icecube57 wrote:This is sorta the out Im looking for but hell Im thinking about just getting another meanwell to series with my current hacked one... a few bucks more I can just get another power supply. Im not knocking your find i think its awesome but man ur like 10-20 bucks away from doubling raw power.. Seem like there would be some bottle necking and not being able to unleash the full potential.
auraslip wrote:You are a very creative man docbass -
I'm curious how this works out!
What dc-dc did you order?
icecube57 wrote:It would be nice to current limit them to where you could run two dc to dcs off 1 48v Meanwell. Even if the output was 250w total I would be happy with such a flexible power supply.
Nuts&Volts wrote:That's one of those things I'll have to figure out. I'm hoping there is some kind of mod that I can do to limit the current, that's what im going to continue reading about. If I can make both work together or one work with the DC/DC I'll have high power (1.5-3kW) charging for ~$120 which is $200 less than my other options.
I also read that the PSU will act as a CV charger once the delta_V between the PSU output and the battery pack is low enough.
If anyone has any suggestions for limiting the current then let me know.
Nuts&Volts wrote:I think i let some magic smoke out
First dumb thing i did was i hooked up the PSU, DC/DC setup up backwards on the battery (+ to +). The meanwell RSP is fine and think the DC/DC simple blocked any current from flowing so nothing, but heat was generated here.
So I flipped the connections and checked that the DC/DC had a voltage output, which it did. I had about 94V from the PSU and DC/DC side and wanted to connect it to a 84.5V battery. When i did this thou (both with the input power on or off) the DC/DCs went into limiting (lots of buzzing) then after awhile something started to smoke a little bit. That could have been some solder or insulation, but the DC/DC were just heating up so im not entirely sure whats going on.
Any ideas what i should try. I may trying removing the current sharing function OR remove the trim resistor, lower the V on the meanwell and see what happens.
edit: pretty sure the 3 DC/DC are cooked. I get no voltage out of them. I have 4 others that I will be a little bit more careful with
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