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Using my Geyserwatcher Ultra and 3 panels, you would have +60°C every day with a 150L geyser with out compromising the load on the inverter for other things such as dishwasher and cloths washing machines. You can download the brochure on www.geyserwatcher.com.
I dont pick up the difference between the Eco and Ultra on the spec sheet , besides price, size and weight , what am I missing ?
There are quite a few of these smart geyser monitors, Geyser wize, hot bot and I see the plumber just installed another brand on a site where we are working... another app to add to the collection.
I think the trick with all these new smart devices is to find ones that dont have a monthly subscription.
Talking about subscription, I am thinking it is time to start charging a monthly subscription to "manage sites".
I dont pick up the difference between the Eco and Ultra on the spec sheet , besides price, size and weight , what am I missing ?
The difference is that the Econo is a PWM controller, which means that it does do a MPPT track, but the voltage to the element is a function of the number of panels in series. If the voltage is below 180V, then the current to the element is lower. To get the full efficiency out of the PV panels you require a minimum of 5 panels to get sufficient voltage to drive the element at the kW available from the panel.
The Ultra is a true MPPT controller with a built in voltage multiplier in it, so any number of panels will take all the energy available in the panels and pass it on to the element.
In the Econo, lets say you have 3 550W panels and the voltage at MPPT is 126V, and lets say that it is a 3kW element, with a resistance of 13ohms, the maximum current from 126 V is 9.2A, that's 1172W, but your panels can deliver 1650W, so you are short of 478W, to improve the system you need to up the voltage.
Sane scenario with the Ultra, the output voltage is a function of the MPPT of the 3 panels, and using the same load will deliver 1650W into the element, in other words the voltage is multiplied to 146V at 11.25A.
The higher cost of the Ultra is for the multiplier circuit.
Victor - Knowledge is a blessing or a curse, your current circumstances make you decide! Solar pumping, Solar Geyser & Solar Security lighting solutions - www.microsolve.co.za
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