ABCDEFGHIJKLMNOPQRSTUVWXY
1
Camper Van Battery Size Calculator (For 12V Systems)
2
Device NamePower (W)Device QuantityHours Used Per DayWatt Hours (Wh) per dayAmp Hours (Ah) per dayInstructionsColor Code
3
LED Lights3128.530625.5Cells shaded in GREEN are for you to fill in. DO NOT edit the code in the YELLOW cells.

1. Device Name: Enter Each Device In Your Camper Van.
We already filled some devices as an example. You can add more or delete as you need.

2. Power (W): Enter Operating Wattage Of Each Device.
The wattage can be found on the product's box, manual, or online page. The pre-filled numbers are an example, you can change the wattage number based on your products.

3. Device Quantity: Enter Quantity Of Each Device In Your Van.
For example, if you have 12 LED lights, enter 12. If you have two smartphones, enter 2.

4. Hours Used Per Day
For example, if you use LED lights for 8.5 hours per day, enter the number 8.5. If you only use the hair dryer for 6 minutes per day, enter the formula: =6/60

5. Go To Part 2
Once you have sized your battery bank, remember to go to part 2 (next tab) to build your solar system.		You Fill In
4
Vent Fan3120605Auto Generated
5
12V Fridge (see note)551633027.5
6
Smartphone1222484
7
Laptops652226021.7
8
Water Pump5710.528.52.4
9
Diesel Heater2013605.0
10
Inverter Only1515.2578.756.6
11
Blender24010.0500012.001.00
12
Instant Pot75010.1667125.0010.42
13
Hair Dryer80010.180.006.67
14
0.000.00
15
0.000.00
16
0.000.00
17
0.000.00
18
0.000.00
19
Daily Energy Usage:116Ah
20
Recommended MINIMUM Battery Size:AGM Battery:463Ah
21
Lithium Battery:231AhFor A Step-Step Tutorial:Click Here
22
23
Next Step:Take the recommended minimum battery size from cell F20 or F21 and round up to the next 100Ah. You will need to choose which battery chemistry to use (AGM or lithium). We STRONGLY recommend going with lithium.

See battery recommendation below.
24
25
Recommended Batteries
26
We almost never recommend AGM batteries anymore due to their low # of charge cycles and short lifespan. These days budget, no-frills lithium batteries are similar in price to AGMs and perform significantly better, making AGMs virtually non-competative for van life.
27
Best Budget Lithium:LiTime TM 100Ah Lithium BatteryView On Amazon
28
Best Premium Lithium:Battleborn 270Ah Lithium BatteryView On Amazon
29
30
Next Step:Now that you know your battery bank size, you can size your solar array. Download our solar calculator to help you get started.
31
To download the solar array wattage calculator:Click Here
32
33
Have You Downloaded Our FREE Wiring Diagrams?
34
30+ pages of helpful wiring schematics
35
36
12V system, solar, inverter, & DC-DC charging
37
38
100% free, no email signup
39
40
41
Download Now
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100