Sol-Ark 15K Hybrid Inverter vs. The Competition

May 15, 2025

Not All Solar Energy Systems Are Created Equal

Compare Sol-Ark’s time-tested, industry-leading 15K hybrid inverter vs the competition for power backup for your home. When you need reliability and simplicity, not all all solar energy systems deliver equally.

	Sol-Ark® 15K Whole Home	EG4 18KPV	EG4 FlexBoss21 + GridBoss	Tesla Powerwall 3
AC Output (Solar/Batt)	15kW / 12kW	12kW	16kW / 12kW	11.5kW
PV Input Limit	19.5kW DC + AC Coupling	21kW DC	25kW DC	20kW DC
Battery Compatibility	Any 48V Battery up to 470kWh	Any 48V Battery	Any 48V Battery	Tesla-Only at 54kW Max
Warranty (Offline)	10 years; Offline Ok	10 years; Offline Ok	10 years; Offline Ok	Online Required
Generator Connection	Gen or Grid Connection; Has 2-Wire Start	Gen or Grid Connection; Has 2-Wire Start	Requires GridBoss to Activate; 2-Wire Start	Requires Tesla Gateway 3
On-Grid & Off-Grid Capable	On-Grid and Off-Grid	On-Grid and Off-Grid	On-Grid and Off-Grid	On-Grid Only
Data Server Location	AWS; United States	Unknown	Unknown	AWS; USA and China
Product Support Quality	7 Days, U.S. Support Center: *92% Call Answer Rate &* *:19 Avg. Wait Time*	Support Phone # Hidden	Support Phone # Hidden	Long Wait Times
Total System Price: (Inverter + Battery)	– 15K Whole Home: $6,250 – Renon Xcellent Plus (16kWh): $3,477 Total: $9,727 Total $/kW: $649 Total $/kWh: $602	– EG4 18KPV: $4,898 -EG4 All Weather (14.7 kWh): $4,100 Total: $8,998 Total $/kW: $750 Total $/kWh: $612	– FlexBoss21: $4,199 – GridBoss: $2,400 – LCD Screen: $110 -EG4 All Weather: $4,100 Total: $10,809 Total $/kW: $676 Total $/kWh: $735	– Powerwall 3: $8,200 – Gateway 3: $900 -Required Accessories: $200 – Full Backup Expansion: $6,000 (optional) Total: $9,300 Total $/kW: $604 Total $/kWh: $674

The Sol-Ark® 15K Whole Home Inverter: The Smart Choice for Full Home Power Backup

200A GRID PASSTHROUGH

No additional hardware needed
simpler installations, & seamless
5ms power transfer.

CLOSED-LOOP COMMUNICATION

With over 20+ Battery Brands
for smarter charging and
better performance.

SYSTEM DESIGN FREEDOM

6 PV inputs, 3 full-sized
MPPTs for energy scalability
and panel placements.

Let’s Build Your Next Home Energy Storage Solution

Our team is ready to help you scale smarter. Whether you’re upgrading homes or planning for off-grid solutions, the Sol-Ark® 15K hybrid inverter gets it done with less complexity and more reliability.