ericfx1984
Solar Enthusiast
- Joined
- Oct 10, 2021
- Messages
- 763
Recently set up a system for fellow... Cheap Chinese 3,000 w all in one 24 volt inverter, 1200 Watts of solar panels and a cheap Chinese 24 volt 100 amp power battery
Anyway he's been living for about a year or more with no electricity other than running a generator powered off of propane
For him this has been a game changer
However every now and again he will wake up and the batteries are drained down to about 24 volts...
Today I went ahead and charged his batteries by using his generator to power the AC charger
Brought it up full power until the battery stopped charging and then used a clamp meter on the battery and a 1500 watt heat gun
The heat gun worked out to about 1,450 watts coming off the battery and he ran for about an hour and a half before the battery went to the inverters shut off voltage which works out to about 10% battery remaining
Now this isn't a particularly accurate test... But based on the numbers the battery test at about 96% or... 2450 watt hours
I feel like for this type of test especially being pulled at a rather high rate of discharge... It's within the margin of error
In short the battery could be 90% or it could be 110% or anything in between
Anyway he lives in an RV and he would like to run his small portable air conditioner
I initially explained to him that the 24 volt, 100 amp hour lithium iron phosphate battery could probably do it but that it would really be on the absolute limit of its capabilities
I believe I have him convinced to add a second battery at this point
Does my testing methodology seem to make sense...
My calculations I would think that he should be able to run the portable air conditioner overnight for about 4 hours and still have a reasonable reserve in the morning
Luckily his portable air conditioner has a shut off timer
Thoughts? Comments? Critiques? Insults?
Anyway he's been living for about a year or more with no electricity other than running a generator powered off of propane
For him this has been a game changer
However every now and again he will wake up and the batteries are drained down to about 24 volts...
Today I went ahead and charged his batteries by using his generator to power the AC charger
Brought it up full power until the battery stopped charging and then used a clamp meter on the battery and a 1500 watt heat gun
The heat gun worked out to about 1,450 watts coming off the battery and he ran for about an hour and a half before the battery went to the inverters shut off voltage which works out to about 10% battery remaining
Now this isn't a particularly accurate test... But based on the numbers the battery test at about 96% or... 2450 watt hours
I feel like for this type of test especially being pulled at a rather high rate of discharge... It's within the margin of error
In short the battery could be 90% or it could be 110% or anything in between
Anyway he lives in an RV and he would like to run his small portable air conditioner
I initially explained to him that the 24 volt, 100 amp hour lithium iron phosphate battery could probably do it but that it would really be on the absolute limit of its capabilities
I believe I have him convinced to add a second battery at this point
Does my testing methodology seem to make sense...
My calculations I would think that he should be able to run the portable air conditioner overnight for about 4 hours and still have a reasonable reserve in the morning
Luckily his portable air conditioner has a shut off timer
Thoughts? Comments? Critiques? Insults?