Fortress eVault Max 18.5kWh

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Fortress Power battery

Fortress publishes a real document library, per product, with revision dates, which is rarer than it should be and is why several pairings on this site resolve to match rather than unverified. The eVault is heavy enough that the install location is a structural question, not a preference. Check the floor before you check the wiring.

Published figures

Usable capacity: 18.5 kWh
Capacity: 360 Ah
Voltage window: 44.8 to 58.4 V
Max charge current: 133 A
Max discharge current: 133 A
Comms: CAN, RS485
Form factor: Floor standing
Units in parallel: 10

Source status: Read from datasheet Typical street price $6,000 to $8,000. Charge and discharge limits are per unit. Wiring packs in parallel raises both.

How many you need, by inverter

One pack accepts 133 amps. An inverter that can deliver more than that needs more than one, or the charge rate capped in settings. Both are valid, and the second one costs you charging speed on the short days when you need it most.

Inverter	Charger	Packs to take it all	Bank capacity	Comms	Result
Victron MultiPlus-II 48/3000	35 A	1	18.5 kWh	VE.Bus, CAN	Match
Victron MultiPlus-II 48/5000	70 A	1	18.5 kWh	VE.Bus, CAN	Match
Victron Quattro 48/5000	70 A	1	18.5 kWh	VE.Bus, CAN	Conflict
EG4 3000EHV-48	80 A	1	18.5 kWh	RS485	Unverified
Growatt SPF 3000TL LVM-48P	80 A	1	18.5 kWh	RS485	Unverified
MPP Solar LV2424	80 A	1	18.5 kWh	RS485	Conflict
OutBack VFXR3648A	85 A	1	18.5 kWh	Modbus	Conflict
Growatt SPF 5000 ES	100 A	1	18.5 kWh	RS485	Conflict
Sol-Ark 30K-3P	100 A	1	18.5 kWh	CAN, RS485	Conflict
MPP Solar PIP-5048MK	100 A	1	18.5 kWh	RS485, CAN	Conflict
GoodWe ES G2 5048	100 A	1	18.5 kWh	CAN, RS485	Conflict
Renogy REGO 48V 3500W	100 A	1	18.5 kWh	CAN, RS485	Unverified
Schneider Conext SW 4048	105 A	1	18.5 kWh	Modbus	Conflict
Victron MultiPlus-II 48/8000	110 A	1	18.5 kWh	VE.Bus, CAN	Conflict
LuxPower LXP 5K Hybrid	110 A	1	18.5 kWh	CAN, RS485	Conflict
EG4 6000XP	120 A	1	18.5 kWh	CAN, RS485	Conflict
Growatt SPF 6000T DVM	120 A	1	18.5 kWh	RS485, CAN	Conflict
MPP Solar LV6548	120 A	1	18.5 kWh	RS485, CAN	Conflict
Sol-Ark 5K	120 A	1	18.5 kWh	CAN, RS485	Match
Deye SUN-5K-SG04LP1	120 A	1	18.5 kWh	CAN, RS485	Conflict
Sunsynk 5kW Hybrid	120 A	1	18.5 kWh	CAN, RS485	Conflict
LuxPower SNA5000	120 A	1	18.5 kWh	CAN, RS485	Conflict
Signature Solar 6500EX-48	120 A	1	18.5 kWh	RS485	Conflict
Solis S6-EH1P6K-L	125 A	1	18.5 kWh	CAN, RS485	Unverified
OutBack Radian GS8048A	130 A	1	18.5 kWh	Modbus	Conflict
Victron Quattro 48/10000	140 A	2	37.0 kWh	VE.Bus, CAN	Conflict
Schneider XW Pro 6848	140 A	2	37.0 kWh	CAN, Modbus	Match
Deye SUN-6K-SG03LP1	140 A	2	37.0 kWh	CAN, RS485	Unverified
Sol-Ark 8K	165 A	2	37.0 kWh	CAN, RS485	Match
Sol-Ark 12K	175 A	2	37.0 kWh	CAN, RS485	Match
Deye SUN-8K-SG04LP1	190 A	2	37.0 kWh	CAN, RS485	Unverified
Sunsynk 8kW Hybrid	190 A	2	37.0 kWh	CAN, RS485	Unverified
Victron Quattro 48/15000	200 A	2	37.0 kWh	VE.Bus, CAN	Conflict
Deye SUN-12K-SG04LP3-US	240 A	2	37.0 kWh	CAN, RS485	Unverified
EG4 18KPV	250 A	2	37.0 kWh	CAN, RS485	Unverified
EG4 FlexBoss21	250 A	2	37.0 kWh	CAN, RS485	Unverified
LuxPower LXP-LB-US 12K	250 A	2	37.0 kWh	CAN, RS485	Unverified
EG4 12000XP	250 A	2	37.0 kWh	CAN, RS485	Conflict
Growatt SPF 12000T DVM	250 A	2	37.0 kWh	RS485, CAN	Conflict
Sol-Ark 15K	275 A	3	55.5 kWh	CAN, RS485	Match

Parallel limit published for this pack: 10.

Communication

Manufacturer documentation names Sol-Ark 12K, Sol-Ark 15K, Schneider XW Pro 6848, Victron MultiPlus-II 48/5000 for closed-loop operation with this pack.

Where the figures come from

Manufacturer documents: Fortress Power document library. Figures here should be read against the revision that covers your serial number, because manufacturers revise specifications without changing the model name.

Where to buy the Fortress eVault Max 18.5kWh

Listings for the Fortress eVault Max 18.5kWh plus the rack hardware and cabling a clean install needs.

Check price on Amazon Server rack for battery Battery interconnect cables

Affiliate links. As an Amazon Associate this site earns from qualifying purchases, at no extra cost to you. Prices and stock change often, and a listing appearing here is not a statement that the pairing above is approved.

Questions people actually ask

How many Fortress eVault Max 18.5kWh packs do I need?

One pack accepts 133 amps and holds 18.5 kWh. Match the pack count to your inverter’s charge current first, then check the energy. A Sol-Ark 15K at 275 amps would take 3 of them to charge at full rate.

Does the Fortress eVault Max 18.5kWh do closed loop communication?

It publishes CAN, RS485. Manufacturer documentation names Sol-Ark 12K, Sol-Ark 15K, Schneider XW Pro 6848, Victron MultiPlus-II 48/5000 specifically.

How many can I wire in parallel?

The published limit is 10 units.

Which inverters pair cleanly with the Fortress eVault Max 18.5kWh?

Sol-Ark 12K, Sol-Ark 15K, Victron MultiPlus-II 48/5000, Schneider XW Pro 6848, Sol-Ark 5K, Sol-Ark 8K, Victron MultiPlus-II 48/3000 align on all four checked fields at the bank size shown on each pairing page.