A: As far as capacity goes it's the same. However, 2 100 ah batteries would be better than 1 200 ah battery.
Connecting a battery in parallel is when you connect two or more batteries together to increase the amp-hour capacity. With a parallel battery connection the capacity will increase, however the battery voltage will remain the same.
200 Ah battery gives the maximum backup time as compared to 100Ah and 150Ah batteries for an identical battery voltage. Whereas a 150Ah battery gives more backup time than a 100Ah battery and 100Ah gives the least backup time.
Batteries last longer in parallel, because the voltage remains the same, but the amps increase. If you connect two 12v 50ah batteries in parallel, it will still be a 12 volt system, but the amps will double to 100ah, so the batteries will last longer.
The total capacity is the same a single 200ah battery is very heavy with two 100 ah batterys there is more wiring but easier to move and fit into different spaces and if you want to go to 24 volts you just need to change from parallel to series.
You can imagine that one of the most frequent questions regarding the 100 amp hours batteries is this one: “How long will a 100Ah battery last?” A 100Ah battery can last anywhere from 120 hours (running a 10W appliance) to 36 minutes (running a 2,000W appliance).
And for how long? Four 200ah batteries is equal to 9.8 kwh or around 9600 watts. This is enough to run essential home appliances like a refrigerator, six light bulbs, a TV and a laptop charger for 3.9 hours.
To join batteries in parallel, use a jumper wire to connect both the positive terminals, and another jumper wire to connect both the negative terminals of both batteries to each other. Negative to negative and positive to positive. You can connect your load to one of the batteries, and it will drain both equally.
If you're using a 12V 100Ah lead acid battery, you can expect the fridge to run for about 30-50 hours because lead acid batteries can only be discharged to 50%.
Up to two batteries can be put in parallel. To combine batteries in parallel, connect positive to positive and negative to negative as shown in Figure 4 right. It is important to use the same battery model with equal voltage and never to mix batteries of a different age.
Can I connect 200ah with 100Ah battery? Yes, you can for as long as the internal resistance of each battery contributes to a drooping, Voltage/battery current characteristics so that the voltage of each battery will settle to 12 volts.
You need around 610 watts of solar panels to charge a 12V 200Ah lithium battery from 100% depth of discharge in 5 peak sun hours with an MPPT charge controller.
Charging your battery at 12 volts and 20 amps will take five hours to charge a 100 amp hour battery. By multiplying 20 amps by 12 volts, 240 watts is how big of a panel you would need, so we'd recommend using a 300w solar panel or 3 100 watt solar panels.
Two or more 12-volt batteries wired in parallel—positive to positive, negative to negative—is still a 12-volt system. Two or more 12-volt batteries wired in series—the positive terminal of one battery connected to the negative terminal of a second battery—develops 24 volts, but amperage doesn't change.
We strongly recommend you DO NOT attempt to mix battery sizes (amp-hours) and connect together. Due to differences in battery management systems and battery cell counts, there may be a charging and voltage discrepancy between batteries.
When two or more batteries are placed in parallel, the voltage in the circuit is the same as each individual battery. That is two, three, four or more 1.5 volt batteries in parallel will produce a voltage of 1.5 Volts!
A 2000W inverter will need 3 x 120Ah batteries.
So for most weekenders a 100-120AH battery is more than enough to power your fridge and LED lights for a night or two. For more serious campers it becomes a lot more critical to make sure that you have enough battery storage so you are not left stranded in the middle of nowhere with no power to run your appliances.
The great thing about 12v fridges though is that they do not have to be running all the time and tend to hold their temperature better than an esky.
Connecting batteries of different voltages in parallel
primary (disposable) batteries – they are not designed to take a charge and so the lower voltage battery is likely to overheat, it may leak or bulge and in extreme circumstances where the voltages are very different, it may explode.
We would strongly discourage anyone from connecting batteries in series or parallel applications, if the batteries are not identical in age, size and type. It sounds like your batteries are different in each of those ways.
There is no theoretical limit to the number of batteries that can be connected in parallel. As more batteries are paralleled together, the risk of one faulty battery affecting the entire battery bank increases.
Your 2000-watt inverter can run through a 200 amp-hour battery in an hour when running at full power.
If you have a 200ah battery, it can supply 20 continuous amps for 10 hours or 10 amps for over 20 hours. The term voltage in a battery refers to the difference in electric potential between the positive and negative terminals of a battery.
For example, let us convert 200 Ah at 12 V to kWh. (200 Ah x 12V) ÷ 1000 = 2.4 kWh or 2400 watts of energy can be consumed in one hour.