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Etienne avatar image
Etienne asked

New Phoenix inverter Bad Voltage readings

Hello, new Here,


I just installed my Small solar system (SmartSolar Mppt 75/15 with 200w solar pannel, i will recieve soon a second Controller and pannel). A 100ah AGM battery ans a Phoenix 12/500 (with v.direct) inverter .

The inverter is working but i get Strange battery Reading from the Phoenix:

(I get 12.25V by Reading with a voltmeter directly on the battery and 12.16v at the Phoenix input )

screenshot-20230130-190911.png

also tested without load pluged on 230V :

screenshot-20230130-184814.png


For the cable i use a 4mm2 cable lenght Between 30-50cm .

Something is wrong or it's normal working of the Phoenix ?


Thanks in advance.

Cordially. Etienne (Yes it's m'y Real surname ^^ )

Phoenix Inverter
screenshot-20230130-190911.png (119.5 KiB)
screenshot-20230130-184814.png (120.2 KiB)
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klim8skeptic avatar image
klim8skeptic answered ·

For the cable i use a 4mm2 cable lenght Between 30-50cm .

Voltage drop along thin cables?

You should use thicker cables between the battery and inverter. Dont forget to have a fuse close to the battery as well.

The manual. gives cable recommendations. 10mm cable and a 60a fuse would be appropriate.

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Etienne avatar image
Etienne answered ·

Thanks for your answer, i will use 6mm cable ( i dont use more than 10-20A from DC (Between 100-150w on AC) to Inverter, i will put a 40A circuit breaker). I adjust the low voltage according to measurment on the battery (Actually, just configure the cut Off Voltage at 11.4V or less . When it cut the battery Voltage up to 11.8-11.9v that remain Between 30-50% for Not damage battery).

I have also grounded the Inverter, it cut proprely when i test the line with the residual current breaker. I have also ordered circuit breaker and a little box for Make a proper installation. Actually it's more "on test".

A little question about Low Voltage alarm, can you confirme that is only "Visual" alarm, no sound and beep because i dont ear beeps when it flash Red.

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klim8skeptic avatar image klim8skeptic ♦ commented ·

can you confirme that is only "Visual" alarm, no sound and beep because i dont ear beeps when it flash Red.

Cant confirm, but assume no buzzer.

I adjust the low voltage according to measurment on the battery (Actually, just configure the cut Off Voltage at 11.4V or less . When it cut the battery Voltage up to 11.8-11.9v that remain Between 30-50% for Not damage battery).

Have a look at "Dynamic cut off". The low voltage cut off is more intelligent, depending on how much current (load) the inverter is handling.

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