3 ms·

I have a new all-electric home and a p.v. system with lithium storage, ALSO living in a sunny place (French Alps of the south, in altitude) I'm FAR from being a

by kkfx 4y ago

I have a new all-electric home and a p.v. system with lithium storage, ALSO living in a sunny place (French Alps of the south, in altitude) I'm FAR from being autonomous. But really far. If I want to go fully autonomous I have to spend in batteries like the same price of a Lamborghini, for zero re-sale value, to be demolished in 10 years in theory, in practice more likely 7-8 years if I use them with significant daily important DOD. I also doubt we are even able to produce enough battery and panels to everyone. And I'm not alone: https://www.economie.gouv.fr/files/files/directions_services/cge/stockage_electricite.pdf https://www.economie.gouv.fr/files/files/directions_services... essentially the governmental, non-interested report state: we can't run on renewable. That's is. What I'm curious is another thing: why some on a technically sound community like HN with certain topics became totally partisan of this or that topic at fanatic levels. It's not you, it's a trend I see in the last months at least, for various topics: anytime there is a post with a neoliberal agenda hot topic such behaviors appear. My honest review: - I spent a very big amount of money to build a new home, witch will not pay back ever in monetary terms, only pay back in comfort terms; - I spent more for renewables NOT because they are ecological (they are pollutant) but as a protection against future disruption I imaging we will suffer, again in economical terms money dumped to the bin; - I'll spend more in the near future for an BEV because I expect diesel/gasoline supply issues and artificially skyrocketed prices. The synthesis? Well: those who have done such investments will be far less wealthy then before. Those who have not done that or can't will be far poorer. Those who gain are ONLY those who push such evolution for almost pure financial reasons, not "green" at all in ecological terms, green just in dollar and stereotypical toxic waist terms. Since it's clearly NOT sustainable nor extendable on scale the obvious results will be a very big disaster and another global war.

rasz 4y ago
>If I want to go fully autonomous I have to spend in batteries like the same price of a Lamborghini how? considering 75 kwh tesla is ~50K. Do you really need more than 75 kwh of storage?
- kkfx 4y ago
  To be autonomous? Seeing the actual meteo I need something like 40kWp p.v., 10k liter of hot water as a reserve, subdivided in 500l batch to being able to re-heat only some reservoirs depending on the meteo, around 400kWh storage since to make it last I should not normally go more than 85-90% SOC every day. Did you ever try the real autonomy game? Just consider that in winter you can count on few hours of Sun let's say one day yes and one no, if you live like me in France south. In those hours you need to run anything together. You have postponed dishwasher, washing machine, you have to cook, heat both sanitary water and reserve for night and early morning home heating, recharge the batteries, car's battery included etc. For instance to heat enough water to heat my home a single day (~2000 liters at 60℃ to get in the morning at 32-33℃) I need a powerful heat pump, let's say 3kW absorbed. I need ~2kW per home appliance (dishwasher, washing machine, coffee maker, induction for a single pot etc) I might have good enough Sun from 9.30 in the morning to let's say 14.30. Some appliance are very quick (like a coffee maker) but some are not (the dishwasher heat water few times for 8-10' a time over 90' timeframe, the washing machine normally only one time) recharging a massive battery demand both a certain amount of sustained power to avoid unbalanced cells, demand little power for a not that short time to balance them at the end of the charge etc. Essentially I need around 25kW for around 4+ hours per day. Being able to count casually passing clouds in the meantime. Not only. Such system need to be constantly managed to lower quickly and mount quickly the load following p.v. production. Some appliance can potentially and practically (for instance modern heat-pump water heaters are already made to be controlled by some modbus/mqtt automation), some can just potentially (nothing on sale do that, but it's possible), some can't. Really try the game, including home heating in winter, NOT counting on the grid even for small loads.

by kkfx 4y ago

rasz 4y ago

>If I want to go fully autonomous I have to spend in batteries like the same price of a Lamborghini how? considering 75 kwh tesla is ~50K. Do you really need more than 75 kwh of storage?

kkfx 4y ago
To be autonomous? Seeing the actual meteo I need something like 40kWp p.v., 10k liter of hot water as a reserve, subdivided in 500l batch to being able to re-heat only some reservoirs depending on the meteo, around 400kWh storage since to make it last I should not normally go more than 85-90% SOC every day. Did you ever try the real autonomy game? Just consider that in winter you can count on few hours of Sun let's say one day yes and one no, if you live like me in France south. In those hours you need to run anything together. You have postponed dishwasher, washing machine, you have to cook, heat both sanitary water and reserve for night and early morning home heating, recharge the batteries, car's battery included etc. For instance to heat enough water to heat my home a single day (~2000 liters at 60℃ to get in the morning at 32-33℃) I need a powerful heat pump, let's say 3kW absorbed. I need ~2kW per home appliance (dishwasher, washing machine, coffee maker, induction for a single pot etc) I might have good enough Sun from 9.30 in the morning to let's say 14.30. Some appliance are very quick (like a coffee maker) but some are not (the dishwasher heat water few times for 8-10' a time over 90' timeframe, the washing machine normally only one time) recharging a massive battery demand both a certain amount of sustained power to avoid unbalanced cells, demand little power for a not that short time to balance them at the end of the charge etc. Essentially I need around 25kW for around 4+ hours per day. Being able to count casually passing clouds in the meantime. Not only. Such system need to be constantly managed to lower quickly and mount quickly the load following p.v. production. Some appliance can potentially and practically (for instance modern heat-pump water heaters are already made to be controlled by some modbus/mqtt automation), some can just potentially (nothing on sale do that, but it's possible), some can't. Really try the game, including home heating in winter, NOT counting on the grid even for small loads.