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16 hours ago, Sid Genetry Solar said:Not with the current setup. There is no relay shutoff for the output (extra $$$).
All of the AC wave chopper circuitry had to have been handled in the speed controller--yeah, super easy that way...but a smidge more costly.
I would assume you are familiar with the function of a TRIAC? (If not, SCRs?) Basically, for an AC-wave chopper to function, you have to base all timing off of the AC zero crossing when the TRIAC turns off. Which is why the WiFi board would need an AC sync input in order to functionally drive an opto-TRIAC in AC-chopper mode.
Yeah, we have to get the GS fans custom-made to our specifications for a wider voltage range. Most of the off-the-shelf 12, 24, 48v fans have an extremely small voltage range--for example, many Delta 48v fans have an absolute maximum voltage of 53v. An off-grid 48v system can easily reach 60v+ with a temperature-compensated absorption charge on lead-acid batteries...bit of a problem.
I personally have a 16S LiFePo4 bank (peak charge voltage: 56.5v), with some stock 48v Deltas (FFB1248EHE) in my house inverter...and I've had one of them fail on me after several months of use. Smelled pretty bad, too...so far the other 2 are still working fine, fingers crossed...
Putting a fan with a certain voltage into an inverter is not an issue--unless the customer wants to void their warranty and change the system voltage down the road--everything in the inverter can handle a different voltage (12/24/36/48 for the 3k and 6k GS) after proper reconfiguration...but the fans may need replaced. We'll see, I may find (or be able to make) a super-efficient buck (or boost) converter that makes it real easy to use just a single fan voltage across the board in our inverters.
What is the minimum operating Voltage of the Delta 48 Volt fan and is it two or three wire?
Mean Well makes an ultra wide input buck converter. Between 19-72 volts. The SD-500L-12 will put out 480 watts continuously at 12 volts... They are about $150... But the design work is done. Maybe just reverse engineer that board and make your own. I wouldn't lose any sleep over that since the design was probably stolen from someone else anyway. There's a used SD-500L-24 on eBay right now for $36 to get started😂
Mean Well makes an ultra wide input buck converter. Between 19-72 volts. The SD-500L-12 will put out 480 watts continuously at 12 volts... They are about $150... But the design work is done. Maybe just reverse engineer that board and make your own. I wouldn't lose any sleep over that since the design was probably stolen from someone else anyway. There's a used SD-500L-24 on eBay right now for $36 to get started😂
Funny, the Mean Well case is nearly identical to the PowMr which is copied from the MakeSkyBlue units.😉
What is the minimum operating Voltage of the Delta 48 Volt fan and is it two or three wire?
The ones I have are 4-wire. I'm a bit of a cheapskate, I bought 'em off eBay, and learned that you really have to watch the "function code" following the part number on "surplus" fans. That function code is usually proprietary, and you have no idea what it'll do until you get it home. Got a batch that wouldn't go to 0RPM if you shorted the PWM wire to ground...they'd run at low speed. Not exactly what I had in mind...had to buy some different ones.
According to Digi-Key, the FFB1248EHE are rated 28 ~ 53VDC. Of course they won't run full speed down at 28v, but still...
Get rid of the fans altogether. Use a solenoid valve to turn on a water mister when the temp rises. Just spray the FETs and transformer down with some nice cool water🧐
😆🤯
1 hour ago, InPhase said:Get rid of the fans altogether. Use a solenoid valve to turn on a water mister when the temp rises. Just spray the FETs and transformer down with some nice cool water🧐
Better yet, just put the whole unit in mineral oil and pump it to a radiator. 😉
Better yet, just put the whole unit in mineral oil and pump it to a radiator. 😉
Maybe peanut oil. That's what Chick-fil-A fries their mosfets in.