Second hand solar battery price, and what sets it
There's no fixed second hand solar battery price for a model, because every battery has had a different working life. How much yours can still hold matters most, then how hard it has worked.
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Used solar battery price
We don't publish a price list. One figure per model would be wrong for most of the batteries it covered, because no two have been used the same way.
A model name tells us what a battery held when it was new. It can't tell us what's left after years of filling up on sunny days and running down every evening.
Sell My Solar buys GivEnergy kit and Tesla Powerwalls. We price the battery you actually have, and the figure reaches you by email as a written offer.
You have 7 days to accept it. If you don't want it, there's nothing you need to do.
How much it still holds, then how hard it has worked
Every battery holds a little less as the years go by. What's left of its first capacity is its state of health. It's the best guide to what the next owner gets.
How hard it has worked comes second. A battery filled and emptied every day has done far more work than one that mostly sat full as a backup, even at the same age.
What a GivEnergy battery is judged on
Health and cycles head the list, ahead of the other four.
State of health
The battery management system records how much of its original capacity is left. For most packs it's the figure that matters most.
Cycle count
A high count is fine if the pack's health is good.
Generation and size
A 9.5 kWh Gen 3 pack is worth more than a 2.6 Gen 1. The rating label tells us which you have.
Cell balance
How closely the cells match. If they're far apart, the pack needs work before anyone can use it again.
A matched set
Packs of one generation that have run together are more useful to the next owner than odd ones.
Where it's been fitted
A garage or a loft is kinder than an outside wall. If the terminals or casing are weathered, say so on the form.
We weigh all six in every GivEnergy battery price we work out.
The remote check reads the health and the cycle count straight from a working pack.
The GivEnergy batteries we most want are the 9.5 kWh packs, both the Gen 2 and the Gen 3.
Judging a Powerwall from its app
We work out a Tesla Powerwall's figure from its model, from how much use the app shows it has had, and from where it's fitted.
Before we collect one, you send us four Tesla app screenshots, with a clear photo of every unit's label.
Tesla's guide to the app's energy data shows how to switch the Powerwall graph to Lifetime. That view shows how hard a Powerwall has worked. The home screen shows whether the app is raising an alert.
Checking the figure ahead of collection
Once you have your written offer, a working GivEnergy battery goes through the remote check, and we hold its readings up against the form.
For a Powerwall, we compare your screenshots with the form.
If what we see, or the kit on the day, doesn't match your description, we may send you a new offer, or withdraw ours. A new offer is yours to accept or turn down, at no cost.
If everything matches on collection day, we send the payment by bank transfer before we leave.
What to put on the form
You don't need the health or cycle figures to ask for an offer. List every unit you're selling, and photograph the label on each so we can read the model.
The form also takes "Not sure" for the model, and the photo settles it.
Say which units ran together as one system, and roughly when it went in, if you know.
For a Powerwall, you can send the screenshots with the form, or reply to our email with them later.
A figure for your own battery
The same form works whichever make you're selling, and we email you a written offer.
How much is a used solar battery worth?
We don't publish a price list, so there's no figure here. A used battery is worth what's left in it to the next owner. That comes down to how much it still holds, how hard it has worked, which model it is and where it has been fitted. Send us the form and your written offer follows by email.
Please don't take it off the wall yourself
A low-voltage GivEnergy pack runs at 51.2 V DC with real fault current behind it. A high-voltage stack runs well above that, and an All in One at around 307 V. Our engineer isolates the system before anything is moved. If your installer has already disconnected it, say so on the form.
Your written offer
Free collection, mainland England and Wales · Disconnection included · Written offer, no obligation · Reply within 48 hours
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Used solar battery value
Does a battery's age set its value?
Less than you'd think. A newer model usually starts higher, but two batteries of the same age can be worth very different amounts, depending on how hard each has worked and how well it has kept its capacity.
Is a matched set of batteries worth more?
Usually, yes. Packs of one generation that have run together are more useful to the next owner than odd ones. Put every unit on the form, so one offer covers the set.
Does where a battery was fitted change its value?
It can. A battery kept in a garage or a loft has had an easier life than one on an outside wall in the sun and rain. If the casing or the connections are weathered, say so on the form.
How do you check a used battery's health before you buy it?
For a working GivEnergy battery, we read its figures ourselves once you've had your written offer. You run a small app on a computer that's on your system's network, and a state-of-charge calibration started from our side reads each cell, the state of health and the cycle count. A Tesla Powerwall has no remote check, so we rely on screenshots from your Tesla app, which show how it has been used and whether the app is showing an alert.
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