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Very Basic Setup


Nutlang

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Hi Guys

Totally a newbie here, so excuse my ignorance and stupidy beforehand :)

I bought a 1500W Sun Magic inverter with internal charger connected to a 200a/h 12V Dsatk slim line Gel Battery..Suspect i will be paying "school fees" pretty soon on the battery.. Total cost around R5850.. I try and limit the DC voltage to not go below 12V as according to most this is when the battery is at 50% DOD ?; not sure..

My load connected to this is around 370W, consist of a 50" Samsung LED TV = 150W; soundbar @ 210W and then the router and fibre connection box... 

My question that I have is that on the inverter, when it cuts out, shows 14.2V, with my multi meter I get 12.8V on the battery... I suspect the multi meter would be more accurate ??

Thoughts ?

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On 2023/06/02 at 10:44 AM, Nutlang said:

Hi Guys

Totally a newbie here, so excuse my ignorance and stupidy beforehand :)

I bought a 1500W Sun Magic inverter with internal charger connected to a 200a/h 12V Dsatk slim line Gel Battery..Suspect i will be paying "school fees" pretty soon on the battery.. Total cost around R5850.. I try and limit the DC voltage to not go below 12V as according to most this is when the battery is at 50% DOD ?; not sure..

My load connected to this is around 370W, consist of a 50" Samsung LED TV = 150W; soundbar @ 210W and then the router and fibre connection box... 

My question that I have is that on the inverter, when it cuts out, shows 14.2V, with my multi meter I get 12.8V on the battery... I suspect the multi meter would be more accurate ??

Thoughts ?

A lot of these inverters are not accurate so I would trust the multimeter but to be 100% comper your multimeter with and friend one .

The 50% dod is resting volts and not load volts so depending on the average load you can set your cut of volts lower than the  50% resting volts .

An safe resting volts should be around 12.1,  if your resting volts is 12.8 then your soc is around 85% . 

 

Edited by GMAC
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Thx for the feedback and advice

Much appreciated..

On 2023/06/04 at 7:44 PM, GMAC said:

A lot of these inverters are not accurate so I would trust the multimeter but to be 100% comper your multimeter with and friend one .

The 50% dod is resting volts and not load volts so depending on the average load you can set your cut of volts lower than the  50% resting volts .

An safe resting volts should be around 12.1,  if your resting volts is 12.8 then your soc is around 85% . 

 

 

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