Doubles Stored Power, Bundle Panels May Be Too Small
This expansion battery doubles the amount of power that can be stored. It is worth buying as part of a bundle, or with the bag. The solar panels included in most bundles are usually too small; a 400-watt or higher panel is recommended. A 200-watt bundle panel is not bad and would work if it could be left outside and always connected to the C2000, but that is not currently possible.
Pros
- + doubles the amount of power that can be stored
- + worth getting in a bundle or with the bag
Cons
- − bundled solar panels are usually too small
- − 200-watt panel only works if left outside and always connected
AI-assisted summary of a verified Amazon customer review.
· July 6, 2026 · United States
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Expansion battery adds runtime for overnight outages
This expansion battery connects easily to the C2000 and registers in the app immediately, arriving at around 87% charge. It was purchased after the C2000 alone ran a double-door refrigerator for 8 hours during an outage and still had 50% left, though that outage began in the daytime and would have run out around 9am the next morning. The extra capacity is intended for inconvenient outages that need to last through the night. A solar panel was also bought for additional options, but 8-hour outages are currently rare.
Pros
- + simple addition to the C2000
- + registers in the app right away
- + arrives mostly charged
- + adds runtime for overnight outages
AI-assisted summary of a verified Amazon customer review.
· June 27, 2026 · United States
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Expansion Battery Arrives Charged and Works Well
The expansion battery arrived in good condition. Both units were over 85% charged on arrival and reached full charge in under 15 minutes. The battery functions as expected and performs reliably.
Pros
- + Arrives in good condition
- + Over 85% charged on arrival
- + Fully charges in under 15 minutes
- + Works perfectly
AI-assisted summary of a verified Amazon customer review.
· June 26, 2026 · United States
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Extra battery received, works well
The additional battery was received and appears to work well. It has not been tested yet, so no performance details are available. The overall impression is positive.
AI-assisted summary of a verified Amazon customer review.
· July 17, 2026 · United States
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Doubles runtime for C2000 Gen 2, but pricey and heavy
This expansion battery only works with the Solix C2000 Gen 2 and doubles its power output. It is a simple battery pack with no outlets or display, just a power button and a charge indicator light. It connects via a heavy-duty cable and drains first, then the main unit takes over. Runtime estimates on the main unit and app are unreliable for on-and-off appliances like a fridge. Combined weight is about 80 pounds, so a hand cart is recommended. Both units recharge in about two hours. It is expensive but works well, and customer support is excellent.
Pros
- + doubles power output
- + simple to use
- + automatic switchover
- + recharges in about two hours
- + excellent customer support
Cons
- − only works with Solix C2000 Gen 2
- − no outlets or display
- − unreliable runtime estimates for on-and-off appliances
- − heavy combined weight
- − pricey
AI-assisted summary of a verified Amazon customer review.
· July 12, 2026 · United States
Read original on Amazon ↗
