Battery Load Options and Performance
It is important to note that, unlike other mini-subs, a Hyper-Sub can recharge its batteries many times during a single deployment. Therefore, a Hyper-Sub's TOTAL submerged range is considerably higher than the distances indicated below, which are based on a single battery charge cycle.
A Hyper-Sub can recharge its batteries as many times as needed during a deployment. This is only limited by the amount of fuel it carries and how the fuel is allotted.
The chart above provides a PER DIVE / PER RECHARGE performance comparison of different battery loads. As shown, a variety of battery payloads are available for final outfitting (or future up-fitting) of a Hyper-Sub.
As a standard, HSP Tech recommends the 22.8kWh AGM battery load. The AGM batteries are low tech but are very durable and recharge at a much faster rate than lithium batteries. They are also less expensive to replace.
In some instances however a customer might prefer higher battery loads if they require higher rates of underwater speeds for longer periods of time, in which case, the standard 22.8kWh AGM battery load can be exchanged with a lithium battery counterpart.
As a rule of thumb, lithium battery technology can easily cost approximately $10,000 USD per kWh added. For example, if a customer would prefer to add a 68kWh battery load, it could cost (approximately) an additional $680,000 USD and a 136kWh battery load would cost approximately $1,300,000 USD, depending on manufacturer.
It should also be noted that for each kWh of batteries that is installed, 11 lbs of the vessels variable payload capacity will be consumed. Therefore, in addition to the added cost of a more sophisticated lithium battery package, the impact on the Hyper-Sub's overall performance should be carefully considered prior to exchanging the standard AGM batteries for lithium batteries.
The standard Hyper-Sub battery package is 22.8kWh which will provide a user with many combined hours of useful sub-sea time. Any variation to this standard load will be priced on a separate, cost plus 20% basis.