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amazing video by the way!

Hi Dave - I have seen many projects where the racking is drilled into the sheathing irrespective of whether there is a rafter or a purlin. is this wrong?

Great, but they take up 2-3x space during delivery.

Thanks for this review! It is really cool to see this DIY battery kit. I have been considering EG4 for the Inverter with this kit. But, I don't know if this battery kit has the protocol to match? I definitely don't like the fact that the bracket can easily come close to contacting the Positive @ 14:00. The lack of "stock" isn't a real confidence booster either.

my man! you have done a potentially dangerous thing! an inverter should be switched off completely from the grid and from the load, give it a minute or two. Then you connect a battery to an inverter and let inverter run off the battery for a minute or two. Then connect to the grid. Then connect to the loads. Be safe!

What an AWESOME CHANNEL! Thank you Dave for doing this. I am looking to jump into solar at my property. Im rural like you. I want to do a 2 axis tracking system, do you have any input? Im in Wisconsin so this video was very helpful on Bifacial output and snow clearing value. Thank you

What if you tilt the vertical panel in between the starting of the morning peak and and end of the evening peak?

Will this version run a Refrigerator, and for how long?

If it had a JK BMS w/ active balancer and a breaker, I'd buy one! Nice clean look for DIY!

Does your battery system protect against backfeeding into the grid under grid power failure. ( Assuming the solar already has protection built in )

how is it in terms of safetey? the project is cool, but the idea of a 25kwh battery just chillin in my home is scary

As you verified the voltage between cells is very close however this does not mean they are all at the same charge state. From experience the cells will not be at the same state of charge unless you top balance them. I tried several days of hooking them up in parallel with no progress. One cell would always drain first and another cell would cut off at the top. I could watch it on the overkill BMS. After top balancing this took over a week with a 10 amp charger on a 12v bank, they preform much better but I do think the cell that would hit low voltage is not as “good” I now run an active balancer with this bank to help keep them balanced.

Now, time to go make the money to get the batteries with. 🚶 🚶 🚶

3 years ago!! Recent purchase of panels was $97 for 500 watt bifacial solar panels. So I only need 20 panels for 20KW However the shipping was going to cost as much as buying 4 extra panels at which point shipping was free. Panels prices sre dropping like a rock!! I’m mounting them on the roof ( lack of space in my yard) And mounting them vertically that gains me as much as 30% over rated yield. I’ll mount 2 of the extra panels for increased output on cloudy days. (2 will go in the attic to replace any damaged in the future). My racking costs amounted to $23 per panel. Wiring costs will be lower, since I not need 50 feet. But wire has gone up significantly. I have yet to decide is I want a back up battery or not. The Tesla version 3 includes a built in inverter but it’s $8400. For now I’ll leave it off. If the Electric company goes further away from net metering it will quickly pay for itself. I am looking at a bi-directional EV CHARGER TO USE THE BATTERY in my Tesla to act in that capacity. Then I can use the DC power directly and only use the inverter when I’m in surplus generational capacity. Typical power loss with inverters is around 5%!

I feel like you're few years late. Also that enclosure sucks, get one with adjustable compression (7 bolts, at least)

Cool

I bought factory built Chins batteries on amazon for $0.17/Wh. Personally my time is worth more than $.03/Wh

This is a cool idea but it hinges on cheap grade a batteries and the availability of that case. I was ready to purchase enough to build 5 of these batteries but they are all out of stock, the only batteries in stock in your links costs a whopping $800 for a set of 4 of the batteries, which comes to $3200 for just the cells, $100 less than the EG4 wall mount I am currently waiting for a free shipping promotion to purchase. Then you have the case, if you can get it, plus labor, and lack of a warranty. If they can keep these in stock then it will be an amazing value, but until then it isn't worth it imo. I love that this is happening though, I hope that a few other companies start doing this and provide cheap DIY battery kits.

At the cost of Chinese labour I don’t see how the DIY option can really save much money. If you are shipping the batteries and parts outside the case that will add extra shipping costs?

Just an FYI, when you "DIY" a battery shelf like @Off Grid Garage Australia (that you showed in your intro), you do it out of passion, not to save money..... So, the cost then is subjective..... And, Andy did build his shelf himself, thereby making it DIY. Nice build though. Just an FYI, You always leave off the center buss bar that joins the two halves of the pack together, this still makes it safe to work with while putting on the busbars and connecting up the BMS, once that is done you can then connect up the center busbar thereby completing the circuit... Also, for a quick visual inspection in the future, you can put a permanent maker line across the nut and stud heads to check for nut movement...

BMS must be 1C capably or 300A, not 200A... and this is first reason not to pay $500+ for metal box! I will Always go for full DIY or buy commercial one for little more $$$ In this option, we lost time, payd for metal box + batteries and saved absolutely NOTHING PS: and there is no breaker in DIY kit? Thanks but no thanks

does it come for a smaller battery set like for 5kwh

Can you test new AIKO FVE panels best on marker 25 procent effecient on 700WP , thanks.

$550 pretty steep for a box, terminals, and BMS. I'd probably need something like this with a configuration at 100V DC. It is time for the industry to move to this voltage.

If I was given one for nothing, then I would be rapped to build this DIY battery.....

Dave. You’re worth your weight in gold excellent knowledge and info. Please keep up the good work and info. Do you have a video on the grid tied inverter

How does the BMS work with EG4 Inverter chargers?

@Project With E. D. Truly great idea, David P. Made a similar video however i would use the CATL 204ah cells they only cost $38 each so a 10kWh battery would only cost $608 excluding the case, basically getting getting 2x the capacity at half the cost of an EG4 LL.

Lol. I buy factory built for $1,400. No need to build myself.

The cells that are in stock make this battery cost more than an EG4 with a 10 year warranty.

I'd be a bit concerned with standing the array upright. It puts 100lbs of load on the bottom cell. Fine laying down, which was what it was made for.

Doesn't help it's out of stock! Lol

Would it be possible to add something like this for an existing enphase battery setup? Would like to expand storage but enphase batteries are much higher costs.

Does anyone make a 100ah version of this?

Great video. Thanks! I'll need to locate my batteries and hybrid inverter in an unheated garage in PA. So I was wondering if there are any easy ways to add internal heating capability for the event that the garage temp falls below 32 degrees F, so I wouldn't have to put these cases in a temperature controlled enclosure. Any ideas? Thanks!

Is this a system that could be hooked up to an existing solar generator battery bank/pack, like an ecoflow Delta series, to be able to expand that capacity?

The new MB30/31 cells are $70 each which means 1120 for the cells. That is 3 times more power than buying a 5kw battery for same price.

Newly subscribed. Thank you. FL resident and I am dismayed that so many homes in FL do not have a solar. Sadly they require your solar be disconnected in grid down events. I am building a parallel network to avoid this restriction.

I guess if you want it fancy looking tfat is one diy way. How much was shipping. Cheers

Neat. Would love a kit that lets me drop the battery pack out of my Bolt at end of life and use that as home backup. EoL it'd probably still have 30kWh for essentially free. Just the cost of the kit and the labor. There are Leafs and Bolts for around $10 grand that have 20+ kWh battery packs in them. Why aren't we all using those?

@9:10 Why on earth would you touch both leads of a charged battery? Yes there was tape over the terminal and it’s only 52 volts but geez.

i hav a 24v batery. why does my inverter cutoff n alarm goes off at jus 21v? thats not even close to half capacity

This is for people who want to spend a lot of money and want to do a bunch of assembly so they can make a RUclips video. I hate videos like this.

Never use vinyl electrical tape for long term use, only use rubber electrical tape. Both are at the hardware stores. The glue used on vinyl tape degrades and turns to slim then the tape will slide apart and make a mess. I do use both both types but vinyl for only a month or less.

The dad we all wanted but never had