Mean Well RSP-1500-15 Power Supply

MEX, these units are rock steady in voltage. Mine is on a month and a half at 13.34V. Hasn't waivered a bit. I have not tried putting a big load on it and seeing if voltage sags.

Yeah and non of this involves a twenty-two cent integrated circuit that pouts and snivels when it is told it is arrogant and stupid.

A new issue to ponder is X amount of amperes available on float voltage and voltage stays there until it is told to come out of it's room. Unneeded cycling shortens battery life considerably. A battery that short cycles three or four times a day does not have the lifespan of one kept on float until top charging is required, say every second or third week. Fifteen minutes max.

I am feeding this stuff in little chunks to digest easier.

The above obviously is for long-term power post connection. And yes it means substituting a power supply in place of an idiot smart converter.

Yeah, these things are impressive. Wait till you do not need a jeweler's screwdriver to adjust voltage. The 10 turn pot gives one a ridiculously powerful feeling.

I could not believe the 22$ cheapowatt's output. If only it was able to limit itself to 36 amps, I think my improved ventilation, and improved heatsink/case mating would have kept it running for quite some time.

I'm looking forward to Mex's upcoming Borg charger thread, once he gets his electrical goodie packages through customs, gets home, and has time to tinker.

He'll need to post up another pic of himself wearing his magnifying glasses, smoking soldering iron in hand, with his hair teased straight up and dual disemboweled cheapowatts on the Mad surgeon's table.

jrnymn7, batts wired as one bank. There's a link to them in my sig. LY, probably get a 1,2 switch and use the 30A Mega as the floater and the 36A Mega's as the charger OR just use the 36A's as both and keep the 30A as a spare. BTW, the Mega has NO problems doing equalizing and top charging in ~110F temps. One is not really supposed to be subjecting the batts to that kind of treatment at those temps but the batt temp never got above ambient so I figured it was ok. One time experiment. Won't be doing it again. It really is a little beast.

Fans and heatsinks and more fans, Oh my!

Truth be told, if i could have my RSP limit itself a bit more, in the 35 amp range, I'd be a bit more comfortable. But the extra fans and heatsinks lend confidence, and 40.94amps is impressive, and I do not regret the 127$ spent on it, nor the $22.59 spent on the cheapowatt, may it reset in smokey pieces.

"Truth be told, the 22$ cheapowatt was awesome at floating too."

That seems to be what these units are best at... mid range, long term, steady supply of VA's, at their given duty cycle. Problems start when running them near the top end of their range, unless you deal with excess heat, as LY did.

I think you're right Mena.
10 to 13% is Trojans recommended bulk current, and since you have no time limits, no generator...
10% of 740
74amps
36x2 is 72 amps.

Close enough, And the megawatts can go low enough to float properly at 100F. 13.8v be too high, be too high for an agm too

How would you employ your existing 30 amp megawatt?

I am impressed when floating with the MeanWell. The voltage holds rock steady, and my GTpower meter amp reading fluctuates as rapidly as it does when the GTpower meter is monitoring only this laptop, which is rapidly varying the amount of current it sucks up.

Truth be told, the 22$ cheapowatt was awesome at floating too.

mena661 wrote:
The reason why I can't justify it is because I don't charge the batts while camping. We're just weekenders and the bank is more than enough for our usage. I only charge at home. Normally the single MegaWatt 30A I have would be enough but since my converter is on the blink, I'm looking for a replacement. I've already tested the MW as a converter and it works great. I'm thinking two 36A units would replace the converter and allow adjustability based on the temperature. Here it can be 20F in the early morning in winter and 108F in the evening in the summer.

Yes, in that case...

Are you looking to charge one bank or two? Just curious... you have a huge bank, correct?

The reason why I can't justify it is because I don't charge the batts while camping. We're just weekenders and the bank is more than enough for our usage. I only charge at home. Normally the single MegaWatt 30A I have would be enough but since my converter is on the blink, I'm looking for a replacement. I've already tested the MW as a converter and it works great. I'm thinking two 36A units would replace the converter and allow adjustability based on the temperature. Here it can be 20F in the early morning in winter and 108F in the evening in the summer.

mena661 wrote:

jrnymn7 wrote:
Mena, How many amps do you require?

I'd really like a single 100 amp unit that didn't cost nearly $300. Not saying those units should be cheaper, just that I wish I could justify spending more on one. For now, I think two of the Mega 36A units will do. Besides it allows me to tinker.

I spent several hours today comparing and considering the Mega Watt 400-12's. Never became convinced it was the way for me to go in my situation. I'm seriously considering two turnigy 1080 watt 60 ampers, and I can't help but think they might possibly be the way for you to go? Granted, it would be about twice the cost of a pair mega watts, but your charging options would be mind blowing. And your compulsion to tinker could still be satisfied by custom tailoring charge sessions, perhaps?