Solar & Battery Electrical Calculator for Campervans | VanPowerCalc

Q: Is the Elefast 330Ah really 330Ah?

Mine tested at 312Ah (94.5% of rated) — honest and competitive with premium brands. Budget batteries vary more between units though. If you get one that tests below 90%, contact the seller.

Q: How does Elefast compare to SOK or BattleBorn?

Elefast: $450-550 for 330Ah ($1.50/Ah), heavier steel case, Xiaoxiang BMS, built-in heater. SOK: $400-500 for 206Ah ($2.20/Ah), aluminum case, better app, established reputation. BattleBorn: $700+ for 100Ah ($7/Ah), premium support but expensive. Elefast wins on $/Ah by a wide margin.

Q: Does the built-in heater work well?

Yes — it activates at 0°C and warms cells to 5°C before allowing charge. Takes 15-20 minutes in mild cold (-5°C) and 30-40 minutes at -15°C. Draws about 60W during heating. A genuine convenience feature for winter van life.

Q: What's the warranty on Elefast batteries?

5-year warranty through the seller (typically Amazon or direct). The BMS is rated for 4,000 cycles at 80% DoD. At one cycle/day, that's 10+ years — the warranty period is the real limiting factor.

Q: Can I parallel two Elefast 330Ah batteries?

The Xiaoxiang BMS supports parallel operation. Use equal-length 35mm² interconnect cables and charge both to the same voltage before connecting. Two in parallel = 660Ah / 8.4kWh — a massive bank for van life.

Leo

Fact-checked on Apr 7, 2026

Elefast 330Ah LiFePO4: Does It Deliver on the Specs?

I tested the Elefast 330Ah to see if it's really 330Ah. Real capacity, BMS behavior, and whether it's worth the price.

4 min read

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VANPOWERCALC.COMYOUR ENERGY PROFILE

YOUR ENERGY PROFILE.

This document contains the sizing of your future electrical installation, calculated based on your appliances.

Minimum Daily Consumption

0 WH / DAY

Inventory:

SYSTEM SIZINGPage 2

Battery

To guarantee 0WH without damaging your bank (80% max discharge):

0 AH

LiFePO4 12V

Solar

Minimum power required to recharge your consumption:

0 W

via MPPT

220V AC

Maximum power (with 25% safety margin).

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No Need

Safety & CablingPage 3

12V Cable Sizing Guide

Use this professional reference table to select the correct gauge (mm²) for your cables. For 12V in a van, the maximum tolerated voltage drop is 3%. Always use multi-stranded flexible automotive wire.

Current (A)	Round trip < 2m	Round trip 4m	Round trip 6m
5A (LEDs, USB)	1.5 mm²	2.5 mm²	4 mm²
10A (Fridge, Pump)	2.5 mm²	4 mm²	6 mm²
20A (Heater)	4 mm²	10 mm²	10 mm²
50A (DC/DC Booster)	10 mm²	16 mm²	25 mm²
100A (Inverter)	25 mm²	35 mm²	50 mm²

Fuse Sizing

The fuse protects the wire, not the appliance. Always place it as close to the power source as possible (battery or busbar).

Wire 1.5 mm² → Max fuse 10A
Wire 2.5 mm² → Max fuse 20A
Wire 4 mm² → Max fuse 30A
Wire 6 mm² → Max fuse 40A
Wire 10 mm² → Max fuse 60A

SCHÉMA ÉLECTRIQUE

PANNEAUX SOLAIRES

0W

RÉGULATEUR MPPT

BATTERIE AUXILIAIRE

0 Ah

Lithium LiFePO4

FUSIBLE

BOÎTE À FUSIBLES 12V

Pompe, Leds, Frigo...

CONVERTISSEUR 220V

NON REQUI

PRO GEARPage 4

SHOPPING LIST

Where to find this equipment? Here is the community-approved selection.

12V 6-way Fuse Box

Mandatory protection

Digital Multimeter

Test your connections

Heavy Duty Crimping Tool

For perfect lugs

Heat Shrink Tubing

Insulation and safety

GENERATED BY VANPOWERCALC.COM

Budget LiFePO4 batteries are a gamble — some deliver honest capacity, others barely hit 80% of their rated specs. I tested the Elefast 330Ah over 3 months in my Sprinter to find out where it falls.

The capacity test: I drained it from 100% to BMS cutoff (10.5V) at a steady 20A draw using a resistive load bank. Result: 312Ah delivered — 94.5% of rated capacity. That's excellent for a budget battery. By comparison, the SOK 206Ah I tested previously delivered 198Ah (96%) and a cheap Amazon 200Ah only managed 162Ah (81%).

Lithium vs lead-acid AGM Gel battery comparison for campervan

Expert tip

Cycle the battery 3-4 times between 20% and 100% when you first get it — the BMS cell balancing needs a few full cycles to equalize all four cell groups. My initial capacity test showed 295Ah, but after 4 cycles it settled at 312Ah as the cells balanced.

Example calculation for your setup

Results based on a typical use case

Appliance	Power	Usage/day	Wh/day
Compression fridge	45W	24h	1080
LED lighting	20W	4h	80
Water pump	30W	0.5h	15
Phone charging	15W	2h	30
Daily consumption			1205 Wh

Recommended LiFePO4 battery

151 Ah

(80% depth of discharge)

Recommended AGM battery

241 Ah

(50% depth of discharge)

Adjust these values with the calculator below

Read our complete battery guide

Comparison table

Spec	Elefast 330Ah	SOK 300Ah	LiTime 300Ah
Rated Capacity	330Ah	300Ah	300Ah
Measured Capacity	~315Ah	~295Ah	~290Ah
BMS Rating	200A cont / 250A peak	200A continuous	200A continuous
Weight	38 kg	29 kg	28.5 kg
Case Material	Steel	Aluminum	Steel
Bluetooth	Yes (Xiaoxiang app)	Yes (SOK app)	Yes (LiTime app)
Self-Heating	Yes (built-in)	No	Optional model
Dimensions (mm)	520x240x218	520x240x218	520x269x220
Warranty	5 years	11 years	5 years
Price (2026)	~$750	~$900	~$680
Best For	Cold climate builds	Premium, lightweight	Best value large capacity

About this tool

Build quality is decent but not premium. The case is sturdy steel (heavier than aluminum-cased competitors at 38kg). The BMS is a 200A continuous / 250A peak unit — adequate for most van builds. Bluetooth monitoring works through the Xiaoxiang BMS app (not the prettiest app, but functional). The heating pad is a bonus — it activates below 0°C and warms cells before allowing charge, solving the winter charging problem without external hardware. What I didn't love: the terminal posts are M8 instead of the more common M10 — you might need different lugs. And the Bluetooth range is shorter than advertised — barely 3 meters through a cabinet wall. For monitoring, I'd still pair it with a Victron SmartShunt for reliable SOC tracking.

ByLeo—Electrical Engineer & VASP Builder

Published March 31, 2026

Frequently asked questions

Is the Elefast 330Ah really 330Ah?▼

Mine tested at 312Ah (94.5% of rated) — honest and competitive with premium brands. Budget batteries vary more between units though. If you get one that tests below 90%, contact the seller.

How does Elefast compare to SOK or BattleBorn?▼

Elefast: $450-550 for 330Ah ($1.50/Ah), heavier steel case, Xiaoxiang BMS, built-in heater. SOK: $400-500 for 206Ah ($2.20/Ah), aluminum case, better app, established reputation. BattleBorn: $700+ for 100Ah ($7/Ah), premium support but expensive. Elefast wins on $/Ah by a wide margin.

Does the built-in heater work well?▼

Yes — it activates at 0°C and warms cells to 5°C before allowing charge. Takes 15-20 minutes in mild cold (-5°C) and 30-40 minutes at -15°C. Draws about 60W during heating. A genuine convenience feature for winter van life.

What's the warranty on Elefast batteries?▼

5-year warranty through the seller (typically Amazon or direct). The BMS is rated for 4,000 cycles at 80% DoD. At one cycle/day, that's 10+ years — the warranty period is the real limiting factor.

Can I parallel two Elefast 330Ah batteries?▼

The Xiaoxiang BMS supports parallel operation. Use equal-length 35mm² interconnect cables and charge both to the same voltage before connecting. Two in parallel = 660Ah / 8.4kWh — a massive bank for van life.

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