Hi all,
I'm looking for the best way to feed SSR (x2 crydom D1D40) for heating a 40gls water heater on charge stages.
I first used aux1 waste not but found it too slow, it was reverting to bulk as soon as absorb was reached, trying to supply full power (1200 watts total) to the elements x2 (1500W/120Vac). I tried different settings without real success and there wasn't enough sun to get the full power of the array (3.2kw/no other power source).
My first thought was that SSRs really need PWM signal to work more smoothly (Aux2 non available), so I decided to use the aux output from an old MX60 (2007) that I didn't use. I'm not sure if this early MX60 has real PWM output on diversion (FM60 aux is now PWM) but it seems to work far better than Aux1 wastenot. I'm using this remote MX60 with no solar input and I'm still looking for the best settings, aux diversion seems to work even when sleeping and compensated voltage match classic's voltage closely. My concern is MX60 Absorb time which can't match Classic end amps absorb time, I need to experiment it a little more today if sunny.
So, I'd have a few questions:
In 2007, was the MX60's aux diversion PWM or only On/Off output?
What would be the smoother settings for Classic's Aux1 wastenot to work on solar only?
Thanks for any help,
Erik
If you use the MX60 you might find this helpful. I don't think that vintage was PWM, but this would be a good place to ask:
Quotehttp://www.outbackpower.com/forum/viewtopic.php?f=29&t=2865
Quotetrying to supply full power (1200 watts total) to the elements x2 (1500W/120Vac)
I'm not sure I understand this? There are two elements. Each element is 1,500w. And, are they interlocked so max is 1,500w, or is max 3 kW?
We've been using the MX60 to preheat water for a few years now using 'diversion'. It works very well. ~ks
Hi Kit,
My mistake! This water heater is wired for 58.8Vabs, so I only have 2x 620W (20/21A 1240W total) with my 2x 3000W/120V elements (6000W total).
I've tried the MX in the afternoon yesterday, aux diversion was fast and ran the DC ssr very well, but I had to give up this morning because when the mx60 rised at 54/55V it began to divert just like when in float voltage. It should work very well if I could only add 3x panels to it to make real absorb and float charges.
So, for today I've used classic waste not (Aux1) trying to tweak it to keep the Classic on absorb. It was not so bad when sunny, but I'm still thinking that the MX aux was faster/smoother when the array is not at full power.
Anyway, I'm looking now how I could control an old tristar to PWM these two ssr/elements from classic aux1. Not really a problem, but I'm pretty sure that the tristar will not divert on float stage, looked at MSview but I couldn't find this info anywhere. I'm afraid that these Tristar pwm controllers were only made to control turbines on absorb voltage.
Erik