Using an inverter and battery charger on the same battery at the same time

munchies

Well-Known Member
Joined
Mar 18, 2015
Messages
111
#1
Hi All

So heres my issue. I bought a goldstone inverter (http://www.bidorbuy.co.za/item/183003222/DC_to_AC_Inverter_660W_Free_Shipping.html) and didn't do my research very well. I thought it would charge the battery and then swap over to the battery when load shedding kicks in. Evidently it does not :crying: The inverter has no power cable to a wall plug!

So I bought a 12v Battery charger from builders to charge the battery. Now my question is, can I just have the charger constantly connected to the battery as well as the the inverter connected to the battery? In my mind I should then not see a drop should load shedding kick in. My only concern is that the inverter is constantly working. So would that be a problem?

Thanks
 

Sinbad

Honorary Master
Joined
Jun 5, 2006
Messages
64,724
#2
Hi All

So heres my issue. I bought a goldstone inverter (http://www.bidorbuy.co.za/item/183003222/DC_to_AC_Inverter_660W_Free_Shipping.html) and didn't do my research very well. I thought it would charge the battery and then swap over to the battery when load shedding kicks in. Evidently it does not :crying: The inverter has no power cable to a wall plug!

So I bought a 12v Battery charger from builders to charge the battery. Now my question is, can I just have the charger constantly connected to the battery as well as the the inverter connected to the battery? In my mind I should then not see a drop should load shedding kick in. My only concern is that the inverter is constantly working. So would that be a problem?

Thanks
Depends what the voltage tolerance of the inverter is. I tried something like this with a cheap inverter, once the battery was full the charger voltage hit 14V and the inverter shut down.
 

munchies

Well-Known Member
Joined
Mar 18, 2015
Messages
111
#3
Thanks. Well as you can see this probably isn't the highest quality inverter. The manual says the input voltage is between 10v-14v. I guess the real question is if it does work, can I keep it going indefinitely without causing any damage to the TV or inverter?
 

Fuzzbox

Senior Member
Joined
Jun 10, 2009
Messages
986
#4
Thats why you need a MPPT inverter.
These have charger and inverter functions all in one.
There is no really cheap route.
They will monitor the float voltage, ie battery voltage.
When the battery gets to about 13.8v the charger part will charge the battery less.
This is all controlled by MPPT like Victron.
 
Last edited:

Sinbad

Honorary Master
Joined
Jun 5, 2006
Messages
64,724
#5
Thats why you need a MPPT inverter.
These have charger and inverter functions all in one.
There is no really cheap route.
They will monitor the float voltage, ie battery voltage.
When the battery gets to about 13.8v the charger part will charge the battery less.
This is all controlled by MPPT like Victron.
no nononono

MPPT is maximum power point tracking. Specific to solar applications, getting the most efficiency out of your solar panels. It has nothing to do with charging batteries from a battery charger.
 
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