Does DEKA make a good UPS battery?
I took a trip yesterday down near San Diego, it was twofold. One was to replace my free Trojan T-1275 that was a golf cart reject already when I got it with a pig of a 105# UPS 145ah AGM battery from ...
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A 120V AC fan certainly makes more sense. Why rob power from the output to power a fan when one can rob it from the input?
What I like about the modern computer fans is the efforts that go into impeller design, like the thickness flow/ foil of the fan blades themselves and their forward raked scythe like appearance. I make wood surfboard fins and flat spots either in the outline or in the thickness flow are extremely noticeable in use, sometimes causing humming and then it acts like a sea anchor was deployed. So to see these efforts in fan impeller design, floats my boat. I tend to scoff at angled flat blades with dull edges, even though they still do move air. Just like a foilless skeg tapered just at the edges still represents a measure of control, being drag in the tail.
But a modern foiled fin can help generate speed through turns, not just keep the assend from sliding sideways.
This is my Friend's powermax 100 amp adjustable voltage model.
Its provided 80mm fan has only one speed, fast and loud.
Surprisingly it also cycles on and off floating a pair of fully charged group 31 AGMS at 13.6v in warmer ambient temperatures, which causes the owner to just disconnect power, and then they self discharge at their ~2% per month rate.
We are going to add this spare 80MM fan on the output opposite the other fan,to be manually switched and run continuously whenever it is plugged into the grid. Removing the grille was step one:
I have more internal pics of this Powermax. I was surprised to see some smaller internal transistors with no heatsinking at all, but I guess they pass little current.
It appears the included single decimal place voltmeter is able to be calibrated, not that it needs it.
The Additional included Potentiometer for adjusting voltage is very sensitive with perhaps a 240 degree sweep from 12v to 15.5v, making it very difficult to really dial in voltage to the 0.01 of a volt.
Thinking about adding a 10 turn pot on a longer cable to reach dashboard of project vehicle. Powermax Unit will be close to batteries and likely not easily accessible.
The casing of the Powermax is not used as a heatsink, the internal finned heatsink runs the full length of the unit and I bet it would greatly benefit from a push/pull fan scenario, instead of just a pusher. Taking 0.25 amps to run the fan continuously is not an issue.
Increased dust accumulation however will be.
What I like about the modern computer fans is the efforts that go into impeller design, like the thickness flow/ foil of the fan blades themselves and their forward raked scythe like appearance. I make wood surfboard fins and flat spots either in the outline or in the thickness flow are extremely noticeable in use, sometimes causing humming and then it acts like a sea anchor was deployed. So to see these efforts in fan impeller design, floats my boat. I tend to scoff at angled flat blades with dull edges, even though they still do move air. Just like a foilless skeg tapered just at the edges still represents a measure of control, being drag in the tail.
But a modern foiled fin can help generate speed through turns, not just keep the assend from sliding sideways.
This is my Friend's powermax 100 amp adjustable voltage model.
Its provided 80mm fan has only one speed, fast and loud.
Surprisingly it also cycles on and off floating a pair of fully charged group 31 AGMS at 13.6v in warmer ambient temperatures, which causes the owner to just disconnect power, and then they self discharge at their ~2% per month rate.
We are going to add this spare 80MM fan on the output opposite the other fan,to be manually switched and run continuously whenever it is plugged into the grid. Removing the grille was step one:
I have more internal pics of this Powermax. I was surprised to see some smaller internal transistors with no heatsinking at all, but I guess they pass little current.
It appears the included single decimal place voltmeter is able to be calibrated, not that it needs it.
The Additional included Potentiometer for adjusting voltage is very sensitive with perhaps a 240 degree sweep from 12v to 15.5v, making it very difficult to really dial in voltage to the 0.01 of a volt.
Thinking about adding a 10 turn pot on a longer cable to reach dashboard of project vehicle. Powermax Unit will be close to batteries and likely not easily accessible.
The casing of the Powermax is not used as a heatsink, the internal finned heatsink runs the full length of the unit and I bet it would greatly benefit from a push/pull fan scenario, instead of just a pusher. Taking 0.25 amps to run the fan continuously is not an issue.
Increased dust accumulation however will be.
