Got the Mega Watt today
Well the build is on, got the MegaWatt S-400-12 today so the charger build has started once the other parts come in. Just might throw the battery cables on it and start charging tomorrow watching the ...
Forum Discussion
I have 45 amp anderson Powerpoles on my Meanwell rsp-500-15.
When I need to feed the battery, I plug in the Meanwell and wait the half second it takes before it clicks and powers up my Wattmeter.
Then I twist my 10 turn potentiometer to dial in ~14.65 volts give or take depending on temperature. I've got 0.1 to 0.2 volts drop on my 8awg to battery I account for too.
Then I mate the 45amp powerpole connectors and watch those 40 amps fly. Battery voltage drags down the Meanwell voltage to the low to mid 13's, depending on the battery state of charge. The watt meter shows total Meanwell output, my battery monitor shows how much of that is going into the battery. The difference is what is required to power loads I have running.
When Amps into my AGM battery taper to 0.4 at 14.4v, I twist pot slowly back down to 13.6v, but if the load on the battery is not great at that time, I unplug the powerpoles, quickly lower voltage to 13.6v, and wait for battery to drop to 13.5v and then reconnect.
If I twist the dial down too fast the overvoltage protection kicks in with a click, then another click when it goes back On, and can do this several times, so I usually unplug the powerpoles when the fridge compressor or laptop are not running and sucking up 3 to 6 amps and helping remove surface voltage.
These power supplies get quite hot when maxed out by a depleted battery.
My Meanwell now has quiet Noctua 80 and 60 mm fans on the lid in addition to the extremely powerful and loud 40MM fan it came with internally.
I also added heatsinks to the casing adjacent to the heat producing transistors which use the casing as a heatsink. Now the loud 40MM fan only comes on after 15 minutes at maximum output at 85f, and it shuts off when amps taper to 34. A 10 amp improvement compared to no external heatsinks.
At 75f ambient temps, the loud internal 40mm never comes on at maximum output.
The Noctua fans are very quiet.
I've probably got thousands of hours on the Meanwell now, holding my battery at my desired float voltage while powering all DC loads.
When I need to feed the battery, I plug in the Meanwell and wait the half second it takes before it clicks and powers up my Wattmeter.
Then I twist my 10 turn potentiometer to dial in ~14.65 volts give or take depending on temperature. I've got 0.1 to 0.2 volts drop on my 8awg to battery I account for too.
Then I mate the 45amp powerpole connectors and watch those 40 amps fly. Battery voltage drags down the Meanwell voltage to the low to mid 13's, depending on the battery state of charge. The watt meter shows total Meanwell output, my battery monitor shows how much of that is going into the battery. The difference is what is required to power loads I have running.
When Amps into my AGM battery taper to 0.4 at 14.4v, I twist pot slowly back down to 13.6v, but if the load on the battery is not great at that time, I unplug the powerpoles, quickly lower voltage to 13.6v, and wait for battery to drop to 13.5v and then reconnect.
If I twist the dial down too fast the overvoltage protection kicks in with a click, then another click when it goes back On, and can do this several times, so I usually unplug the powerpoles when the fridge compressor or laptop are not running and sucking up 3 to 6 amps and helping remove surface voltage.
These power supplies get quite hot when maxed out by a depleted battery.
My Meanwell now has quiet Noctua 80 and 60 mm fans on the lid in addition to the extremely powerful and loud 40MM fan it came with internally.
I also added heatsinks to the casing adjacent to the heat producing transistors which use the casing as a heatsink. Now the loud 40MM fan only comes on after 15 minutes at maximum output at 85f, and it shuts off when amps taper to 34. A 10 amp improvement compared to no external heatsinks.
At 75f ambient temps, the loud internal 40mm never comes on at maximum output.
The Noctua fans are very quiet.
I've probably got thousands of hours on the Meanwell now, holding my battery at my desired float voltage while powering all DC loads.
