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I am not sure why he would need an Arduino. That seems very complex (depending on skill set) for a simple task. Just hook up the BMS as normal. Connect the Inverter directly to the battery (bypass the bms) and if wanted, connect the charge controller directly to the battery as well. Connect...

You do not need to use a BMS for all of your charge and discharge. After much research and testing, I think it's actually a bad idea to run large loads through a BMS. Way too many people have burned up their $200+ BMS units. If you top balance your cells and they are good cells, you can use a...

They can be recharged by an AC tech

dup post

It's not complete yet, but I have it setup in my off-grid garage running my deep freeze until its time to move it into the RV.

If anyone is interested in a design. I would be happy to make them one for a small fee.

Through the BMS

There is charge protection only from the higher volt charger. The lower voltage charger should cut off before any runaway happens, I have a separate relay I might use.

I made a better diagram. I am bypassing the bms for bulk charging and for the Inverter. One of the chargers will shut down at a lower voltage to prevent it from over charging the battery. I have top balanced the LifePo4 and it is staying balanced.

This guy has a bunch of videos explaining how to protect from EMP, including solar setups. https://youtube.com/user/disasterprepper

Why do people put fuses and circuit breakers between the battery and the solar charge controller? If the fuse or breaker pop, wont it burn out the charge controller as well? I can see why a manual shutoff is helpful but not the other two.

Yes, I understood your explanation from before. You explained it well. The new question is can I connect two shunts to the same shunt monitor?

Can I connect two shunts one from the P- from the BMS to the 12v buck converter and another from battery- to the bus bar and connect the battery monitor to both shunts to get a total in and out amp rating?

Thank you. That is what I was wondering. The 12v converter will need to connect to the bus bar with an SSR in between.

See attached photo

SSR are only used to turn devices off and on, like the inverter. They are not in the path of the main circuit.

What is a BMS? It is a cell balancer with some voltage monitors that can stop the flow of electrons. If you have a large system, I think it is more cost effective, safer and more efficient to Not have a BMS. Pushing (large) loads through FET's so one can balance and switch is not ideal. It...

I have a 60a 150v charge controller and a 24v Lifepo4 battery. I heard it is best to stay under the max. But is it even better to design the system to be as close as possible to the 24v as a designed minimum. Will this be easier on the charge controller? Or are the controllers more efficient at...

That was very helpful and exactly the information I was seeking! Thank you!

It's a new BMS with Bluetooth. How does one bodge with ssr, what is ssr?

Here is the link to the inverter. https://reliableinverters.com/products/3500w-power-inverter-pure-sine-wave-inverter I do not yet have a charge source. My plan is to add 800w of solar to the RV. Suggestions for a good, low cost MPP

I am putting together a new system for my RV. I have 8 lenshin 272a batteries, daley 60a 8s 24v BMS, 3500w (7k peak) 24v inverter, 24to12v stepdown converter, Parallax 3200 12v automatic converter . The inverter shutoff is 18.5 volts which is too low for the batteries. I want to be able to...

Thank you for the reply. Would it be posable to use a 24vdc to 48vdc converter?

I picked up a free and working APC MX3000 a few years back. It is in working condition and configured for 208v. Would I be able to plug in 8 Lishen 272ah lifepo4 batteries in place of the lead acid batteries? Would I need any additional equipment? The battery input for the APC is 48v I have...