A quick search on eBay for '48v rectifier' has made me realize it's definitely doable at costs much lower than off the shelf options...
I'll start with a few examples of what I've found.
I'm assuming one would need to figure out a way to adjust the voltage, unless you can find something pre-programmed.
(I apologize for the terrible links, I'm using the ebay app to share the item and copy the link.)
These look promising because you could parallel them together to hit your target and/or have the ability to scale them.
LOT OF 5 - Eltek Valere V1000A Power Supply 48v 20A Rectifier <br>USED ITEM - FINE WORKING CONDITION! <br>NO ACCESSORIES INCLUDED - CABLES, MANUAL ETC ARE NOT INCLUDEDCOMES AS PICTURED.PLEASE CHECK ALL PHOTOS. <br>You will receive 5 of these items. <br>ORDER WILL SHIP VIA UPS OR USPS.BUSINESS...
If you are looking for more details, kindly visit Eltek 48v rectifier modules.
This seems like an excellent price but you'd need more connectors.
Find many great new & used options and get the best deals for ELTEK Flatpack2 48V 2000W High Efficiency Rectifier: 241115.105 at the best online prices at eBay! Free shipping for many products!
This seems like a great option for our friends up North.
The Cordex HP 2.0kW is backward compatible with existing Cordex 1.8kW shelves and systems providing users an easy. > Backwards compatible with Cordex 1.8kW shelves and power solutions. temperature operation, HP series rectifiers are also ideal for harsh outside plant enclosure installations.
So what am I missing here? I feel like it has to be something substantial or it would already be a popular topic...
Based of the informative info recently posted by @ChrisFullPower in another thread I'm intrigued in DIY'ing a charger from used rectifiers.A quick search on eBay for '48v rectifier' has made me realize it's definitely doable at costs much lower than off the shelf options...I'll start with a few examples of what I've found.I'm assuming one would need to figure out a way to adjust the voltage, unless you can find something pre-programmed.(I apologize for the terrible links, I'm using the ebay app to share the item and copy the link.)These look promising because you could parallel them together to hit your target and/or have the ability to scale them.This seems like an excellent price but you'd need more connectors.This seems like a great option for our friends up North.So what am I missing here? I feel like it has to be something substantial or it would already be a popular topic...
Rectifier modules on
#1
Sameer Basheer
08-05-2014 02:01 PM
Start by08-05-2014 02:01 PM
Rectifier modules
We are using rectifier modules the load current in 63 A and the float voltage is 54.5 V. We are using 6 modules each has maximum dc output of 28.1 A. If 2 modules go faulty are 4 modules enough ?? Just to keep in mind that more than 80% efficiency cannot be used for modules.
We are using rectifier modules the load current in 63 A and the float voltage is 54.5 V. We are using 6 modules each has maximum dc output of 28.1 A. If 2 modules go faulty are 4 modules enough ?? Just to keep in mind that more than 80% efficiency cannot be used for modules.
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#2
Alan Maltz
08-05-2014 04:57 PM
08-05-2014 04:57 PM
Sameer, Since you have told us nothing about these modules except their efficiency (without defining it), how they are connected or the load, you can see that the output can be 4x28.4=113.2Amps, or 2x28.4=56.8A knowing what you know then you should be able to decide.
Alan
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#3
Sameer Basheer
08-05-2014 07:46 PM
08-05-2014 07:46 PM
I got that. Actually these are Eltek Flatpack 1500 48V DC rectifiers. We are using for telecom purposes. These are designed for 24KW power system. The problem is that in various sites these modules go faulty and sometimes we dont have new modules to replace the faulty one. So i just needed to know if load current is already provided and we have an idea that how much load single rectifier module is giving can we calculate the efficiency of these modules ?? These modules are also charging 155 AH battery bank 12V for backup. 4 batteries in one bank i.e 12x4V=48V.
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#4
Alan Maltz
08-05-2014 10:35 PM
08-05-2014 10:35 PM
Sameer, According to the manufacturer's datasheets those units have a MTBF (Mean Time Between Failure) over 350,000 hours, therefore it seems odd that you should have so many early life failures. I would be talking to the manufacturer about that to see if they can help you pinpoint the problem.
As far as efficiency, they are listed as 94% efficient with an option for 96.5%, certainly you can verify this by accurately measuring the output power and dividing by the input power.
It also list NiCd as the battery chemistry when used as a charger. It's best if you contact the manufacturer directly so that they can verify the overload capability.
Alan
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#5
Sameer Basheer
08-06-2014 01:13 AM
08-06-2014 01:13 AM
Thanks alot Alan
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