Big Rig / Family 24V (600W / 200Ah 24V / 3000W)

A large fifth-wheel or family rig that needs a residential fridge, microwave and brief rooftop-AC-via-inverter. Built at 24V so the wiring stays sane: a 3000W inverter at 24V pulls half the current it would at 12V.

System

24V

Solar array

600W

Usable storage

4,800Wh

Runtime / charge

38.4h

Parts total

$2,580

✓ All compatibility checks pass

Parts list

Part	Qty	Price	Why this pick
panel Renogy Renogy 200W 12V Monocrystalline Rigid Solar Panel	3×	$570	Best dollars-per-watt rigid pick for mid-size builds, fewer panels and connections than equivalent 100W modules.	Buy at Renogy →
charge controller Victron Energy Victron SmartSolar MPPT 150/35	1×	$300	150V input and 48V support make it the flexible premium pick for higher-voltage arrays and strings.	View Victron Energy listing ↗
battery LiTime LiTime 24V 100Ah LiFePO4	2×	$960	Mid-tier 24V option for higher-power builds that benefit from reduced current and thinner cabling.	View LiTime listing ↗
inverter Victron Energy Victron MultiPlus 24/3000/70-50 Inverter/Charger	1×	$750	All-in-one premium inverter/charger that consolidates inverting, shore charging, and transfer switching for serious 24V off-grid builds.	View Victron Energy listing ↗
System total		$2,580	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 24V system.

✓ Panel ↔ Controller: Your 600W array stays under the 150V PV limit (24.7V ×1.25 cold = 31V per panel; up to 4 in series).

✓ Controller ↔ Battery: Controller charges a 24V bank and tapers correctly for lithium/AGM profiles.

✓ Inverter ↔ Battery: 2400W needs ~114A from the bank; the 2× bank delivers 200A continuous — comfortable headroom.

Wire & fuse starting point

Run	Max current	Wire (AWG)	Fuse / breaker
Solar array → Charge controller	29A	10 AWG	40A
Charge controller → Battery	35A	8 AWG	50A
Battery → Inverter	106A	1 AWG	150A

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.

Cleanest high-power option: at 24V the 2400W continuous inverter only needs ~114A from the 200A bank, with comfortable headroom. No catalog DC-DC outputs 24V, so alternator charging is omitted here.

Tune this build in the planner →

FAQ

Why 24V instead of 12V for a big rig?

A 3000W inverter at 12V draws ~285A — that needs 4/0 cable and massive lugs. At 24V the same inverter draws ~140A, so you can use far smaller, cheaper, safer wiring. Above ~2000-3000W of inverter, 24V is usually the right call.

Can I still charge from the alternator at 24V?

Yes, but it needs a 24V-output DC-DC charger (a 12V-to-24V step-up unit), which isn't in this catalog yet. This build leans on solar and shore power; add a 24V DC-DC if you want alternator charging.

Is the MultiPlus overkill?

It's an inverter/charger combo, so it also charges the bank from shore power and includes a transfer switch — for a family rig that plugs in at campgrounds, that integration is worth it over a standalone inverter.

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