# question

## MPPT 150/100 Temperature Compensation With Smart Sense

I have a MPPT 150/100 charge controller with a Smart Sense temperature sensor attached to 4, six volt AGM batteries in a series/parallel configuration of 2+2 for a 12V bank.

Is my math correct?

The specs for temperature compensation on the batteries are -5mV per cell/°C.

I have 12 (4X3) cells so that's .005 times 12 = -.060 /°C for the entire bank. I have the controller set at -.060. Does this look correct?

batt.jpg (88.1 KiB)

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First of all, you have a 12V battery bank, so that's six cells in series. So 5mV * 6 = 30mV for the battery bank.

The next mistake you have made (based on your calculation of 5mV * 12 = 60mV), is that you have input 0.06mV (60μV) instead of 60mV.

So, you need to set 30mV for your setup.

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