Featured Products

EG4 Electronics 18kPv + 1 x EG4 Electronics PowerPro 14.3kWh Capacity Energy Storage System

Fortress Power eForce 19.2 19.2kW Energy Storage System (19.2kWh Capacity)

Envy 12kW 1-Phase Energy Storage System – 4 eFlex 5.4 G2 Modules, DuraRack - Envy12KW4-DuraRack

Sol-Ark L3 Series SA-L3-60K-HV-60-IP55 61.44kWh 614.4VDC 277/408VAC IP55 Outdoor Commercial Battery Energy Storage System

Batteries / Energy Storage Systems (ESS): Reliable Energy Solutions

Top Products & Key Specifications

• Fortress Power Avalon HV Pro ESS (7.6 kW inverter, 29.4 kWh)
  Hybrid-ready ESS with an advanced smart energy panel, UL9540A certification, and NEMA 3R/4X rating. It suits both indoor and outdoor installations and provides robust backup energy for diverse applications.
• Simpliphi (Briggs & Stratton) SPHI-ESS Series
  This lineup presents modular capacities tailored to fit your requirements, including:
• SPHI-ESS-15-6 – About 14.94 kWh
• SPHI-ESS-20-6 – Around 19.92 kWh
• SPHI-ESS-25-12 – Nearly 24.90 kWh
• SPHI-ESS-30-12 – Approximately 29.88 kWh
• SPHI-ESS-40-18 – About 39.84 kWh with solar-to-utility efficiency up to 96.5% and battery-to-load efficiency reaching 91%. This system includes advanced safety features like anti-islanding and AFCI protection. It also supports intuitive EnergyTrak monitoring through LCD screens and smartphone apps.
• Victron Energy Batteries
• LiFePO₄ Battery 256 V / 200 Ah – Smart-A: Equipped with smart monitoring, Bluetooth connectivity, and excellent protection against overloads and shocks.
• 12 V / 220 Ah Gel Deep Cycle Battery: Uses immobilized gel technology for superior deep-discharge recovery and maintenance-free operation, featuring less than 2% self-discharge monthly.
• Lead-Carbon Battery 12 V / 106 Ah (M8 Terminal): Designed to improve cycling performance and reduce sulfation with advanced lead-carbon composite technology.

Why Choose Our Batteries / Energy Storage Systems (ESS)?

• Range of Capacities & Configurations—Select from compact 5 kWh models to expansive modular 40 kWh systems. These scalable options address both residential and commercial energy needs.
• Hybrid-Ready & Efficient—Fortress Power and Simpliphi systems integrate effortlessly with solar panels for home and commercial grid backup.
• Safety & Compliance—Our UL9540A-rated ESS models include built-in protections, ensuring safe and reliable performance across varied environmental conditions.
• Smart Monitoring & Control—EnergyTrak apps, LCD panels, and Bluetooth tools provide real-time visibility and control for optimized energy management.

Batteries / Energy Storage Systems (ESS) for Residential and Commercial Needs

• Residential Resilience—Compact, safe energy solutions like the AccESS 6 kW or smaller Simpliphi units enhance backup power and complement solar panels for home use.
• Mid-Sized & Whole-Home Backup—Simpliphi’s mid-tier ESS models in the 20 to 30 kWh range provide dependable power during outages, ideal for whole-house energy support.
• Scalable & Hybrid Deployments—Fortress and modular Simpliphi systems support future expansion and hybrid energy setups, working well with solar panels for home energy needs.
• Versatile Battery Options—Victron batteries provide cost-efficient energy storage tailored for DIY projects, microgrids, off-grid uses, or locations near self storage facilities.

With the growing demand for energy efficiency and backup solutions, our Batteries / Energy Storage Systems (ESS) are designed to provide reliable energy whenever needed. These systems can be a key component in improving home energy resilience, especially in locations with unreliable grids or frequent outages. Whether you are searching for car battery replacement alternatives or expanding your property’s energy storage, our ESS collection offers advanced and trusted options.

Additionally, the integration of solar panels for home power solutions is smoother with our hybrid-ready ESS products. They efficiently store excess solar energy and discharge it during peak demand or power loss, minimizing reliance on conventional utilities. This smart use of energy supports sustainability goals while lowering energy bills.

For customers who also need local storage options, pairing your energy setup with self storage near me or uhaul near me solutions can maximize space and convenience. Combining quality ESS with strategic storage choices provides an all-in-one approach for energy security and asset management.

Optimize your energy infrastructure with Portlandia Electric Supply’s Batteries / Energy Storage Systems (ESS) collection, a solution built for high performance, reliability, and safety. This range covers compact, reliable backup systems and expandable hybrid solutions suitable for various applications—residential to commercial. Invest in excellence and ensure consistent power availability for your critical needs.

Shop Solar Batteries & Energy Storage — LiFePO4, Lithium, and Lead-Acid

Portlandia Electric Supply stocks solar batteries and energy storage systems from 15+ manufacturers including EG4, Battle Born, Victron, Generac, and Schneider Electric. We carry lithium iron phosphate (LiFePO4) batteries, server rack batteries, wall-mount batteries, battery enclosures, and complete battery management systems. All batteries ship with full manufacturer warranties and technical support.

Types of Solar Batteries: Which Chemistry Is Right for You?

LiFePO4 (Lithium Iron Phosphate) — The Gold Standard

LiFePO4 batteries are the most popular choice for solar energy storage. They offer 6,000–15,000 charge cycles, 95%+ round-trip efficiency, and are thermally stable (non-combustible). Best for: Residential and commercial solar + storage, off-grid systems, backup power. Price range: $500–$4,000 per battery (5–16kWh). Popular brands: EG4, Battle Born, Victron, SOK.

Server Rack Batteries — Scalable and Modular

Server rack batteries are designed for 19" rack enclosures, allowing easy stacking and expansion. Most support parallel connections (up to 16–64 units) for massive capacity. Best for: Home battery banks, commercial installations, and systems that may expand over time. Popular brands: EG4 LifePower4, EG4 LL, SOK Server Rack. Price range: $1,200–$2,500 per 5.12kWh unit.

Wall-Mount Batteries — Space-Saving Design

Wall-mount batteries are designed for indoor installation, saving floor space and integrating with home aesthetics. Most are IP20-rated for indoor use. Best for: Residential homes with limited space. Popular brands: EG4 WallMount, Tesla Powerwall (not sold by PES). Price range: $1,500–$3,500 per 5–16kWh unit.

Lead-Acid and AGM Batteries — Budget Option

Lead-acid and AGM (Absorbed Glass Mat) batteries are the most affordable option for solar storage. However, they have shorter lifespans (500–1,500 cycles), lower efficiency (80–85%), and heavier weight. Best for: Budget-conscious off-grid systems, RVs, and temporary installations. Price range: $200–$800 per 100Ah unit.

How to Size Your Solar Battery Bank

The right battery bank size depends on your daily energy consumption, backup power needs, and budget. Here's how to calculate:

Step 1: Calculate Daily Energy Use

A typical US home uses 30–50 kWh per day. For off-grid, size your battery bank for 2–3 days of autonomy (no sun). For grid-tied backup, 1 day of critical loads (refrigerator, lights, well pump) is usually sufficient.

Step 2: Account for Depth of Discharge (DoD)

LiFePO4 batteries can discharge 80–100% without damage. Lead-acid should only discharge 50%. So a 10kWh LiFePO4 battery provides 8–10kWh of usable energy, while a 10kWh lead-acid battery provides only 5kWh.

Step 3: Example Sizing

Top Solar Battery Brands at Portlandia Electric Supply

• EG4 Electronics — LifePower4, LL, and WallMount series. The #1 value brand in solar storage. 6 SKUs in stock.
• Battle Born — Premium LiFePO4 drop-in replacements. 10-year warranty, 3,000+ cycles. 2 SKUs in stock.
• Victron Energy — LiFePO4 and AGM batteries with integrated BMS. Best for marine and off-grid. 2 SKUs in stock.
• Generac — PWRcell battery systems. Modular, 9–18kWh, smart management. 3 SKUs in stock.
• Schneider Electric — Conext battery systems. Commercial-grade, scalable. 1 SKU in stock.
• SOK — Server rack and wall-mount LiFePO4. Excellent value, UL listed. 2 SKUs in stock.
• Renogy — AGM and LiFePO4 batteries for RV and marine. Budget-friendly. 1 SKU in stock.
• Fullriver — High-durability AGM batteries. Maintenance-free, 5-year warranty. 1 SKU in stock.

Why Buy Solar Batteries from Portlandia Electric Supply?

• Authorized Dealer — Full manufacturer warranties honored.
• Technical Support — Call (888) 876-0007 for battery sizing, BMS configuration, and compatibility.
• Volume Pricing — Discounts for 4+ battery orders. Request a quote.
• System Bundles — Inverter + battery kits designed for compatibility. Browse kits.
• Fast Delivery — In-stock batteries ship same-day or next-day.
• NET 30 Terms — Available for qualified contractors. Apply here.

Frequently Asked Questions About Solar Batteries

How long do solar batteries last?

LiFePO4 batteries last 6,000–15,000 cycles (15–25+ years at one cycle per day). Lead-acid batteries last 500–1,500 cycles (3–7 years). Most LiFePO4 batteries come with 10-year warranties.

How many solar batteries do I need?

It depends on your daily energy use and backup goals. For grid-tied backup, 1–2 days of critical loads (refrigerator, lights, well pump) is typical. For off-grid, 2–3 days of autonomy is standard. A typical home backup system uses 2–6 EG4 5.12kWh batteries (10–30kWh total). Call (888) 876-0007 for a free sizing calculation.

Can I mix different brands of batteries?

No. Batteries must be the same brand, model, age, and state of charge to be connected in parallel. Mixing different chemistries (LiFePO4 + lead-acid) or different brands will damage the batteries and void warranties. If you need more capacity, add identical batteries from the same batch when possible.

Do solar batteries work in cold weather?

LiFePO4 batteries perform well in cold weather but charge slower below freezing. Many models have built-in heating elements or should be installed in a climate-controlled space. Lead-acid batteries perform poorly in cold and lose significant capacity. Always check the manufacturer's temperature specifications.

What is the best battery for a DIY solar system?

For DIYers, we recommend EG4 LifePower4 or EG4 LL server rack batteries. They're plug-and-play with most hybrid inverters, have built-in BMS, and are the best value per kWh. The Battle Born line is excellent for RV and marine applications where drop-in replacement is needed.

Ready to Choose Your Battery?

Browse our battery inventory below, or get a custom system quote including panels, inverter, and battery bank. Call (888) 876-0007 for expert battery sizing and system design.