Battery Equivalents and Replacements

How Many Batteries Is Needed For 3000 Watt Power Inverter

3000-watt power inverters are a very popular class of power inverters used during blackouts, emergencies, camping, for off-the-grid, medical and security systems, and similar.

Most 3000-watt power inverters are very simple to use, however, dimensioning required batteries or battery packs can cause some issues in terms of reliability and runtime.

Published: January 24, 2022.

3000 watt inverter 1

3000 Watt Power Inverters Energy and Power Requirements

Power inverters are not ideal units and have a certain energy loss during energy conversion.

Good power inverters feature an energy efficiency of ~85%, although there are units with better energy efficiency - such units are usually more expensive ones.

Thus, if the power inverter features a continuous output power of 3000 Watts, the required battery power is:

PBat = PInv / Energy Efficiency % = 3000 Watt / 0.85 = 3530 Watts

Also, power inverters usually feature a surge output power that is ~2x larger than the continuous output power, thus requiring the battery to provide much more power for a very short time (usually just a few seconds):

PBat = PInt / Energy Efficiency % = 6000 Watt / 0.85 = 7060 Watts

Thus, if we want to power 3000 Watt power inverter that features energy efficiency of 85%, the battery (or battery pack) must be able to provide ~3600 watts continuously and ~7200 surge watts.

This solves power requirements. But, what about energy requirements?

3000 watt inverter 2

Power inverters usually don't operate at full power all the time - if that is happening, then the power inverter is seriously underpowered.

Energy requirements are usually given in the form of continuous power during a certain time, for example, 1000W for 3 hours.

In that case, the energy that the battery must provide is calculated using these formulas:

PBat = 1000 W / 0.85 = ~1200 Watt

EBat = PBat * T (h) = 1200 Watt * 3 hours = 3600 Wh = 3.6 kWh

In this example, if we want to power a 3000 Watt power inverter with surge power of 6000 Watt and energy efficiency of 85%, we need a battery that is able to provide 3600 Watts continuously, 7200 surge Watts and that features an energy capacity of at least 3.6 kWh.

3000 Watt power inverters are usually 12V units, but there are also 3000 Watt power inverters that accept 24V, 36V, or even 48V.

Battery currents can be easily calculated:

IBatCont = P(W) / U(V) = 3600W / 12V = 300 Amps

IBatSurge = P(W) / U(V) = 7200W / 12V = 600 Amps

IBatAverage = P(W) / U(V) = 1200W / 12V = 100 Amps

Note: as one can see, when powering 3000W inverters using 12V batteries, currents are rather strong!

Battery actual capacity can be calculated using following formula:

Actual Capacity = Required Energy (Wh) / U(V) = 3600 Wh / 12V = 300 Ah

Actual Capacity vs. Nominal Capacity: nominal capacity of the battery is battery capacity measured when the battery is discharged for 20h. However, when the battery is discharged faster, especially lead-acid batteries, actual capacity decreases - 1h actual capacity can be as little as 50-70% of nominal (20h) capacity for lead-acid batteries.

Lithium deep discharge batteries are less sensitive to discharge current in terms of capacity loss, but if a certain current is reached, the built-in Battery Management System (BMS) disconnects the lithium battery to protect it from overcurrent discharge.

Personally, for most applications lithium batteries are a much better choice than lead-acid batteries - for more about these batteries, feel free to check out our Best 12V, 24V, 36V, and 48V Lithium Deep Cycle Battery For a Power Inverter article.

ampere time 12v 300ah lithium

For example, Ampere Time 12V 300Ah battery is one of the best batteries in its class and supports:

- maximum continuous current of 200 Amps,

- maximum surge current of 400 Amps for 5 seconds,

- connections of four batteries in series and four batteries in parallel in order to create larger battery packs.

In order to power 3000W power inverter in our example, we would need at least two such batteries connected in parallel - such battery pack would support:

- maximum continuous current of 400 Amps, which is more than the required 300 Amps,

- maximum surge current of 800 Amps for 5 seconds, which is more than the required 600 Amps,

- actual capacity is 600 Ah, which is more than the required 300 Ah.

If such battery pack is too large, note that Ampere Time 12V 200Ah battery features the same current limits, but provides an actual capacity of 400 Ah when two batteries are connected in parallel - still more than enough for our example.

Of course, there are other 12V lithium batteries that can be used to power 3000W and similar power inverters:

Model Battery Type
Chemistry
Group Size
Capacity (Ah)
Discharge Currents Parallel / Series Connections Weight (lbs/kg)
Aicipow PDAC-12100 Deep Cycle
LiFePO4
31
100
100A cont. P: up to 4
S: up to 4
26 lbs; 11.8 kg
Aicipow PDAC-12200 Deep Cycle
LiFePO4
4D (6D)
200
100A cont. P: up to 4
S: up to 4
58 lbs; 26.3 kg
AIMS Power LFP12V50A Deep Cycle
LiFePO4
-
50
50A cont.
100A 10s
? 17.75 lbs; 8.04 kg
AIMS Power LFP12V100A Deep Cycle
LiFePO4
31
100
100A cont.
200A 10s
? 30.2 lbs; 13.7 kg
AIMS Power LFP12V200A Deep Cycle
LiFePO4
4D (6D)
200
160A cont.
350A 10s
? 77 lbs; 34.9 kg
AIMS Power LFP12V50B Deep Cycle
LiFePO4
-
50
50A cont.
100A 10s
P: up to 4
S: up to 4
15.5 lbs; 7.0 kg
AIMS Power LFP12V100B Deep Cycle
LiFePO4
31
100
100A cont.
200A 10s
P: up to 4
S: up to 4
28.5 lbs; 12.9 kg
AIMS Power LFP12V200B Deep Cycle
LiFePO4
4D (6D)
200
200A cont.
400A 10s
P: up to 4
S: up to 4
62 lbs; 28.1 kg
Ampere 12V 50Ah Plus Deep Cycle
LiFePO4
-
50
50A cont.
100A 5s
P: up to 4
S: up to 4
14.3 lbs; 6.5 kg
Ampere 12V 100Ah Deep Cycle
LiFePO4
31
100
100A cont.
280A 5s
P: up to 4
S: up to 4
24.25 lbs; 11 kg
Ampere 12V 200Ah Plus Deep Cycle
LiFePO4
4D (6D)
200
200A cont.
400A 5s
P: up to 4
S: up to 4
52.3 lbs; 23.7 kg
Ampere 12V 300Ah Plus Deep Cycle
LiFePO4
4D (8D)
300
200A cont.
400A 5s
P: up to 4
S: up to 4
63 lbs; 28.54 kg
Ampere 12V 400Ah Plus Deep Cycle
LiFePO4
8D
400
250A  cont.
750A 5s
P: up to 4
S: up to 4
86.2 lbs; 39.1 kg
Banshee LFP-31M Dual Purpose
LiFePO4
31
100
1200 CCA P: ?
S: up to 4
24.2 lbs; 11 kg
Battle Born BB5012 Deep Cycle
LiFePO4
-
50
60A cont.
100A 30s
P: yes
S: up to 4
17.6 lbs; ~8.0 kg
Battle Born BB10012 Deep Cycle
LiFePO4
31
100
100A cont.
200A 30s
P: yes
S: up to 4
29 lbs; 13.2 kg
Battle Born BBGC2 Deep Cycle
LiFePO4
GC2
100
100A cont.
200A 30s
P: yes
S: up to 4
31 lbs; 14 kg
Bioenno Power BLF-12100WS Deep Cycle
LiFePO4
31
100
100A cont.
200A 5s
(not recommended) 28.1 lbs; 12.8 kg
Chins 12V50Ah Deep Cycle
LiFePO4
-
50
50A cont.
150A 5s
P: up to 4
S: up to 4
13.8 lbs; 6.3 kg
Chins 12V100Ah Deep Cycle
LiFePO4
31
100
100A cont.
300A 5s.
P: up to 4
S: up to 4
23.9 lbs; 10.8 kg
Chins 12V200Ah Deep Cycle
LiFePO4
4D (6D)
200
200A cont.
600A 5s
P: up to 4
S: up to 4
49.4 lbs; 22.4 kg
Chins 12V300Ah Deep Cycle
LiFePO4
4D (6D)
300
200A cont.
600A 5s
P: up to 4
S: up to 4
67.3 lbs; 30.5 kg
Chins 12V400Ah Deep Cycle
LiFePO4
4D (6D)
400
250A cont.
750A 5s
P: up to 4
S: up to 4
86.4 lbs; 39.2 kg
Eastup 1250750 Dual Purpose
LiFePO4
34R/97R
50
750 CCA
930 MCA
? 15.43 lbs; ~7.0 kg
Eastup 12751000 Dual Purpose
LiFePO4
94R
75
1000 CCA ? 18.5 lbs; 8.4 kg
Eco-Worthy 12V50Ah Deep Cycle
LiFePO4
-
50
60A cont. P: unlimited
S: up to 4 
11.9 lbs; 5.4 kg
Eco-Worthy 12V100Ah Deep Cycle
LiFePO4
34
100
- P: up to 4
S: up to 4
23 lbs; 10.4 kg
Eco-Worthy 12V150Ah Deep Cycle
LiFePO4 
31
150
150A cont. P: unlimited
S: up to 4 
36.7 lbs; 16.6 kg
Eco-Worthy 12V200Ah Deep Cycle
LiFePO4
-
200
120A cont. P: unlimited
S: up to 4
52.9 lbs; 24 kg
ExpertPower EP1250 Deep Cycle
LiFePO4
-
50
50A cont.
100A 10s
? 13 lbs; 5.9 kg
ExpertPower EP12100 Deep Cycle
LiFePO4
31
100
100A cont.
200A 2s
? 22.6 lbs; 10.3 kg
ExpertPower EP12200 Deep Cycle
LiFePO4
4D (6D)
200
150A cont.
200A 3s
? 48.3 lbs; 21.9 kg
GLI GLIBATT12050 Deep Cycle
LiFePO4
26
50
50A cont.
500A 5s(?)
P: yes
S: up to 4
12 pounds; 5.5 kg
GreenLiFE GL50-50AH Deep Cycle
LiFePO4
21
50
50A cont. Yes 15 lbs; 6.8 kg
GreenLiFE GL80-80AH Deep Cycle
LiFePO4
27
80
80A cont. Yes 28 lbs; 12.8 kg
GreenLiFE GL100-100AH Deep Cycle
LiFePO4
31
100
100A cont.
1000A 5s
Yes 31 lbs; 14 kg
GreenLiFE GL260-260AH Deep Cycle
LiFePO4
8D
260
100A cont.
2600A 5A
Yes 80 lbs; 36.24 kg
JITA 12V100Ah Deep Cycle
LiFePO4
31
100
100A cont. P: up to 4
S: up to 4
23.8 lbs; 10.8 kg
JITA 12V200Ah Deep Cycle
LiFePO4
4D (6D)
200
200A cont. P: up to 4
S: up to 4
48.9 lbs; 22.2 kg
JITA 12V300Ah Deep Cycle
LiFePO4
4D (6D)
300
200A cont. P: up to 4
S: up to 4
59.5 lbs; 27 kg
JITA 12V400Ah Deep Cycle
LiFePO4
4D(6D)
400
200A cont.
400A 5s
P: up to 4
S: up to 4
83.7 lbs; 37.9 kg
Kunmo LF-12100 Deep Cycle
LiFePO4
75
100
100A cont. ? 25.3 lbs; 11.5 kg
Lossigy 12V100Ah Deep Cycle
LiFePO4
-
100
50A cont. P: up to 10
S: up to 4
23.8 lbs; 10.8 kg
Lossigy 12V200Ah Deep Cycle
LiFePO4
4D
200
100A cont. P: no limit (10?)
S: up to 4
46 lbs; 20.9 kg
Lossigy 12V300Ah Deep Cycle
LiFePO4
4D (6D)
300
200A cont. P: up to 10
S: up to 4
72 lbs; 32.6 kg
Lossigy 12V400Ah Deep Cycle
LiFePO4
4D (6D)
400
200A cont. P: up to 10
S: up to 4
95 lbs; 43 kg
Mighty Max ML100-12LI Deep Cycle
LiFePO4
30H
100
100A cont.
200A 15s
P: up to 4
S: not allowed
29.54 lbs; 13.4 kg
Mighty Max ML4D-LI Deep Cycle
LiFePO4
4D (6D)
200
- P: up to 4
S: not allowed
48 lbs; 21.8 kg
PacPow 12V 100Ah Deep Cycle
LiFePO4
31
100
100A cont.
300A 10s
P: up to 4
S: up to 4
27.56 lbs; 12.5 kg
Pionergy 12V200Ah Deep Cycle
LiFePO4
4D (6D)
200
200A cont. P: up to 4
S: up to 4
46.1 lbs; 20.9 kg
Pionergy 12V300Ah Deep Cycle
LiFePO4 
4D (6D)
300
200A cont. P: up to 2
S: up to 4
71.2 lbs; 32.3 kg
Power Queen 12V100Ah Deep Cycle
LiFePO4
31
100
100A cont. P: up to 4
S: up to 4
25.25 lbs; 11.0 kg
Power Queen 12V200Ah Deep Cycle
LiFePO4
4D (6D)
200
100A cont. P: up to 4
S: up to 4
48.28 lbs; 21.9 kg
Power Queen 12V300Ah Deep Cycle
LiFePO4
4D (6D)
300
200A cont. P: up to 4
S: up to 4
62.8 lbs; 28.5 kg
Renogy RNG-BATT-LFP-12-50 Deep Cycle
LiFePO4
-
50
50A cont. P: yes
S: not allowed
14.77 lbs; 6.7 kg
Renogy RBT100LFP12S-G1 Deep Cycle
LiFePO4
-
100
100A cont. P: yes
S: not allowed
26 lbs; 11.8 kg
Renogy RNG-BATT-LFP-12-170 Deep Cycle
LiFePO4
-
170
125A cont. ? 46.3 lbs; 20.97 kg
Scream Power 12V100Ah Deep Cycle
LiFePO4
31
100
? P: ?
S: no
24.3 lbs; 11 kg
Scream Power 12V400Ah Deep Cycle
LiFePO4
-
400
400A cont.
800A peak
? 81.4 lbs; 36.9 kg
Vatrer 12C 100Ah Deep Cycle
LiFePO4
31
100
100A cont. P: up to 4
S: up to 4
33 lbs; 15 kg
Vatrer 12V 200Ah Deep Cycle
LiFePO4
4D
200
100A cont. P: up to 4
S: up to 4
48.5 lbs; 22 kg
VMAXTANKS LF27-12100 Deep Cycle
LiFePO4
27
100
125A cont.
350A 3s
P: up to 4
S: up to 4
25.3 lbs; 11.5 kg
VMAXTANKS LFPU1-1245 Deep Cycle
LiFePO4
U1
45
45A cont.
100A 3s
P: up to 4
S: up to 4
10.8 lbs; 4.9 kg
VMAXTANKS VPG12C-50Li Deep Cycle
LiFePO4
U1
50
50A cont.
100A 5s
150A 3s
P: up to 2
S: not allowed
12 lbs; 5.5 kg
Waterblade LFP 100-12.8 Deep Cycle
LiFePO4
-
100
80A cont.
400A 1s
? 29 lbs; 13.2 kg
Weize FPLI-12100AH Deep Cycle
LiFePO4
31
100
50A cont.
100A 3s
P: up to 4
S: up to 4
26.4 lbs; 12.0 kg
Weize TPLI-12200AH Deep Cycle
LiFePO4
4D (6D)
200
100A cont.
200A 3s
P: up to 4
S: up to 4
27.6(?) lbs; 12.5(?) kg
Wingda W100-12V100AH Deep Cycle
LiFePO4
31
100
50A cont. P: up to 4
S: up to 4
23.8 lbs; 10.8 kg
Wingda W200-12V200AH Deep Cycle
LiFePO4
4D (6D)
200
100A cont. P: up to 4
S: up to 4
48.9 lbs; 22.15 kg
Wingda W300-12V300AH Deep Cycle
LiFePO4
8D
300
200A cont. P: up to 4
S: up to 4
70.54 lbs; 31.95 kg
Zooms 12V 100Ah Deep Cycle
LiFePO4
31
100
100A cont. P: up to 4
S: up to 4
25.35 lbs; 11.5 kg
Zooms 12V 200Ah Deep Cycle
LiFePO4
4D (6D)
200
200A cont. P: up to 4
S: up to 4
49.6 lbs; 22.5 kg
Zooms 12V 300Ah Deep Cycle
LiFePO4
4D (6D)
300
200A cont. P: up to 4
S: up to 4
62.83 lbs; 28.5 kg

3000 watt inverter mWhen calculating the number of required batteries in order to power 3000 Watt power inverter, it is a good practice to over-dimension the battery pack - in most situations, energy requirements can only grow...

And whatever You do, stay safe - these units are easy to use and maintain, but they are not toys and can provide huge currents that can do some serious damage, injuries, or worse...

 

Amazon Search:

- Lithium 300Ah LiFePO4 Battery

- Lithium 400Ah LiFePO4 Battery

Note: Amazon links open in the new windows, feel free to check them for the most up-to-date offers and prices.