JohnRichard
New Member
- Joined
- Aug 24, 2022
- Messages
- 5
I've done a lot of reading over the past several months, and just discovered this wonderful community. I have some questions about battery bank size, electrical needs, and charging.
Without going into a lot of detail about what I am building, here is the most information I could gather. After an electrical audit to the best of my ability, all devices running at full power would use 1107 watts. I wanted to know how much capacity I would need to run everything for a full 24 hour period, and I think that's 27kwh ish. Does that sound correct? In reality, I know that figure will be lower, because I have to sleep sometime, and that figure also includes things like my radio broadcasting at 5 watts, charging a laptop continuously, lights on continuous. I wanted to be overly powered. Call it reserve capacity.
For the sake of ease, I chose to calculate with a 12v 135Ah battery. I will probably end up building my own using raw cells, but this made the math easier.
I assumed 24v system would do, but now I am thinking 48v will be better.
So - How many amp hours do I need to plan for? Using the formula I can find, 27kw / 24v = 1125Ah. But that doesn't seem right?
I know I am a beginner, I am just trying to wrap my head around this math.
135Ah battery can supply 1620Wh at 12v (Not taking into account the 20% reserve for lithium batteries). Correct?
Running batteries in parallel increases amp hour capacity. 10 batteries in parallel being 135ah 12v would give 1350Ah.
So 20 batteries in parallel, in two banks, wire in series, would give 24v and 1350Ah? Is that correct?
1350Ah x 24v = 32,400Wh - Is that enough to pull 1000w for 24 hours?
I will tackle charging this bank next, after I figure out exactly how many batteries I need. Thanks for any guidance provided.
Without going into a lot of detail about what I am building, here is the most information I could gather. After an electrical audit to the best of my ability, all devices running at full power would use 1107 watts. I wanted to know how much capacity I would need to run everything for a full 24 hour period, and I think that's 27kwh ish. Does that sound correct? In reality, I know that figure will be lower, because I have to sleep sometime, and that figure also includes things like my radio broadcasting at 5 watts, charging a laptop continuously, lights on continuous. I wanted to be overly powered. Call it reserve capacity.
For the sake of ease, I chose to calculate with a 12v 135Ah battery. I will probably end up building my own using raw cells, but this made the math easier.
I assumed 24v system would do, but now I am thinking 48v will be better.
So - How many amp hours do I need to plan for? Using the formula I can find, 27kw / 24v = 1125Ah. But that doesn't seem right?
I know I am a beginner, I am just trying to wrap my head around this math.
135Ah battery can supply 1620Wh at 12v (Not taking into account the 20% reserve for lithium batteries). Correct?
Running batteries in parallel increases amp hour capacity. 10 batteries in parallel being 135ah 12v would give 1350Ah.
So 20 batteries in parallel, in two banks, wire in series, would give 24v and 1350Ah? Is that correct?
1350Ah x 24v = 32,400Wh - Is that enough to pull 1000w for 24 hours?
I will tackle charging this bank next, after I figure out exactly how many batteries I need. Thanks for any guidance provided.
