Here are a few stats from today's run of about 5 hours:
- Average pool temperature ran around 22°C - the impact of the cell was negligible.
- The internal temperature of the box itself was around 35°C while the unit was running.
- The outlet temperature was around 24°C showing that heat was, in fact, transferring to the water.
- When I turned it off for an hour or so and then started it up, the water temp was 60°C - which shows it can develop some pretty good heating!
I did have to buy a new pump since my old one was just too small. This one is a nice little 1/4 HP submersible pump that has the benefit of running very quietly. I'm not 100% sure it will be able to pump through three units, but I at least think it will be able to handle two.
This shows the general arrangement. The pump is in the pool and the cell is propped up pointing south. This is just temporary until I prove out the design, then it's up to the roof of the garage.
Another shot from the front:
When I get it a bit more proved in, I'll try running my Arduino monitoring system then have the monitoring system actually turn the pump on and off.The key thing I learned from the run today is that the cell needs to have the air purged out of it before it will run, so I need to hook it to the hose to flush the air and then quickly get the pump hooked up to it. In future, I may have to build an Arduino and solenoid valve based solution to handle the start-up purging automatically.