3:04 12V Battery Build 8:10 Bluetooth Connection 10:39 Charging/ Low Temp Protection Test 11:52 Max Current Test 12:35 24V Battery Build 15:29 24V BMS Low Temp Charting Protection Test 16:16 24V BMS Continuous Current Test 17:25 Max Load Till OCP is Triggered 17:56 Conclusion This video was meant to be a review of the BMS, but I just realized that I built 2 full function batteries! I will show this video to beginners from now on. I hope this video helps you guys :D

@irish3486

3 жыл бұрын

It's perfect, i keep going back and forth between 12 and 24 volt but i think this sold me on a 8 cell 24 volt.

@WillProwse

3 жыл бұрын

@@__WJK__ over an hour. The the pack was full

@__WJK__

3 жыл бұрын

Forgive me if I missed it... how many minutes did the 12v configuration power the 126a/1610w load(?)

@casstippit766

3 жыл бұрын

So with one of these, is there a point to running a shunt? Or is this accurate enough to replace needing a victron smart shunt?

@a.w.thompson4001

3 жыл бұрын

Thanks so much both for the bms review and the updated 24v (and 12v) battery build. Fantastic!

Love the way you demonstrate each step. You’re an awesome teacher Will.

Time for me to finally express some appreciation for your videos: really helpful. Building up my confidence to build a battery for our upcoming solar installation. Thank you so much for churning out these videos!

@WillProwse

3 жыл бұрын

Thanks 😁👍it can be scary at first, but it is super simple and fun after your first build. I'm glad I can help

Thank you for showing off quality materials and for demonstrating how to configure them. If I decide to go a DIY route, this gear will be the first on my list.

Your videos keep getting better! Great job!

This is an awesome video Will. Definitely building my confidence to build one myself. I appreciate your honesty in you videos and your willingness to demystify this for the rest of us! Thank you!

Just bought my Overkill BMS last night based on your previous recommendations. Then, I see this video today. So glad I went with quality equipment👍. Waiting for Overkill to come out with a 200-250A BMS 😉

I knew basically nothing about solar, making battery banks, or their related equipment before watching your videos. You are an excellent instructor and the way you take the time and effort to include every step in the process is incredibly helpful.

This looks really cool and very reliable products ! A nice overview, well done !

Yes! I’ve been waiting for this video!! I’m building a 48v battery bank with LiFePO4 cells for our electric sailboat and I’m looking at using this BMS 👍

I would love to see an in depth explanation video on how to use the Xiaoxiang BMS software and setup procedure to get best lifespan from lifepo4 battery.

@cdoublejj

2 жыл бұрын

I thought that was different for each battery/pack?

@oculophilia8724

Жыл бұрын

@@cdoublejj parameters are set on the cell level and then extrapolated for the whole pack.

Thanks Will! Yet another very helpful video and review.

Brutal. Super good video. Very nice BMS, I want one. The lid of these batteries gives a protective and attractive appearance.

I've bought several BMS' from Overkill over the last couple of years and never a problem. Good reference video, thanks!

Will, you do excellent videos. This tutorial exactly matches up with what I'm doing for my truck. Setting up a 560 ah Eve system to run off-grid air conditioner when I'm parked at Truck Stops. I've watched most of your videos. So informative. Thank you

Thank you for telling people about wearing safety glasses around the battery terminals. I normally always wear my safety goggles when doing any kind of work but it it's saved me the other day. I hooked up a inverter accidentally switching the polarity and the moment the terminal touch the stud all I could see was a blue flash of light and the only thing I could think was you talking about the story of solder hitting you in the eye.

I like this video. I bought your book in 2018 when I first discovered your channel. I just bought a cargo van and I am going to need a battery bank to run a induction stove and lights. You have been such a help in understanding the solar and battery world. Thanks

I love this guys videos!...I learn something every time I watch one...that pack he just put together would be great for a small electric car..

Thank you thank you! I’m now ready to pull the trigger and start my battery build :)

I was waiting for you to review an overkill! You said it was your favorite BMS but no review. Thanks for finally doing that review! Thumbs up and subscribed!

Will I want to thank you for doing such a good job of explaining these new battery systems for us old school gearheads. I feel much more comfortable now that I have a better understanding of them. We are looking at an off-grid property that will need a solar system. Only we will need two systems one for the home and one for the shop and barn.

Will you've taught me a lot on building as a Kenyan i appreciate your teaching skills .im really looking forward to building my first battery Thankyou

i will absolutely be picking up one of these. thanks so much!

Thanks for testing these BMSes! 😁 I'm definitely sold now. I like how many configurable settings there are.

Another GREAT video! You Are without a doubt my go to source for solar!

Perfect timing mate. I'm just about to update my 2x BMS out of my bank this looks perfect for my bank Thanks

Hey Will! I know this vid is 3 years old, but Id just like to thank you for all the great info on solar systems in general. This vid lead me to the Overkill BMS . I really didnt want to spend a fortune on Batrium or other BMS's that are like $1000! For all the features and performance, you really cant beat it. Im wiring up a 16s Eve 280AH pack to play with the BMS. If all goes well ill be getting another for my custom built 10Kwh cartridge style 18650 power wall. Ive been running it for 6 years with no BMS, just balancing it twice a year or so, but with the affordability and reliability of this BMS, im sure ill be getting a second one. The good thing about this vid being 3 years old is that Overkill is still in business so they can be trusted. Once again, Thanks!

Excellent video Will!

Thanks Will, I got one of these on the way, I cant wait!

This is a fantastic video. The BMS looks like it made the grade. !:- )

Most timely review ever!

life saver this was the exact configuration i was about to do even bought the frotune cells

damn, thats a nice setup! thanks for the video.

I bought this one two weeks before you posted this video. I'm glad you approve my choice

I love at the start you mention it's a product you actually like with great surprise... Because there is some much trash out there 🤣 great video!

@WillProwse

3 жыл бұрын

Hahahaha

@WillProwse

3 жыл бұрын

Exactly

@ianmburke

3 жыл бұрын

I wish more companies would focus on quality

Thank you from boomer notech artist i will not be making my own batpak yet but bcuz of your thorough study and teardowns thus recommendations ,I have learned enough to start with 2 100 watt panels and will choose a battgenerator for my bugout/camping /mobil massage/art studio trailer ... I am confident that you only promote the best ! I’m glad that you are getting compensation for your extensive work you have come so far ... I would love for you to write a book ( in your spare time ) about what you went through inspite of your difficulties ...what a no excuses life journey you stepped up and preavailed an inspiration to all young folks who feel lost and don’t think they have anything to contribute to the world bravo

As always great explanations.

Awesome video, things are explained very well.

I like that the Bluetooth module is included!

I’ve been running the 12v version for six months now and am extremely happy. Very easy to install and setup. Having the BT with app on my iphone makes it so simple to monitor. Had only one problem - the bulb on the temp sensor broke and he was VERY quick to send me a replacement. All in all a great product and great service. Heartily recommend.

@a787fxr

3 жыл бұрын

Do you know if it also works with Android?

@scothunter3221

3 жыл бұрын

Got the link to the app from Overkill’s website. I haven’t checked but I’s be extremely surprised if there was not one for android.

@a787fxr

3 жыл бұрын

@@scothunter3221 I just looked at the Overkill page from Wills link. It says programmable with Android. Thanks. !:- )

@learningtogether1902

Жыл бұрын

I have a 48v byd lithium batteries but unfortunately i misplaceed a card in the Battery pack that commicates with the bms is it posible to use any other bms or is there a way to use the batteries without any issues??

Very clear instructions. :)

Just built my first battery pack and after much deliberation between all of the BMS models out there, settled on the Overkill 4S 120A unit. What a great decision. Works perfectly, I can concur on the Bluetooth range, and just easy peasy to get everything up and running. The app just works. Can't be happier. They even will pre-install B- and C- leads to the BMS depending on your needs. And keeping true to the "Overkill" name, you can easily reduce the parameters as needed. So building a smaller pack is just as easy and you'll have a BMS that will allow you to increase the capacity of the pack later when you gain experience with handling this much energy.

Wow that is a really clean set up I’d love to put that in my house boat

I have the 4S 12V 120 model and have been very happy with it.

Great review and I'll be heading over to Over Kill Solar

Great job as per usual

I have a 12v and 24v Overkill Solar BMS that are about a year old now. One is on my trailer and the other is at my house. I love both of them, they work really well and are very reliable.

An interesting and appreciated effort, thank you

"Its so boring when everything works" LOL too funny! Great instructional video too.

Do a video on this BMS in parallel next!

brilliant beautiful wonderful… Thank you from a resident of a former first world country above mexico below canada

I got nearly the same two today from Overkill!

Will!!...this is the kind of stuff I like!!!..awesome video!!!..thanks man!!😁😊😊😎

This is the exact system I bought. 24 v along with an MPPT controller. I'm having reservations turning it on. Don't know how to program MPPT control box. Don't have a DVD player to play disk. Will, you're the best.

Your awsome man. Good videos.

Love your channel Will. I’m wanting to build a similar battery, but flattened out, not stacked together. Essentially a slimline battery pack. Keen to see you build one like that for low profile applications, like under a sub floor of a camper canopy

Great review!

I moved to these from Daly Smart BMS. Its so nice that it just works. One bug i noticed is that if you dont properly enter the parameters in the BT app, the BT can behave in a strange way.

I really appreciate the video.

I have this BMS for 8S! Overkill Solar was super cool to work with and he shipped and delivered within the week using USPS Priority. Upgraded to the 8ga 24” wire too - which is probably... overkill. It surged 4100w (170A) for my dryer as well. Even my 2000w gas generator failed at starting that motor. I’m glad I chose this BMS after watching your past videos. As much as I wanted a Chergery BMS it was just too much trouble when you factor in relays, etc. I trust the mosfets for my application and it’s barely more $ than a Daly BMS that doesn’t have all these cool features or reliability/quality control. Thanks Will!

@rosskstar

2 жыл бұрын

They're way cheaper than REC BMS - does that mean REC is severely overpriced with all the add-ons one must buy? i wonder...

@LarryL619

2 жыл бұрын

@@rosskstar good timing on this post. I just happened to order another 8S BMS for a 304ah battery build. The site says the BMS is backordered but I ordered on a Saturday and it came to my door on a Wednesday! I’ve always wondered what other BMSs are out there but I’ve had such good luck with Overkill.

I am a total beginner and used the overkill solar 8s 1p to create a 24v system...great product very happy planning to create 2 more

Love u buddy!

Awesome stuff Will 👍 I plan to build 4 of the 100ah/24v configuration soon. I've been building off grid systems for 11 years now, and this will be the first ever lithium based system! 😎 I was ready to make the switch a year ago, (based on your info then) and I came back to see what your current favorites were. Thanks.

I love this guy's videos.

I'm glad I found your channel, I've done solar systems with with lead acid and old school tech. Now that we are looking at off grid property I see no reason not to setup using these newer battery system. Because my background is marine I plan to set-up the home with 12 or 24 volt for lighting and 48 volt for the inverter for AC power. When it comes to the shop it is going to be a different story because of the high amp draw of some the tools and welder.

Great video Will Like the fact your using Safety glasses/ goggles In the trade we call them Spoggles They are used usually on windy days on a jobsite

Heck yeah! I'm geeking out! 🤓

Hi I like to say your the smartest person I ever seen on these systems, hope you know the average person can’t do this ,they have no training are knowledge to do this safe, I do love listening to you a man that knows it all , AAAAPlus Sir

I was successful at connecting up my 300 amp ANT BMS with monitor without smoking the board and charged my 48 volt Leaf Powerwall using my PowMr Charge controller. I let the BMS stop the charge and it worked perfectly. I was able to figure out how to connect the leaf modules to the BMS and feel very confident moving forward. Next is to test the inverter with the setup before going to a huge battery bank for our off grid AC coupled setup. I have two sets of solar panels. One on the house which is 7.2 kW and one that will be ground mounted and 6kW. My home system does not seem to be putting out as much as when we first put it up. Im getting at best right now about 36 to 38kWh during the day if it is clear all day. I used to get 42kWh during the summer. Our system has been up and running since 2005. Im happy with the design of my power wall. A 6.6kWh pack if the cells are at 58 ah. I Have not done a capacity check yet. All cells are within .030 of each other. I did bottom balance all my cells/modules. I let the go until they were stable. Max charge to 8.1 volts.

I have the 12V model now for about 2 months. Running IOS to control. I cant say enough about how easy this is to configure and use. NO problem at all connecting to IOS and it just works. Got it from WAMAZON for $115 and it has the absolute best ENGLISH manual. Steve makes sense when he says the first thing you do is parallel every cell and in a few days hook up the BMS. I wish the alarm would hit the IOS notification screen and it balances at something around 1 amp only so you have a challenge if you use B cells. I hang a few extra active cell balancers on my pack that I saw Will demo to make sure my solar system wont overpower just to be extra safe. It stops in and out as advertised when you go over or under what you set it to. And Steve if your watching this I am running a 4S 11P 100AH cell pack Grade B. Yes its giant for this little guy but I only push 400 watts in and run one large freezer out so I decided to not pay a zillion dollars for more sophistication.

Perfect timing! I was just looking at buying a 24v BMS for my 280ah system

@greersimpson

3 жыл бұрын

Also Canadian in BC just ordered 24v BMS for my 280Ah system!

In the Last Vid I watched you said not to connect the inverter last as its dangerous, in this vid you did exactly that XD Just an observation, keep up the great vids !

Great channel, I watch almost everything you put out. I tried to order some of these Fortune cells from overkill solar but unless I order 64+ I can’t because I live in the UK, some rule. Keep up the good work.

I use the 12v version, worth every penny. Love this bms

I bought an 8S Overkill BMS back around July of 2020 and the app now looks better. Back when I downloaded it - it is a bit clunky and some nuisance bugs, but it looks like they have done some updates. Time to update my app, I guess. The BMS itself has worked flawlessly for me.

Still back ordered and taking a month to fulfill orders. I ordered mine right after this video landed. I finally received word that due to Will reviewing this BMS, their sales quadrupled, and the BMS are finally in. They just need to be soldered then they can ship. Hoping next week!! I just got my cells from China, and cant wait to hook everything up!!

Nice very easy! Already have my batteries set up but your video make me do again 😄😩

Can't wait to get mine and get going on building my own with EVE 280 AH batteries. I just ordered it a few days ago along with your book Will. My cabin loses power often and this will come in handy. Batteries won't be here for another few weeks so I need patience.

@Orangie2008

3 жыл бұрын

Where did you find these with such a short turnaround time?

@balanwyt

3 жыл бұрын

@@Orangie2008 order the batteries 6 weeks ago from ali express knowing they would take time. I just ordered the bms a few days ago.

When you test a BMS it would be informative to measure the BMS input to output voltage drops as well as IR gun temp reading of case along with the discharge current used.

Hi Will, enjoying all your videos. Extremely educational and helpful. I am not surprised to see the view count. Most people are talking about the challenges around connecting a DIY BMS to an AC inverter using RS485 e.g. GroWatt AC3000. I don't see any useful info when I google. See if you can do a video please. Thanks.

I think I'd add numbering labels to the balance leads whilst making the cable. It saves errors and makes harness setup/maintenance really easy

Darn! I wish you had made this a couple weeks earlier! I just bought an 8S and installed it on an old Enphase AC battery that had a dead comms board. I would have loved to use your links.

I just ordered this for my Ampere Time 200ah battery so that I can have low temp protection as well as more control. Taking the battery apart was a PITA but I think it will be worth it!

Great video

I've bought a couple of these now and both of them are very solid. I believe the Overkill BMS is actually manufactured by Xioxang. Very easy to program using the USB link and a laptop.

Thanks will. I’m thinking I want to build a battleborn battery inverter bank to use in power outages. Your opinions impress me young man.

Loved this...

So far so good for high quality. One wire missing on the connector, found another to replace the missing, connected BMS, one wire burned. Took apart BMS, a tin bridge shorting several contacts together, BMS sent cells into short - no surprise I saw the smoke. Test slip seems to be generated without connecting the actual BMS ... Communication with the seller ... well, it all sounded like I do not know what I was doing, huh.

Thanks great video

Sorry, my last comment was absolutely wrong... newbie math. Parallel adds amps and volts remain same So my example cells are 3.2v 280ah In parallel is 3.2v560ah Four of these in series is 12.8 volts 560ah. Thanks Will, I've learned so much from you. Your a really good teacher.

Thanks for another good test och video. Plan to buy two OverKilll 120A too a 440 (or 660) Ah pack, 2000W inverter.

Just picked up the 12v 4s, well worth money

Thanks Will.

At 7:20 you point to the main positive, but some people may not have noticed that you turned the battery around from the previous wiring up stage. Should be obvious since the main negative is now at the other end and covered, but sometimes it’s better to point out the obvious rather than let the “magic smoke” appear.

Lots of good info. Love your instruction videos... or was it a product review video? Knocked it out of the park again!

I love the return policy

Will, I have built 2 - 4S batteries using Docan 280 AH cells and 2 12V Overkill BMS. The BMS is active but when I connect the C- from the BMS to the chassis of the RV the BMS cuts off the current. I really appreciate your videos and have helped this rook immensely!.

Thank you Will! I just built my Two 12v 320ah batteries, into Milwaukee Packout boxes, using OVERKILL solar BMSs.. I'm VERY happy with them both so far. Still testing Capacity, as I run my 12v Car freezer off them. However I'm very pleased with the batteries overall. My only complaint is that Overkill's app REQUIRES GPS location data be enabled, and seems to clog up my Android phone. Sometimes locking it up all together. However the reliability rating is worth the risk, considering I use a quality VPN (which might be the cause of the lockup). 🤣 I wish I could show you pictures, but... 🤨

Just got mine and the new app with the xiaoxang is pure sickness. Huge upgrade over the older models(last year if you call that old) using this on android and no baloney getting the phone to take a .apk file like old models. Also glad the speed thing is gone i think these were made for ebikes previously. also if you are familiar with these alot of features that were locked with Chinese writing are now unlocked to English. I would rather have this setup then any off the shelf drop in lithium. The cold weather protection is PRICELESS and should be standard on all lithium batteries. The features on this new bluetooth BMS are unreal THANKS OVERKILL AND WILL another homerun product!

I figure if I keep listening to you I will someday understand electricity.

@FelixgreenYT

3 жыл бұрын

You will! It's pretty simple.. eventually. This man taught me and I've built my own system :) I also have a roomate who is smart on this stuff to fill in the gaps on things.