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The fan of my 3000w standalone inverter will not blow when 115w freezer is working but the moment one of the following : phone charger, tv or stand fan is turned on along with the working freezer, the inverter fan MUST run. Why pls?

My cable is not a regular cale for pv but it is working. I want to know if in need to upgrade it or not as the highest amp i v seen is about 20A. The cable is not hot. Will I get more amp if i change my cable to a bigger one since 12v system requires large size of cable? Note: MY CURRENT CABLE...

One of 4 of my batteries does not charge beyond 3.37v while d next to it is about 3.45v the last 2 are over charged to about 3.6 n 3.7 respectively. Overall charge on meter is 14.2v full charge. I make use of heltec bms. However, during usage/discharge,each battery reads same voltage for all 4...

Is it possible to get Bluetooth module function for LifePo4 battery only? I have a bms but need an external Bluetooth module that I can connect to it to enable me monitor my battery via my phone.

Do I really need a bms? If I can monitor my batteries manually? That is by ensuring I don't discharge below 12v and don't overcharge above 13.8v? Do a top voltage balance say once a month?