SWC high salt when solar turned on

[mas985]

Well, a very interesting development. I did a couple of experiments and got the following results.

Put the spa on solar starting at about 90 degress and a salt level of 3200. Ran the cell temp up to 105 degrees but the salt level did not change at all, still 3200. The controller must do some compensation for temperature.

Next, I turned the valves to spa spillover without solar and waited 10 minutes for the panels to really heat up. Turned them on and I saw the temperature, salt level and amps all rise together until the temp hit 108 and salt hit 3700 and the warning came on. I immediately reset the cell and there is a 15 sec delay before coming on again. When it came on, the temp was still 108 but the salt level was down at 3200. I watched as the temp lowered but the salt level did not change.

I repeated the above again but after 20 min and got a slightly different result. The temp did not rise as quickly but the salt level did. It hit 3700 ppm when the temp was only 92 degrees. This makes me think it is a salinity issue and not temperature.

If temperature is causing the problem, it may be that the controller cannot compensate fast enough for a fast rise in temperature or even display it correctly.