Lithium vs Lead-Acid Solar Batteries: The Real Up-Front Cost for a US Home
Per battery, lead-acid costs less up front: Renogy lists its 12V 100Ah AGM at $208.99 and its 12.8V 100Ah LiFePO4 at $307.99 (list prices checked October 27, 2026). Per usable kWh the order flips: about $348 for AGM at 50% depth of discharge, about $301 for LiFePO4 at 80%. Inverter, wiring and installation cost extra.
Most people shopping for a solar battery start by comparing sticker prices, and on that view lead-acid looks like the easy win. But a price tag says little about what it costs to run your home on stored solar. A fair comparison counts the energy you can safely use, the gear a bare battery still needs, and how long it lasts. Below you'll find a dated price table, a full parts list for a DIY bank, a same-job comparison with a complete home system, and the current federal tax rule.
Lithium vs Lead-Acid Solar Battery Price per Battery and per Usable kWh
The energy printed on a battery isn't what your home gets to use. Lead-acid makers advise stopping at about half charge to protect cycle life, while LiFePO4 (lithium iron phosphate) batteries are rated for much deeper discharge. That one difference reshuffles the ranking, so here are both measures side by side.
Battery (Renogy US list price, Oct 27, 2026) | Price | Nominal energy | Rated depth of discharge | Usable energy | Price per nominal kWh | Price per usable kWh |
12V 100Ah Deep Cycle AGM (lead-acid) | $208.99 | 1,200 Wh | 50% | 600 Wh | About $174 | About $348 |
12.8V 100Ah LiFePO4 (Core Mini) | $307.99 | 1,280 Wh | 80% | 1,024 Wh | About $241 | About $301 |
Here's the math. The AGM holds 12V x 100Ah, or 1,200 Wh. Using half of that leaves 600 Wh, so $208.99 divided by 0.6 kWh comes to about $348. The LiFePO4 holds 12.8V x 100Ah, or 1,280 Wh. At 80% you can use 1,024 Wh, and $307.99 divided by 1.024 kWh is about $301.
These are estimates built on each maker's own ratings. Renogy's AGM spec lists 500 cycles at 50% DOD, and its FAQ says not to discharge the battery below 50%. The Core Mini is rated for 5,000 cycles at 80% DOD. Any quote you compare should state how depth of discharge for solar batteries was assumed, because it changes the usable number.
Same usable energy, bare batteries only
A single battery won't carry a home for long, so scale up. Here's roughly what 5 kWh of usable storage costs in bare batteries at the same 1-pack list prices.
Target: about 5 kWh usable | Batteries needed (rounded up) | Usable energy | Battery cost (1-pack price) |
AGM 12V 100Ah | 9 (5 kWh / 0.6 kWh = 8.3) | 5.4 kWh | $1,880.91 |
LiFePO4 12.8V 100Ah | 5 (5 kWh / 1.024 kWh = 4.9) | 5.12 kWh | $1,539.95 |
Treat this table as an estimate and a floor, not a quote. A real bank has to match your system voltage. On a 48V system, these 12V batteries go in strings of four, so the count rounds up in fours: 12 AGM batteries (about $2,508) or 8 LiFePO4 batteries (about $2,464). Renogy allows its AGM in series with up to four batteries in parallel, and lists a 4S4P limit (16 batteries) for the Core Mini. Sales and multi-pack deals also move these numbers, so check prices the day you buy.
Batteries are only part of the bill, though. A bare bank can't power a single outlet in your house until a few more parts join it.
What the Battery Price Leaves Out: The Full Budget for a DIY Bank
A stack of batteries stores DC energy, and that's all it does. To run 120V or 240V home loads from solar, it also needs conversion, charge control, protection, and safe wiring. Most home setups also need an electrician and a permit. Here's the full parts list, so you can price both chemistries on the same job.
Part | Lead-acid bank | LiFePO4 bank | Complete home storage system (e.g. EcoFlow TITAN) |
Inverter (DC to 120V/240V AC) | Needed separately | Needed separately | Built in |
Solar charge controller (MPPT) | Needed, set to the lead-acid profile | Needed, set to the LiFePO4 profile | Built in (TITAN 5000: up to 4,000W; Classic: up to 3,200W) |
Battery management system | None; voltage is managed by the charger settings | Built into most LiFePO4 batteries | Built in |
Fuses, breakers, disconnects, cables | Needed | Needed | Smart Home Panel 10 for home circuits |
Space and placement | Follow the battery maker's placement and ventilation rules | Follow the maker's temperature range | Dry, ventilated indoor spot; IP20; follow EcoFlow's install guide |
Electrician, permit, inspection | Usually needed for home wiring | Usually needed for home wiring | Licensed electrician for Smart Home Panel 10 |
Prices for the extra parts are left out on purpose. Inverter, controller, and labor costs swing with system voltage, continuous watts, and where you live, so get written quotes for your exact setup.
One detail trips people up: the charge controller has to match the chemistry. Renogy, for example, tells AGM owners to pick the sealed lead-acid setting. Wiring a lead-acid battery with solar panels also means matching voltages, sizing cables, and fusing every run. Temperature matters too. Both Renogy models list a charging range of 32°F to 122°F, so a cold garage can limit winter charging.
The fairest way to judge a complete system is to put it beside a DIY bank doing the same job.
DIY Battery Bank vs a Complete Home Storage System for the Same Job
Compare on usable energy, rated output, and what the install includes, not on weight or price per cell. A bare 5 kWh bank and a 5 kWh home system are different products. One is a part, and the other includes the inverter, solar input, controls, and backup switching. So name the job first: which loads, and whether you need 120V only or 120V and 240V.
EcoFlow TITAN 5000 Classic | EcoFlow TITAN 5000 | |
Energy per unit | 5 kWh (5,017.6 Wh), expandable to 30 kWh | 5 kWh (5,017.6 Wh), expandable to 30 kWh |
Rated output | 4,000W | 7,200W |
Voltage | 120V AC only | 120V/240V split-phase |
Solar input | Up to 3,200W | Up to 4,000W |
Home circuits | Smart Home Panel 10 (120V) | Smart Home Panel 10 (240V) |
Battery chemistry / warranty | LFP / 5 years | LFP / 5 years |
Listed price on Oct 27, 2026 | From $2,499 (pre-launch listing) | From $3,199 (pre-launch listing) |
Don't divide these prices by kWh and line them up against the bare-battery totals above. Each EcoFlow TITAN price covers a 5 kWh LFP battery with a built-in inverter and solar charge controller. Smart Home Panel 10 and installation are extra, and early-bird reservations run through November 2, 2026, so confirm the live price before you budget. Across brands, home battery system costs and benefits depend on installation, incentives, and how often your power goes out.
Two EcoFlow TITAN models fit the same job a DIY bank would, split by whether your home needs 240V. Both start at 5 kWh of LFP storage and grow to 30 kWh with add-on batteries. Neither one replaces a lead-acid battery in place or plugs into an existing bank. Connecting home circuits takes the matching Smart Home Panel 10 and a licensed electrician.
EcoFlow TITAN 5000 Classic supports 120V output only, which suits fridges, lights, Wi-Fi, and small appliances. If your backup list includes 240V appliances such as central AC or an electric water heater, you'll need EcoFlow TITAN 5000 or EcoFlow TITAN 5000 Plus instead.
Up-front price is one number. How long each battery lasts decides what it really costs.
Lifetime Cost: Price per kWh Delivered
Another way to compare is to divide the price by all the energy a battery is rated to deliver over its cycle life. Here's that math for the same two batteries, as an estimate under each maker's test conditions.
Battery | Rated cycles | Energy per cycle | Rated lifetime energy | Price per kWh delivered (estimate) |
Renogy 12V 100Ah AGM | 500 at 50% DoD | 600 Wh | 300 kWh | About $0.70 |
Renogy 12.8V 100Ah LiFePO4 | 5,000 at 80% DoD (to 80% end of life) | 1,024 Wh | 5,120 kWh | About $0.06 |
The AGM works out to $208.99 divided by 300 kWh, or about $0.70 per kWh. The LiFePO4 comes to $307.99 divided by 5,120 kWh, or about $0.06. That's battery cost only. It ignores inverter losses, temperature, and every extra part listed above. The LiFePO4 rating also runs until capacity fades to 80%, so the energy it actually delivers will be a bit lower.
Cycle ratings are lab numbers, not promises. Heat, cold, charge rate, and how deep you discharge all shift real results. Any estimate of how long a solar battery lasts should start with the cycle rating, then adjust for your climate and daily use.
One more line on the budget has changed since 2025: the federal tax credit.
Solar Battery Tax Credits in 2026
The federal Residential Clean Energy Credit covered battery storage of at least 3 kWh installed from 2023 through 2025. The IRS now states plainly that the credit "is not available for any property placed in service after December 31, 2025." That's the key rule for anyone pricing a battery this year.
Timing follows installation, not purchase. The IRS says you claim the credit for the tax year the property is installed. So a battery installed in 2025 goes on your 2025 return, filed in 2026, and a battery installed in 2026 doesn't qualify. Homeowners who finished a 2025 install can still claim the federal solar tax credit on IRS Form 5695 with that return.
State and utility programs are a separate question, and their rules vary widely. The DSIRE database, run by the NC Clean Energy Technology Center at N.C. State University, lists programs by state. Check the program's own page for current amounts.
Conclusion
Lead-acid wins on sticker price per battery. But at Renogy's own list prices, LiFePO4 costs less per usable kWh and far less per kWh delivered over its rated life. So price by usable kWh, add every system part, and compare a DIY bank and a complete system on the same job. For 120V essentials, look at an EcoFlow TITAN 5000 Classic. Need 240V circuits? Price an EcoFlow TITAN 5000, each with Smart Home Panel 10 and an electrician's quote.
FAQs
Is lead-acid cheaper than lithium for solar?
Per battery, yes. Per usable kWh, not always. Renogy's AGM works out to about $348 per usable kWh and its LiFePO4 to about $301, using each maker's rated depth of discharge.
How much usable energy does a lead-acid battery give?
About half its rated capacity. Renogy recommends not discharging its AGM battery below 50%, so a 12V 100Ah battery gives about 600 Wh for regular use.
Can I replace my lead-acid batteries with a home battery system?
Not as a drop-in swap. A complete system such as EcoFlow TITAN has its own inverter and connects to home circuits through Smart Home Panel 10, installed by a licensed electrician.
How long do lithium and lead-acid solar batteries last?
It depends on cycles, not just years. Renogy rates its AGM at 500 cycles at 50% depth of discharge and its LiFePO4 at 5,000 cycles at 80%. Real life depends on use and temperature.
Can I still get the federal tax credit for a solar battery?
Not for a battery installed in 2026. IRS.gov says the Residential Clean Energy Credit is not available for property placed in service after December 31, 2025.
For press requests or interview opportunities, reach out to our media team
media.na@ecoflow.com