Originally Posted by Tinsu
Ko777. Is the only battery inside that I need to replace for smoke detector?
Yes, did you ever check your main battery charge level? Make sure to charge it to full all the time to prolong its life to the max. It should be over 12.6 volts to be considered 100% charged. To prevent over charging it, pull out the external battery fuse after it is fully charged.
The way I find out the built in charger did its job is by using a watt meter connected between the RV power cord and the outlet, when it reads below 20 watts, at this point everything that needs power is idle ie: fridge reached the desired temp and the battery is fully charged. Make sure all the internal devices are turned off; at this point I pull out the battery fuse.
This is how I set up my watt meter:
It is indicating that the fridge and other devices in the RV is currently using 184 watts. After 200 hours plugged in, it recorded 27.27 kwh total electric usage but this includes charging my ebikes everyday. The other device is a timer to prevent overcharging the ebikes batteries.