Build your full OUPES system
Vendor-locked configuration — only components OUPES themselves sells as compatible. We don't suggest cross-brand mixes that the manufacturer doesn't bless.
Running total
$2,239
Saves $210 vs MSRP
Why we don't suggest cross-brand mixing: connecting an OUPES battery to a different-brand unit isn't supported by either manufacturer's warranty, and the BMS protocols don't speak to each other. We only configure within a single brand's blessed ecosystem. If you want to mix brands, that's an intentional DIY choice — and you'll want a different tool than this one.
1
Base unit · selected from fit-test
Mega 3 · 3,072Wh · 3,600W AC · 7,000W surge
Default. View SKU details
$1,049
OUPES Direct
3
Solar input · None · AC charging only
Add solar panels
$0
None
AC-only
$0
Starter
1× 100W Lightweight Flexible Solar Panel (Black Division)
+$138.99
100W
~44h ☀
Balanced
5× RSP220LSC
+$1,699.95
1100W
~4h ☀
Custom
Configure manually
Solar is optional. Add panels for off-grid runtime.
4
Cables & adapters · auto-suggested
In-box for this configuration
$0
all included
| Item | Why needed | Status |
|---|---|---|
| Mega 3 ↔ B5 Extra Battery cable | Proprietary; ships with B5 Extra Battery | In box |
RV note: The Mega 3 has a native TT-30R outlet — a standard 30A RV plugs in directly, no L14-30 adapter needed. For 50A RVs you'd add a TT-30 → 14-50 adapter (~$35) but you'll only get 120V on each leg, not split 240V.
5
Hardwired home backup · optional · 120V loads only
OUPES Power Saver Kit / Inlet Box
OUPES-blessed path for hardwired home backup. Powers selected 120V circuits during outage · electrician install required
Coming soon
Skip if: you'll use the Mega 3 with extension cords or unplug-and-plug into appliances directly. Add if: you want a hardwired path to a transfer-switched 120V subpanel covering specific circuits (furnace, lights, refrigerator).
Your shopping list
2 items · OUPES system
Mega 3
via OUPES Direct
$1,049
1× B5 Extra Battery
via OUPES Direct
$1,190
Hardwired home backup
Not added · optional
—
Subtotal (MSRP)$2,449
Bundle / flash savings−$210
System total$2,239
Saves $210 vs MSRP today
6,144 Wh total energy capacity
Future upgrade path
Plan ahead. Your config can grow up to 15,360 Wh on this same Mega 3 base.
- +1yrAdd another B5 Extra Battery → 9,216 Wh total · ~$1,190 · longer autonomy
- +2yrAdd yet another B5 Extra Battery → 12,288 Wh max system · ~$1,190
- +3yrAdd more PV — High PV input still has headroom for additional series array