CaravansPlus: Calculating How Big Your Battery Needs To Be (2023)

Contents

  1. 1) How Will We Measure Power?
  2. 2) How Many Amp Hours Do You Get From A 100ah Battery?
  3. 3) Battery Types
  4. 4) Excessive Draw Rates
  5. 5) Getting Less Than A Full Charge
  6. 6) Calculating Your Amp Hours

How long will my RV battery last?

If you have a Camper trailer, Caravan or other RV and you like to spend time away from a 240 volt power source, this article will give you some answers that the sales people avoid. It will allow you to estimate the size and number of batteries that will suit your camping.

As always there is a little explanation required to ensure that we are at the same starting point. The aim is not to make it complicated, but to explain it so it makes sense.

A blank calculation sheet can be downloaded from the end of this article, however we recommend you spend a few minutes reading why and how it works.

See also a related article: "Everything you need to know about installing solar panels."

How will we measure power?

The amount of electricity used to run a device or appliance may be defined as watts or as amps. If you know one you can calculate the other, provided you know the voltage.

We want to deal in Amps, as that is how the Deep Cycle batteries are rated. It is widely accepted at this stage that Deep Cycle batteries are the best option for RV use. We recommend the AGM style (Absorbed Glass Mat) as the best for any Recreational Vehicle, but you can research this more if you want.

A 100ah battery should provide 1 amp for 100 hours, 2 amps for 50 hours, 3 amps for 33 hours etc. It would be nice if this equation held true all the way up to 100 amps for 1 hour, but there are some limits to the maximum rate of current draw, and how much of that 100amps you can actually use without destroying your battery. We will get to those after you understand a few more things, but for now we want to know how many amps stuff uses.

Below: A simple example, but heavy user of power is a 12 volt hair dryer rated at 10 amps. A 100 ah battery should give you (100/10=10) 10 hours of usage.

CaravansPlus: Calculating How Big Your Battery Needs To Be (2)

If you use it for 5 mins a day, it could last 120 days. Happy wife, happy life.

If a device specification does not include amps but does include watts, the formula you need is:

Watts / Volts = Amps per hour

Below: An example where we need to calculate the amps. A very small user of power is a 1.2 watt LED light running on a 12 volt power source will use 1.2W / 12V = 0.1 amps. Therefore a 100ah (amp hour) battery will last for 1000 hours.

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CaravansPlus: Calculating How Big Your Battery Needs To Be (3)

A slightly different example is a 60 watt fridge running on a 12 volt power source uses 60 /12 = 5 amps, but only while the motor runs.

CaravansPlus: Calculating How Big Your Battery Needs To Be (4)

60 watt fridge ....divided by....12 volt battery....uses 5 amps of electricity (when running)

But....the fridge motor does not need to run all the time, in fact this model indicates it only needs to run about 15% of the time. 5 amps by 15% = 0.75ah/h. This fridge can operate over a period of 133 hours, or 5.5 days if the guidelines** are meet.

**Guidelines may be exceeded or not reached. For example this chest fridge used at Thredbo in winter may last 300 hours, but in Darwin in summer only 72 hours if you keep exchanging the beer!

How many Amp Hours do you really get from a 100ah battery?

Amp Hours (ah) is the rating used by Deep Cycle battery manufacturers as a way to compare batteries, but we cannot just measure how many Amp Hours are left in a battery. We can use a voltmeter to get the voltage, and this can be used to get a good approximation. You need to know a few things first.

1) Low voltage cut off

First, you cannot use 100% of a battery for anything useful. To understand this, look at the following chart comparing a conventional Wet Cell battery and an AGM battery where the voltage reading shows approximate charge left.

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Figure 1: Voltage indicating charge left.

If you have a 12V battery system, then one of the most useful items you can have is a Voltmeter. An effective one we sell is shown below. It plugs into a cigarette lighter socket and shows the voltage of your batteries. If you already have a multimeter it will also work.

Projecta - Digital 12/24V voltmeter $45.95View

When you have finished charging your battery you may get a reading well over 13 volts, however this will be a surface charge and will settle to a real reading of around 13 volts in an AGM battery or 12.6 volts in a Wet Cell battery. If you have a small load on your battery, say a couple of lights, the reading you get from your voltmeter when compared to the table or chart above, will show approximately the remaining battery charge. A moderate or heavy load will give a distorted reading until the batteries have rested and the charge equalises.

Looking at Figure 1 above you will notice that 12.1 volts AGM, or 12.1 volts for Wet Cell indicates you have used 50% of the capacity of the battery, you should have 50% remaining.

However, once you get to around 30% remaining the voltage will not be sufficient for most appliances, you may get a light to work but your water pump will not work very well. Using a battery below these levels will also severely reduce the number of recharge cycles you get from your battery.

Battery chargers like the SETEC (there are others) control the current draw from the battery as well as charging the batteries. These will prevent you drawing current from the batteries once the voltage drops below the ideal minimum level.

Most battery manufacturers indicate you will get the longest life from a battery by only discharging to 50%. This maybe the ideal case, but in an RV when you have to buy an extra battery, find storage space and pay for vehicle fuel to cart extra batteries that weigh about 30kgs each, I believe it is not unrealistic to allow for discharging to 40% or even 30% on those longer stays or when your other charging options don't work out. Yes, you may need to replace your battery a year earlier, but you have made savings along the way. Just one night away from a caravan park will save $30 plus extra weight for ever kilometre you travel.

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Again it is important to note that the voltage shown will only be accurate if there is at least some load, but definitely not a load exceeding 5% of the batteries capacity. If the battery has just been charged or heavily discharged, it must be given time to equalise before taking a reading.

Using a water example, imagine 6 tanks of water (like 6 cells in a battery) each joined together with a straw. If you fill one end tank using a garden hose or drain the other end using a garden hose it will take some time for all tanks (or cells) to be at equal levels.

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The time it takes to equalise is something you will get used to, you certainly don't panic if your voltage drops down while you use the microwave for a couple of minutes (inverters can consume quite a bit of power while in use). A low load that is drawing power no faster than the battery can equalise will give a reasonable value for the Charge remaining, by reading the voltage.

CaravansPlus: Calculating How Big Your Battery Needs To Be (8)

Be aware also, that a battery under no load at all may still show 12V, but have little or no amp hours left.

There are a few advanced gauges that will calculate your capacity based on actual recent usage, but the cost is still beyond most recreational users. They are more like a mini computer taking and recording sample data and making predictions of capacity remaining and how long it will last if you continue to use it at the present rate. See Below:

BMPro BatteryCheck 100 - Wireless Battery Monitor 5 In Stock Now. $230View

Other more economical voltmeters are shown here:

Voltmeter 8V- 16V, BEP 12V 1 In Stock Now. $110View
RV Electronics LCD 1 Water Tank Level Indicator and Voltmeter 13 In Stock Now. $93.95View

2) Battery Type

As can be seen in Figure 1 the battery type e.g. Wet Cell, Gel or AGM can give different voltage readings for percentage of charge left. While the volts is indicative of how much power is left, it is not like a fuel gauge. Petrol left in a fuel tank would show up as a straight line from 13 to zero in the chart above.

The AGM Deep Cycle battery plots closer to straight than the Wet Cell battery. They accept charge easier and faster than wet cell batteries. They are able to recover better from a lower discharge. Yes, they cost more than Wet Cell batteries, but with correct usage can last twice as long.

Camec Deep Cycle 100ah AGM Sealed Lead Acid Battery 1 In Stock Now. $330View
Sphere 12V 100ah AGM Deep Cycle Battery $335View
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Not everyone will benefit from using deep cycle batteries. If your predicted usage is much lower than would be supplied by these larger AGM Deep Cycle batteries, it can be a cheaper option to use a Wet Cell battery. If you leave 240V for only one or two days at a time, and you use only LED lights and say a water pump, you should manage quite well with a cheaper Wet Cell battery.

Caravans Plus does not sell Wet Cell batteries as these are harder to ship and are readily available in most locations. Wet Cell batteries need to be upright and located in a ventilated area that is not in the living area. AGM batteries are completely sealed and can be used at any angle. They can be placed under your bed without risk.

3) Excessive Draw Rate

Battery capacity decreases as the rate of discharge increases. Batteries (say 100ah battery) have been tested at a given discharge rate of 20 hours.

That means a constant use of 5 amps an hour for 20 hours (5 x 20 =100). The specifications should indicate this.

The bad news is that if you exceed that discharge rate quoted you will see a significant drop in capacity. If you need more than 5 amps per hour you should consider having two or even more batteries.

The good news is if you use less than the 5 amps per hour, you can get more than the quoted 100ah.

CaravansPlus: Calculating How Big Your Battery Needs To Be (17)

Figure 2: Battery capacity decreases as the rate of discharge increases.

4) Getting Less Than A Full Charge

When charging your batteries from a good battery charger over a number of days, you can get to 100% charge. However a vehicle alternator will only manage to get to around 70%. Also if you are charging your battery from your solar panels, you need to ensure your solar regulator is up to the job.

Voltage drop is one of the biggest problems in getting the battery in your Caravan or Camper trailer fully charged from your vehicle alternator. You can never charge the battery more than the voltage that reaches it through the copper cables. The longer the cable, the more the voltage drops. This can be compensated to some extent by increasing the cable x-section but even this has limits.

With your trusty voltmeter you can check what voltage your alternator is producing by starting your vehicle and connecting your voltmeter to the battery terminals. Ensure electrical accessories are NOT switched on. This should read from 13.8V to 14.8V.

CaravansPlus: Calculating How Big Your Battery Needs To Be (18)

Figure 3: Less charge due to voltage drop

Next test your voltage at the rear of the vehicle with the engine still running. This may be at an Anderson plug or the auxiliary wire in the trailer connector. Record this voltage and note any voltage drop. My vehicle has heavy duty cables and only dropped 0.1 of a volt.

Next take a reading where the auxiliary cable goes to the RV battery (or battery charger). My caravan has lighter wiring and the voltage loss was another 0.4 volts. The total voltage drop was 0.5 volts. When you look back at Figure 1, you will see that a reduction 0.5 volts pushing a charge into your RV battery can severely reduce the total usable amps until you top it up again.

There are two solutions to this problem. First you can increase the size of your copper wires so that the voltage drop is less. Second you can add a voltage booster that will step up the voltage to compensate for the loss. This must be placed between the alternator or vehicle battery and your RV battery so that current coming in will reach the battery at a higher voltage and thus increase the speed of charging and get more amp hours into that battery.

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GSL 12V to 12v, Voltage Booster Battery Charger 22A 2 In Stock Now. $554.24$222View
BMPRO MiniBoost DC to DC Charger (Voltage Booster) 4 In Stock Now. $375View

CaravansPlus: Calculating How Big Your Battery Needs To Be (22)

Figure 4: Increase amp hours stored with a booster

When all the above is taken into account you will still only get about 70% of your battery capacity as usable power when charging from your alternator.

When combined with manufacturers recommendations to get the most life out of your battery by discharging regularly to around 50%, then as a rule of thumb you will need twice the amps hours that you will calculate next. This rule of thumb allows for greater discharge on occasions, e.g. lower solar input or longer stays than normal or greater usage of 12V appliances. If you don't want this buffer then 70% usage will be the maximum you can use and any excess will greatly reduce your battery life and not operate all types of devices.

Calculating Your Amp Hours

Examine the following chart to calculate the number and size of batteries you will need. You can download a blank calculation form and enter your battery size to determine how long it will last.

CaravansPlus: Calculating How Big Your Battery Needs To Be (23)

Notes explained:

1) The water pump has a rating of 5.2amps, I estimate it runs for about 12 full minutes per day. 12 mins is 1/5 or 0.2 of an hour.

Three fridge options are provided, select one.
2) The gas fridge has a 12V fan that comes on when needed, estimated 6 hours per day, selected here.
3) The upright compressor fridge has a quantity of 0 (zero) so it is not used in this calculation. It uses too much power.
4) The chest fridge would be a suitable fridge for a camper trailer but unselected for these calculations.
5 & 6) Would be optional when power gets low.
7) We do not use a TV when camping, but some people may. They do use more than you think.
8, 9 &10) Are all LEDs and are very power conservative. The specifications for the LEDs were provided in watts so they are divided by 12V to gets the amps/h.

21) Just having an inverter switched ON uses power. Switch off when not required.
22 to 25) All essential 240V appliances for some softies. The watts need to be divided by 240V to get the amps/h needed for our calculations.

When the amps/h for all devices are added up we find we use around 13.5 amp hours per day.

Anything in the amps column that exceeds 5 amps will cause your battery to deteriorate very quickly, so I've elected to go for two batteries.

This gives me ample capacity. It is only the inverter extravagances that have taken me over the limit, so for many people a single AGM 100 to 120ah battery will be enough unless you have an upright 12V fridge, or need your TV when away from power.

You can download an Excel sheet or OpenOffice Spread Sheet to fill in your values.

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See also a related article: "Everything you need to know about installing solar panels."

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FAQs

How do I calculate how much battery I need? ›

Battery capacity formula

E = V × Q , where: E – Energy stored in a battery, expressed in watt-hours; V – Voltage of the battery; and.

How long will a 100Ah battery run an appliance that requires 60w? ›

Here are just a few examples of how long will such a 100Ah battery run different appliances: 100Ah battery will run a 1,200W appliance for 1 hour. 100Ah battery will run a 600W appliance for 2 hours.

How long will a 100Ah battery run an appliance that requires 600W? ›

How long will a 100Ah battery run an appliance that requires 600w? A 100Ah battery will run a 600W DC appliance for 1 hour. An AC appliance rated at 600W will only run for 0.86 hours because of the losses in the DC/AC inverter needed for the battery.

How long will 100Ah battery last calculator? ›

Therefore a 100ah (amp hour) battery will last for 1000 hours.

How long will a 200Ah battery run an appliance that requires 400W? ›

A 200Ah lead-acid deep-cycle battery with 50% Depth of Discharge will run a 400W AC appliance for about 3 hours.

How long will a 80ah battery last? ›

Battery Discharge Rate

An 80ah battery with a complete discharge can generate 80 amps of power for one hour when discharged at 1C. To acquire more amps from the same battery capacity, choose a greater discharge rate, such as 2C discharge, which will give 160 amps of current but only for thirty minutes.

How long will a 100Ah battery run a fridge? ›

A 100Ah lead-acid deep-cycle battery will run a fridge using 630kWh/year for 13.3 hours. 80% discharge is assumed, but at the recommended DoD of 50% the same 100Ah battery will run the fridge for 8.3 hours. A lithium iron phosphate 100Ah battery will run the fridge for 15.8 hours at 95% discharge.

How long will a 200w solar panel take to charge a 100Ah battery? ›

A 200-watt solar panel that produces 1 amp of current takes between 5 and 8 hours to fully charge a 12-volt car battery. A 100-watt solar panel will take double this amount of time to charge a battery — between 10 and 16 hours.

How long will a 100Ah lithium battery run a 12V fridge? ›

The average 12V fridge (1.6 to 2.5 Cubic feet) uses about 1.3 Ah of energy per hour. At this rate of energy usage, a 12V-100Ah battery can power a 12V fridge for about 3 days before the battery is completely discharged.

How long will a TV run on a 100Ah battery? ›

In general, a 12V-100Ah battery can run a 32-inch LED TV for 24 to 30 hours before it is completely depleted. The same 100ah battery would only run a 50 inch LED TV for 15 to 20 hours before it is fully discharged. However, please note that unless it's a lithium battery, it should not be fully discharged.

How long will a 100W solar panel take to charge a 100Ah battery? ›

A 100W solar panel with an MPPT solar charger will take about 20 hours to fully recharge an 80% discharged 100Ah lithium iron phosphate battery. 250 watts of solar panels is recommended to fully recharge a 100Ah LiFeP04 battery in a day, if it is to be used for home energy storage.

How many solar panels do I need for a 100Ah battery? ›

You need a 3-6 watt solar panel to maintain a 100Ah lead acid battery.

How long will a 100Ah battery run an appliance that requires 100w? ›

For example, assuming the appliance runs continuously, a 12-volt 100ah lead-acid battery could run a 100w appliance for 4.5 to 5.5 hours at a 50% depth of discharge.

How long will a 110ah battery last? ›

How long will a battery last? This depends how many amps you draw. All leisure batteries produce 12v. Using the 12v Car Kettle from before: Amp-hours: 110 amp-hours Amps: 10 volts 110/12 = 11 hours If a 110 amp-hour battery is running the 12v Car Kettle at 10 amps it will last for 11 hours.

How long will a 12v 200ah battery last? ›

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.

What size inverter do I need for 200Ah battery? ›

On the other hand, the Enerdrive B-TEC 200Ah & 300Ah battery has the ability to deliver a maximum discharge of 200A (up to a 2000W inverter). So, with this information at hand, a common 100Ah-150Ah lithium battery of this type can deliver enough energy to operate a maximum of a 1000w inverter.

How many solar panels do I need for a 200Ah battery? ›

As a general rule, a 200Ah lead-acid deep-cycle battery would need a 300 watt solar panel to fully recharge from 50% Depth of Discharge (DOD) assuming 4 peak-sun-hours per day. Charging would be complete in one day with a clear sky.

What size charger do I need for a 200Ah battery? ›

For Lithium and Lead Crystal batteries, the charger to battery ratio is based on 30% for maximum performance and lifespan. That means a 200Ah requires a 60Amp charger.

How long can a 75ah battery last? ›

12V 75Ah Battery, Sealed Lead Acid battery (AGM), 350x166x174 mm (LxWxH), Terminal I2 (Insert M6)
Manufacturer:battery-direct©
Lifespan (calendar):GENERAL PURPOSE, 6 to 9 years according to EUROBAT (standby-operation at 20°C)
Lifespan (cycle):Up to 450 cycles (load/unloading operations at 50% discharging depth)
18 more rows

How long will a 12 volt battery last with a 1000 watt inverter? ›

How long will a 12 volt battery last with a 1000 watt inverter? A 12 volt 100Ah deep-cycle battery with regular depth of discharge 50% would run a fully-loaded 1000 watt inverter for 34 minutes.

What size solar panel do I need to charge a 80Ah battery? ›

One 80Ah battery needs a 140-watt solar panel. One 175Ah battery needs a 100-watt solar panel. One 120Ah battery needs a 210-watt solar panel. One 200Ah battery needs a 300-watt solar panel.

What size inverter can I run off a 100Ah battery? ›

For example, a 100Ah lithium battery will power a 1000W inverter which is perfect for running laptops, televisions, blenders, power tools, and phone or camera chargers. A 1000W inverter is often the ideal size for most simple setups.

How many 12V batteries do I need for a 3000 watt inverter? ›

For a 3000-watt inverter, the number of batteries you need depends on their amperes per hour. For example, the average car battery has a 50Ah rating. If the battery banks you want to purchase are also 50Ah, you will need six of them for a 3000-watt inverter.

Is 100Ah enough for camping? ›

100 amp hours is a fairly typical battery size when it comes to the camping, travel and RV industries.

How long will a 30w solar panel take to charge a 100Ah battery? ›

In general, a 100Ah deep-cycle lead-acid battery would require 180 watts of solar panel to fully recharge from 50% Depth of Discharge (DOD) assuming 4.2 peak-sun-hours per day. It would take 8 hours to fully recharge with a clear sky.

How long will a 300W solar panel take to charge a 100Ah battery? ›

Since your 100Ah, 12V battery requires 1200 watt-hours to be fully charged, this means a single solar panel rated at 300W will be able to charge your battery in a five-hour timeframe.

How fast will a 300 watt solar panel charge a 12 volt battery? ›

A 100Ah 12 volt battery is equivalent to 1200 watt-hours, so a 300 watt solar panel using an MPPT solar controller will recharge a fully discharged 100Ah 12 volt battery in less than 5 hours.

Can you run a fridge off a car battery while driving? ›

Fridges should never run off the cranking battery that you use to start your vehicle. The only exception to this is while you are driving if you absolutely must. The reason behind this is simple – your cranking battery is imperative to start your vehicle, and if you run it flat you can be in serious trouble.

Will RV fridge run off battery while driving? ›

The short answer is: Yes! An RV fridge can be used while driving. Keep in mind there are safety concerns with running propane while driving.

How many batteries do I need for a 2000 watt inverter? ›

Helpful Expert Reply: Typically two batteries are needed for a 2,000 watt inverter like the part # 34278156 that you referenced.

How long will a 12 volt battery run a 1500 watt inverter? ›

A 1500 watt AC Power Inverter will run for approximately 16 hours based on the 200 amp hour rating of your 12 volt battery.

How long can a 150ah battery run a load of 300 watts? ›

It also depends on the usage of the battery and the appliance load on it. You can expect your 150 Ah battery to last for around 3 hours on 400 watts bulb load if it is fully charged. If the load or appliance wattage is reduced the backup will improve.

How many watts solar panel can charge 100Ah battery? ›

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.

Can a 200W solar panel charge a 100Ah battery? ›

How many batteries can a 200 watt solar panel charge? A 200W/12V solar panel that gets 5 peak sun hours a day can produce 1000Wh of energy every day. That's enough energy to charge a 100Ah/12V battery or two 50Ah/12V batteries wired in parallel.

How fast will a 200 watt solar panel charge a 12 volt battery? ›

Now you know that a 200-watt solar panel can take between 5 to 8 hours to charge a 12-volt battery.

Why is my solar battery draining so fast? ›

So there are various things to consider. But the overall thing to keep in mind is if a solar panel is draining a battery it's mainly because the diode of the panel is broken. Otherwise, the solar charge controller has faulty settings, the battery is damaged or there are problems with the wiring in the system.

Is a 20 amp controller enough for a 200 watt solar panel? ›

If you had two 200-watt solar panels and a 20V battery, you would see 20 Amps for your current. This is found by dividing the total Wattage (400) by the Voltage (20). That means that you would need a 20A charge controller.

How long does it take to fully charge a 100Ah battery? ›

For example, a 100Ah battery has a “C-Rate” of 100Amps. Thus to fully recharge a 12V 100Ah battery using a 12V/10A charger will take a nominal 10 hours if the battery is fully discharged.

What size solar panel do I need to charge 120Ah battery? ›

In general, a 120Ah deep-cycle lead-acid battery would require a 200 watt solar panel to recharge from 50% Depth of Discharge (DOD) if we assume 4 peak-sun-hours per day. It would take one day to fully recharge assuming clear skies.

How many hours does a 10000mah battery last? ›

10,000mAh /1,000mAh=10 hours.

How long will a 100Ah battery run an appliance that requires 100w? ›

For example, assuming the appliance runs continuously, a 12-volt 100ah lead-acid battery could run a 100w appliance for 4.5 to 5.5 hours at a 50% depth of discharge.

How many kWh battery do I need? ›

Regardless, if you already have a 5kW system, or are looking to purchase one, you'll likely need a battery with a capacity of at least 10kWh, more likely, up to 13.5 kWh. The exact battery size you need depends on how much electricity you typically consume during daylight hours and your purchase motives.

How many hours does a 5000mAh battery last? ›

Its 5000mAh battery keeps your phone going longer without constant recharging, powering 13 hours of video viewing, 27 hours of call time, and 40 hours standby.

Which is better 10000mah or 20000mAh? ›

You can get smaller portable batteries with 5,000mAh and 10,000mAh capacities, but those with 20,000mAh will last you longer and should charge your device several times.

How many times can 10000mah charge a phone? ›

Number of times you can charge your device
iPhoneAndroid smartphone
5000mAh1 timeJust under 1 time
10,000mAh2 to 3 times1 to 2 times
20,000mAh4 to 6 times2 to 4 times
27,000mAh6 to 8 times3 to 5 times
23 Aug 2022

How many mAh is a good power bank? ›

For regular phone use or a daily commute, take a look at power banks between 3,000-5,000 mAh, which are portable and have adequate juice. For phone users with unique needs or for particular scenarios, 7,000-10,000 mAh are good options.

How long will a 100Ah battery run a fridge? ›

A 100Ah lead-acid deep-cycle battery will run a fridge using 630kWh/year for 13.3 hours. 80% discharge is assumed, but at the recommended DoD of 50% the same 100Ah battery will run the fridge for 8.3 hours. A lithium iron phosphate 100Ah battery will run the fridge for 15.8 hours at 95% discharge.

How long will a 200w solar panel take to charge a 100Ah battery? ›

A 200-watt solar panel that produces 1 amp of current takes between 5 and 8 hours to fully charge a 12-volt car battery. A 100-watt solar panel will take double this amount of time to charge a battery — between 10 and 16 hours.

How long will a TV run on a 100Ah battery? ›

In general, a 12V-100Ah battery can run a 32-inch LED TV for 24 to 30 hours before it is completely depleted. The same 100ah battery would only run a 50 inch LED TV for 15 to 20 hours before it is fully discharged. However, please note that unless it's a lithium battery, it should not be fully discharged.

How long will a 5kwh battery last? ›

If you generally want to run a few lights, fridge and a TV, a battery with 5kW capacity should last about 10 hours. If you add the use of heavy duty energy guzzlers for example air conditioners or a pool pump, it is going to drain the solar battery very quickly.

How do I calculate kWh? ›

Here's the Formula for Calculating Watts Into Kilowatt-Hours: kWh = (watts × hrs) ÷ 1,000.

How long will a 10 kWh battery last? ›

In case of power outages, the 10kwh Battery Pack can power your home for about 8 hours on average 1kWh / hr for 8 hrs Combine the 10kWh Battery Pack with solar or use independently to provide your home with power both day & night.

How long will a 7000 mAh battery last? ›

Industry's First 7,000mAh Monster Battery

The phone can handle heavy day-to-day use without breaking a sweat, thanks to the mammoth 7,000mAh battery cell. The segment-first 7,000mAh battery cell can easily deliver 32 hours of video playback time and up to 150 hours of music playtime on one full charge cycle.

How long can a 3500mah battery last? ›

From a strictly numerical perspective, if you're using 3500mA, it will last for 1 hour, or if you're using only 1mA, it will last for 3500 hours. Most people care about batteries in cell phones, so it might help to compare this to cell phones.

Which phone is best for battery life? ›

Best phone battery life at a glance (hours:minutes)
  • Asus ROG Phone 6 Pro: 15:30.
  • iPhone 14 Pro Max: 13:39.
  • Nubia RedMagic 6: 13:20.
  • Moto G Power (2022): 13:15.
  • Asus Zenfone 9: 13:13 (tie)
  • Nubia RedMagic 6S Pro: 13:13 (tie)
  • Moto G Stylus (2022): 12:30.
  • iPhone 13 Pro Max: 12:16 (tie)
16 Sept 2022

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