Compare Inverter & Battery Specifications
Here you can compare the main inverter and battery specifications for popular brands including Tesla, EcoFLow, Sigenergy, Fox ESS, Alpha ESS and Hanchu ESS. Select which ones you want to compare side-by-side to review, save as PDF or print. Use the “Best For” and “Pros and Cons” tabs for more details.
primeenergysolutionsltd.com
System Comparison
PRIME ENERGY SOLUTIONS · Inverter & Battery Guide
Powerwall 3
Integrated inverter + 13.5 kWh battery · All-in-one unit
Premium · High-power · All-in-oneInverter
Inverter type
Built-in hybrid (DC-coupled)No separate inverter needed
Continuous output
11.5 kWMost powerful in class
Solar input (max)
20 kW DC
MPPT channels
6 independent MPPTsIdeal for complex/multi-aspect roofs
Round-trip efficiency
97.5%Industry-leading
Grid connection
Single phase
Battery
Usable capacity
13.5 kWhFull usable — no derating needed
Chemistry
NMC (Nickel Manganese Cobalt)Higher energy density; different to LFP
Depth of discharge
100% usableTesla manages state-of-charge internally
Cycle life
~3,000 cyclesLower than LFP competitors
Max expandable
Up to 54 kWh totalExpansion battery packs available
Backup power
Full whole-home backupAutomatic switchover during outage
Pros — in order of importance
1Strongest single-unit output and whole-home backup capability
2High solar input allowance and six MPPTs
3Very strong ecosystem and EV integration
4Premium all-in-one design for simpler installation logic
Cons — in order of importance
1Higher purchase price than many alternatives
2NMC chemistry has shorter cycle life than LFP
3More locked into the Tesla ecosystem
4Can be oversized for smaller or simpler homes
Best suited to
- Homes with higher energy use, including larger families and busy households
- Customers who want strong backup capability and dedicated EV integration
- Properties with complex roofs or multiple roof faces
- Customers comfortable with a premium brand-led ecosystem
May be less suitable if…
- Budget-sensitive customers looking for lower-cost alternatives
- Smaller homes where a large battery may be unnecessary
- Households prioritising maximum cycle life over brand status
PowerOcean range
5–10 kW inverter + 5.1–10.2 kWh LFP battery range · safety-first design
Safety-focused · LFP · 15-year warrantyInverter
Inverter type
Hybrid string inverter (grid-tied)Separate inverter + battery units
Rated output
5–10 kW continuousRange varies by inverter size
Backup output
5–10 kW during outageSupports larger domestic loads during blackouts
Solar input (max)
6–12 kW DCDepends on the inverter model and array design
MPPT channels
2 MPPTs
Max efficiency
>96.5%
IP rating (inverter)
IP65
Battery
Capacity (entry)
10.2 kWh LFPLithium Iron Phosphate chemistry
Max expandable
Up to 20 kWh (1-phase)Up to 4 battery packs stacked for bigger homes
Cycle life
>6,000 cyclesLong-life LFP durability
Safety standard
PAS 63100:2024 compliantUK safety standard for residential battery systems
Fire prevention
Active fire prevention moduleResponds before fire escalates
IP rating (battery)
IP65 aluminium casing
Pros — in order of importance
1Strong safety story and PAS 63100:2024 compliance
215-year warranty with long-life LFP chemistry
3Modular and expandable to 20 kWh
4CT meter included as standard
Cons — in order of importance
1Two separate units rather than one all-in-one product
2Limited MPPT flexibility relative to Tesla
3Smaller inverter range than some alternatives
4Lower brand recognition in the home battery market
Best suited to
- Homeowners who value safety and long-term reassurance
- Families with larger daytime loads and a desire for flexibility
- Customers with an existing solar system who want a battery retrofit option
- People looking for a strong warranty and dependable backup performance
May be less suitable if…
- Customers with very complex roof layouts wanting maximum MPPT flexibility
- Homeowners who want the highest possible backup output in one system
- People who prefer a premium brand-first proposition
Ocean 2 range
3.6–10 kW hybrid inverter + 5.1–10.2 kWh LFP battery range · higher-power Ocean series
Ocean 2 · range · PAS 63100Inverter
Inverter type
Hybrid string inverter (AC-coupled)Designed for retrofit and new-build solar
Rated output
3.6–10 kW continuousRange depends on the model selected
Backup output
5–10 kW peakSuitable for larger essential-load backup
Solar input (max)
8–14 kW DCHigher headroom for larger rooftops
MPPT channels
3 MPPTs
Max efficiency
>96.8%
IP rating (inverter)
IP65
Battery
Capacity
10.2 kWh LFPHigher usable storage than PowerOcean
Max expandable
Up to 20 kWhTwo battery packs supported
Cycle life
>6,000 cyclesLFP longevity
Safety standard
PAS 63100:2024 compliantHigh safety standard for residential battery systems
Fire prevention
Active fire prevention moduleSame safety strategy as PowerOcean
IP rating (battery)
IP65 aluminium casing
Pros — in order of importance
110 kW capable inverter output for larger homes
2High safety rating and long warranty
3Strong battery capacity and 15-year assurance
4Robust option for upgrade customers and larger loads
Cons — in order of importance
1Three MPPTs still trail Tesla on complex roof layouts
2Separate inverter and battery units
3Premium price compared with the entry-level PowerOcean option
4Brand recognition remains lower than Tesla
Best suited to
- Homeowners wanting a higher-power EcoFlow option for a larger home
- Customers with a bigger daytime demand profile
- People upgrading an existing solar setup and wanting more capability
- Households wanting a practical balance of performance, monitoring and value
May be less suitable if…
- The lowest-cost EcoFlow option
- Households that want the highest possible backup output available
- Highly complex roof shapes which need the most MPPT flexibility
Sigenergy SigenStor range
3–15 kW hybrid inverter + 5–40 kWh modular battery range · scalable energy system
Single / 3 phase · Modular · Smart appInverter
Inverter type
Single-phase hybrid inverterBattery-ready and grid-tied
Rated output
3–15 kW continuousDepends on the inverter size selected
Backup output
3–15 kW backupSupports the required essential loads during outages
Solar input (max)
8–15 kW DCVaries across the range
MPPT channels
3 MPPTs
Max efficiency
97.5%
Grid connection
Single / 3 phase
IP rating
IP66
Battery
Battery chemistry
LFPStable long-life chemistry
Battery capacity
10.0 kWh entry sizeModular expansion possible
Cycle life
6,000+ cyclesGood long-term durability
Max expandable
Modular packs supportedScales with household demand
Backup mode
Yes — UPS-style switching
Pros — in order of importance
1Modern modular architecture with app-driven control
2Good long-life LFP battery profile
3Strong flexibility for expanding energy needs later
4Well suited to homes wanting app monitoring and whole-system control
Cons — in order of importance
1Not the cheapest option on the page
2Three MPPTs are practical but not the most granular in the group
3Premium positioning requires a strong modular story to justify the spend
Best suited to
- Customers who want a modern app-based system with flexible storage options
- Homeowners who may want to expand battery setup over time
- Households that value long-life battery chemistry and smart controls
- People upgrading an existing solar setup with a straightforward single-phase system
May be less suitable if…
- Customers needing the highest possible backup output
- Those with unusually complex roof layouts demanding maximum MPPT granularity
Fox ESS range
3.6–10 kW hybrid inverter + 5.1–20 kWh LFP battery range · compact, value-led storage
Single / 3 phase · Compact · Value-ledInverter
Inverter type
Single-phase hybrid inverterDesigned for domestic energy storage
Rated output
3.6–10 kW continuousRange varies by inverter size
Backup output
3.6–10 kW backupCovers the required essential loads
Solar input (max)
7–12 kW DCDependent on the selected model
MPPT channels
3 MPPTs
Max efficiency
97.2%
Grid connection
Single phaseStandard domestic connection
IP rating
IP66
Battery
Battery chemistry
LFPSafer, longer-life chemistry
Battery capacity
10.24 kWhCompact and practical across a range of home loads
Cycle life
6,000+ cycles
Max expandable
Modular battery supportKeeps the system scalable
Backup mode
Yes — essential load support
Pros — in order of importance
1Compact and practical for smaller homes or simpler roof layouts
2Long-life LFP chemistry and good value
3Straightforward app control and low-cost positioning
4A sensible option for budget-conscious domestic installs
Cons — in order of importance
1Three MPPTs are workable but not the most flexible in the group
2Less brand recognition than Tesla
3No premium brand halo compared with premium-tier options
Best suited to
- Budget-conscious customers who still want a reliable single-phase hybrid system
- Smaller homes or simpler roof layouts with moderate solar generation
- Homeowners who want a compact unit with straightforward app control
- Customers looking for a practical value option for a retrofit or new installation
May be less suitable if…
- Customers wanting a premium brand with maximum backup headroom
- More complex roofs that require the greatest MPPT flexibility
Hanchu ESS range
5–15 kW inverter + 5.1–30 kWh LFP battery range · cold-weather optimised
Best value · Cold-climate · AI monitoringInverter
Inverter type
Hybrid / AC retrofit inverterWorks as hybrid or AC-coupled retrofit
Rated output
5–15 kW continuousRange varies by inverter size
Backup output
5–15 kW UPS backupEssential appliances protected during outage
Solar input (max)
7–12 kW DCDepends on model and array design
MPPT channels
3 MPPTs
IP rating (inverter)
IP66Higher water resistance than IP65 competitors
Installation
Indoor or outdoorIP66 enables outdoor wall mounting
Battery
Capacity
10.24 kWh LFPLarger modular storage option within the range
Depth of discharge
95% DoDHigher than many competitors
Cycle life
6,000+ cyclesStrong long-term durability
Cold weather
Strong cold-weather performanceDesigned for low-temperature operation and winter resilience
Fire suppression
Built-in aerosol fire suppressionActive safety beyond standard BMS
Expandability
Up to 16 batteries in parallel
Pros — in order of importance
1Strong cold-weather performance and winter resilience
2Very competitive value and cost-per-kWh story
3AI-driven monitoring and weather compensation
4Proactive fire-suppression hardware and strong battery longevity
Cons — in order of importance
1Lower brand recognition than Tesla or EcoFlow
212-year warranty is shorter than EcoFlow’s 15-year cover
3Emerging brand history is less established than some incumbents
Best suited to
- Customers who want strong value with long-life battery technology
- Properties in colder or more exposed locations
- Households wanting smart tariff integration and advanced monitoring
- Homeowners looking for a practical retrofit solution with dependable performance
May be less suitable if…
- Customers wanting a widely recognised household brand name
- Households prioritising maximum backup output for very high-demand loads
- Buyers who prioritise specific PAS 63100 safety compliance in the sales story
Alpha ESS SMILE range
Modular hybrid inverter + LFP battery range · available from 3–15 kW inverter and 5.7–30 kWh storage
Modular · LFP · Range-basedInverter
Inverter type
Single / three-phase hybrid inverterSuitable for both standard domestic and larger installs
Output range
3–15 kWCovers small, medium and larger homes
Solar input (max)
8–18 kW DCGood headroom across the range
MPPT channels
2–4 independent MPPTsVaries by inverter size and model
Efficiency
96–98%Strong conversion efficiency across the range
Grid connection
Single / 3 phase
IP rating
IP66
Battery
Battery chemistry
LFPStable, durable and commonly used in long-life storage
Capacity range
5.7–30 kWhModular architecture supports household scaling
Cycle life
6,000+ cyclesLong-life LFP durability
Depth of discharge
90–100%Depends on stack and model configuration
Expandability
Modular battery stacking supportedScales to suit future load growth
Backup support
Yes — UPS-style backup capabilitySuitable for essential loads and selected circuits
Pros — in order of importance
1Broad range of sizes from small domestic to larger homes
2Modular architecture works well for future expansion
3Strong LFP chemistry and practical system scalability
4Good value proposition while covering a wide capacity spread
Cons — in order of importance
1Lower brand recognition than Tesla
2Requires careful model selection to match roofing and load profile
3A less established brand story than premium market leaders
Best suited to
- Households needing a flexible product range across multiple home sizes
- Customers who may grow their system over time
- People wanting a modular LFP approach with scalable storage
- Installations that benefit from greater flexibility in inverter sizing
May be less suitable if…
- Customers specifically wanting a premium brand identity
- Projects needing a fully documented safety package and cert chain for a specific model
⚡ Inverter & Battery Specifications
Rated output
Tesla11.5 kW
EcoFlow5–10 kW
EcoFlow3.6–10 kW
Sigenergy3–15 kW
Fox3.6–10 kW
Hanchu5–15 kW
Alpha ESS3–15 kW
Grid connection
TeslaSingle phase
EcoFlowSingle phase
EcoFlowSingle phase
SigenergySingle / 3 phase
FoxSingle / 3 phase
HanchuSingle / 3 phase
Alpha ESSSingle / 3 phase
MPPT channels
Tesla6 MPPTs
EcoFlow2 MPPTs
EcoFlow3 MPPTs
Sigenergy3 MPPTs
Fox3 MPPTs
Hanchu3 MPPTs
Alpha ESS2–4 MPPTs
Solar input (max)
TeslaUp to 20 kW
EcoFlow6–12 kW
EcoFlow8–14 kW
Sigenergy8–15 kW
Fox7–12 kW
Hanchu7–12 kW
Alpha ESS8–18 kW
Round-trip efficiency
Tesla97.5%
EcoFlow>96.5%
EcoFlow>96.8%
Sigenergy97.5%
Fox97.2%
Hanchu>97%
Alpha ESS96–98%
Backup output
Tesla11.5 kW whole-home
EcoFlow5–10 kW
EcoFlow5–10 kW
Sigenergy3–15 kW
Fox3.6–10 kW
Hanchu5–15 kW
Alpha ESS3–15 kW
Usable capacity
Tesla13.5 kWh
EcoFlow5.1–10.2 kWh
EcoFlow5.1–10.2 kWh
Sigenergy5–40 kWh
Fox5.1–20 kWh
Hanchu5.1–30 kWh
Alpha ESS5.7–30 kWh
Max expandable
TeslaUp to 54 kWh
EcoFlowUp to 20 kWh
EcoFlowUp to 20 kWh
SigenergyModular to 40+ kWh
FoxModular
HanchuUp to 81.9 kWh
Alpha ESSModular to 30+ kWh
Cycle life
Tesla~3,000
EcoFlow6,000+
EcoFlow6,000+
Sigenergy6,000+
Fox6,000+
Hanchu6,000–8,000+
Alpha ESS6,000+
Warranty
Tesla10 years
EcoFlow15 years
EcoFlow15 years
Sigenergy10 years
Fox10 years
Hanchu12 years
Alpha ESS10 years