Originally Posted by neale

Hi Guy's If posting on the wrong forum, let me know. I bought 2 HP 750 watt PSU, for conversion to 24v output, with one as the float, and set voltage to 12.5 each, so far no prob. The question is can I pull 12 volts off just one , while supplying 24v to my other chargers, or can I only do one or the other? If I can do both, which psu do I take the 12v from? And if not I assume I need to run a switch so only one is powered, what is the best method to do this? Or just better to buy another PSU for dedicated 12v operation?

Neal

Neal Just saw this today.
Yes you can take 12V from one supply and still use the 24V output.
Take the 12V from the grounded power supply. It will save you grief.
On my website you will see power supplies wired for 12/24V.

John61CT -
For the 4010 Duo;

Maximum Charge Power 2000W at >34V
Input Current 65A

So to 'max it out' you'll need about 34V and 65A INPUT
Input will be about 2,200W to get 2,000W out.
So you will need three 12V power supplies in series or a ~36-48V power supply.
I have tried to make 36V and 48V power supplies from 12V power supplies but they don't last very long. My guess is that some component(s) do not like being floated that far from ground.
FYI even generators recommend grounding. Read the instructions. I would never recommend running without a ground.
I can build a 69A or 75/100A 12/24V supply that will work reliably but not 36V.
What are you charging that you need 2,000W?

Originally Posted by feathermerchant

John61CT -
For the 4010 Duo;

Maximum Charge Power 2000W at >34V
Input Current 65A

So to 'max it out' you'll need about 34V and 65A INPUT
Input will be about 2,200W to get 2,000W out.
So you will need three 12V power supplies in series or a ~36-48V power supply.
I have tried to make 36V and 48V power supplies from 12V power supplies but they don't last very long. My guess is that some component(s) do not like being floated that far from ground.
FYI even generators recommend grounding. Read the instructions. I would never recommend running without a ground.
I can build a 69A or 75/100A 12/24V supply that will work reliably but not 36V.
What are you charging that you need 2,000W?

Mostly maintenance protocols (balancing, equalizing, load testing) on 2V-6V deep cycling PB cells, minimum 200AH, and also 60-180aH LFP cells at 3.2V. Normal cycling duty of assembled banks, 400-1600aH, handled by much bigger charge sources.

Often mobile off-grid, marine, RV, expedition trucks, often will be able to assemble a big enough 36-48V bank to act as source, but not always, and then charger not available for supporting input.

3kW+ gensets are often available, but may be 110V not 240.

I want to be able to make full use of 4010Duo when upstream power source is available.

Ability to feed concurrently from two separate 110V 15A circuits would really be ideal.

I'd really rather not carry multiple different sets of PSUs just to handle both 110/240 inputs.

EPS120, 51.4V is going that high, too stressful for 4010Duo longevity?

Ground may simply not be available, even a 2m rod into dry desert earth not great. Middle of the Great Lakes dunno, not a sparkie, would rather a design assuming none.

IBM xSeries x336 PSU, 585W, 48A @12.2V

Chicony OR Acbel 24R2639 API3FS25 24R2640

So two pairs, all series'd ?

* 4 = 48.8V 2340W

_______
Edit, getting excited, world voltage? Switches between
100-127v input 12.2V/53.3A
200-240V input 12.2/106.5A

Also,

HP DPS-1200FB
1.5″ x 7.75″ x 3 1/2″ 2lb!
900W at 120V input, 1200W at 220V
12V, adjustable 11.7 - 12.7V
pairs, 1800W / 2400 @ 24V
2 pairs well over 3kW available on either mains input

The DPS 1200FB is what I sell. Not reliable with more than 2X in series.

Most reliable I sell are 12V 69A. Two in series works great and almost no returns ever.
Artesyn 7001138
IBM 24R2730

120-240V input.

You might want to look at a charger such as the one in the Tesla Model 3. It is 120-300V AC input and about 11kW. The battery pack is about 400V DC. It is digitally controlled and liquid cooled. You may be able to get one from a salvaged car.

bit overkill for a 2kW need 8-)

Does the max of 2 in series hold for all PSUs do you think?

What about using a pair of the HP DPS-1200FB separately powered each from its own circuit or genset?

Would using a battery to buffer the input help?

How about a DCDC boost converter to get volts up and keep amps below 60?

I guess I'd settle for 1800 for just 110AC sources, knowing I'd be able to max out if needed just find a 240AC outlet.

My opinion is 2 in series is the limit. I don't know why. I've never been able to tell what fails.
You could use a boost converter to get the volts up from 24 to say 40 or so. It would have to be capable of 70A though.
If I were you, I'd try the 24V 69A and see how far it takes you.

This is my current path, to get max use out of the iCharger 4010-Duo
https://www.rcgroups.com/forums/show...Duo&p=40907507