landyacht318 wrote:
Niner, did the Megawatt actually come with documentation?
I might very well purchase one, the 400 watt model, but first I want to see if I can fix the cheapowatt. New transistors and sil pads Supposed to be here Monday.
Even if I can fix it, I'll likely get a PSU which will not smoke itself or needs to be monitored so it does not.
I've not ruled out a Meanwell either.
Interesting mention of the 'hiccup mode'
On MeanWellsFAQ page,
MEAN WELL has ESC, SC, PA, PB series for battery charger purpose (120~360W). If these series does not meet customers' demands and they like to choose a power supply as a charger, we advice to pick up one which over load protection (OLP) mode is constant current limiting. The models in this mode provide constant current even when the protection circuit is triggered.
The second choice is fold-back current limiting or constant wattage model. In this model, when a battery is running low, the output current of the power supply will gently increase. The level of increase depends on battery's capacity and degree of exhaustion.
Hiccup or shut down model are not recommended because it will stop to generate current when OLP happens.
Love the chingrish.
I want to know what happens when a megawatt is taxed to the max, not what the website claims it will do.
to migrate surpriseat 25 degrees the mean well was showing 40 amp output at startup
the rate quickly fell at about 1 amp per second such that at about 20 seconds I was showing 20 amps input where it stayed and held.
This statement does not fill me with confidence in the Megawatt. But perhaps it says more about your battery.
What size wire and how long a run?
Have you seen it hold 30 plus amps for 30 minutes?
Oh love that smart phone dictation translation... "to my great surprise, at 25 F"
2 feet of 8 gauge wire. Copper. I use mine as portable. Right next to the exposed battery sitting on the tongue of the travel trailer.
I don't have enough battery bank, nor do I run my battery low enough in charge... It has a usable 75 Ah for 50% SOC. Whack off 15 amps off that if you charge 50 to 90%, or 60 Ah.
