Review my solar quote

What a solar quote is actually telling you

A quote is a sales document, and like any sales document it is arranged to be persuasive rather than comparable. Two quotes for the same house can differ by a factor of two and both be reasonable, because they are quietly proposing different systems: different battery chemistry, different autonomy, different inverter architecture, different assumptions about what you will run and when.

The work of reading one is therefore mostly translation. What is the array in watts, the battery in usable kilowatt-hours rather than nameplate, the inverter in continuous and surge watts, and what has been assumed about your daily consumption? Until those four numbers are extracted, comparing prices is comparing nothing.

The second translation is scope. Does the price include mounting, wiring, conduit, overcurrent protection, disconnects, permits, inspection, and commissioning, or are some of those listed as allowances, excluded, or simply absent? Off grid, the balance of system and the labor are a large share of the total, and the gap between quotes is frequently a gap in scope rather than in equipment.

The omissions that cost the most

Overcurrent protection and disconnects sized properly for a large battery bank are not optional and are not cheap, and their absence from a line-item list is worth asking about directly. So is grounding and bonding, which is a code requirement, a safety matter, and a common casualty of price pressure.

Monitoring is another. A system without a shunt-based state-of-charge monitor is a system you have to guess at, and guessing at a battery bank is how banks are shortened. It is inexpensive relative to what it protects.

Then look for what has been assumed rather than specified: the daily energy figure the design is built on, the days of autonomy, the worst-month sun hours used, and whether the array was sized on an annual average. An array sized on annual average sun is not wrong exactly; it is a design that will be short in the darkest month unless a generator is part of the plan, and if a generator is part of the plan it should appear in the quote with its fuel budget.

Finally, check what happens after installation: who commissions the system, who configures the charge parameters for the specific battery, what documentation you receive, and what the support arrangement is when something faults in February.

Judging whether the price is fair

Prices vary enormously by region, by component quality, and by how much labor is in the job, so a single national benchmark is not much use. What is useful is the ratio: dollars per watt of array, dollars per usable kilowatt-hour of storage, and dollars per continuous watt of inverter, each compared against what the components themselves cost.

The price index on this site tracks market ranges, and the spec tables list what manufacturers publish for the specific models quoted, including the price per unit where a current price is known. Between them you can usually establish what share of the quote is equipment and what share is labor, overhead, and margin, which is the conversation worth having.

A high price is not automatically a bad deal. Rural installation carries real costs: travel, small crews, long days, and the fact that a quality installer who will still be answering the phone in five years is worth more than a cheap one who will not. What matters is knowing what you are paying for rather than discovering it later.

Questions worth asking before you sign

What daily energy figure is this design built on, and what happens if my actual use is a third higher? What worst-month sun figure was used? How many days of autonomy does the battery give at the depth of discharge you expect me to use routinely?

What is included and what is an allowance? Who pulls permits and who deals with the inspector? What is the schedule, and what happens to the price if the schedule slips into winter? Who configures the charge settings for this battery, and will I get them in writing?

What is the warranty on each component, and who administers a claim, the installer or the manufacturer? What is the support arrangement after commissioning, and what does a callout cost? Can I see a system you installed three or more years ago, and may I speak to that owner?

That last question is the most informative one on the list, and the answer to it tells you a great deal regardless of what it is.

Using this alongside the rest of the site

If you are still sizing the system rather than buying it, start with the system planner, which produces a coherent design from one set of inputs and shows its assumptions. Arriving at a quotation with your own numbers changes the conversation entirely, because the installer is then arguing with a design rather than guessing at your intentions.

If a quote is already in hand, read it against the spec tables for the components named, the price index for what the market is doing, and lesson five for the reasoning behind the battery and inverter choices. Lesson six covers the protection and wiring items that are easiest to leave out of a price and hardest to add later.

And treat any review here, automated or otherwise, as a second opinion that makes you a better-informed customer rather than as a verdict. It has not seen your roof, your shading, your service panel, or your local code, and it does not know the installer.

Comparing two quotes properly

Set them side by side and normalize before comparing. Write down, for each: array watts, battery usable kilowatt-hours at the depth of discharge the design assumes, inverter continuous and surge watts, days of autonomy, and the daily energy figure the design was built on. Two quotes that looked forty percent apart frequently turn out to be proposing systems of different sizes, and once normalized the price gap often narrows or reverses.

Then compare scope line by line. Racking, wiring, conduit, overcurrent protection, disconnects, grounding, monitoring, permits, inspection, commissioning, and documentation either appear in both or they do not, and the cheaper quote is often cheaper precisely because several of them are missing. Ask directly rather than assuming: an installer who left something out will usually say so plainly when asked.

Look at the equipment itself in the spec tables. A battery quoted at a given nameplate capacity may be a very different proposition from another at the same nameplate once cycle life, usable depth, and cold-charging behavior are compared, and an inverter with a high idle draw costs you energy every day for as long as you own it.

Finally, weigh the things that are not on either page: how long each installer has been working, whether they service what they sell, how far away they are when something faults in winter, and whether an owner of a system they installed three years ago would have them back. Off grid, that last consideration is frequently worth more than the price difference.

Contracts, deposits, and the paperwork after the handshake

Read what you are signing with the same care you gave the design. A quote becomes a contract when accepted, and the items that matter are the payment schedule, what triggers each stage, what happens if the schedule slips, and who carries the risk if a permit or an inspection is delayed.

Be cautious about large deposits before any equipment is ordered, and ask what the deposit secures. A reasonable arrangement ties payments to milestones, with a final portion held until the system is commissioned and documented. Ask what documentation you receive at handover: as-built wiring, the settings actually programmed into the controller and inverter, serial numbers, and warranty registrations.

Confirm who is responsible for permits and inspections where they apply, and who deals with the inspector if something is queried. Confirm insurance and licensing, because a rural installation that damages a building is a claim somebody has to carry.

Then file everything with the rest of the property record. The systems binder exists for this, and the day a component fails inside its warranty period is the day you will be glad the serial numbers and the receipts are in one place.