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Wycabin
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# Posted: 26 Mar 2016 08:36am
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Hello, as with many, I suspect all of these watts, amps, and everything else don't work well with my brain. My question is about watt hours per day with
batteries. If I have 4 200 amp hour batteries on a 24 volt system, would I have 19200 watts to use each day from my batteries? I would only want to use half at most to save the battery life? Does that sound correct?
Thanks
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Just
Member
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# Posted: 26 Mar 2016 09:26am - Edited by: Just
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Are the batteries 6 or 12 volts each ? It makes a difference.
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Wycabin
Member
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# Posted: 26 Mar 2016 11:35am
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They are 12 volt 200 amp hour batteries.
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razmichael
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# Posted: 26 Mar 2016 11:50am
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If they are 12V batteries and you have them wired for 24V then your bank would need to two pairs of two in series wired n parallel. This gives you 400 amp hours to play with. 9Wired in series doubles the voltage to 24V and these in parallel double the amp hrs). Thus 9600 watts - 50% of which is 4800. What type of batteries are they?
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Wycabin
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# Posted: 26 Mar 2016 11:53am
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These are the batteries I was looking at:
AGM Battery Sealed Lead Acid 200 amps, 12 Volts.
Thanks for the info. To get the watt hours I initially said I would need 8 batteries?
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Just
Member
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# Posted: 26 Mar 2016 01:35pm
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AGM batteries are not the best choice for solar, lead acid deep cell are a better choice .
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razmichael
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# Posted: 26 Mar 2016 02:07pm
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As per what Just said, you really need to be careful what type of batteries you are getting - are they true deep cycle or hybrid (or4 just starter batteries), for example. Some more info on your overall system/plan might enable some people on the thread with lots of off-grid knowledge to assist. How have you determined your power needs needs? What source for recharging are you looking at, are you going to be running 120AC from the 24V? ... and the list goes on and on. Every part of the system is related and impacts other choices.
I'm making an assumption that you are new to this stuff based on your original question - apologize if this is not the case. Here is good (albeit out of date in some areas) site for general knowledge 12 Volt Side of Life Part 1 followed, as you might guess by part 2.
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MtnDon
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# Posted: 26 Mar 2016 02:19pm - Edited by: MtnDon
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Volts x amps = watts
Volts x amp-hours = watt-hours
How about four 6 volt L16 batteries in series for 24 volts... they come in a few capacities. 370 and 420 anp-hours are available.
Then you could have 24 x 420 = 10080 watt-hours with half available at 50% DOD.
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offgridjunkie
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# Posted: 26 Mar 2016 03:14pm
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Quoting: Just AGM batteries are not the best choice for solar, lead acid deep cell are a better choice .
Be careful with a statement like this- it is meaningless as a simple post. Yes, 5 or 10 years ago, Lead Acid was the way to go, but depending on how you store them, where you store them, how much depth of discharge you need, and at what rate you want to discharge or charge them, an AGM may be the right choice for a user. Yes they are more expensive and don't last as long, but we each need to look at our systems and what we need them to do before deciding.
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Steve_S
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# Posted: 26 Mar 2016 04:11pm
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Quoting: offgridjunkie Be careful with a statement like this-
Should be noted that several companies make AGM for Off-grid power systems. While I am not personally familiar with US Military kit (being a Canadian Vet and all) AGM Battery Packs have been used by our military for a very long time in all environments (read as extremes) and they have served well.
AGM is perfectly suited for many applications, especially intermittent usage and large temperature variation scenarios where normal FLA batteries would be hard pressed to accommodate.
New battery technologies are coming forward at an increasing speed and the entire market is shifting fast. That means like it always has, new tech will be more expensive but driving the older known tech lower in cost... Remember the $2000 Betamax ?
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Wycabin
Member
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# Posted: 26 Mar 2016 07:43pm - Edited by: Wycabin
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I appreciate all of your responses. I am not very
knowledgeable on solar power so I was trying to take
each step and understand it before moving to the next. I was looking at a kit from the inverterstore.com. I was trying to have a system that would use about 2000 watts a day (24volt system) and have a couple or a few days of battery power in reserve. I have a generator that can charge that batteries in case the weather is really bad for several days or I use too much power.
I appreciate everyone's responses and have looked at many posts to try and gain knowledge. The inverter store and a Missouri solar store? seem to have pretty good packages. Just trying to understand each piece before I move on.
all of your info helps
Thanks
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MtnDon
Member
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# Posted: 26 Mar 2016 10:01pm
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Keep in mind that there are more NON deep cycle 12 volt batteries than there areTRUE deep cycle 12 volt batteries. Don't blindly trust what some folks advertise.
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Steve_S
Member
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# Posted: 27 Mar 2016 06:49am
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The Inverter Store has some pretty good packages put together. Although their battery selection options are a bit lacking I'd say. Most of their kits are using the AIMS Pure Sine Inverter/Chargers which is similar to what I have... Not Cadi or Rolls Quality & $ but they work.
An advantage with an Inverter/Charger is that you get a charger designed for the purpose which can save you a lot of grief. Makes it much easier to run a 120V/30A from your generator to inverter for backup charging of your batteries if/when the need arises.
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