Let’s just say

[Daddy Tanuki]

I'm mostly unsure if it's a full stop or a period


i would not expect "chargers" to play nice in parallel. You could get lucky, but I would not expect them to play nice, especially if they are trying to determine charge level and what point in the charge curve to use.

charging sources in parallel are fine as long as their settings are the same. i have four 60 amp morningstar MPPT-60 SCC in parallel no issues there. i can even fire up the genset and use the two chargeverters at the same time as they are all set ot the same parameters.

 

[didapper]

charging sources in parallel are fine as long as their settings are the same. i have four 60 amp morningstar MPPT-60 SCC in parallel no issues there. i can even fire up the genset and use the two chargeverters at the same time as they are all set ot the same parameters.

I meant series or parallel, I corrected it. Are yours synchronized in any way? I would expect devices of the same type _designed_ for this application could play nice. If either has any config differences, it could throw things off, maybe not as bad as series, but not ideal.

 

[Oabeieo]

Yeah, the 24 V system it’s just more basic entry level stuff. It’s a pair of renogy rover mppts , but I also have a extra pair as back up

And the manual says you can parallel them. I think it says up to four.

But if I wanted to series them to charge a 48 V battery I’m pretty sure I mean batteries don’t know the difference it’s potential so the potential at each terminal should only be the nominal voltage

Although it is a charger, so I’m sure there’s some weird shit that I don’t know but maybe I just was wondering if somebody’s electronically minded before I blow up two chargers, lol

 

[Oabeieo]

I know I could connect them in 24 V at the midpoint so it would be like one of them charges two of the 48 V batteries and the other charges the other two batteries so each charger would only see the 24 V battery

I know for a fact that works I mean the chargers are identical so they should balance just fine as long as they have the same amount of charge coming in so I could parallel the strings of solar going into those and it should run the same program essentially


But I was thinking series the actual charge controllers so that I don’t have to do any balancing

 

[justgary]

Don't get me started on fluid ounces vs ounces.

Awww, c'mon. How many ounces are in a pint? For that matter, a gallon? Heh heh heh.

Those of us who use both systems get pretty good at converting, and the conversions are easy enough to remember. Except for Stone. I refuse to work with Stone.

And your beloved metric system took a kick in the pants fairly early on so that one inch is 2.54mm and not some random number of additional digits. This is so we can use a 127 tooth back gear to cut metric threads on our Imperial lathes.

 

[Oabeieo]

Awww, c'mon. How many ounces are in a pint? For that matter, a gallon? Heh heh heh.

Those of us who use both systems get pretty good at converting, and the conversions are easy enough to remember. Except for Stone. I refuse to work with Stone.

And your beloved metric system took a kick in the pants fairly early on so that one inch is 2.54mm and not some random number of additional digits. This is so we can use a 127 tooth back gear to cut metric threads on our Imperial lathes.

 

[CommandoJoe]

I know I could connect them in 24 V at the midpoint so it would be like one of them charges two of the 48 V batteries and the other charges the other two batteries so each charger would only see the 24 V battery

I know for a fact that works I mean the chargers are identical so they should balance just fine as long as they have the same amount of charge coming in so I could parallel the strings of solar going into those and it should run the same program essentially


But I was thinking series the actual charge controllers so that I don’t have to do any balancing

Make sure the negative isn't connected to the ground / chassis. Depending on your system setup this could cause problems.

I have some 12v 100a server power supplies I was going to put in series to make a high current 48v charger. The metal case, AC ground, and DC negative were all tied together. I had to make some internal mods to separate them.

 

[didapper]

Awww, c'mon. How many ounces are in a pint? For that matter, a gallon? Heh heh heh.

Those of us who use both systems get pretty good at converting, and the conversions are easy enough to remember. Except for Stone. I refuse to work with Stone.

And your beloved metric system took a kick in the pants fairly early on so that one inch is 2.54mm and not some random number of additional digits. This is so we can use a 127 tooth back gear to cut metric threads on our Imperial lathes.

off the top of my head, I don't know or care. 4, 8, 16? who has time to memorize this stuff honestly.

an inch is 2.54mm? that's a tenth of an inch, a common through hole pitch. Oh how I dream it was 2.5mm (metric). It's honestly a real annoyance to work around designing stuff.

What is an inch defined by? the meter is defined by the speed of light which is pretty cool, and useful scientifically. Imperial definitions date back to days when decimals literally hadn't been invented. Fractions can be useful, but at the time they were more of a limit.

 

[Daddy Tanuki]

I meant series or parallel, I corrected it. Are yours synchronized in any way? I would expect devices of the same type _designed_ for this application could play nice. If either has any config differences, it could throw things off, maybe not as bad as series, but not ideal.

the four solar charge controllers are on a modbus link and synch, the charg-verters are stand alone. but it is not a problem. the individual components will only charge to what you have them set at.

 

[Daddy Tanuki]

let me put this out there... you cannot series wire multiple charging source and expect anything to survive... the first unit will push 13.4.... the next one will see 13.4 and throttle down... that is if you are lucky. other wise it puff the magic dragon and the magic blue pixeies get released.

 

[Oabeieo]

Make sure the negative isn't connected to the ground / chassis. Depending on your system setup this could cause problems.

I have some 12v 100a server power supplies I was going to put in series to make a high current 48v charger. The metal case, AC ground, and DC negative were all tied together. I had to make some internal mods to separate them.

Aaah yes , I see , the series junction “could” be “seen” as a +/- 24v

Yes would have to be isolated cases and such indeed , mounted to non conductive paths…

But theoretically, should work aye?

 

[Oabeieo]

let me put this out there... you cannot series wire multiple charging source and expect anything to survive... the first unit will push 13.4.... the next one will see 13.4 and throttle down... that is if you are lucky. other wise it puff the magic dragon and the magic blue pixeies get released.

What if I wrap it in Saran Wrap so the genie can’t get let out …… (he he )



Ok what if I series them so 1 is on battery output and the other is series to its load output , that way only 1 charge controller runs a program and manages both. (How u like them apples, pretty smart huh lol )

 

[CommandoJoe]

let me put this out there... you cannot series wire multiple charging source and expect anything to survive... the first unit will push 13.4.... the next one will see 13.4 and throttle down... that is if you are lucky. other wise it puff the magic dragon and the magic blue pixeies get released.

I beg to differ Tanuki-san...

D

Thread 'AC based charging using server power supplies'

Dec 30, 2020

I have been tinkering with an emergency battery/inverter system and part of the plan is to be able to charge from a generator if there is not much sunshine. If I could get enough charge in the battery to carry critical loads overnight, that would be great. I have a 24v battery and found you can connect 12v computer server power supplies in series. I purchased two HP supplies, each rated for 850watts at 120v or 1000watts at 240v. There is a modification that can be done so the 12 max limit is removed and with resistors or a pot, you can adjust the output. They will still regulate to...

• DThames
• Replies: 59
• Forum: Show and Tell

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[justgary]

off the top of my head, I don't know or care. 4, 8, 16? who has time to memorize this stuff honestly.

an inch is 2.54mm? that's a tenth of an inch, a common through hole pitch. Oh how I dream it was 2.5mm (metric). It's honestly a real annoyance to work around designing stuff.

What is an inch defined by? the meter is defined by the speed of light which is pretty cool, and useful scientifically. Imperial definitions date back to days when decimals literally hadn't been invented. Fractions can be useful, but at the time they were more of a limit.

Sorry, yes, 25.4mm (2.54cm) per inch. It was late when I posted. The inch was defined as three barleycorns, dry and round, placed end-to-end lengthwise. Since 1959, it is defined as 2.54cm. So indeed, we do use metric measurements when we use inches.

The curious thing about pints and gallons is that the US uses 16 oz per pint while the British pint is 20 oz. That means that the US gallon is 128 oz, while the British gallon is 160 oz. This is why British people always think that the US makes only gas-guzzling cars since their cars can go so much further on a gallon of gas.

 

[didapper]

Sorry, yes, 25.4mm (2.54cm) per inch. It was late when I posted. The inch was defined as three barleycorns, dry and round, placed end-to-end lengthwise. Since 1959, it is defined as 2.54cm. So indeed, we do use metric measurements when we use inches.

The curious thing about pints and gallons is that the US uses 16 oz per pint while the British pint is 20 oz. That means that the US gallon is 128 oz, while the British gallon is 160 oz. This is why British people always think that the US makes only gas-guzzling cars since their cars can go so much further on a gallon of gas.

in other words, non-metric systems barely (barley) make sense to use

 

[Recovering EE]

i don't have a lot of good things to say about the french, but the statue of liberty, metric units, guillotines, and some good food are reason enough to keep them around, not sure what I have to say about you

Except that the plaque on the Statue of Liberty needs removal. According to the new powers-that-be, it no longer applies.

 

[justgary]

in other words, non-metric systems barely (barley) make sense to use

Trump keeps the three official, certified barley corns in his pocket.

 

[Recovering EE]

Trump keeps the three official, certified barley corns in his pocket.

"People are saying" that he mistakenly ate them yesterday. Confused them with a crunchy bit of KFC, that got away from him.