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Forum Index : Other Stuff : Isolating multipul DC supplies from a single Inverter.

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Old Seagull Man
Regular Member

Joined: 21/12/2019
Location: Australia
Posts: 55
Posted: 06:42am 25 Sep 2022
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I remember reading something written by one of the very knowledgeable members, about charging telecom battery's in i think it was Phone towers.

And they were saying that the system had a number of 48v battery packs, with charging systems. and they all feed a common output. So the battery sets charged with out effecting each other. And i think they used 3 phase diode packs to isolate the load from the separate power sources.

I have a number of 48v Dc packs and what to do the same. Two have old Flexmax chargers, and One has a 150/70 victron. AS they are quite different in capacity, just forming one big pack is not practicable. the packs are. 750Ah 550Ah and 210Ah

Sorry to be so long winded.
 
mab1
Senior Member

Joined: 10/02/2015
Location: United Kingdom
Posts: 146
Posted: 11:56am 26 Sep 2022
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I'm not sure i understand what you are trying to achieve.

If the battery packs are the same voltage (and same chemistry - sometimes even different chemistries can be paralleled if min and max voltages are restricted) then running them directly in parallel (for charge and discharge) should not be an issue. So the 1st question is: why can you not charge them in parallel?

Whilst it can be done to connect multiple packs via diodes to a single load,  it would be a lossy way of using the power. For small loads at 48v that might not matter, but the size of your battery packs might suggest you might be thinking of connecting a larger load such as an inverter, in which case i would want 'ideal' diodes, and you would still lose some power, plus you would have to be careful about exceeding the ideal diode ratings. So i guess my 2nd question is what sort/size load(s) are you wanting to connect to the paralleled batteries?

Edit: just to say i was thinking you were going to connect an inverter when i was writibg the above, but didn't see a reference to an inverter in your post; just realised it was in the title
Edited 2022-09-27 05:01 by mab1
 
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