How to compare solar equipment prices without getting fooled by the sticker.

Why does the sticker price mislead?

A sticker price tells you what one listing costs. It does not tell you how much you get for that money. Solar gear comes in many sizes, so two prices can hide very different amounts of power or storage.

Here is an example with made-up numbers, not real listings. Panel 1 is a 200 W panel for $150. Panel 2 is a 400 W panel for $240. Panel 1 is cheaper at checkout.

Now divide each price by the watts. Panel 1 costs $150 ÷ 200 W = $0.75 per watt. Panel 2 costs $240 ÷ 400 W = $0.60 per watt. The pricier panel gives you more rated power for each dollar.

That does not make Panel 2 the right choice. It may be too big for your roof, van, or boat. The math only answers the price question, and it answers it fairly.

The sticker can fool you the other way too. A low price may be for a smaller size, an older version, a used unit, or one panel out of a pack. It may also be an offer that adds a large shipping charge at checkout. Each section below covers one of those traps.

The four measures, at a glance.

Solar Gear Scout uses four measures. Each one matches how that kind of product is rated. Two put the price on top of the fraction, so a lower number is better. Two put the product on top, so a higher number is better.

You can work every one of these by hand with a phone calculator. The sections below show how, with worked examples. All example numbers are made up for teaching. They are not real products or real prices.

Solar panels: what does each watt cost?

Solar panels are sold by their rated power in watts. Cost per watt tells you how much you pay for each rated watt. It lets a big panel and a small panel stand side by side.

Example A (illustrative): one 400 W panel for $200. $200 ÷ 400 W = $0.50 per watt.

Example B (illustrative): a pack of four 100 W panels for $280. Total watts are 4 × 100 W = 400 W. Then $280 ÷ 400 W = $0.70 per watt, or $70 per panel.

The step people skip is the panel count. If you divide the four-pack price by one panel's 100 W, you get $2.80 per watt. That is four times too high, and it makes a fair offer look terrible.

Rated watts come from a standard lab test. They let you compare panels on equal terms, but they are not a promise of what a panel will make on your roof. Heat, shade, angle, and weather all affect real output.

Also compare like with like. Rigid and flexible panels, or panels of very different sizes, often solve different problems. A lower cost per watt matters most when both panels could do the same job for you.

The table below is live. It is re-checked whenever this page loads, and it lists the solar panels with the lowest cost per watt right now.

For a longer walk-through with a freight example, read the solar panel price per watt guide, or browse all solar panels.

Portable power stations: how much battery per dollar?

A portable power station is a battery, a charger, an inverter, and a set of outlets in one box. Its size is shown as battery capacity in watt-hours (Wh). Watt-hours per dollar asks how much stored energy you get for each dollar you spend.

Example C (illustrative): a 1,000 Wh unit for $500. 1,000 ÷ 500 = 2.0 Wh per dollar.

Example D (illustrative): a 2,000 Wh unit for $900. 2,000 ÷ 900 = about 2.22 Wh per dollar.

Example D gives more battery for each dollar. Example C costs $400 less and may be smaller and easier to carry. Which one is better depends on what you need to run and for how long.

This measure is just the flip side of cost per kWh. Example C is 1,000 Wh, which is 1 kWh, so it costs $500 ÷ 1 = $500 per kWh. Both views describe the same price. Wh per dollar simply reads as "how much do I get," which is how most people shop for these units.

Watt-hours measure storage only. They do not tell you how many watts the outlets can deliver at once, how fast the unit recharges, or which ports it has. Check those on the spec sheet before you decide.

The table below is live. It is re-checked whenever this page loads, and it lists the power stations with the most watt-hours per dollar right now.

You can browse every tracked unit on the power stations page.

Home batteries: what does a kilowatt-hour of storage cost?

Larger batteries for homes, cabins, RVs, and off-grid setups are usually described in kilowatt-hours (kWh). One kilowatt-hour is 1,000 watt-hours. For these, dollars per kWh is the common yardstick.

Example E (illustrative): a 5 kWh battery for $1,600. $1,600 ÷ 5 = $320 per kWh.

Some listings give volts and amp-hours instead of watt-hours. Multiply them to get watt-hours: volts × amp-hours = watt-hours. Then divide by 1,000 to get kWh.

Example F (illustrative): a 48 V, 100 Ah battery. 48 × 100 = 4,800 Wh, which is 4.8 kWh. At $1,440, the math is $1,440 ÷ 4.8 = $300 per kWh.

Watch what the price covers. A listing for a cabinet or a set of several modules must be divided by the total kWh of everything in the box, not by one module.

A lower $/kWh means cheaper storage for each unit of energy. It does not tell you whether the battery works with your inverter, how long it lasts, or how much of its capacity you can use. Those questions come later in this guide. Browse tracked models on the batteries page.

Inverters: how many watts per dollar?

An inverter turns DC power from batteries or panels into the AC power most household devices use. Watts per dollar asks how much continuous AC output you get for each dollar. Higher is better.

Example G (illustrative): a 3,000 W inverter for $600. 3,000 ÷ 600 = 5.0 W per dollar.

Example H (illustrative): a 5,000 W inverter for $1,250. 5,000 ÷ 1,250 = 4.0 W per dollar.

Use the continuous rating for this math. Many listings also show a surge or peak number, which is a short burst the inverter can handle for a moment. If you use surge watts for one listing and continuous watts for another, the comparison is not fair.

Inverters differ a lot beyond raw watts. Some have a solar charge controller or a battery charger built in, and some do not. A unit with more built in may show fewer watts per dollar and still cost less than buying those parts separately. So compare inverters that do the same job.

Watts per dollar is a shopping tool, not a design rule. A working system also needs the right battery voltage, wiring, protection, and often a licensed installer. Browse tracked models on the inverters page.

Item price or delivered price: which one counts?

The item price is what the listing shows. The delivered price is the item price plus shipping and any required fees to get it to your door. Tax depends on where you live, so check it at checkout.

Shipping can flip the winner. Here are three made-up offers for the same 400 W panel, sent to the same address.

On item price alone, Offer 3 looks best and Offer 1 beats Offer 2. Delivered, Offer 2 beats Offer 1 by $30. Offer 3 cannot be ranked on delivered price at all until someone gets a real shipping quote.

Why unknown shipping stays unknown. Solar Gear Scout never guesses a shipping cost. If a store does not show shipping for an offer, the site shows it as unknown. It does not treat it as free, and it does not fill in an estimate. A $0 guess would make that offer look better than it may be. Any other guess would be a made-up number dressed up as a fact.

What should you do with an unknown? Get a real quote for your address before you buy. Large panels and heavy batteries may ship by freight truck, and that can bring extra fees for things like liftgate or home delivery. Ask exactly what the quote includes.

Pack sizes and minimum orders.

Solar gear is often sold in packs, and some sellers set a minimum order. Both can make a price look better than it is for you.

Pack sizes. Bring every offer to the same basis. Either divide the pack price by the number of units to get a unit price, or use the total watts or watt-hours for the whole pack. Example B above shows how.

Minimum orders. Example J (illustrative): a seller lists a 400 W panel at $0.45 per watt, which is $180 per panel. The minimum order is 10 panels. That means 4,000 W and $1,800 up front.

Now say you only need two panels. A store that sells single panels at $200 each would cost you $400. The bulk offer has the lower cost per watt, but it only helps if you truly need that many panels.

Pallet and bulk offers can also come with freight, pickup, or business-address rules. Read the terms before you put a bulk price next to a single-unit price. Solar Gear Scout does its pack and minimum-order math in code, the same way every time, so a bulk price is not mixed up with a single-unit one.

Are the two listings really the same product?

Good math on the wrong product is still wrong. Before you compare two prices, make sure both listings are for the exact same thing. Check three things.

• Same model. Match the model number or the maker's part number, not just the name. Names that look alike can be different versions or generations. Barcodes such as a UPC or GTIN help when a listing gives them.
• Same option. One model can come in several setups. Check the capacity or wattage, the voltage, and whether the price includes extras such as an add-on battery, cables, or a bundled panel. A bundle and a standalone unit are not the same offer.
• Same region. A version built for another country may have different outlets or ratings. It may not carry the same warranty or support where you live.

If you cannot confirm a match, do not force the comparison. Keep the two listings apart until you can. Solar Gear Scout only compares offers it has matched to the same exact product, with the same option and the same region.

New, refurbished, or open box?

New, refurbished, open-box, and used items should not share one comparison, even with the same model number. They are different purchases.

Example K (illustrative): the same 1,000 Wh power station is $500 new and $400 refurbished. New gives 1,000 ÷ 500 = 2.0 Wh per dollar. Refurbished gives 1,000 ÷ 400 = 2.5 Wh per dollar.

The refurbished offer wins the ratio, but you are buying something different. It may have a shorter warranty, a battery that has seen some use, or stricter return terms.

Before you buy a non-new item, ask a few questions. Who did the refurbishing: the maker, the store, or someone else? What warranty comes with it? Was the battery tested or replaced? Can you return it, and for how long? "Open box" can mean anything from never used to returned after use, so read the listing notes.

When you write down prices, put the condition next to each one. That small label prevents a lot of confused comparisons later.

How old is that price?

Prices change. Sales end, stock runs out, and a price you saw last month may be gone. An old price can mislead in two ways. It can make a product look cheaper than it is now, or it can hide a better deal that started since.

• Note the date you saw each price.
• Check again right before you buy.
• Treat a sale price as temporary unless the store says otherwise.
• Check stock too. A low price on an item you cannot order today does not help you today.

Screenshots and saved notes are useful history, but they are not current offers. The live tables on this page are re-checked whenever the page loads. Even so, the store's own checkout page is the final word on price, stock, and shipping.

Nominal or usable: how much of the battery can you use?

Battery listings usually show a nominal, or rated, capacity. The energy you can actually get out may be lower. Some batteries hold part of their charge back to protect the cells. Some energy is also lost as heat when power is converted, for example from DC to AC.

This guide does not give you a number to subtract, because it varies by product and by how you use it. Instead, look for answers on the spec sheet or in the manual:

• Does the maker list usable capacity separately from rated capacity?
• Does it state a depth of discharge, meaning how much of the battery is meant to be used?
• Does it give an AC output efficiency or an expected runtime for a stated load?
• Is the rated capacity for the battery cells, or for what comes out of the outlets?

The fair rule is to compare on the same basis. If one listing gives usable kWh and another gives nominal kWh, the ratio is not a fair match. When you do the math yourself, write down which basis you used.

What a single ratio can't show you.

Cost per watt and watt-hours per dollar are price tools. Several things that matter a lot never show up in them. Here are three to check every time.

Warranty. Look at the length, what it covers, and who handles claims. Check whether you must register the product, and whether the warranty moves to a new owner. Two products with the same ratio can have very different support behind them.

Cycle life. A cycle is one full charge and discharge. Makers often rate a battery for a number of cycles before its capacity drops to a set level. Check what that level is, because two cycle ratings measured to different end points are not the same claim. The battery lifetime value tool can help you weigh price against rated life.

Connectors and fit. Ports, plugs, solar input connectors, and voltage or current limits decide whether parts work together. A cheap panel that does not suit your power station's solar input is not a deal. Adapters and extra cables add cost too. The compatibility checker and the solar recharge estimator can help with these questions.

Weight, size, noise, and how easy the unit is to use also matter, depending on where it will live. A ratio will never tell you whether you can lift it into your truck.

How Solar Gear Scout builds its value rank.

The value rank on Solar Gear Scout follows the same steps this guide teaches, done in code so the result is the same every time.

1. Match exact products. Offers from different stores are grouped only when they are the same model, the same option, and the same region.
2. Take the best current price. For each matched product, the rank uses the best current price among its offers.
3. Apply one formula per category. Deterministic math turns that price and the product's spec into cost per watt, watt-hours per dollar, dollars per kWh, or watts per dollar.
4. Sort by that number. Products are ordered by the result, and nothing else.

Some store links on the site are affiliate links, which can earn Solar Gear Scout a commission. Affiliate links never change a product's rank or its place in any list. Shipping that is not known stays marked as unknown and is never guessed.

A rank is built from current prices, so a product with no current price has nothing to rank on. It also only reflects the one question its formula asks.

What the rank cannot tell you:

• Whether the product fits your system, space, or power needs.
• How it will perform in your weather and use.
• How reliable it is, or how good the store's service is.
• What the whole project costs, including wire, mounts, labor, and permits.
• Your tax, or a shipping cost the store has not shown.

The rank answers the price question carefully. The fit question is still yours to answer.

A checklist to follow before you buy.

1. Name the job. Write down what you need to power, and for how long.
2. Pick the right size range. Choose the watts, watt-hours, or kWh that fit that job.
3. Match the exact product. Confirm model or part number, option, and region.
4. Use the right measure. $/W for panels, Wh/$ for power stations, $/kWh for home batteries, W/$ for inverters.
5. Count every unit. Divide pack prices by total watts or watt-hours, not one unit's rating.
6. Check the minimum order. Make sure you would actually buy that many.
7. Find the delivered price. Add known shipping and fees. Keep unknown shipping unknown and ask for a quote.
8. Label the condition. Keep new, refurbished, open-box, and used apart.
9. Check the date and stock. Re-check the price and availability right before you order.
10. Read the fine print. Compare warranty, cycle rating, usable capacity, and connectors.
11. Check the fit. Confirm the parts work together and suit your space.
12. Decide from the full picture. The best ratio is a strong clue, not an order to buy.

Common mistakes to avoid.

• Comparing sticker prices across sizes. A cheaper item can cost more for each watt or watt-hour.
• Dividing a pack price by one unit. This makes a fair pack price look far too high.
• Treating unknown shipping as free. Unknown is not zero.
• Mixing surge and continuous watts. Use continuous watts for every inverter you compare.
• Mixing nominal and usable capacity. Use one basis for every battery you compare.
• Ignoring the minimum order. A bulk price only helps if you need the bulk.
• Trusting an old price. Re-check before you buy.
• Comparing a refurbished price to a new one. Different condition, different purchase.
• Letting one ratio decide everything. Fit, warranty, and connectors can matter more.

Related tools and pages.

• Compare products side by side
• Battery lifetime value tool
• Compatibility checker
• Solar recharge estimator
• Portable power stations
• Solar panels
• Batteries
• Inverters
• Solar panel price per watt guide

Solar equipment price comparison FAQ.