Vanlife Essentials (200W / 200Ah / 2000W + alternator)

The do-everything full-time van build: fridge, fans, laptops, lights, water and a 2000W pure-sine inverter for a blender or Instant Pot, topped up by both solar and the alternator while you drive. All cross-checked to work together.

System

12V

Solar array

200W

Usable storage

2,400Wh

Runtime / charge

38.4h

Parts total

$2,163

! Works — with one caution

Parts list

Part	Qty	Price	Why this pick
panel Renogy Renogy 100W 12V Monocrystalline Rigid Solar Panel	2×	$198	The default reference 100W rigid panel for small RV/van arrays, widely available with consistent datasheet specs.	Buy at Renogy →
charge controller Renogy Renogy Rover 40A MPPT	1×	$165	Reliable mid-tier MPPT and the default 40A pick for most 200-500W van builds.	Buy at Renogy →
battery Renogy Renogy 12V 100Ah Smart Lithium LiFePO4	2×	$1,200	Mid-tier pick with self-heating and smart monitoring, good fit for Renogy-ecosystem builds.	Buy at Renogy →
inverter Renogy Renogy 2000W 12V Pure Sine Wave Inverter	1×	$270	Popular mid-tier 2000W PSW that handles most van/RV loads like microwaves and induction cooktops on a 12V system.	Buy at Renogy →
DC-DC charger Renogy Renogy DCC50S 50A DC-DC with MPPT	1×	$330	Most popular all-in-one DC-DC + MPPT for van builds; eliminates a separate solar controller.	Buy at Renogy →
System total		$2,163	Parts only — wire, fuses, mounts and breakers extra.

Affiliate disclosure: Some links here (Renogy) are affiliate links — if you buy through them we may earn a commission at no extra cost to you. It never changes which part we recommend: picks are ranked by spec fit across every brand, and non-Renogy parts are listed with neutral source links. Sizing and wiring output is guidance, not an electrical sign-off — verify before buying or wiring.

Compatibility checks

✓ System voltage: All components agree on a 12V system.

✓ Panel ↔ Controller: Your 200W array stays under the 100V PV limit (24.3V ×1.25 cold = 30V per panel; up to 3 in series).

✓ Controller ↔ Battery: Controller charges a 12V bank and tapers correctly for lithium/AGM profiles.

! Inverter ↔ Battery: 2000W needs ~189A from the bank; the bank's 200A is enough but with little margin — fine for intermittent loads, tight for sustained max draw.

Wire & fuse starting point

Run	Max current	Wire (AWG)	Fuse / breaker
Solar array → Charge controller	10A	14 AWG	15A
Charge controller → Battery	40A	8 AWG	50A
Battery → Inverter	185A	4/0 AWG	250A
Alternator / DC-DC → Battery	50A	6 AWG	80A

Wire and fuse sizes are a conservative starting point from each run's max current (×1.25). Run length, temperature and local code can change them — confirm with an electrician. Off-grid DC carries real fire and shock risk.

At full 2000W load the 200A bank is adequate but not generous (≈190A demand). Fine for intermittent kitchen loads; if you run big AC loads continuously, step up to a larger bank or a 24V system.

Tune this build in the planner →

FAQ

Why two 100Ah batteries instead of one 200Ah?

A 2000W inverter pulls ~190A from a 12V bank at full tilt. A single 100A-rated battery can't deliver that, so we parallel two 100Ah units for a 200A bank. It's the most common reason van builds end up with two batteries.

Do I need the alternator (DC-DC) charger?

If you drive every few days, yes — the DCC50S pulls a clean charge from the alternator and has a built-in solar MPPT, so one box handles both inputs. On cloudy weeks it's often more reliable than the panels.

Is 200W of solar enough for 1,500Wh/day?

In ~4.5 sun-hours, 200W makes ~630Wh on a good day — it covers a frugal day and slows the drain on others, but the alternator and shore power do the heavy lifting. Add a third panel if you boondock for long stretches.

Build vetted 2026-06-21 · confidence: high. Prices and specs from each part's linked sources.