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There are a lot of different BMS available. So it should be a choose BMS after you get cells. But what are you going to use your battery for?

Yes, but you can build a thermoinsulated box for battery with thermostat controlled heating pad. It will consume very small power to keep battery above freezing temperature.

For 72 Volts you need a 20S BMS. And lots of them are available on aliexpress and amazon. For example https://www.amazon.com/DALY-Li-ion-Programmable-Bluetooth-Module/dp/B09798N5GR https://aliexpress.ru/item/33017576894.html?item_id=33017576894 Please note it's not a recommendation. Just an...

It depends. You just need to do a test.

In most cases it's OK to connect two different 12V batteries in series. But you should regularly check each battery voltage. They can easily get of balance. When it happens you need to disconnect them and charge separately. Just try to run such a setup for a few days and see how often you will...

According to EVO spec it requires an external soalr chrge controller if you wish to use it with solar panel. I'd use an all in one system like MPP LV2424 or something similar instead. Wire gauge between panel and solar charge controller depends on panel configuration. Mentioned LV2424 allows...

Got a Lossigy LiFePo 12V 200Ah battery from Amazon recently. I've charged it to the manufacturer's recommended 14.6V and ran a capacity test. I used a DL24 smart load and ran a Constant Current test at 12A. With such a low load, I've got around 206 Ah. So far, everything looks good. I will...

Substracting? What substracting? If you wish to use Demestres ammeters you can keep shunt connection as is but just put some addition al circuitry on low voltage part of it. Something based on Op-Amp or MCU to read voltage and rectify/convert it to be acceptable by ammeter head. You can even...

I'd just use ammeter like this https://www.westmarine.com/buy/blue-sea-systems--analog-dc-ammeter-100-to-100a-with-shunt--3827136

Actually maximum allowed amps depends on insulation temperature rating. For 12 AWG wire 20Amp limit is for 65C rated insulation. If you have a 90C rated wire insulation you can use 12AWG for up 30Amp https://www.cerrowire.com/products/resources/tables-calculators/ampacity-charts/ About power...

Looks like you need not a BMS but just a battery equalizer. Something like this one - https://www.amazon.com/PowMr-Battery-Equalizer-Voltage-Balancer/dp/B07L8XKZ71/

It's very hard to be killed by 120V AC if your skin is dry. I was many time zapped by 220V and couple times I was stupid enough to accidentally touch one 220V wire by one hand and another wire by another hand. Still alive :)

LiFePo batteries have much longer lifespan (3000-5000 charge/discharge cycles vs ~500), so it definitely has an economic sense.

Yes, if switch is fully open or fully close. But when you do switching - high voltage will cause an electric arch. Higher voltage - longer arc(in time and distance). An electric arch is generating high frequency RF emission and current pulsations. Inductors and capacitors inside of MPPT may...

Exploded cell will leak enough electrolytes to make distilled water conductive.

Looks OK. In general a 100Ah LiFePo battery is a OK replacement for 200Ah deep-cycle lead-acid.

They are completely OK for this below 3Amp current.

15Kwh will heat up and completely boil out around 21 liters of water.

It's not exactly true. You can use a YR1035 to test battery of any capacity. However it can measure internal resistance as low as 0.30--0.50 milliohms or higher. A high capacity cells may have a very low internal resistance, and it can be out of YR1035 range. Typical 100AHr LiFePo cell has...

Solar panel gives you maximum voltage at zero Amps and maximum current (Amps) at zero volts. In both cases you have a zero Watts. An MPPT charger is trying to squeeze maximum Watts by choosing the best Volts/Amps ratio.

IF slow charging (8 Amp) is OK for you I can recommend an ISDT nano Q6 https://www.amazon.com/dp/B07D5N27Z2. It support a lots of chemistries including LifePo4. But you need an external DC 16-30V power supply and couple of XT-60 female connectors to wire a power supply and battery...

So for both 2s2p and 2s3p you need a controller with at least 50V input voltage. For 2s3p you will have up to 30Amp. And controller should support 24 Volt batteries. There are lots of such controllers. For example: https://www.amazon.com/Renogy-Solar-Charge-Controller-Compatible/dp/B07DNVW37B...

Should be OK

Looks like 5.5mmx2.1mm connector . But could be some other size.

What exactly modem do you have?

What is 1920 mvh? Do you mean 1920 KWh?

Do you have a still washer between lug and battery? If so it could be a reason for heating. Non copper/aluminum washer should be placed only between lug and nut.

Yes PWM controllers have max input rate for voltage. They also have max amp rate they can provide for battery charging. So PWM controller like this one https://www.amazon.com/Controller-Battery-Intelligent-Regulator-Adjustable/dp/B072MMDY4F will limit your battery charging power consumption by...

Cool initiative! Are you going to share schematics of cell modules and control unit?

Most like some MOSFETs are fried. But you need to have tools and knowledge to find a real reason. You can try to sell this board on eBay.

Actual lead acid (including AGM) battery capacity depends on discharging rates. Higher discharge Amps get lower capacity. Usually battery Ah rated for 20Hr discharge. Check your battery datasheet for exact numbers. And please note that your 36Ah rate is for full discharge, not for 50%.

I'm using small gas generator similar to this one - https://www.tractorsupply.com/tsc/product/sportsman-1000w-inverter-portable-gasoline-generator-gen1000i-1694825 as an emergency back up for my RV. It's cheap but quite useful. I'm also using it for tent camping.

It's not a possibility. It's exactly how it works. Extra inverter dedicated for router is an overkill.

Yes, all routers use 5V, 3.3V and 1.8V for electronic inside. Input in 10-14V range should be completely OK.

There is no problem to connect AC consumer in series or in parallel. But connecting two or more AC sources is much more complex task.