Hi all,I am planning to install a Mean Well RSP-1500-15 100A power supply about 3 feet from the batteries. Will this work to fast charge the batteries from 50% SOC to 80% SOC?Should I install a fuse on the POS+ wire between the Mean Well power supply and the batteries?More information:The Mean Well will be used to fast charge the batteries when off grid, with AC power from two Honda EU2000i generators.Mean Well RSP-1500-15 SpecsI plan to use 1 AWG wire to connect the power supply directly to the batteries. The wires will pass through a sheet metal wall (battery compartment). I will drill holes and install grommets.The batteries are four Trojan T-125, total 480AH capacity.A spring wound 2 hour timer switch will connect the power supply to a 20A AC circuit. The trailers power cord will plug into the generator.The trailer also has a 200W solar panel installed by Cedar Creek.When plug-in AC power is available, an IOTA 55A converter will be used. The Mean Well is only for when off grid.The biggest power user is a residential refrigerator, I estimate 150AH use per day through a WFCO 1000W inverter.Am I on the right track? Will this work?Is a fuse needed between the power supply and the batteries?ThanksChris

Typically I would say a 120 amp fuse is needed close to the battery. I might make an exception for the described conditions. I would double protect the wire through the wall and go with no fuse.

I would be a little concerned about 15v12v is not high enough for chargingAnd 15v is a bit high, for anything more than few minutes kick in the pants aka equalizeIt's not adjustable it is selectable, meaning you can't get a voltage between the selectionsMaybe Mexicowanderer will see this and give his opinionHe's are battery expert,

MrWizard wrote:I would be a little concerned about 15v12v is not high enough for chargingAnd 15v is a bit high, for anything more than few minutes kick in the pants aka equalizeIt's not adjustable it is selectable, meaning you can't get a voltage between the selectionsMaybe Mexicowanderer will see this and give his opinionHe's are battery expert,OP here.My apologies, I typed the wrong model number. I edited the Mean Well model number from RSP-1500-25 to RSP-1500-15 (typo), but the link to the specs is the same.My understanding is this unit has a potentiometer to adjust the voltage in the range of 13.5V - 16.5V. That's on the 6th line of the specifications. Did I misunderstand? Were you getting 12V and 15V from the first line of the specs?I am planning to adjust it to 14.8V. Trojan specs Bulk Charge 14.8V, Absorption 14.1-14.7V.ThanksChris

I did not find specs on the "Power Supply" but I rather like 3-stage converters. I don't like "power Supply" for battery charging.As to the fuse.... if the unit does not have an internal fuse YES you need a fuse. fuse is a must.. I mean how else is a 35 dollar Transistor supposed to blow in order to protect a 35 cent fuse.. Only in the 100 amp range it's more like 300 dollar transistor and 30 dollar fuse. :)

wa8yxm wrote:I did not find specs on the "Power Supply" but I rather like 3-stage converters. I don't like "power Supply" for battery charging.As to the fuse.... if the unit does not have an internal fuse YES you need a fuse. fuse is a must.. I mean how else is a 35 dollar Transistor supposed to blow in order to protect a 35 cent fuse.. Only in the 100 amp range it's more like 300 dollar transistor and 30 dollar fuse. :)The specs are at the link I included.Here is the link again: Mean Well RSP-1500-15 specs It opens a PDF file.The specs say it has "Overload Protection, 105 ~135% rated output power, Protection type : Constant current limiting unit will shut down o/p voltage after 5sec. Re-power on to recover". I don't know if that is sufficient protection or is a fuse still needed.

Will this work and do I need a fuse? Mean Well power supply

wa8yxm
Explorer III
Nov 21, 2016
I did not find specs on the "Power Supply" but I rather like 3-stage converters. I don't like "power Supply" for battery charging.

As to the fuse.... if the unit does not have an internal fuse YES you need a fuse. fuse is a must.. I mean how else is a 35 dollar Transistor supposed to blow in order to protect a 35 cent fuse.. Only in the 100 amp range it's more like 300 dollar transistor and 30 dollar fuse. :)
racer4
Explorer
Nov 21, 2016
MrWizard wrote:
I would be a little concerned about 15v
12v is not high enough for charging
And 15v is a bit high, for anything more than few minutes kick in the pants aka equalize
It's not adjustable it is selectable, meaning you can't get a voltage between the selections

Maybe Mexicowanderer will see this and give his opinion
He's are battery expert,

OP here.

My apologies, I typed the wrong model number. I edited the Mean Well model number from RSP-1500-25 to RSP-1500-15 (typo), but the link to the specs is the same.

My understanding is this unit has a potentiometer to adjust the voltage in the range of 13.5V - 16.5V. That's on the 6th line of the specifications. Did I misunderstand? Were you getting 12V and 15V from the first line of the specs?

I am planning to adjust it to 14.8V. Trojan specs Bulk Charge 14.8V, Absorption 14.1-14.7V.

Thanks
Chris
MrWizard
Moderator
Nov 21, 2016
I would be a little concerned about 15v
12v is not high enough for charging
And 15v is a bit high, for anything more than few minutes kick in the pants aka equalize
It's not adjustable it is selectable, meaning you can't get a voltage between the selections

Maybe Mexicowanderer will see this and give his opinion
He's are battery expert,
time2roll
Nomad
Nov 21, 2016
Typically I would say a 120 amp fuse is needed close to the battery. I might make an exception for the described conditions. I would double protect the wire through the wall and go with no fuse.

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Will this work and do I need a fuse? Mean Well power supply

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