly from Panels' and another 15 from the 40kwh battery after the sun goes down and battery has charged up during the day.     I have a fixed cut-off at 48v on battery bank and then automatic transfer switch takes over to supply grid.

This puts my DOD (15kwh consumption/40kwh battery) at an average of 38% to consume everything a 44Kwh Array will deliver each day on a cycle that starts around 10:00am (inverter on at 52v) and ends around 4:00am (inverter off at 48v). That an average consumption by the house of 2750watts/hour over 16hrs.

My numbers suggest you only need 40kwh battery (or less) for daily 48kwh consumption. You may have 10kwh peek for a hour or 2 but I suspect the average is much lower.
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#19
Sorry for the silly question.

If you have 600W of solar how are you charging the batteries?

If it’s from the grid what is the advantage of storing?
Is your grid very unreliable.

I voted multiple inverters, I’m installing a 5kW Victron Multiplus, they can be paralleled later when I have more battery storage if I want the ability to charge our EV at 7kW.
Our current usage is around 13.5kWh a day plus the car.
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#20
(07-03-2019, 09:36 PM)Jon Wrote: Sorry for the silly question.

If you have 600W of solar how are you charging the batteries?

If it’s from the grid what is the advantage of storing?
Is your grid very unreliable.

I voted multiple inverters, I’m installing a 5kW Victron Multiplus, they can be paralleled later when I have more battery storage if I want the ability to charge our EV at 7kW.
Our current usage is around 13.5kWh a day plus the car.

Hi John, 


There are no silly questions. 


The pack is under construction. I have currently 15 KWh. Next month I will add another 5 KWh an more is underway. I have a total of about 30 KWh build or under construction. I only use one brand, type per cassette. So when I have one full it will be added to the other. I do not have it jet connected to the grid, I will do that when I have more than 30KWh in completed cassettes. The 15 KWh is now used to test incoming batteries, charging E-bikes and other packs. The 600W keeps it even in winter nicely topped up. I need to start looking what kind of inverter I need. My max load is estimated on about 15 KW and an electric car is in the planning.
Menno
Using 7S80P pack. Building 14S40P packs.
"Tell me, and will I forget. Show me, and I may remember. Involve me, and I will understand." Confucius 450 BC
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