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True, there are better prices by now. But 5kWh? I thought my smartphone would have that by now... Perhaps 200kWh is a bit exaggerated. And yes you also need a

True, there are better prices by now. But 5kWh? I thought my smartphone would have that by now... Perhaps 200kWh is a bit exaggerated. And yes you also need a good quality inverter for your home that synchronizes with the net, but I actually don't believe this to be expensive high tech... Ideally I wouldn't want to put the energy I generate with solar, wind or differently back into the power net. In my country you basically give that away for free. There are reasons for that, but the most efficient way would be to use the energy yourself as much as possible. Sure, 5kWH is enough to soften peaks and there could already be huge benefit to this. But a bit more capacity would be really nice to really safe the energy of sunny days. Reminds me if disappointing USPs that let me play Tetris for an additional 7-8 minutes before I feel like civilization has broken down completely until power comes back.

vbezhenar 4y ago
Phone battery is something like 4V. Watts depend on voltage. I guess home batteries use other voltage so their watt actually provides more electricity.
- raxxorraxor 4y ago
  No, Watts should be independent of voltage, it is the product of voltage and ampere (don't know the exact English terms here). You perhaps mean ampere hours, I think that is often used for phones. But it is only ever meaningful if you have the respective fixed voltage and it often make sense for a batteries to quickly calculate how long they should last if you know how much ampere a device draws. It could also become a sensible metric if we always talk about 120V/240V for general household appliances of course.
  - thehappypm 4y ago
    I think what they’re talking about is the amp-hour measure of battery capacity, which is common in electronics, but converting to actual energy requires knowing the voltage.
  - beckingz 4y ago
    Voltage isn't fixed across a discharge cycle. As a chemical battery discharges, the voltage drops, so at the same load in amps you get less watts later.
  - raxxorraxor 4y ago
    edit: Wh is independent of voltage I mean... of course a product is dependent on its factors...
    - vbezhenar 4y ago
      You're right, I mangled Ah and Wh in my head, sorry. 4V 1Wh battery and 24V 1Wh batteries are equally useful. Your numbers are a little bit off though. I just googled some power bank (which is supposedly better than smartphone). It claims to provide 20 000 mAh at 5V. So it's 20 Ah at 5V or 100 Wh. I think most smartphones are around 10-20 Wh. Far from 5 kWh. But this discrepancy was already noted in other comments.
pjc50 4y ago
Phones are more like 10-15 watt-hours, not kWh.

vbezhenar 4y ago

Phone battery is something like 4V. Watts depend on voltage. I guess home batteries use other voltage so their watt actually provides more electricity.

raxxorraxor 4y ago
No, Watts should be independent of voltage, it is the product of voltage and ampere (don't know the exact English terms here). You perhaps mean ampere hours, I think that is often used for phones. But it is only ever meaningful if you have the respective fixed voltage and it often make sense for a batteries to quickly calculate how long they should last if you know how much ampere a device draws. It could also become a sensible metric if we always talk about 120V/240V for general household appliances of course.
- thehappypm 4y ago
  I think what they’re talking about is the amp-hour measure of battery capacity, which is common in electronics, but converting to actual energy requires knowing the voltage.
- beckingz 4y ago
  Voltage isn't fixed across a discharge cycle. As a chemical battery discharges, the voltage drops, so at the same load in amps you get less watts later.
- raxxorraxor 4y ago
  edit: Wh is independent of voltage I mean... of course a product is dependent on its factors...
  - vbezhenar 4y ago
    You're right, I mangled Ah and Wh in my head, sorry. 4V 1Wh battery and 24V 1Wh batteries are equally useful. Your numbers are a little bit off though. I just googled some power bank (which is supposedly better than smartphone). It claims to provide 20 000 mAh at 5V. So it's 20 Ah at 5V or 100 Wh. I think most smartphones are around 10-20 Wh. Far from 5 kWh. But this discrepancy was already noted in other comments.

pjc50 4y ago

Phones are more like 10-15 watt-hours, not kWh.