I used a 1/8 steel control cabinet to store my cells. I don't think there is a tremendous risk of fire, but it doesn't hurt to over build if practical.
I use Milwaukee portaband to cut the conduit. I have a unfair advantage when it comes to building the cabinet for my system. These are pictures of some of the average jobs for me. Most people don't own hydraulic knockouts and have Panduit wire way laying around. They are not able to get their...
This is an old control cabinet I sourced from my work. 1/8 steel. Cement board behind the Inverters. I have 1/8 sheet wood inside to help with insulation when I have work on the batteries.
Starting second build for my buddy. My cabinet started out looking exactly like this one. Going to make a few very minor changes I learned from the first build.
Starting my PV side I needed a disconnect. I was not able to find anything with a metal case that could fit in the space I had available so I made one. This is 60 amp Eaton pull out box and two 32 amp / 4 Pole / IMO DC isolators.
I finally finish the Fast Pack . It looks a little better than when I started. I was able to take it out with my wife and daughter last night. We went 12 miles and only used 9% of the capacity of the battery.
I finally finish the Fast Pack . It looks a little better than when I started. I was able to take it out with my wife and daughter last night. We went 12 miles and only used 9% of the capacity of the battery.
As you can see in the first pictures the battery rack was completely ruined. I used it for dimensions and built a box to mount in the same position as the original. I added sides and a top to protect the controls and battery better than the open design from the factory.
Drilled and tapped my buss bars. Found you can take two bolts and nuts press 8 of them together and do them all at once. Hope this saves someone else some time.
I was able to take the moble battery pack out for a test drive yesterday. It will do a respectable top speed of 34 mph. Now I am waiting for my Anderson plug assembly to arrive so I can connect to my inverters and main cabinet.
Well the operation has been preformed. The patient had the offending object removed. We will have to do further testing to see if this procedure was a success.
This is what my cabinet started out like. This is one I used for the build I did for my buddy. https://diysolarforum.com/threads/mpp-lv6548-solar-build-30-kw-eve-304ah-lifepo4-battery-14-kw-pv-array.32343/ This is the complete build link.
Finally filling the top row with a new set of cells. $76 per cell for 314 EVE was to good to pass up. It was $600 dollars less expensive for a set of 16 than the first cells I ordered from China. Had to wait 3 days compared to 3 months the first go around. Very satisficed with my experience...
Success! I think I would rather pull 3 pieces of 2/0 wire through a1/2 conduit than put those communication cables back through that plastic wire cover.
Here is the test results. With the ground screws removed from both inverters running from the battery I created 17 amp current on the neutral. You can see in the photos there is now no current on the EGC. Hopes this helps anyone who wants to run there system as split phase 120/240.
I just started rebuilding my system. I have went back and forth but after running the system both ways I decided on a common neutral configuration. Here's the link to the complete build if you're interested in the whole thing...
I have decided to make a metal chase way for the whole assembly. This will be the most practical way to solve all the problems at once. It will be safe, serviceable, and look nice in the process if I execute it correctly.
Shot through a chronograph its doing around 770 fps. I have not found a place big enough to find one after we shot it for distance. I'm guessing over 750 yards.
I do industrial electrical work for a living. I am sad to say I bring enclosures like this to the recycling yard on a regular basis. You would do well to check out your local scrap yard. You might be surprised.
https://www.pv-magazine.com/2023/10/30/cause-of-30-kwh-battery-explosion-in-germany-remains-unclear/
Just reading about this event in Germany. I have this setup in my shop. Now I am wondering if I should think harder about venting or take this story with a grain of salt.
I have 230 ah cells with a 300 amp bms . It has a top speed of 35mph and has about 100 miles of range if you drive with efficiency in mind. My cart pulls 200+ amps at a full throttle standing start. When it is connected to my solar it is doing very light duty in comparison. Here's the video I...
The bms I am using gives you a field to adjust for each of your wires resistance. Thanks for the suggestion I believe you are correct for other BMS systems.
You can see on my build https://diysolarforum.com/threads/mpp-lv6548-solar-build-30-kw-eve-304ah-lifepo4-battery-14-kw-pv-array.32343/ that after I removed the bonding screw in one of my inverters the EGC no longer had any current on it. Hopes this helps.
I use the Smart BMS to keep track of the SOC. It also shows the amp output when I'm driving the cart. I have driven it over 40 miles on one trip and used less than 50% of the capacity the pack has. I believe based on my use so far that 100 miles would be possible on a full charge. Because off...
I purchased the inverters from watts24/7 and the batteries from Shenzhen Basen Technology Co., Ltd. . It just so happens that I received my second order today from them. It is a second set that I am going to install for my buddy. He liked my system so we order his batteries in November and just...
Distribution block for AC output. The next step makes me nervous. I have to update the firmware on all the inverters to make them able to work together.
This is the way I am wiring my system. It would never have the neutral and ECG bonded at more than one point at any given time. Since the two inverters communicating the way they are designed will both either be in bypass or inverting at the same time the system will only see one source.
Here's the only other picture I have to show how hard it shoots. Water cooler bottle before and after. I built it to look more dangerous than it was but it turned out to be more dangerous than it looks
Did you ever get your system installed? I am building a very similar system with what I think are the same panels. I'm about to get my permit and would like to get more information before the actually install to avoid problems. Here is the system I'm building if you are interested...
Both battery packs up running and balanced for a total of 604ah / 29.184 kWh. Just running my shop for now. I have to get my PV panels installed next. Top panel on one pallet didn't like its treatment during shipping.
The backer board on both projects are 1/2 cement board painted to match the cabinet. The enclosures are both Industrial control cabinets that I got from machines I rebuilt the controls on. I cut the legs off, turn them sideways and weld hinges on the door to let it open horizontally. check out...
I have two running together so my configuration would be a little different . But one thing you mention in your first post is the PV wattage input being 4000w . That is per mppt tracker. These units have two for a 8000w total. Hopes this helps you. I would also add that you will have a better...
I would have been doomed if it were not for youtube. The first two inverters did fine on the firmware update with the cable that came with the units.
The second older to units not so much. Fortunately a youtube video explains how to add a 3.3k resistor in order to make them work.
The next...
I have the same panels
I have the same panels. I have 32 in total I am going to divide them into 4 groups since I have two MPPT inputs on each of my inverters. Here is a picture one of the combiner box I have built to use them in 2-S 4-P configuration. I am using a MPP LV6548 that has a 250...
Thread 'DIY 230Ah EVE Mobile Battery (aka) EZGO Golf Cart' https://diysolarforum.com/threads/diy-230ah-eve-mobile-battery-aka-ezgo-golf-cart.40927/
This is what I built. I have it installed so it can run as part of my system.
It's a old control cabinet I got from a job. I rebiuld controls for machines. Here's some pictures of my biuld. https://diysolarforum.com/threads/4-mpp-lv6548-30-kw-eve-304ah-lifepo4-battery-14-kw-pv-array.32343/post-449279
Your equipment grounding can be connected all together as many times as necessary to insure a constant connection. The only time that you would have any restriction is were it is also bonded to the neutral. By NEC code it should only be at the Main service entrance. Every time after that it...
I am in the middle of a large build very similar to what you have imind.I have talked about alot of the things you are mentioning and got good answers. Here is the link hope you can get something that will help...
The two units work in concert with one anther the are either both in bypass or not the system sees them as one unit. I hope this does not come across as adversarial comments . It is hard to convey these conversations in text with no tone. I apricate that most commenters are trying to come to the...
Thanks. You are definitely correct on pointing out fire hazard concerns. The picture on my profile is from a panel where a mouse chewed a 16 awg wire running to a shunt trip in a 1200 amp 480v service. The arcing started a chain reaction that lead to the hole burnt through the panel enclosure...
I see a max of 225 amps from my 5kw motor @51v. That is on the highest acceleration setting. When driving under normal conditions I see 25 amps average. This is for 15 mph speed on level ground. It can pull 75 amps at 35 mph. Hope this helps.
I would also add that because of all the discussion that has taken place I am currently changing out my 2 pole transfer switch out to a 3 pole to eliminate the neutral connection on the load side of both sources that causes the objectionable current.
I would personally wire each battery to a buss bar with 2AWG wire allowing the units breaker to protect that part of the circuit. From the buss bar one larger conductor 2/0 AWG cable would run to the inverter protected by a class t fuse 300A. This will carry the combined current of the...
Started my golf cart build. Hoping to use a Anderson plug to connect my main bank to the cart for charging and drawing from the cart at night when not in use. I'm going to change out controller and motor for AC type. Building a 230Ah LiFePo4 battery pack and I'm going to try a JBD 300a bms.
I'm currently building a system you might want to look at Thread '230Ah Mobile Battery (aka) EZGO Golf Cart' https://diysolarforum.com/threads/230ah-mobile-battery-aka-ezgo-golf-cart.40927/
This is the way I am wiring my system. It would never have the neutral and ECG bonded at more than one point at any given time. Since the two inverters communicating the way they are designed will both either be in bypass or inverting at the same time the system will only see one source.
Between work and weather not much progress on the roof panel install. I got a few panels and put them on a temporary mount in front of my shop a few days ago they seem to do well. I am getting antsy to get the full array installed.
Thread '4 MPP LV6548 / 30 kW EVE 304ah LiFePO4 battery/ 14 kW PV array' https://diysolarforum.com/threads/4-mpp-lv6548-30-kw-eve-304ah-lifepo4-battery-14-kw-pv-array.32343/ This is a very similar system. Hope you can see something that will help.
I have just completed this. Maybe you can get some ideas from it. https://diysolarforum.com/threads/diy-230ah-eve-mobile-battery-aka-ezgo-golf-cart.40927/
Here in Mississippi they have a very similar billing arrangement. It is hard to blame them for only wanting to pay the rate they can purchase the power that wholesale from TVA. They have a massive investment in the grid and its maintenance. I built my system with batteries so I could get the...
This was an Item that came from a plant I do work for. I would only use three of the four poles on the transfer switch. It is a prebuilt unit. But the switch by itself runs around $1100...
Those numbers are based on the Vmp and Imp. The numbers you calculated are correct for the max. I had made this drawing thinking of figures it would operate at under most conditions. The higher figures would still be under the units rating for voltage. The amperage is limited to what they are...
Run each battery to a bus with 2 AWG it will be protected with the breaker on the unit. Then run the 2/0 AWG cable from the bus to the Inverter it will need its own protection. This will allow you to use the appropriate size lugs for your batteries terminals.
Thanks for your ideas I have limited experience with the pv side of things. I don't want to let the smoke out the Inverters so I am grateful for cautious advice for sure.