2+ volts per heater in tank

[Tmcgoo13]

I’m seeing at least a 2 volt increase in the tank per heater. Have 2 heaters in the sump and one in tank (for emergency). The two in the sump are Aquatop 300W heaters where the controller is on a cord, no control in the water. Seems odd that all 3 heaters would be causing this, can there be some interaction between them and something else? Anyone seen this with this heater?

 

[road_runner]

I’m seeing at least a 2 volt increase in the tank per heater. Have 2 heaters in the sump and one in tank (for emergency). The two in the sump are Aquatop 300W heaters where the controller is on a cord, no control in the water. Seems odd that all 3 heaters would be causing this, can there be some interaction between them and something else? Anyone seen this with this heater?

Do you mean stray voltage or DC voltage?
How are you measuring it?

 

[Tmcgoo13]

Do you mean stray voltage or DC voltage?
How are you measuring it?

I’m measuring AC voltage via a voltmeter, measuring 8volts total in the tank

 

[road_runner]

I’m measuring AC voltage via a voltmeter, measuring 8volts total in the tank

How are you measuring exactly? Where is the 2 probs?

 

[Tmcgoo13]

How are you measuring exactly? Where is the 2 probs?[/QUOTE

Ground probe in ground of heavy duty outdoor extension cord plugged directly into outlet and red probe in tank. Meter set at ACV 200

 

[Tmcgoo13]

Ground probe in ground of heavy duty outdoor extension cord plugged directly into outlet and red probe in tank. Meter set at ACV 200