How to

[Skypilot579]

How can I calculate how long 135kwh will last at 15.8A discharge 13v
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[retirede]

Figure the power by multiplying volts times amps. Convert to KW. Divide the battery capacity by the result.
Presume this is all DC? No conversion losses?

 

[Jraef]

Assuming this is a battery, so DC where power factor is not an issue, 15.8A x 13V = 205.4W (0.2054kW).
Assuming a continuous draw at that level, 135kWh / .2054kW = 657 hours and 15 minutes, just under 4 weeks.

135kWh is a VERY large battery... that's the equivalent of 225 average car batteries! Are you sure it is not 135Wh?

 

[ggunn]

135kWh is a VERY large battery... that's the equivalent of 225 average car batteries! Are you sure it is not 135Wh?

This. The first battery backup solar project (an unmitigated disaster) I ever saw featured a battery which was, as best I can remember, a 40kWh 48V lead acid battery (from a forklift, maybe?). It weighed something like 3000 pounds.

 

[Fred B]

Assuming this is a battery, so DC where power factor is not an issue, 15.8A x 13V = 205.4W (0.2054kW).
Assuming a continuous draw at that level, 135kWh / .2054kW = 657 hours and 15 minutes, just under 4 weeks.

135kWh is a VERY large battery... that's the equivalent of 225 average car batteries! Are you sure it is not 135Wh?

We have one upstate here that boasts 20MW (part of a utility level ESS) More than several Large C- Containers full of battery capacity.
For perspective: A typical Power Wall will have about 13.5kWh. Some estimates are that the ave. U.S. household will use about 29kWh per day.
NY plans to have 6000MW of capacity by 2030.

 

[ggunn]

A typical Power Wall will have about 13.5kWh.

I know of a couple of installations where there are (10) Powerwalls, but their output isn't 13V DC.