Meanwell PS creates a load?
Recently realized that my solar systems daily output had increased by ~50Wh per day when in storage with no shorepower. It was hard to believe that the parasitic loads or the battery self-discharge...
Forum Discussion
The secret is to find an isolation device that does not act like your banker: Charge you a fee to count and use your money.
Except for inevitable questions about lifespan, it is tough to argue against a top quality totally-automatic battery solenoid-separator. It has negligible voltage drop no issues when equalizing a battery. When the power supply circuit voltage drops below a certain value (cessation of charge) there is total and absolute isolation of the power supply. Again no thinking no sweat, automatic.
I was "encouraged" to use a Schottky based dual rectifier because of the twin power supplies of the Borg. No way was a pair of battery separators going to fit in the Borg's case. Why Schottky? Why 500 amperes rating? A typical automobile full wave bridge rectifier is going to see .8 - .9 volts drop at 40 amperes output. Paralleling all three phase rectifiers The Schottky has .22vf. Each Megawatt is connected to a separate anode. 40 amperes versus 250 amperes capacity.
The online full wave bridge rectifiers a person sees on eBay have superb components, commonly rated 1Kv PIV. But with those high PIV values come higher forward voltage drop. An eBay rectifier commonly develops 1.1 - 1.2 volts drop at or near full ampacity. Compare that to the 500 amp Schottky.
When building alternators I trusted nothing. Even new rectifiers got tested, graded and sometimes rejected. Selectable 25, 40, or 50 amperes and always 1Kv reverse leakage. Renard and Traanspo bragged they sold 200 PIV stuff. In reality about 98% of what I purchased passed 1Kv and 1ma PIV.
The 1200 ampere rectifiers I use in Quicksilver and the Delco 50DN are rated 1,675 PIV. These monsters have 2/0 braid leads with 1/2" terminal holes and 1-1/8" studs with extremely fine threads. Made in Vermont and used in the metal plating industry. Purchased through Barney Kaplan Supply, Detroit.
Isolating a power supply via rectifiers is more involving then doing it with a simple and relatively inexpensive battery separator.
Because of the 28 volt question I would tend to gently urge Mr. Brulaz, to consider the battery separator. Dinner for 3 at a nice restaurant would cost about the same.
Except for inevitable questions about lifespan, it is tough to argue against a top quality totally-automatic battery solenoid-separator. It has negligible voltage drop no issues when equalizing a battery. When the power supply circuit voltage drops below a certain value (cessation of charge) there is total and absolute isolation of the power supply. Again no thinking no sweat, automatic.
I was "encouraged" to use a Schottky based dual rectifier because of the twin power supplies of the Borg. No way was a pair of battery separators going to fit in the Borg's case. Why Schottky? Why 500 amperes rating? A typical automobile full wave bridge rectifier is going to see .8 - .9 volts drop at 40 amperes output. Paralleling all three phase rectifiers The Schottky has .22vf. Each Megawatt is connected to a separate anode. 40 amperes versus 250 amperes capacity.
The online full wave bridge rectifiers a person sees on eBay have superb components, commonly rated 1Kv PIV. But with those high PIV values come higher forward voltage drop. An eBay rectifier commonly develops 1.1 - 1.2 volts drop at or near full ampacity. Compare that to the 500 amp Schottky.
When building alternators I trusted nothing. Even new rectifiers got tested, graded and sometimes rejected. Selectable 25, 40, or 50 amperes and always 1Kv reverse leakage. Renard and Traanspo bragged they sold 200 PIV stuff. In reality about 98% of what I purchased passed 1Kv and 1ma PIV.
The 1200 ampere rectifiers I use in Quicksilver and the Delco 50DN are rated 1,675 PIV. These monsters have 2/0 braid leads with 1/2" terminal holes and 1-1/8" studs with extremely fine threads. Made in Vermont and used in the metal plating industry. Purchased through Barney Kaplan Supply, Detroit.
Isolating a power supply via rectifiers is more involving then doing it with a simple and relatively inexpensive battery separator.
Because of the 28 volt question I would tend to gently urge Mr. Brulaz, to consider the battery separator. Dinner for 3 at a nice restaurant would cost about the same.
