Head-to-head test
Goal Zero Yeti PRO 4000 vs Goal Zero Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000)
Goal Zero Yeti PRO 4000 vs Goal Zero Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000): Buy the Yeti PRO 4000 on its own. Every spec that determines how these two behave is identical: 3,600W continuous, 7,200W surge, 3,000W solar, 15ms transfer, 4,000 cycles, five years of warranty.
Full profiles: Goal Zero Yeti PRO 4000 → · Goal Zero Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000) →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
$3,999.95 · direct from Goal Zero
Last checked 1 day ago. Prices move — check before you buy.
Goal Zero
Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000)
6,834Power Score · The AC & Fridge Zone
$5,998.95 · direct from Goal Zero
Last checked 1 day ago. Prices move — check before you buy.
Spec deltas
The PRO 8000 is not a different power station. It's the Yeti PRO 4000 with a Tank PRO 4000 expansion battery already bolted on, which is why the two spec sheets agree on everything except capacity, price, and weight. Same 3,600W inverter. Same 7,200W surge ceiling. Same 3,000W solar input, same 100W USB-C, same 15ms transfer, same 4,000 cycles, same five-year warranty.
So the usual comparison moves don't apply here. There's no faster-charging one, and no one that starts a load the other refuses. What separates them is $1,999, which is $5,999 against $4,000, and it buys exactly one thing: a second 3,994Wh of battery.
Take the base unit. Five of the six load profiles below finish on 3,994Wh with room in hand, the base accepts expansion batteries later, and money spent on capacity you never drain is money spent on nothing. The one person who should skip straight to the PRO 8000 is the one whose ordinary day already runs past 3,994Wh, and that person usually knows it before they land here.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
cost / lifetime kWh
That discount is real and it is entirely conditional. Nineteen cents only exists if you push all 31,952 kWh through the bank, which means 4,000 full drains of 7,988Wh. Weekend Camping asks for 2,100Wh, or 31% of the bigger bank. Energy you never pull is the most expensive energy on this page, because you bought it and got nothing back.
Yeti PRO 4000 alone: $4,000 for 3,994Wh, or $1.00 per WhYeti PRO 4000 + Tank: $5,999 for 7,988Wh, or $0.75 per WhLifetime cost works out to $0.19 per kWh for the pair against $0.25 for the base unit, priced across 4,000 cycles
Why it mattersIf your loads only half-drain the base unit, the cheaper per-kWh rate is a rate you never actually earn.
Capacity
That collapses the whole matchup to one variable: hours. The bigger system doesn't run your well pump if the smaller one won't, it runs the same equipment for twice as long. There is no feature on either side to weigh against the price, which is unusual and clarifying.
Both units: 3,600W continuous and 7,200W surgeBoth units: 3,000W max solar, 100W USB-C, 15ms transfer, 4,000 cycles, five-year warrantyCapacity is the only spec that moves: 3,994Wh against 7,988Wh
Why it mattersAnyone shopping this pair on inverter strength, backup switchover, or charge speed is shopping a difference that does not exist.
Adding roughly 80 lbs of battery (195.95 lbs against 115.7) to cover an outing that consumes a fifth of what you already owned is backwards. The Tank earns its weight in a basement or a van bay where it gets sited once and forgotten. In a truck bed it's freight.
Base unit: 115.7 lbsPRO 8000: 195.95 lbsTailgate Party needs 670Wh, or 20% of the base unit; Weekend Camping needs 2,100Wh, or 62%
Why it mattersIf the unit is ever going to leave the house, buy the base.
That makes the two options wildly asymmetric. Buy the base, discover you needed more, and you add the battery. Buy the bundle, discover your real day is a 2,100Wh weekend, and there's no way to hand the Tank back and get your money returned. One of those mistakes is correctable and the other is a line item you live with.
Both units are expandable, and the base accepts Goal Zero expansion batteries without being replacedThe two listings differ by $1,999Van Life Daily needs 4,685Wh, or 138% of the base unit's usable capacity, the only profile it can't finish
Why it mattersUnless you have already measured a day past 3,994Wh, take the reversible option.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: The base unit finishes five of six load profiles with capacity to spare; only Van Life Daily's 4,685Wh breaks it, at 138% of usable capacity.
Weekend camping, an eight-hour blackout, a remote workday, a tailgate: the base unit closes all four with capacity still in the tank. The PRO 8000's win in each of those rows is a win on headroom, not on finishing. The engine calls them for the bigger bank because 24% used beats 48% used, and that's the right call, but a night that ends at 48% still ended.
Van Life Daily is the exception, and it isn't close. 4,685Wh a day puts the base pack at 138% of usable capacity, which is a polite way of saying you go dark before dinner, then do it again tomorrow. The PRO 8000 spends 69% on the same day and starts the next morning with just under a third of the bank in reserve. That one row is what the second battery is for. If it describes your life, stop reading and buy it. If it doesn't, nothing else on this page justifies $1,999.
Growth Path
Selected because: Both units expand, so the $1,999 second battery is a purchase you can make today or make later, and that timing is the entire decision.
Neither of these is a dead end, which quietly settles the argument. The Yeti PRO 4000 takes Goal Zero expansion batteries without being replaced, so the PRO 8000 configuration stays on the table at any point after checkout. You aren't choosing between a small system and a big one. You're choosing when to pay for the big one.
That asymmetry is worth more than any spec on the page. A season of real use tells you your actual daily draw better than any load table, this one included, and if it comes back over 3,994Wh you buy the Tank then, with evidence in hand. Reviewers put the platform ceiling at four Tank PRO 4000 batteries and 20 kWhB1, so even the ambitious version of your future is reachable from the base unit. The thing you can't do is un-buy a battery.
Lifetime Value
Selected because: $0.19 per lifetime kWh against $0.25 looks decisive until you notice the cheaper rate requires draining a 7,988Wh bank 4,000 times.
cost / lifetime kWh
Nineteen cents a kilowatt-hour against twenty-five. The bigger bank really is cheaper per unit of energy, for a boring and honest reason: the second battery works out to roughly $0.50 per watt-hour ($1,999 divided by 3,994Wh), half the $1.00 per Wh the base unit charges for its first pack. Bulk pricing works here the way it works at the warehouse store.
The catch is what the rate quietly assumes. Both figures are amortized across 4,000 cycles, and for the PRO 8000 that means running 31,952 kWh through it before the math pays off. Priced per year of warranty instead, the numbers run the other direction: $1,200 against $800, because the coverage is five years on both no matter how much battery sits behind it. Bulk pricing only pays if you take delivery of the bulk.
Portability & Form Factor
Selected because: 115.7 lbs against 195.95 lbs, and only one of these is a single object you can plan a weekend around.
weight
115.7 lbs is where this starts, and that's already a two-person lift with a plan attachedA1. The PRO 8000 lands at 195.95, so the Tank accounts for roughly 80 lbs of separate box you also have to site. The one mercy is that it is a separate box. Nobody is asked to lift 196 lbs at once, which is more than you can say for a single-chassis unit of that size.
Two heavy objects are still two heavy objects, and they change what the system is. The base unit is something a fit pair can wrestle into an RV bay or a truck bed on a Friday afternoon. The PRO 8000 is equipment you install. Work out which of those you're actually buying before the freight shows up, because that answer is hard to reverse in a garage.
Strengths & trade-offs
Goal Zero Yeti PRO 4000
Strengths
- +Costs $1,999 less
- +Lighter by 80.2 lb
Trade-offs
- –Very heavy unit that may be difficult for one person to lift.
Goal Zero Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000)
Strengths
- +Larger battery capacity
Trade-offs
- –Substantially more expensive (+$1,999) than the Yeti PRO 4000.
- –Significantly heavier (+80.2 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
Will It Power Your Gear?
Scenario math and per-appliance runtimes, modeled from the spec record.
Scenario verdicts
We ran the math on six real-world scenarios. Here's which unit survives your actual life.
SCN-01 · 2 nights · needs 2,100Wh
Weekend Camping
Two nights off-grid with essential comfort
Neither unit
Scoring these two at a campsite is a category error: neither travels — the Yeti PRO 4000 is 115.7 lbs and the Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000) 196 lbs, and at those weights they roll off a truck bed if they go anywhere at all. The 2,100Wh here is trivial for either — it's the going that doesn't happen. If you need power away from the building, you're shopping the wrong class.
Battery budget usedlower = more headroom
LOAD Phone Charger 15W×6h · LED Lights 40W×8h · Box Fan 75W×14h · CPAP Machine 40W×16h
SCN-02 · 8 hours · needs 1,645Wh
8-Hour Blackout
Keep the essentials running through a night without power
Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000)
1,645Wh over eight hours puts the base unit at 48% and the PRO 8000 at 24%, so the bigger bank takes this one on headroom, and headroom is exactly what you want when an outage runs past the length in its name. Worth knowing what 48% means, though: the base unit has roughly another eight hours in it at the same draw. The second battery isn't buying you tonight. It's buying you the second night.
Battery budget usedlower = more headroom
LOAD Fridge 150W×8h · Router + Modem 20W×8h · LED Lights (4 bulbs) 40W×6h · Phone Charger 15W×3h
SCN-03 · 8 hours · needs 320Wh
CPAP Overnight
Sleep therapy without interruption — the #1 medical use case
Either unit
A CPAP pulls 320Wh a night, which is 9% of the base unit and 5% of the PRO 8000. Call it eleven nights on one and twenty on the other before either sees a plug, and if your outage runs twenty nights the CPAP is not your leading problem. Nothing here separates them, so break the tie the way you'd break any tie: take the one that costs less and weighs less, because the machine on the nightstand cannot tell the difference.
Battery budget usedlower = more headroom
LOAD CPAP Machine 40W×8h
SCN-04 · 8 hours · needs 910Wh
Remote Workday
Full work day off-grid without power anxiety
Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000)
The Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000) clears the workday at 13% used, banking 5,880Wh — late work, extra calls, or a second laptop charge without arithmetic. The Yeti PRO 4000 at 27% also finishes, with 2,485Wh of slack for the unplanned.
Battery budget usedlower = more headroom
LOAD Laptop 60W×8h · External Monitor 30W×8h · Router + Modem 20W×8h · Phone Charger 15W×2h
SCN-05 · 4 hours · needs 670Wh
Tailgate Party
Game day power for the crew
Neither unit
Scoring these two at a tailgate is a category error: neither travels — the Yeti PRO 4000 is 115.7 lbs and the Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000) 196 lbs, and at those weights they roll off a truck bed if they go anywhere at all. The 670Wh here is trivial for either — it's the going that doesn't happen. If you need power away from the building, you're shopping the wrong class.
Battery budget usedlower = more headroom
LOAD Blender 400W×0.5h · LED TV (55") 80W×4h · Bluetooth Speaker 15W×4h · Phone Charger (×3) 45W×2h
SCN-06 · 24 hours · needs 4,685Wh
Van Life Daily
A full day of mobile living — the ultimate endurance test
Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000)
4,685Wh a day is the line where the base pack stops being enough. 138% of usable capacity means you're dark before the day ends, and then you do it again tomorrow. The PRO 8000 covers the identical day on 69% and wakes up with just under a third of the bank still there, which is the margin you want when the forecast turns grey. This is the one profile on the page that pays for the second battery, and for the person actually living it, it pays for it outright.
Battery budget usedlower = more headroom
LOAD Mini-Fridge 150W×24h · Laptop 60W×4h · Phone Charger 15W×3h · LED Lights 40W×5h · Fan 75W×8h
The Load Test
RUNTIME = (Wh × 0.85) ÷ LOAD
None of the scenarios above exactly yours? Build it. Toggle what you'd plug in; both units are tested against the combined draw.
Essentials
Comfort & Convenience
High-Draw Appliances
Test duration
8h
Continuous draw
205W
Projected runtime
For this load: Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000) runs 33.1h vs 16.6h.
$5,998.95 list · direct from Goal Zero
Modeled from the spec record — same math as the tables below. Methodology
Runtime by appliance
Real-world runtime estimates for common appliances, modeled at 85% inverter efficiency.¹
Essentials
The basics you need runningscale 0–452.7hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–90.5hHigh-Draw Appliances
These reveal the real limitsscale 0–6.8h¹ Runtime = (capacity × 0.85) ÷ appliance watts. Within each group, all bars share one time scale (the group's longest runtime), so lengths are comparable across appliances; identical runtimes collapse into a single blue/orange bar. Actual runtime varies with battery age, temperature, and simultaneous loads — see methodology.
Conclusion
August 2, 2026
Verdict: the Yeti PRO 4000
Buy the Yeti PRO 4000 on its own. Every spec that determines how these two behave is identical: 3,600W continuous, 7,200W surge, 3,000W solar, 15ms transfer, 4,000 cycles, five years of warranty. What the extra money buys is duration and weight, and five of the six load profiles on this page finish on the base pack with capacity left over. Only the 4,685Wh van-life day breaks it, at 138% of usable capacity. The base unit also accepts Goal Zero expansion batteries later without being replaced, so buying small forecloses nothing: run a season, watch your real draw, and add the Tank in month six if the numbers demand it. Pre-pay the $1,999 only if you already know your ordinary day runs past 3,994Wh.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of August 2, 2026. The links below open Goal Zero's current price.
$3,999.95 · direct from Goal Zero
Last checked 1 day ago. Prices move — check before you buy.
or check the Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000) price$5,998.95 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated August 2, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): RV Living, Solar Generator.
Full specifications
ᵈ Derived: price ÷ rated capacity. See the data behind our comparisons →
Comparison ToolAdd more power stations, side by sideOpen Tool →How these numbers are produced
Numeric verification
Every figure on this page traces to our spec database or arithmetic on it — no estimated numbers.
Owner claims
Statements about owner experience are cited to published reviews — see Sources & Research Notes below.
Runtime model
Runtime = (rated capacity × 0.85 inverter efficiency) ÷ device wattage. Solar recharge estimates assume panels deliver 70% of rated output. Cold weather, battery age, and stacked loads reduce real-world results.
Power Score
Computed from 14 published spec dimensions, weighted per use-case bench. Higher is better; a unit must meet a bench's minimum threshold to be rated.
See the full weight table and data sourcing on our methodology page →Class ranking (the star rating)
Each unit's star score is a category ranking, not customer reviews — no buyer opinions feed it. We score every station on size-independent quality (value, output, portability, endurance, ports, warranty, and more), then percentile-rank it against the other units in its capacity class, so a class-leading compact unit and a class-leading whole-home unit can both earn 5★. Here, Yeti PRO 4000 rates 3.6/5 (20th percentile of 16 Home Backup-class units), and Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000) rates 3.4/5 (4th percentile of 29 Whole-Home / Off-Grid-class units).
How the class ranking is computed →Test Notes & Caveats
Hidden gotchas and advantages we spotted that you won't find on the product page.
Neither of these is carried
The base unit is a bent-knees, two-people, not-on-the-basement-stairs lift, and the PRO 8000 is that lift plus a second one for the Tank. Measure the doorway and choose the spot before it ships. Wherever it lands on delivery day is where it lives.
Warranty: No Difference
Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here. Worth saying because the per-dollar framing can suggest otherwise: the Yeti PRO 4000 works out at 1.3 years of cover per $1,000 spent against the Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000)'s 0.8, but that spread is the price gap, not the terms.
Full record above — the Test Desk pick is the Yeti PRO 4000.
Check Yeti PRO 4000 price →or check the Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000) priceOwnership Analysis
What happens after you buy — true cost of ownership, brand trust, and growth potential.
Lifetime value
Service lifeyears at one full cycle per day
Lifetime energy delivered
Cost per delivered kWh
│ warranty ends · Reaching the cycle rating means ~80% capacity remains — degraded, not dead.
Analyst note
The Yeti PRO 4000 is cheaper to buy, but the Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000) is cheaper to own. At $0.19/kWh over its lifetime vs $0.25/kWh, the Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000)'s higher cycle life and capacity make each dollar go further over the years. One thing to know reading the table: both carry the same 4,000-cycle rating, so the lifetime rows are sticker price and capacity in disguise — the wear horizon is identical and decides nothing here.
Growth path
Yeti PRO 4000
EXPANDABLESupports Goal Zero expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 3,994Wh.
Accepts up to 3,000W of solar. Enough for a serious multi-panel array.
Generous port selection supports complex multi-device setups.
Expansion batteries are Goal Zero-specific. You're investing in the Goal Zero ecosystem.
Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000)
EXPANDABLESupports Goal Zero expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 7,988Wh.
Accepts up to 3,000W of solar. Enough for a serious multi-panel array.
Generous port selection supports complex multi-device setups.
Expansion batteries are Goal Zero-specific. You're investing in the Goal Zero ecosystem.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Both expand, so neither locks you out of growth — decide on capacity, price, and the rest, not the expansion checkbox.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
Goal Zero Yeti PRO 4000
Field reports on the base unit split along a familiar line. Reviewers rate the build among the most durable they've handled, with American-based support and an app that worksA1, and the 3,000W solar input drew consistent praise for taking the pack from empty to full in under two hours off-gridA2. Capacity gets specific mention as RV and camping backupA4.
The caveat is reliability, and it isn't a small one. Owners report 12V errors, including a first unit returned or replaced and a replacement that threw a 12V error and then wouldn't charge from solarA3. Whether that's a bad batch or something structural isn't answerable from what's been publishedA3, but it's the category of failure that only announces itself on the day you needed the unit.
“Weighs about 115.7 lbs — a two-person unit to move — with one of the most durable builds reviewers have seen, backed by American-based support and a great app.”
Sources
bestgeneratorsolar.com · thesolarlab.com · goalzero.com · business.walmart.co · techradar.com · cleantechnica.com
Goal Zero Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000)
The PRO 8000's evidence is the base unit's evidence plus a battery, because that's what it is. Professional reviewers rate the expandable system highly and describe it as built to last, with the road to four Tank batteries and 20 kWh as the headlineB1, and the Tank's own cells are a newer LiFePO4 generation rated for a longer life than the expansion batteries that came before itB4.
Two caveats ride along. Owner reports are mixed in the same way the base unit's are: one owner's unit didn't work the first time they lost power and genuinely needed it, and some describe it as still carrying bugs, though the reviewers who tested it never hit those problemsB3. And the 3,000W figure behind the fast refill requires Goal Zero's own panels and combiner box, which are an expensive prerequisiteB2. A reviewer with a week and an owner with a year are different instruments, and the gap between the two readings is the most useful thing in this ledger.
“A strong expandable system — you can add up to four Tank PRO 4000 batteries for up to 20 kWh; professional reviewers call it a high-powered, highly reliable power station built to last.”
Sources
batteryskills.com · techradar.com · goalzero.com · bestgeneratorsolar.com · business.walmart.co · thesolarlab.com
Sources & Research Notes
Every owner claim in this report is traceable to a published source. The bracketed references above resolve here.
Recurring owner themes
- Strong solar input, a great app, American-based support, and a durable build are the praise; heavy weight and some owner reliability reports (12V errors) are the caveats. [Yeti PRO 4000 · 3 entries]
- Praised for large expandability (to 20 kWh) and fast solar recharge; caveats are mixed owner reliability reports and a max solar rate locked behind proprietary Goal Zero hardware. [Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000) · 3 entries]
- A1
“Weighs about 115.7 lbs — a two-person unit to move — with one of the most durable builds reviewers have seen, backed by American-based support and a great app.”
bestgeneratorsolar.com / thesolarlab.com — Yeti PRO 4000 review · 2026 · [mixed]
- A2
“3,000W solar input recharges 0-100% in under 2 hours off-grid, with impressive surge and idle efficiency; fully expandable.”
goalzero.com / thesolarlab.com — Yeti PRO 4000 review · 2026 · [positive]
- A3
“Owner reliability is mixed — some report 12V errors, including a first unit returned or replaced and a second that had a 12V error and would not charge from solar.”
business.walmart.com reviews / oliver owner forums — Yeti PRO 4000 · 2026 · [negative]
- A4
“Roughly 3,994Wh capacity; praised for RV and camping backup.”
techradar.com / cleantechnica.com — Yeti PRO 4000 review · 2026 · [positive]
- B1
“A strong expandable system — you can add up to four Tank PRO 4000 batteries for up to 20 kWh; professional reviewers call it a high-powered, highly reliable power station built to last.”
batteryskills.com / techradar.com — Yeti PRO 4000 review · 2026 · [positive]
- B2
“Accepts up to 3,000W of solar input, but reaching that ceiling needs Goal Zero's own expensive proprietary panels and combiner box. Note the widely quoted "0% to 100% in under 2 hours" figure describes the standalone PRO 4000; with the Tank attached the system holds roughly twice the energy, so a full refill takes correspondingly longer.”
goalzero.com / bestgeneratorsolar.com — Yeti PRO 4000 review · 2026 · [mixed]
- B3
“Owner reviews are mixed on reliability — one owner's Yeti 4000 didn't work the first time they lost power and really needed it, and some report it's still riddled with bugs, though professional reviewers didn't experience those issues.”
business.walmart.com reviews / thesolarlab.com — Yeti PRO 4000 owner reviews · 2026 · [negative]
- B4
“The Tank PRO 4000 expansion batteries use improved LiFePO4 tech rated for a much longer lifespan than the previous generation of expansion batteries.”
goalzero.com — Tank PRO 4000 expansion battery · 2026 · [positive]
Research compiled August 2, 2026.
Who Should Buy Which
Buy the Yeti PRO 4000 if you…
- →You're buying backup for a house or an RV and your worst realistic night is a fridge, some lights, and a laptop. An eight-hour outage costs the base unit 48% of its usable capacity and it still has the second night in it.
- →The unit is going to move. Truck bed, RV bay, cabin, job site and back. 115.7 lbs is already the ceiling of what two people handle cheerfullyA1, and nothing above it gets easier.
- →You haven't metered your actual daily draw yet. Buy the base, run it hard for a season, and let the meter decide whether the second battery is worth $1,999.
- →You want the platform without paying for the platform's ceiling today. Expansion stays available later, which makes the base unit the low-regret entry point.
Buy the Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000) if you…
- →You live in the thing. A 4,685Wh day is 138% of the base pack and 69% of this one, and that gap repeats every single day, not once a season.
- →The system gets installed once and never moves again: a basement, a van's battery bay, a shop wall. Weight stops mattering the moment the last strap is tightened.
- →You already know your numbers. If you've metered a routine day past 3,994Wh, the second battery is the cheapest capacity on this page at about $0.50 per watt-hour ($1,999 divided by 3,994Wh), and there's no reason to wait for a lesson you've already learned.
This is you — check the Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000) price
If neither fits
If you wanted something you could carry, close the tab. 115.7 lbs is the floor here, and a buyer whose real need is phones, a fan, and a laptop should be looking at a mid-size station at a fraction of the price. Same answer for anyone with equipment that can't tolerate an interruption: both of these transfer in 15ms, and 15ms is a brief but real gap in the power, so gear that needs genuinely uninterrupted supply wants a dedicated online UPS rather than either of these.
The Bottom Line
Buy the Yeti PRO 4000. Everything that decides how these two behave is the same part in the same chassis: the inverter, the surge ceiling, the solar input, the transfer time, the cycle rating, the warranty. The gap between them buys duration and about 80 lbs, and five of six load profiles never ask for the duration.
The reason to start small isn't that the Tank is a bad battery. Per watt-hour it's the cheapest capacity on this page. The reason is that adding it later costs you a delay while adding it now costs you $1,999 you may never draw, and only one of those two mistakes can be undone. Buy the base, run it through a real season, and let your own meter make the call. If it comes back over 3,994Wh, the Tank will still be there waiting.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the Tank PRO 4000 worth the extra $1,999?
Only if a routine day for you runs past 3,994Wh. Across the six load profiles here, the base unit finishes five of them with capacity to spare; the exception is the 4,685Wh van-life day, which puts it at 138% of usable capacity. If that pattern isn't yours, the money buys energy you won't draw.
Can I add the Tank later, or do I have to buy the PRO 8000 bundle up front?
Later is fine. The Yeti PRO 4000 accepts Goal Zero expansion batteries without being replaced, and reviewers put the ceiling at four Tank PRO 4000 batteries and 20 kWh. That's the single strongest argument for starting with the base unit: nothing about the larger configuration is foreclosed by buying small first.
Does the Yeti PRO 8000 run bigger appliances than the PRO 4000?
No. Both are 3,600W continuous and 7,200W surge, on the same inverter. If a compressor's startup surge trips one, it trips the other. The Tank changes how long you can run things, not what you can run.
How long does the Yeti PRO 8000 take to recharge from solar?
Both cap at 3,000W of solar input, so the bigger bank takes about twice as long. 7,988Wh divided by 3,000W is roughly two and a half hours of full-rate sun, against about an hour and a half for the base unit's 3,994Wh. Full rate assumes Goal Zero's own panels and combiner box, which are an added expense, and real charging tapers as the pack fills.
Can either one back up my house like a UPS?
Both switch from grid to battery in 15ms, the same figure on the same hardware, so backup behavior gives you no reason to pick one over the other. That covers ordinary household gear. It is not zero, so anything that truly cannot survive a brief interruption needs a dedicated online UPS regardless of which of these you buy.
Related comparisons
Where to buy
Goal Zero Yeti PRO 4000Pick
$3,999.95
$3,999.95 · direct from Goal Zero
Last checked 1 day ago. Prices move — check before you buy.
Goal Zero Yeti PRO 4000 + Tank PRO 4000 (Yeti PRO 8000)
$5,998.95
$5,998.95 · direct from Goal Zero
Last checked 1 day ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.