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Batterie cells voltage?

Paulfrench35

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Feb 20, 2023
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Hello, I'm French, sorry for my bad English.
I would like to know if it is better to build a 12v / 100Ah battery or a 24v / 50Ah? For what reason? Thanks you
 
Hello, I'm French, sorry for my bad English.
I would like to know if it is better to build a 12v / 100Ah battery or a 24v / 50Ah? For what reason? Thanks you
If your system is 24 volt build for that voltage, you have a better balance on the cells and also higher voltage means lower amps so you can use smaller wires and save money and easier to work with, capacity will be the same either way
 
I ain't hybrid inverters. I just want to build a storage system parallel to my solar system.

Building a 24v battery costs more because it takes twice as many cells compared to a 12v one. Wire size is the only reason?
 
What is your system you are trying to build is it a 12 volt or 24 volt do you have a inverter already if so what type what are you powering with this system
 
I have 10 solar panel of 395Wc and one inverter Hypontech HPS4000D.
I would like to be able to charge a battery with the solar surplus to cover my consumption for the night. So charger (AC -> DC) --> Battery --> Inverter (DC -> AC). In fact I want to make something like Ecoflow batteries.
 
Looking at that inverter it says nothing about using batteries, is it strictly grid tied? if so just get a Bluetti or eco flow and set it to charge during the daytime then run it at night
 
Doesn't look like that inverter is designed to work with batteries.
 
Another option would be a victron multiplus and a couple of Lifepo batteries for more capacity and cost would be similar
Ecoflow is very expensive, you can do the same thing for less money. Let's get back to the original question :)
 
Do you know how many watts are required at night 12 volt is good for 1000 to 1500 watts 24 volt is good up to about 3000 watts so we need to have a idea of what your needs are
 
Between 100 and 300w for the night so one batterie 12.8v / 100ah looks perfect?
If you are steady at the average of the quoted portion, assuming you meant watthours, then 100Ah at 12V nominal is 1.2kWh and 200W load would be ~6 hours tops; 300W load 4 hours max.
Building a 24v battery costs more because it takes twice as many cells compared to a 12v one. Wire size is the only reason?
It costs essentially the same per watthour for ether a 12V or 24V battery. The 50 amp hours of a 24V is the same as the 100 amp hours of a 12V- both are ~1.2kWh.
But I’m wildhat guessing that you need ~2.4kWh to be successful at your goal with a bit of headroom for convenience, comfort, and sanity.
 
This system will not be alone to supply the consumption of the night, the inverter used will be a grid tie with its output adjustable from 30 to 300w, the EDF network (in France) will complete what is missing.
 
Compressors ??
Fridges can run (like mine does) on 55W but when they start a cooling cycle they can be a lot of watts for a second or two. My current fridge bumps the inverter readout occasionally to something I’m guessing is 1400W but it happens so fast you can’t really read it. In the next second or two it will go to ~200+ watts and down to ~85W and soon - minute or so- thereafter will be 55-65W running.

It’s not just compressors but any inductive load starts hard- even a furnace motor or furnace fan.
 
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