This article was generated with AI assistance from cited sources and has not been individually reviewed by an editor.
A C&I storage tender is where projects are won or lost on the fine print, not the headline price. The three things that quietly decide whether a system delivers — warranty exclusions, performance guarantees and grid-connection responsibility — are usually buried in the last pages.
BessCare’s Tender Check Pro tool exists to read the fine print before you commit. This guide explains the checks that matter most, so you can apply the same scrutiny whether or not you use the tool.
Separate three different promises that vendors often blur together. A product warranty covers the hardware against defects. A performance guarantee covers how much usable capacity or energy the system will still deliver after N years of cycling. A service commitment covers how fast someone shows up when it fails. These are not the same thing, and a strong product warranty does not make a weak performance guarantee acceptable.
Check the degradation curve. A 10-year performance guarantee that assumes no annual capacity loss is not a guarantee — it is marketing. Ask what the guaranteed retained capacity is at year 5 and year 10, and what happens if the system falls short (replacement cells, cash compensation, or nothing).
In several European markets — Germany, Italy and the UK among them — grid connection is now the main constraint on storage deployment. Queues are oversubscribed and ‘first-come, first-served’ rules are being reformed toward readiness-based selection. A tender that quietly leaves connection responsibility with you, while quoting an optimistic connection timeline, is transferring the single biggest schedule risk onto your balance sheet.
Ask: who applies for the connection, who bears the cost of reinforcement if the local grid is congested, and what happens to the contract if connection is delayed by a year?
Read the O&M clause against real failure modes. Does it cover inverter replacement, cell balancing, software updates and remote monitoring, or only “defects in materials and workmanship”? Does it guarantee a response time, and is that response time defined in hours, days, or “reasonable efforts”? In C&I storage, downtime during a demand peak can erase months of savings in a single afternoon, so response-time commitments matter more than they do in residential.
Check what happens if the system underperforms or the vendor exits the market. Can you replace the integrator without voiding the warranty? Is the monitoring software a subscription that locks you in? A tender you cannot exit cleanly is a tender you should not sign without legal review.
BessCare’s method is public and our scores are never for sale.
